Hey Guys,
I recently took a short trip 333 miles round trip. Going and coming, I was running the generator the whole time.
I have a 15KW Kubota, it was very hot out so, I had at least 3-15K Coleman AC's running.
The whole trip was on flat terrain, I have an MC9 with a 6V92. The engine is in good condition, it used hardly any oil.
I averaged 5.6 miles per gallon. I kept my speed between 58 and 65 MPH, because , frankly it wont go much faster.
That seems a little low to me. Am I right ? Or is this about what the mileage should be?
Any comments would be greatly appreciated
Thanks
Seville
Probably would have been 6.5 without the generator, which is about what you would expect, I think.
Brian
that's what I get with my 8v71, but my generator doesn't dip from the same tank.
A 15kw with a Kubota engine under that load will use 1.5 to 2.0 gph of fuel fwiw
Alright then. I guess I'm ok. Good to know. I thought that was low.
Thomas, wow I didn't know the 8V71 was that much of a fuel hog ?
Thanks guys for chiming in !
To think, I am always thinking about an engine transplant. An 8v92, a series 50 or series 60! Anything!
My 6v92 is Gutless! Especially on hills! From what I'm hearing I get pretty good mileage cause my generator pulls from the same tank as the main engine.
I guess I have to get used to life in the slow lane :)
Thanks again guys!
Im only getting 6 with my 8v-92 in a much heavier bus on flat ground here in Florida, no generator, and running average 65.
I always thought that was low but it never changes and I cant change it!
Sent from my iPhone using Tapatalk
Two years ago i added up everything and came up with this; 31,106 miles traveled, high of 8.24 mpg, low of 5.9 mpg, average overall of 7.39 mpg. This is an 8v71n with an allison 4 sp auto tranny, towing an 87 jeep that weighs about 3800 lbs. and doing almost all of those miles in the western US. More 2 lane roads than freeways. :)
I ran with the ears pinned back and towing. 8V92 39,000lbs anything over 5 was a gift. Drop to 65 could go over 6mpg. no gen set running. 5 spd Allison 4:88gears. 315 80r 22.5. 100lb air pressure mixed hills and flats. All Flats could run Close to 7mpg on a good day with ears pinned back. Known distance and filled to neck fresh engine. Bob
I average 7.82 out of my 892V set up at 445HP. That's pulling a 4600# toad on basically all flat road running 58-60MPH. Our new toad weighs in at 2800# so even if the MPG doesn't go up, I expect it to be a little spunkier. Will :)
When I first got my coach, with 8V92, I was totally empty and got as much as 10 MPG (hwy), but now that I weigh a lot more, I still get about 7.5 on the highway and 3 in the city.
Downhill, both ways !! (NOT)
I get about 9. :)
Bob I don't know how you even got 5 mpg is that a typo 4:88 gear ? you should have been running 3:36
Your prob correct: I need to check book again I might have been looking at world trans chart. It was seated coach gears which I know are lower than entertainer.. On the 98 world trans I think one is 4:88 and entertainer is 4:56 unless my memory has went south again. It was with stock seated coach Automatic Gears. Was talking about the 89 8V92. Prevost. ::) Bob
Seville -
As others have said, right in the ballpark.
IBME w/ MC-9s, with both the 8V71 and 6V92 tuned to 275 hp, that they'll average 5.5 - 6.5 overall, regardless of terrain and how heavy your right shoe is.
Do you have any idea what size injectors are in your 6V92? If it's stock, you're in the 275 hp range. Changing out the injectors and the turbo can boost the hp easily to 350, which will make a difference you'll notice. Especially once the new injectors are in and the rack's run properly.
Your coach should run 70 - 75 if it has the 3.70 rear axle, so if all it will do is 65, something's amiss.
FWIW & HTH. . .
;)
we've always gotten about 5.6 the way I drive...hard and fast...up until our recent Florida to Michigan trip this past summer when I lost some power. Coach is gutless now...and consistently getting 7.4. Think I have a fuel delivery issue. 6v92Turbo weighs almost exactly 30,000 pounds...running 110 PSI tire pressure and pulling a camry toad.
Hi Seville,
Fuel milage on my Model 20 Eagle with Series 60 automatic is:
65 mph cruise control
towing 2800 lb
7.3 mpg
running bus air (only)
towing 2800 lb
6.2 mpg
running 15kw generator (no bus air)
powering 3 rooftop ACs
6.0 mpg
I haven't checked the mileage using both AC systems simultaneously.
Thanks for all the great feedback everybody !
RJ.. I don't know what size injectors I have nor about the rear axle but will most definitely look into that.
Thanks for the tip, if I could get 350 HP, I would be one happy camper.
Gary.. I have to say a model 20 Eagle with a Series 60 sounds like a sweet rig! That must be a pleasure to drive.
So, I guess we are all in the ball park of where we should be ? However, it would be nice if I could get my 5.6 up to 7 and change.
Every little bit helps with a coach. I'm relatively light compared to a lot of you guys. I weigh in at about 30,000 lbs.
Thanks again for all the feedback ! It's real nice to post a question and get so many answers from people who really know their stuff!
Hi All, last Jan, palmdale/lancaster Edwards AFB, ca, to quartzsite, az thru palm springs up the long grade east of p.s., towing 93 wrangler hardtop, 7.4 mpg, lvmci...
Hey Guys,
You boys (and girls) are going to be sick when Hard Headed Ken returns from his vacation next week. He's going to report fuel mileage over the 12 mpg mark with the new Series 60 in his Prevost. It's equipped with a standard shift automatic - at least that's what I thought after riding in it.
I led us home from BK's get-together last week @ 65 mph on cruise. Ken later said he believes he should move on up to 70 mph for a little better fuel burn.
Speaking of fuel burn, how about the luck of Eric Brown up in S.C.? Seems he bought some $2.97 fuel when he returned home from the Nashville Eagle rally in May. He hasn't driven the Eagle since and, he's looking for a few more 5 gallon buckets. He's scheduled for the Eagle rally in Branson, Mo. come October and no way is he wasteing that good cheap fuel on such a long run. With diesel prices skyrocketing, he's draining it all out so he'll have the good cheap stuff when he returns. Anyone wishing to donate a 5 gal bucket to such a good cause, call Eric @ BR549!
All 60 series with the same hp at the same rpm will use the same amount of fuel in any application it all depends on the gearing and what you do with it a typical 60 series producing 425 hp @ 1800 rpm will use 20 gals a hour keep the rpm low for the speed and they will get you fuel mileage so will any engine
How many miles per gal of water do you use Gary sorry the devil made me do that lol
Quote from: garhawk on September 07, 2012, 07:51:07 AM
Hey Guys,
You boys (and girls) are going to be sick when Hard Headed Ken returns from his vacation next week. He's going to report fuel mileage over the 12 mpg mark with the new Series 60 in his Prevost. It's equipped with a standard shift automatic - at least that's what I thought after riding in it.
I led us home from BK's get-together last week @ 65 mph on cruise. Ken later said he believes he should move on up to 70 mph for a little better fuel burn.
It's hard for me believe what my Prodriver is telling me. I'm leaving Panama City in the morning and I'll fill up at I-10. When I left Smyrna I filled up, I leaned the bus over to the left and filled until I could see fuel in the filler neck and I will do the same tomorrow. I'll be surprised if the Prodriver's estimated fuel mileage is correct, but with my 8V92 at 6 MPG it would usually take about 1/2 tank to get here at just under 500 miles. I came a different route this time, 540 miles and I used about a needle's width over a 1/4 tank. That's much better, twice as good?? The jury is still out until tomorrow.
Ken
If going for fuel mileage Ken has the right setup you cannot do that with a Allison like a B 500 and other models of the World transmissions gearing is very important that why they need to be in the 4:00+ gearing they don't cool or lubricate at slow shaft rpms in overdrive when that happens you part with 10,000 bucks
Stupid question
Ken how did you get a prodriver to work with your 8v-92?
I've been wanting one for years but was told they only work on series 60's. Thats why I opted for the silverleaf which in reality is just a toy or something to look at because it doesnt work with my ecm unless I upgrade the chip or some bs.
Anyway, please explain if you would and do you have a good source for the PD for 8v's
Sent from my iPhone using Tapatalk
The Pro/Driver works on a 8V92 DDEC 111 but I could never get it to work on a DDEC 11 or 1 same with the SliverLeaf
Good luck
Quote from: Ace on September 07, 2012, 02:23:17 PM
Stupid question
Ken how did you get a prodriver to work with your 8v-92?
I've been wanting one for years but was told they only work on series 60's. Thats why I opted for the silverleaf which in reality is just a toy or something to look at because it doesnt work with my ecm unless I upgrade the chip or some bs.
Anyway, please explain if you would and do you have a good source for the PD for 8v's
Ace,
I didn't have a Prodriver on my 8V92, I put about 25,000 miles on the 8V92 and just divided something by something when I filled up, can't remember, I'm on vacation and drinking Margaritas. I think the stuff Clifford said is correct. There is a thread here on BCM about a software upgrade that includes a new Eprom for the DDEC II ECM, RV Safety Jim knows about it.
Ken
I have a silver leaf on my series 60. I have hecked it with my spedo, and gps. It is dead on with the speed of both. Iunning a 12.7 DDECIV, allison 6 speed double over drive, 4:10 gear,and 11R24.5 tires. At 65 mph rpms are 1360. At 70, 1450. I did some comparisons. If I set the cruise at 63 mph on the average NOT CLIFFORDS BIG HILLS!!LOL), it will average over 10 mpg. If I cruise at 70, it drops to mid 9 mpg. I have been called blind, stupid, and a liar!!LOL, but I can prove it!!! I think driving style, bus weight, and the terrain make a big differance also. The 60 series builds a ton of tourque from 1100 to 1600 rpms, which helps a lot. Gary's 20 has the same set up as mine, but with a 740 tranny, and 3:73 gear. He was maxed out at 2150 rpms at 71 mph. We changed the gear to a 3:36 and got 78 mph at 2150 rpms. A few mph, but still at the top end of the engine rpms. My bus weighs app. 42k. His is probably close to that. Tha two strokes buils thier power at the top of the rpm range, but the big six cylinder 4 strokes build at low rpms. I think running high rpms on a four stroke would be a waste except maby in a marine app.. Just my two cents!!!
Eriic hp is for racing torque for diesel engines the 60 series will make max torque at 1200 rpm max hp at 1800 rpm then the torque fall off above 1800 rpm
I agree Clifford!!! GIVE ME TOURQUE! If I want hp, I climb on the busa!!
Here's the results. The Prodriver said I used 52 gallons of fuel in 600 miles. As I was approaching I-10 this morning and looking at the fuel gauge I was thinking it's going to take about 70 gallons to fill this thing up (I've stuffed a lot of hundreds in that tank). It took 72 gallons, about 8.3 MPG, not almost 11 as the Prodriver indicated. The reason the Prodriver was off so much is my fault. I've made several modifications to the engine and the ECM Fueling table, I took a shortcut to adding fuel because I was too lazy to push about 10 extra keys and do some math. Because of my shortcut the ECM told the Prodriver I was using less fuel. Anyway, I know my mistake and I've fixed it. I'm disappointed, now it's back to the lab for more experiments.
Eric, I'm coming after you, I mean your fuel mileage of course. Even if those terrible things (I don't think all of them are true, I've seen you drive your bus and you were able to install the Series 60 in it) people have said about you being blind, stupid, and a liar are true at least 10 MPG gives me something to shoot for. To whoever says those terrible things about Eric I'm hoping for the same to be said about me sometime in the near future.
Ken
Brown will pull your leg Ken lol,he may get 10 Hal gets over 9 mpg with a 625 hp 14L series 60 with larger and heavier Eagle than Eric and Hal won't pull your leg
Somebody on here a while back claimed he was getting 13 MPG on his bus: 6 mpg going, and 7 mpg coming back!
;D
Quote from: luvrbus on September 08, 2012, 08:28:18 PM
Brown will pull your leg Ken lol,he may get 10 Hal gets over 9 mpg with a 625 hp 14L series 60 with larger and heavier Eagle than Eric and Hal won't pull your leg
Eric's my friend and he knows I'm kidding around with him. I just want everyone else to know.
My gearing is almost the same as Eric's, I'm 1400 RPM at 70 MPH. It seems you should be able to get 10 MPG with that gearing. I believe Eric, I got to get mine there.
Uncle Ned adds his city and highway together for his total MPG
Ken
If mine turns out over 7.5 I'll be happy 8+ very ;D and everything over that gravy. 60 series 10sp auto shift 4:56 gears 315 80R 22.5 tires. 430hp-470hpcruise Bob
Clifford, you have to keep in mind that Ken is running a 14l, not a 12.7. I've been called a lot of things!!LOL I always say I don't care what you call me as long as you call me at quiting time and payday!! I know I can get over 10 mpg, because like Ken, I have checked it manually. It is pretty hard to check manually. You can vary the full tank by 3-5 gal. just by stuffing a little more in the tank. I'm not going to say that it is not possible to get 12-13 mpg with a 40k rig, but I would think that you would have to check it going down hill, in netural, and not over 35 mph.!! Matter of fact I may try it!!! Bett you I will get over 15 mpg Clifford!
I don't doubt you Brown running the flat lands along the coast but the 14L has always gotten better fuel mileage than the 12.7 so I don't know why Ken is not as good as you but I bet he gets there lol he may need to add a drop box what you think
We will wait till Wayne gets his Eagle and 14L on the road he tells me he going to be 10+ also I do know the 14L will average about a mpg better in a H-45 than the 12.7
Let's not forget Boomer with his 45 ft Eagle and Cummins he is around 9 to 10 mpg he has been for years, really you are the only one I know that get that mileage with the setup so you did something right most Eagles are in the 7 to 8 mpg
good luck
I read these MPG threads every time they come up and everyone has different theories on how this works. I have tried a lot of them over the years and my tried experience is always the same. My heavy trucks loaded at 168,000 lbs running Cats which I think are the worst for fuel mileage get 4.8mpg at 69mph. If I slow them down to 55mph on cruise it will jump up to 6mpg. My light trucks loaded at 80,000lbs running Cummins (which I have had the best luck with for fuel mileage) get 7.4 at 70 mph. If I slow them down to 55mph on cruise they jump up to 8.5mpg.
I had this thread on my mind this morning when I drove to pick up my daughter from soccer camp. I drove 185 miles round trip all highway with my 09 Ford F150 (5.4 gas engine). The best the truck has ever done for me on the trip computer is 17.2mpg but I drive between 70-80 probably average 75mph. Today I set the cruise at 55 mph (felt like I was sitting still) but for the first time ever the trip computer reached 18mpg. I dont know where it would end up on a longer trip.
Reality is 55mph seems to be the magic number. The new technology has enabled us to get way better fuel mileage even at higher speeds but does not change the wind drag coefficient, atmospheric aerodynamics, and friction. On the days I want to cruise at 70mph I do, but the days I want to save fuel and count the gallons I just slow down a little and cruise. I have no idea what fuel mileage my bus is going to get, 1994 8V92TA with a world 6spd. I plan on finding out toward the end of this year when I think it will be finished but I don't have any experience with these 2 strokes so this will be a learning curve for me
Wayne, the DDEC 8v92 with a World transmission will do fine you will be in the 7 to 8 mph range at least the ones I been around do you don't see that setup often but when you do they work as good as a 60 series
anywhere around that would make my day, 8 would be fantastic
Don Fairchild did some tweaking on his 8v92 with that setup he gets around 9 towing a 1 ton Chev dually a heavy sucker
good luck
HELLO; Just finished a 3500 mile trip with the bus. Ran 60 most of the time except one stretch from evansville to chattanooga (70 + except thru cities). We are running a mechanical L10 @310hp with a B400R 6 speed computer tranny with a 4.625 rear end.. Mci 7 bus is at 36000 plus towing a saturn
Fuel mileage for one set of mileage was 3681 miles / 453.3 for 8.12 mpg. Another set all during the trip was 2819/ 360 for 7.83mpg... Any genny time is included.. We spent 12 days at non camping spots (flying J NS Wally world).
Left florida went to pittsburgh then west thru michigan, ohio, indiana, back to NC to florida. Some eastern mountain driving in west Virginia including fancy gap. i ran in 5th most of the time.
We tried the slower version of a vacation driving 200 or so miles per day on state roads @ 60 except for the IN to TN run.
THe bus ran well. Had to replace a new sams battery obtained before we left. It dropped to 10.5 volts soon after stopping each day. Replaced it in muskegan michigan sams.
Changed a starter At Bob Glines in evansville but it was acting up before i left. Turned out to be a bad bushing. I thought it was the battery but not so.
Anyway a good trip after all. We were going to ALaska but medical reasons cut that off and ended up doing a midwest tour.
Attended the back to the bricks rally in Clio michigan. had a great time; met some fine bus people . Thanks to Ed Roelle and company for a fine rally.
Many thanks to Bob Glines and Tom Mason ( white eagle) to allow us to stay and visit. We did the museum tours and the local sights . USS silversides sub and LST at muskegon MI. Also another LST at evansville IN
Regards and happy bussin mike
Wayne, does the 09 5.4 ltr ford still spit out spark plugs, like my 97 F250 5.4 does, lvmci...
Mine does'nt spit them out but they will break when attempting to remove them. I did break one last month because a coil went bad and the book suggests replacing the plug with coil. Ford even makes a tool for the spark plug removal with instructions on how to break them off properly. I heard getting the plugs changed at the dealer is a $800 bill.
Alright Clifford!! you have forced my hand!!LOL This is a pic of my silverleaf as of ten minutes ago. The figures I quoted earlier are individual trip sets. This shows the total miles, avg speed . This includes a hundred trips across town and around the block during the debug process. Three trips are included in this. Charleston, SC, Chatanooga, TN, and Nasheville, TN. The 10 mpg trip was the only one which I did not pull a trailer. It is 20' x 8.5' . We carry two harley full size touring bikes in it. During the trips taken I rest my case and leave my fate to the jury!! ;D
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Finlinethumb47.webshots.com%2F52078%2F2722583470053449967S500x500Q85.jpg&hash=48359377a06e829daa8e48e54dba50d32211e15a) (http://entertainment.webshots.com/photo/2722583470053449967dGqmdk)
I almost forgot: The Charleston trip is probably the only time I have kept it under 65mph. Most of the time I run 65-70. The bus weighs in at 41,700 lbs. The trailer is app. 6k lbs, and the bikes weigh about 1k each. When I had the 8v-71 I kept the pedal to the metal to stay above 60. Worst was 5.1 mpg, and best was 6.5.
Eric, not doubting your mileage, but I have to point out the SillverLeaf can give false fuel data. In truth, it is not SilverLeaf as such, but the information given to the VMSpc.
I have found that the mileage numbers tend to be pretty good if the DDEC ECM is set correctly for the tire size and rear end ratio. However, the fuel used is a complicated calculation based on injector calibration and pulse width for each cylinder firing. If you think of that complexity, it is mind boggling. For example, one set of the same part number injectors is slightly different from the next. In a perfect world, the ECM would be set for a new set of injectors. Next, there are three injectors firing per revolution and if the pulse width is off ever so slightly, that affects what the engine thinks it has used in fuel.
To give you a feeling, I set an odometer just for fuel. Each time I fuel up, I zero the gauge. My generator and AquaHot come off a separate tank. For my first engine, when I pulled in to fuel, the fuel used and fuel filled agreed almost every time to within a gallon or two and it bounce on each side of the VMSpc reading. My "new" engine almost always seems to read low on fuel usage on the VMSpc. On the SilverLeaf, you can program a correction, but I have not done that. Over the past 160 gallons, it looks like I could be off by 10 gallons (guess - have not had a chance to check).
I talked to Ken today when I was on the road. I gave him a hard time ;D. My trip odometer (about 160 miles) read over 10MPG and my fuel odometer (about 30 miles) read 12.6. I know that neither are correct. I have slowed down a bit on the past few trips (about 65MPH vs 68MPH) and am pulling a PT Cruiser on a dolly (as opposed to my 9K service truck) and the VMSpc shows a bit over 9MPG. While I have not spent a lot of time going over my fuel records, I suspect the real number is closer to 8.5 or a bit lower.
If your fuel used agrees with fuel filled, then your are indeed getting great mileage.
Jim
You beat me to it Jim I wasn't going to give Eric a real bad time but I know how far off the SliverLeaf and Pro/Driver can get the only true measurement monitor is the FloScan used on planes and in the marine world Davenport has one in his Eagle but they are pricey
According to my DD scholar the 12.7 will not get as good of mileage as the 14.L and the DD15 beats both so size is not a problem seems like the more L the better the mileage fwiw
Eric will have a second shot at his mileage figures. I am re-powering with exactly the same setup as him. To the letter, he has gotten all the parts for me so far, engine trans , ecm, trans computer same rear end ratio,tires.
If I don't get his mileage, he has aggreed to pay the difference in fuel !!!! ;D ;D
Jury might be out for a while, just started this project, and as Eric says "WHILE WERE AT IT"
Glad this is my only project in the works. ( when I'M done the " T " bucket and trike will be in a trailer behind ) and me and the wife are going to take on the west coast mountains!!
ED
I have checked the mpg manually also. It is pretty hard to do because with a 150 gal. capicity, it is always possible to shove in a few extra gallons!!LOL This makes i look better. I was running the generator a few times also which must be accounted for. I am sure Jim knows more about the silverleaf and its accuracy than anyone here. If it is wrong I would appreciate it if he WOULD NOT TELLL ME!!! If I don't know it I am still getting 9 mpg!!LOL
Just got back yesterday from the beach (Surfside Tx.) Averaged 5.4 running 65 on cruise and pulling ford Edge. Silver 8v92 TA with 5 speed auto. Weight slip says 42000 lbs. Haven't weighed it since i've owned it. need to, that sounds heavy. 350 mile trip.
You 60 seires guys are raising the bar. When I started my 15 I told someone I wanted to get the mileage over 10 and I heard you can't get that kind of milage with a 45 footer. Well thats all it took to tell me I can't do something. The following is a list of things I have done to my Eagle to help get over 10 MPG's. 1) remove the dropbox and replace with a T-Drive rearend. 2) used a manual trnsmission Eaton 10 speed autoshift. 3) Tires with a lower rolling resentence, 4 super singles in the rear. 4) a 14L 60 seires turned up a little. 5) a two speed fan 6) Remove all the junk from the roof ( I will still have stuff on the roof just hide it). 7) make the body as smooth as possible. 7) proper gearing ( with a T-Drive that will not be a problem. The thing that is not going to help is wieght, My Dad always told me I build things to strong. He is correct, But I have a few tricks to reduce the wieght from here on.
Wayne
Yep Wayne I told you that lol even with a EGR 14L I still think you will get close but you still have to account for the EGR fuel
Eric, look at it this way: The DDEC ECM fuel usage reporting error may be in favor a even higher mileage ;D
I wanted to make sure that folks understand that the fuel usage data is accurately recorded/reported by SilverLeaf, ProDriver, etc. The error (if any) occurs withing the DDEC ECM. As noted, it is a calculated value based on injector calibration and pulse width timing. SilverLeaf provides a calibration adjustment feature to account for a ECM reporting error if one exists.
Eric, since you have verified the mileage via the hand calculation method, I will believe your numbers ::)
I am amazed at the work Ken is doing to "modify" the data tables in his ECM. He and I talk about it and it just boggles my mind. I think he will get a handle on it and get some great results.
Jim
Are the electronic fuel mileage calculators accurate? Hand method to me is the only way to get it down. On a couple hundred gallons if you fill and miss one or two it gonna make that much difference. We didn't buy these big puppies for fuel mileage anywho! My Dad once told me to never trust someone that tells you there incredible fuel mileage. I'm happy as a peach with 5 mpg. Those ragheads overseas need to make a living too! NOT!
You can do anything you chose but a series 60 engine making the same hp, same torque at the same rpm they are going to use the same amount of fuel the 14L will do the same hp,same torque with less fuel because of the size is my understanding without the EGR
My friend at Arrow has 300 buses with Volvo,Detroit and Cummins engines the best mileage comes from his Setras with the DD13 and the T10 Allison transmission they are 9 +mpg the rest are in the low 8's fwiw he racks up more miles in a month than most converted coaches do in a year and keeps a very close watch on fuel
His are all modern day coaches design for less drag not the boxes of the past
I think with the 10-13 speed autoshift setup like Ken and Wayne are doing it will get even better. I still the trick is to keep the series 60 between 1300 and 1600 at average highway speeds. I am sure it would pull just as good a 1100 rpms according to the tourque chart. I can't do that as the 4000 series allison needs around 1250 rpms to oil properly at highway speeds. Shouldn't be a problem with the autoshift.
Eric the T10 is a 10 speed transmission Allison and a great one at that a lot better that auto shifts of the past it will just be a while before you can find one used I drove both the autoshift and T10 the auto shift is not in the same league as the T10 lol
I know some say the automatic transmissions in lockup or overdrive do not use any more energy ( fuel ) than the manual Transmissions. The 740 in my 05 while in lockup in 4th gear still puts out heat and heat is only produced by fuel. Thus I will go with an Eaton Autoshift 10 speed.
Wayne
;D I'm listening; Just hoping for around 8. Still shooting for under 40 thousand rolling. Not quiet as scientific as some of you guys ,but I do learn. Bob
Quote from: robertglines1 on September 10, 2012, 05:47:21 PM
;D I'm listening; Just hoping for around 8. Still shooting for under 40 thousand rolling. Not quiet as scientific as some of you guys ,but I do learn. Bob
Bob,
Have you run the numbers for your gearing setup? I think with a 4.56 diff and a .74 top gear you going to be kinda high in the RPM range for the best fuel mileage, plus your bottom 3 gears or so will not be very useful.
Ken
Bottom 3 are about useless . maybe pull stumps. The 4:56 is the highest of the two I had access too. The other was 4:88. So was a math thing. Should climb hills great! I'm probably a 70 mph driver most of the time on the interstate. The 4:56 is the one that actually came out of the XLE origianally and found it's way back home. Fairly sure I got the numbers correct. At the time I reasoned The entertainer coaches were higher geared and was the correct choice. This was before I really got into thinking about the numbers. Might make some future adjustments as $ allow. What gears do you suggest that will fit my case? I need to look and see again if I have A or B Eaton. I have forgotten. Bob
Bob,
I'm running a 3:36 diff, 1400 RPM at 70 MPH, .74 top gear. I think Jim's running a 3:73 diff, I think he's got the same top gear as me, maybe he will tell us his RPMs at 70. Tom C has a really good calculator for gear ratios and road speeds.
Ken
I really need to verify my numbers again! It is the ratio that came with the world trans in the XLE from prevost 1998. I thought the book said 4:56 Time to get the cobwebs out of this old brain, needs to be exercised ::) Been so tied up with details on other parts have forgotten about some details. Bob
Yes, I have 3.73 gears. That gives me 1500 at 68 MPH.
With 4.56, you would be 55 MPH at 1500 and somewhere around 77 MPH at 2100 (assuming you have tires with about 473 rev per mile like my 11 24.5).
Jim
Bob all the seated coaches had 4:56 but had the option for 4:30 with the World that year model all the entertainer shells I've seen and been around 4:30 was the standard and would haul @$# in 6th OD,the B500 they came with were 0.74 in fifth OD and 0.64 in sixth OD they would go down the down
Should be that 4:30 then. Was original rear end out of bus. I got it from Dick, who bought it out of bus before I got it. So in between the 4:56 I thought the book said and what Jim is running. I have it installed so to late to count teeth. Bob