Hey Guy's ! I am beginning to think I may be needing a turbo in the near future ! Is this somthing a Lay Person can handle ?? I know things are seldom what they seem,but looks like this is pretty strait forward once you get the air cleaner etc removed!!
Yep no biggie to change
Quote from: bigred on March 30, 2017, 12:33:09 PM
Hey Guy's ! I am beginning to think I may be needing a turbo in the near future ! Is this somthing a Lay Person can handle ?? I know things are seldom what they seem,but looks like this is pretty strait forward once you get the air cleaner etc removed!!
Yep no big deal to change one just pre soak the 4 nuts on the wye connection with PB
Good Lord!! I just looked at some prices on the internet!! What the heck are these things made of -----------GOLD??????
Quote from: bigred on March 30, 2017, 04:17:15 PMGood Lord!! I just looked at some prices on the internet!! What the heck are these things made of -----------GOLD??????
Rhet - that's not new.
Do a lot of checking. do not just run to your local Detroit dealer and slap down a credit card.
get to a good mechanic in your area. He can save you big bucks and get a good turbo.
uncle ned
Quote from: uncle ned on March 31, 2017, 01:04:02 PM
Do a lot of checking. do not just run to your local Detroit dealer and slap down a credit card.
get to a good mechanic in your area. He can save you big bucks and get a good turbo.
uncle nedYep Ned ! I plan on taking it down to David for him to check as am not savvy enough to diagnose if I have a turbo problem or not altho I have several indicators that says yes .Incidentally ,I found them on the Internet from a low of around 700 dollars to a high of like 2400 dollars !
I buy mine from turbo re-source in Havasu Az for about 700 bucks there is nothing special about a turbo on a 8v92 no waste gate to contend with
Quote from: luvrbus on March 31, 2017, 02:07:23 PM
I buy mine from www.turboesource.com (http://www.turboesource.com) for about 700 bucks there is nothing special about a turbo on a 8v92 no waste gate to contend with
Link didn't connect for me. Is this the same http://www.turbosource.com/ (http://www.turbosource.com/)
No different outfit I cannot get the link to work either type in turbo resources in Lake Havasu
try this one www.turboresource.com (http://www.turboresource.com)
That one works Tom is very knowledgeable on Deroit turbos he started the rebuilding unit for turbos in Salt Lake for Detroit
Bigred
I am talking from experience. When I first got huggy she had been sitting for several years.
On one of my first trips she lost power and started to really smoking.
knew it was the turbo and went to find one.
after pricing them and asking around someone put me on David.
He furnished the turbo and did the install a lot cheaper than I could buy one.
The only thing he said he would steam clean the engine before he would work on it.
Only shop where you can see yourself in the shine on the floor.
Just be nice to Roxane she fills out the bills.
uncle ned
Quote from: uncle ned on March 31, 2017, 07:38:21 PM
Bigred
I am talking from experience. When I first got huggy she had been sitting for several years.
On one of my first trips she lost power and started to really smoking.
knew it was the turbo and went to find one.
after pricing them and asking around someone put me on David.
He furnished the turbo and did the install a lot cheaper than I could buy one.The wife and I have really learned to love Roxanne and David!! The wife never liked going with me to a shop but she looks forward to our trips down there ,as do I !!!
The only thing he said he would steam clean the engine before he would work on it.
Only shop where you can see yourself in the shine on the floor.
Just be nice to Roxane she fills out the bills.
uncle ned
I am curious as to why you think you need a turbo. What is your engine doing that makes you think your turbo is bad.
--Geoff
One easy test is to take off the intake side of the turbo (when it's cold and engine off) reach in with your finger and see if it spins easily and wiggle the shaft to see if it has any play. It should spin very easily with no play. Stiff spin, or excess play, get it replaced. Also, check your air cleaner element. Air filter is an easy $150 fix. Good Luck, TomC
Quote from: TomC on April 01, 2017, 08:22:43 AM
One easy test is to take off the intake side of the turbo (when it's cold and engine off) reach in with your finger and see if it spins easily and wiggle the shaft to see if it has any play. It should spin very easily with no play. Stiff spin, or excess play, get it replaced. Also, check your air cleaner element. Air filter is an easy $150 fix. Good Luck, TomC
Okay, Tom, finally got you on one! You are supposed to have some play when you wiggle the turbine shaft, just not too much. Judging how much free play is acceptable is a matter of practice.
--Geoff
Quote from: Geoff on April 01, 2017, 08:46:14 AM
Okay, Tom, finally got you on one! You are supposed to have some play when you wiggle the turbine shaft, just not too much. Judging how much free play is acceptable is a matter of practice.
--Geoff
yep the turbo has to have play for the oil to do it's job
Quote from: Geoff on April 01, 2017, 08:17:40 AM
I am curious as to why you think you need a turbo. What is your engine doing that makes you think your turbo is bad.
--GeoffHere is what has got me thinking turbo.1 -sluggish take off ,2- sluggish on mountain climbs ,3 - A light trail of oil directly behind and in line with the turbo.Those are my three main reasons.
Quote from: bigred on April 01, 2017, 04:21:58 PM
The reasons you have for a bad turbo are not valid.
--Geoff
I'm with Geoff on this. You need to spend some time diagnosing more before changing the turbo
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Find the oil leak if it is leaking at the center block you may need a rebuilt turbo,change the boost sensor and the hose that maybe be the problem of the no get up and go
Yes like any rotating shaft in a bearing, some free play is necessary. But, as Geoff said, the amount is something that is learned. If questionable, maybe a mechanic friend could give you another opinion. Good Luck, TomC
Quote from: luvrbus on April 03, 2017, 06:55:09 AM
Find the oil leak if it is leaking at the center block you may need a rebuilt turbo,change the boost sensor and the hose that maybe be the problem of the no get up and go
Yes, low power can be from a bad boost sensor or even a good boost sensor that is set for eliminating any smoke at take off. Pete Pappas put a resistor on his DDEC boost sensor so he was able to get more fuel and more power accelerating.
--Geoff
It's usually the hose rotten and broken
Quote from: Geoff on April 03, 2017, 08:53:50 AM
Yes, low power can be from a bad boost sensor or even a good boost sensor that is set for eliminating any smoke at take off. Pete Pappas put a resistor on his DDEC boost sensor so he was able to get more fuel and more power accelerating.
--Geoff
I am going to get this thing to my repair facility before I do any thing .Not a major thing right now .I was at a shop the other day and they were changing the turbo out on a fire truck ,so I asked him what the indications were of a bad turbo and he mentioned several things including the ones I stated,I know this thing is sluggish on take off and has a time or two not responded to the throttle at all .When it did this,I patted the accelerator a couple of times ,and it took off with black smoke coming from the tail pipe .
Not to steel the thread but cliff where do we buy these boost sensors? They are GM sensors right?
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Quote from: Scott & Heather on April 03, 2017, 05:24:41 PM
Not to steel the thread but cliff where do we buy these boost sensors? They are GM sensors right?
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Yours should be the GM 12219935 sensor you see them on Ebay for 60 bucks WW Willams charges me $130.00 for one
Well, the old EPA didn't care about your engine performance, so as far as they were concerned, being the slowest dog out of the gate was fine with their over restricted smog standards as long as you didn't cause some unheard of bug in some desert to get a skin rash. In other words, you do not want a stock boost sensor if you want performance.
--Geoff
Quote from: Geoff on April 03, 2017, 09:52:56 PM
Well, the old EPA didn't care about your engine performance, so as far as they were concerned, being the slowest dog out of the gate was fine with their over restricted smog standards as long as you didn't cause some unheard of bug in some desert to get a skin rash. In other words, you do not want a stock boost sensor if you want performance.
--Geoff If it is determined that I need a boost sensor,what should I replace it with,the afore mentioned number????
You may not need a sensor or a turbo it could be just the by/pass valve on the blower has become gummed,full of oil and coked up ? have you ever clean and serviced it there is only 1 bolt and a 1/4 inch line to remove and check it. The 2 stroke is a little different the blower is the primary supplier of air to the engine on take off till the turbo spools up and the turbo spools with heat and fuel
PS the valve does go bad too
Big Red Drop down I26 and hy 25 then right on hy11 to Palmetto Cove campground this week end.
will be a few old coaches there for a small rally.
Uncle ned
There was some discussion long ago about two bar and three bar sensors but I'm not sure if it related to performance enhancing in the PSI range of our turbos. Geoff can you share more? Ken Arnold said I was suffering from low boost. We don't have a single boost leak anywhere. That's been checked thoroughly. My air filter is brand new. And the turbo spins freely no fin damage at all. No leaks in manifolds at all. New fuel filters and fuel has been turned up a bit in the parameters. 12 psi seems to be my boost max. That isn't quite right. So I'm wanting to replace my sensor and the tubing. Cliff, we remove the bypass to clean it? Not trying to hijack this, the answers given help both me and the original poster.
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Scott, the boost should be around 20 lbs,if you have any restrictions down stream on the exhaust system they won't boost and your piping should be at least 5 inch from the hot side of the turbo to the tip of the exhaust pipe,excessive back pressure will kill the turbo boost
Confirmed the accuracy of your measuring devices?
A real waste to go looking for trouble when the gauge reads wrong...
happy coaching!
buswarrior
Also if you ask some people the intake flow on a stock MCI is not enough for an 8V92 from what I have been told.
;D BK ;D
Thanks guys. Two responses:
1. We used a prolink to get boost numbers while driving. So I'm guessing it's accurate and the coach is slow for being set to 500hp.
2. My filter minder is maxing out...redlining. I have a brand new air filter but it's completely black with soot, so I actually did something you'll all cringe at, but on a calm day, i reset the filter minder, and then I pulled the filter and drove the coach literally one mile on pavement. The filter minder redlined again. What gives? How is there restriction in the intake when there's not even a filter installed!!?
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Filter minders aren't reliable. I don't use one anymore. Try a different filter minder. They are cheap enough.
JC
Quote from: Scott & Heather on April 05, 2017, 11:49:38 AM
Thanks guys. Two responses:
1. We used a prolink to get boost numbers while driving. So I'm guessing it's accurate and the coach is slow for being set to 500hp.
2. My filter minder is maxing out...redlining. I have a brand new air filter but it's completely black with soot, so I actually did something you'll all cringe at, but on a calm day, i reset the filter minder, and then I pulled the filter and drove the coach literally one mile on pavement. The filter minder redlined again. What gives? How is there restriction in the intake when there's not even a filter installed!!?
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You can qualify the Filter Minder quite easily...follow along ... :)
https://www.youtube.com/watch?v=6hAxzh0WRJs (https://www.youtube.com/watch?v=6hAxzh0WRJs)
B_K is on to something...
Can you drop the air filter intake so it isn't sucking down through the built in pipes going up there...
Let it breath from inside the engine room temporarily and conduct a driving test.
MC8, some of us figured it out and cut a hole in the side to open up the air intake. Ridiculously constrained, breathing through a little hole in the radiator intake space.
Those subsequent "cavities to the sky" in later models still don't look the biggest in volume from my casual observations?
CFM of the installed air cleaner assembly? No such thing as too big with an 8V92... I have seen a few busnuts install a pair, irregular pipe routing matters not, y-pipe wherever it will fit, but more capacity none the less.
happy coaching!
buswarrior
Buswarrior: done did that a while ago. I had a hunch that the two rectangular intake tubes were restrictive and dumb and frankly ate into my bedroom space so I renovated them and now the intake of literally just as you say directly in the engine room. Eventually I'll plumb it out the side door for cool air.
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