Turbo Lag?

[Glennman]

I'm not sure what turbo lag is. I drove the bus about 100 miles over some pretty steep grades the other day (first time for such a test) and it seemed to be kind of gutless. The engine is super quiet and there's no tachometer. I got under 6 mpg, but this trip was not a good one for testing that necessarily. How do I know if the turbo is spooling up correctly besides hiring a mechanic? It just seems to be slow on the take off even if there is no hill. Maybe I'm barking up the wrong tree here, or maybe my seeming loss of power has nothing to do with the turbo. Or, maybe it's just fine the way it is? Grasping at straws here! The bus seems to run great otherwise (zero smoke, runs cool, etc.).

[Bill Gerrie]

Are you expecting too much from the bus? Ever driven one before? Is the throttle actually opening all the way? Have somebody push the throttle only all the way to the floor as you watch at the engine

[luvrbus]

Are you expecting too much from the bus? Ever driven one before? Is the throttle actually opening all the way? Have somebody push the throttle only all the way to the floor as you watch at the engine

I am guessing you are speaking of the 4500 with the series 60 ? if so they have sensor that controls the air needed for the fuel ,anyone with a Pro/link can read the boost pressure for you or if you have a code you can pull that up yourself lol if you can read the blinking lights which is impossible sometimes for me ,check for codes first

[freds]

If your engine has DDEC controller get a reader on it. Which will tell you both boost and throttle position.

Also with a turbo look for any exhaust leaks which will cause the turbo to spin slower.

[luvrbus]

Check the HP most D4500 with the 12.7 were just 400 HP from the factory MCI was never big on HP in their buses 400 hp pushing almost 40,000 lbs it may seem weak ,if it has the original ECM there are 3 setting 400,430 and 470 hp have it checked if 400 hp flip on 470 hp and it will go and you will get better fuel mileage also.I set mine on 430 hp with the pedal and 470 hp with the cruise yours is a later model it may not have that option   

[Bill Gerrie]

I didn't know he had an electronic engine. Totally different.you red and amber lights should read out the error code. Flash flash space flash flash is 22 code.

[luvrbus]

I didn't know he had an electronic engine. Totally different.you red and amber lights should read out the error code. Flash flash space flash flash is 22 code.

I just assumed it was the 60 series since no mention of a turbo on the 8v71 in the MCI 8

[Glennman]

Oops, yes, it's the 2002 Series 60. I've owned 6 buses and driven a couple of them thousands of miles (all either 6V or 8V71's, with the exception of this one). Sounds like I need to figure out the codes and such. I might know someone who can look into that for me. I like the idea of boosting up the horsepower a bit. Maybe I'm not just used to the Series 60, but you guys have given me some things to look into. Much appreciated.

[Bill Gerrie]

Check the read out on the SEL and the CEL lights. Should be flash flash pause flash flash flash flash flash (25) on each red and amber. All is normal then. Quick check.

[lvmci]

This might not apply to your 60 series, but certainly effected my 8V71. Clifford found my fuel was coming out the line at 6psi. I had canister and sock lined fuel filters I had just changed,, got some 25% biofuel in Barstow. Ca. The new sock had a line around the sock. Where the biodiesel wouldn't go thru. Clifford blew out the lines. Bio gunk and I passed 18 wheelers going up the hill to Boulder city...

[robertglines1]

any black smoke when pulling hard? on grade?  Might as well ck trans codes also. Maybe not downshifting. Mine does over fuel some(black smoke) but I caused that myself.  Bob

[Glennman]

I wasn't able to detect any smoke at all, but it's 45 feet away! I could have someone follow behind me to see next time. I'll check the fuel filters too. I am getting quite a few black spots on the back doors too.

[6805eagleguy]

I have the blue fire rv adapter which hooks to the diagnostic port and uses Bluetooth to hook to a table and can read out ever parameter on the motor. Good cheap way ti find boost as they are not super expensive. Only problem is if your diagnostic port is at the back of the bus, the Bluetooth will not reach to the front

[robertglines1]

leak on hot side of  turbo. exhaust power to spin turbo.......Leak in your charge air cooler-/hoses to cooler-not uncommon in older coaches=loss of boost to engine. Under load mine can exceed 30lb boost.

[luvrbus]

The guy is lucky he has no VPOD sensor Detroit used from 02 to 06 those things are $700 bucks rebuilt