norm209326
Member
- Joined
- May 27, 2009
- Messages
- 45
- Reaction score
- 0
- City, State
- Westchester, NY
- Year, Model & Trim Level
- '99 Explorer Sport
I did a custom turbo setup on my 4.0L OHV (in my 99 exploder sport) and Im having trouble with it. Its simply not building boost.
Specs:
Small turbo from a mid 80's Mercedes Turbo Diesel (not sure exactly what size) - internally wastegated and set at 7 lbs
Custom manifold piping and downpipe
Custom charge pipe with blow-through MAF and blow of valve (before the MAF).
Apexi air fuel controller
Stock injectors
66mm (i think) throttle body (its the aftermarket BBK one)
Now, I have the turbo running off only the passenger side bank. All the plumbing is done right, but the turbo won't spool. No boost leak, I would hear the air escaping. The a/f ratio is perfect, as we monitored it with an air fuel meter while tuning. Intake turbine is not spinning on the shaft. The wastegate is not stuck open. So far Ive narrowed it down to the possibility of a vacuum leak (the car doesn't idle that well) as well as my EGR stuck open. However, I don't understand why I wouldn't see at least a little boost (even a pound or two). I plan on getting rid of the EGR and smoking the vacuum system this weekend to see if that fixes anything.
If there are any turbo gurus on here, please give me some input or point me in the right direction. Im getting very frustrated with this build.
PICS:
And the truck
Specs:
Small turbo from a mid 80's Mercedes Turbo Diesel (not sure exactly what size) - internally wastegated and set at 7 lbs
Custom manifold piping and downpipe
Custom charge pipe with blow-through MAF and blow of valve (before the MAF).
Apexi air fuel controller
Stock injectors
66mm (i think) throttle body (its the aftermarket BBK one)
Now, I have the turbo running off only the passenger side bank. All the plumbing is done right, but the turbo won't spool. No boost leak, I would hear the air escaping. The a/f ratio is perfect, as we monitored it with an air fuel meter while tuning. Intake turbine is not spinning on the shaft. The wastegate is not stuck open. So far Ive narrowed it down to the possibility of a vacuum leak (the car doesn't idle that well) as well as my EGR stuck open. However, I don't understand why I wouldn't see at least a little boost (even a pound or two). I plan on getting rid of the EGR and smoking the vacuum system this weekend to see if that fixes anything.
If there are any turbo gurus on here, please give me some input or point me in the right direction. Im getting very frustrated with this build.
PICS:
And the truck