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  #1  
Old 09-21-2009
gcyeaw's Avatar
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Default 3208 250 hp turbo

How fast does your turbo spool up on your 250 Hp 3208? It seems to take 3 to 5 seconds for mine to spool up, and then it peaks at 8 to 9 PSI. It is not going 120k rpm from the sound, so maybe it needs some work.

I am also putting out increasing amounts of black smoke when I hit the loud pedal. I know I need to inspect the entire system for leaks or obstructions, but I realy don't expect to find anything significant.

How do I narrow the balck smoke thing down to eliminate or implicate the turbo?
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Old 09-21-2009
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I thought bad turbo meant sit on the shoulder? Do you know if your gauge is right? Gardner, we go right to 14lbs in best case scenario's, less if the throttle position does not match the rpm and/or load (load meaning hills and such, not groceries and water) I took Randy's advise a while back and started running Lucas fuel treatment all the time, we blew black smoke for a while then it really smoothed out and the boost moved up from 12 to 14.5 ( so says my gauge) As far as spooling up is concerned, I'm not sure I can really tell, but, at 10 psi it starts making real power, less than that is a joke.
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  #3  
Old 09-21-2009
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lose the muffler and that will help the boost.
black smoke is two things,dirty fuel filter and dirty air filters.
if your turbo is making boost,and its not blowing oil its fine.
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Old 09-21-2009
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Quote:
Originally Posted by Randy Dupree View Post
lose the muffler and that will help the boost.
black smoke is two things,dirty fuel filter and dirty air filters.
if your turbo is making boost,and its not blowing oil its fine.
and,you could have a pressure loss between the turbo and the engine,bad hose,loose clamp.
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  #5  
Old 09-21-2009
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Exhaust leaks between the engine and turbo may cause reduced boost also.

Soot/black would mark the leak normally.
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  #6  
Old 09-22-2009
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Your problem sounds like a turbo boost leak. Check for a loose or broken connection between the turbo and the intake manifold. It also could be a gasket on the intake manifold. Black smoke is caused by a lack of air and to much fuel. The turbo must have a leak free connection between the pressure side and the cylinders to achieve good combustion. ( turbo boost) Black smoke and poor performance can also be caused by air inlet restriction. Check the air filter . Check the air inlet tubing for possible restriction.
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  #7  
Old 09-22-2009
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Thanks for the responses. Loosing the muffler is in the plan, but I need to convince the other half that loud is good.

Since the black smoke seems to be getting worse, I will inspect the entire input path for anything that might be restricting it. The air filter was new last year, but who knows what might have gotten in there.
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  #8  
Old 09-22-2009
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Gard,if you have an exhaust leak in the cat house area,all of that soot will end up in the air filter,well,not all,lots of it will be all over you after you get it fixed!
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  #9  
Old 09-22-2009
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A bad injector or two could also be a possibility...not sure how to identify a bad injector though.
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  #10  
Old 09-22-2009
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I lost the muffler, increased the pipe diameter to 5" and turned out before the genset pipe. Sound is subjective, IMO the DB increase is marginal keeping in mind the outlet is three feet forward of the original position. Added 'trick turbo' saw 13# before the CAC install, 10 after, higher numbers when ambient temp is cooler. Bottom line is the 3208 is woefully underpowered for the weight of a FC. Every thing has to be working perfectly for minimal performance and in my experience all the stops HAVE to be pulled out in pursuit of power or an FC is hazard on the road. It sucks when loaded semi's blow by on the grades.
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