i've got one of those,i'm wondering how to check the exaust for drive pressure leaks?

 

ok first place I would check for exhaust leeks is where the turbo bolts to the manifold where you have the gasket. the only way to check your drive press is to drill and tap your manifold just like your installing a pryo, only difference is this is gonna get hooked up to a press guage just like your boost guage.

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I dout the exhaust leak is your problem cuz it would take a good size leak that you prob would have heard by now ... but it is very good to know what your drive press is

 

A lot of times the exhaust manifold likes to crack along the bottom. Not everyone has it happen to them but it is a fairly common problem. Problem is, they are hard to find without pressure on them. The best way would be to take the manifold off and check it that way. Make sure you use lots of penetrating oil. I like Free made by Certified Labs or Aerokroil made by Kano.

It might be possible to have someone free rev your truck and check for soot leaking out but I'm not sure if that will work or not.

Also did you take the turbo off to change the wheel? Did you use a new gasket? If not then that could be your problem.

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Also while the boost #'s didn't change much the airflow you are putting into your engine did change. The hybrid will move more air at 25 psi than the regular 35 will move at 27.

 

he should be able to hit 40psi no problem with that turbo just watch out about the drive pressures went threw about 6 head gaskets with that turbo becasue it aint a 1:1 drive ratio

 

well i aint gettin close to 40psi

 

not tryin to hijack the thread but I'll ask you this 94Cummins....I thought to high of a PSI was what blew head gaskets? What is this 1:1 ratio you're talkin about and how can it blow a head gasket?

 

the 1 to 1 ratio he is talking about is the drive pressure to boost ratio. 1 psi of drive press to 1 psi of boost is what you want.

 

well i don't fell any difference,and like i said,if there was more air actually getting there,would it not run cooler,this thing gets hot!and i don't understand how it can be flowing more air at a less psi.my motor is not using any more is it?seems to me if you compress more air in the same amount of given space the psi should go up.and the housung is the same size as the 35's will this make any difference?

 

I agree with you if you were flowing more air through the turbo you boost should have gone up, unless you changed something else besides the turbo. did you check for boost leaks? make sure your air filter is clean? does your 35/40 have a wastegate?

 

yes it has a waste gate,and my filter is kinda dirty,i'll try that.and it doesn't seem to have any boost leaks.

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waste gate is plugged.