turbo question
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Senior User
Joined: Sep 2007
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turbo question
Hey guys a few months ago i found and installed a used turbo setup for my old 86 6.9. I got it set up pretty good it runs smooth but i have hit a maximum of about only 9 psi. boost. I have the IP turned up, a straight pipe exhaust with 6'' stacks, and a good free flowing intake setup on it, but i just want more boost and power. I am working on a propane setup next, it is almost ready so i guess I will see how much more power i can get out of it.
My turbo is of one i have never heard of...Rajay is the manufacturer. It is a free float, non-wastgated turbo. I think I will look for a different one like one i have heard of before.
Here is a question....for choosing a turbo, i should go for a bigger one right? I always saw it as you want more volume then psi for a diesel?? how about you tell me.
Thanks.
My turbo is of one i have never heard of...Rajay is the manufacturer. It is a free float, non-wastgated turbo. I think I will look for a different one like one i have heard of before.
Here is a question....for choosing a turbo, i should go for a bigger one right? I always saw it as you want more volume then psi for a diesel?? how about you tell me.
Thanks.
More Turbo
Joined: Jan 2008
Posts: 679
Likes: 3
From: Vancouver B.C.
I don't know too much about turbo's and this might be incorrect but it sounds like you've reached maxed boost if it's non wastgated , or getting real close.
ATS and BANKS both sell wastgated turbo's that work really well with our trucks. There are people pushing over 20lbs of boost using the ATS setup.
And bigger is not allways better when installing a turbo...
ATS and BANKS both sell wastgated turbo's that work really well with our trucks. There are people pushing over 20lbs of boost using the ATS setup.
And bigger is not allways better when installing a turbo...
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
A smaller turbo will usually spool faster, but lack in boost at high RPM.
A large turbo will usually build higher numbers, but the RPM has to be high and it takes a long time to spool up.
With a 6.9, the farther you go over 10 or 12 PSI, the sooner you will be replacing head gaskets.
Head studs will keep the head gaskets in place up into the 20's, but 20 PSI is about all the intake gasket(valley pan), exhaust manifold gaskets, and the turbo up pipe connections can handle with out modifications.
Also if you are going over 20 PSI, then milled pistons are next on the list.
A large turbo will usually build higher numbers, but the RPM has to be high and it takes a long time to spool up.
With a 6.9, the farther you go over 10 or 12 PSI, the sooner you will be replacing head gaskets.
Head studs will keep the head gaskets in place up into the 20's, but 20 PSI is about all the intake gasket(valley pan), exhaust manifold gaskets, and the turbo up pipe connections can handle with out modifications.
Also if you are going over 20 PSI, then milled pistons are next on the list.
