GTP38R..... 20 lbs??? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 25 (permalink) Old 09-21-2009, 05:17 PM Thread Starter
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GTP38R..... 20 lbs???

I just installed this and I am only getting 20 lbs of boost. My stock one was about 25 or 26. Why the drop?


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post #2 of 25 (permalink) Old 09-21-2009, 05:22 PM
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Re: GTP38R..... 20 lbs???

I just installed one this weekend as well. Mine is only doing 20 as well. No complaints as the truck still runs great I haven't lost any power. I pulled drove 6 hours round trip saturday night and hooked to the sled. It may be the way the tuning is for the trucks both having PMR's? Maybe someone else will know I wasn't going to worry about it...
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post #3 of 25 (permalink) Old 09-21-2009, 05:25 PM
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Re: GTP38R..... 20 lbs???

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Originally Posted by independentreb12 View Post
I just installed this and I am only getting 20 lbs of boost. My stock one was about 25 or 26. Why the drop?
What are your EGTs doing?
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post #4 of 25 (permalink) Old 09-21-2009, 05:26 PM
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Re: GTP38R..... 20 lbs???

My boost dropped going from stock to TN and 38R.

It's moving more air... that's why, but I bet your top end power has increased.

So long as you don't have a boost or exhaust leak.

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post #5 of 25 (permalink) Old 09-21-2009, 05:33 PM Thread Starter
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Re: GTP38R..... 20 lbs???

matt, my egt's appear to be the same. no drop.


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post #6 of 25 (permalink) Old 09-21-2009, 05:40 PM
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Re: GTP38R..... 20 lbs???

No worries bro, boost will be less with the 38r, but you are moving more air.

As quoted by a self proclaimed powerstroke genius.....

"Boooosht is a meshure of reshtricshun....."
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post #7 of 25 (permalink) Old 09-21-2009, 06:10 PM
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Re: GTP38R..... 20 lbs???

Top end boost on my truck in sig is 34 psi. Make sure your waste gate is not opening on you.

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post #8 of 25 (permalink) Old 09-21-2009, 07:43 PM
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Re: GTP38R..... 20 lbs???

No boost or exhaust leaks here. The truck does seem to pull harder top end that before. Bottom end may be a little better too. It definately sounds better!! Only hitting 20lbs doesnt bother me a bit!
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post #9 of 25 (permalink) Old 09-21-2009, 07:45 PM
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Re: GTP38R..... 20 lbs???

My EGT's are about the same... Never really pays close attention to them before anyhow as they have never been an issue.
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post #10 of 25 (permalink) Old 09-22-2009, 03:56 AM
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Re: GTP38R..... 20 lbs???

Do you have the wastegate plugged in?

I had mine plugged in at first and only about that amount of boost, then i unplugged it's now 36 psi @ WOT

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