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  #1  
Old 01-31-2012, 06:29 AM
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power increase from gtp38r

Been reading about the gtp38r and some places are saying a 80 gain with a chip and exhaust from just a turbo upgrade i find that kinda hard to believe i can understand 25hp or so is there any truth to what they say ?

im planning on picking up a stage 3 snow system in the next few days and maybe a 38r before i do my injectors
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  #2  
Old 01-31-2012, 11:26 AM
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Re: power increase from gtp38r

Who is "they"? I've really never heard anyone say that there would be an 80hp gain from just a turbo swap on an otherwise mostly stock truck.

And no, you won't see much, if any, of a power increase. You'll get lower EGT's, possibly a teeny bit of boost, but that's about it.

By the way, I did directly compare the power output from a stock turbo vs. a 38R with stock injectors and a chip. Prior to the turbo swap, I ran my truck at Bandimere, making many many passes down the 1/4 mile. After the turbo swap, I went back to Bandimere, making many many more passes.

The result: There was zero difference in times and trap speeds.

However, EGT's were about 100 degrees cooler with the 38R.

So..... there you have it.
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  #3  
Old 01-31-2012, 12:36 PM
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Re: power increase from gtp38r

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Originally Posted by Pocket View Post
Who is "they"? I've really never heard anyone say that there would be an 80hp gain from just a turbo swap on an otherwise mostly stock truck.

And no, you won't see much, if any, of a power increase. You'll get lower EGT's, possibly a teeny bit of boost, but that's about it.

By the way, I did directly compare the power output from a stock turbo vs. a 38R with stock injectors and a chip. Prior to the turbo swap, I ran my truck at Bandimere, making many many passes down the 1/4 mile. After the turbo swap, I went back to Bandimere, making many many more passes.

The result: There was zero difference in times and trap speeds.

However, EGT's were about 100 degrees cooler with the 38R.

So..... there you have it.


Great info
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Old 01-31-2012, 12:45 PM
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Re: power increase from gtp38r

Largest claim I have seen was 16 hp.
Which you will have a hard time feeling.
Now spool, surge, temp diff you can see.


Now if you had large injectors, and did a turbo swap, maybe.
But basic mods only no great diff.
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Old 01-31-2012, 01:30 PM
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Re: power increase from gtp38r

I went from 320hp to 351 hp on the dyno. But that was different dyno's, thousands of miles apart.
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Old 01-31-2012, 02:16 PM
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Re: power increase from gtp38r

ok thats great to know if i can gain some better spooling charictaristics and better street manners and if i only get minimal gains im a happy camper i would imagine that a 38r swap and water/meth injection would make my truck run very well untill i get the injectors
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Old 01-31-2012, 02:25 PM
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Re: power increase from gtp38r

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Originally Posted by Boogeyman View Post
Been reading about the gtp38r and some places are saying a 80 gain with a chip and exhaust from just a turbo upgrade i find that kinda hard to believe i can understand 25hp or so is there any truth to what they say ?

im planning on picking up a stage 3 snow system in the next few days and maybe a 38r before i do my injectors
What, exactly, are you reading? If you add a chip, exhaust, and a 38r turbo, to a stock truck, you can gain 80 HP.
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Old 01-31-2012, 04:24 PM
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Re: power increase from gtp38r

I dynoed a 30 hp increase with no other changes when I went from a stock turbo to the 38r.
Truck had intake, exhaust, and six position chip.
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Old 01-31-2012, 05:22 PM
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Re: power increase from gtp38r

searching gtp38r on ebay they say 80 gains with a chip and exhaust
i already have tunes and i know i have more than 80hp over stock already. i was just wondering what over what it is now would/should i gain from just the swap
im just looking at it from a egt/boost response standpoint mostly since i plan on doing some pulling with it and street fooling around if i happen to gain 20 -30 hp great
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Old 01-31-2012, 08:54 PM
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Re: power increase from gtp38r

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Originally Posted by Boogeyman View Post
ok thats great to know if i can gain some better spooling charictaristics and better street manners and if i only get minimal gains im a happy camper i would imagine that a 38r swap and water/meth injection would make my truck run very well untill i get the injectors
The spool up is right now vs. the stock turbo.
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