GTP38R Injector Limits - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 30 (permalink) Old 06-02-2010, 12:43 AM Thread Starter
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GTP38R Injector Limits

Pretty simple, as the title implies, what are the injector size limits with a 38R? Thats what i have on my truck right now, and when the funds allow id like to get some hybrids. Based on my small amount of knowledge, 238/80 would be safe. Right? What about 238/100 or even 250s? I imagine good tuning is very important for this setup too. Also how much power would that give me? Im thinking at or very near 500 HP correct?

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post #2 of 30 (permalink) Old 06-02-2010, 12:47 AM
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Re: GTP38R Injector Limits

238cc 80% with a 38r will get you in that range with the right suporting mods and good tuning. Personally I would not go bigger then 238s unless you plan on more in the future.

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post #3 of 30 (permalink) Old 06-02-2010, 12:47 AM
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Re: GTP38R Injector Limits

I would say that 238/100's are about the limits of that turbo. And Im pretty sure that there are a few members on here putting down over 500 rwhp with a 38R and 238/100's. Anything bigger that that, (and this is just my opinion) I would go with a modded H2E, GTP42R or equivilant.

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post #4 of 30 (permalink) Old 06-02-2010, 01:01 AM Thread Starter
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Re: GTP38R Injector Limits

That probably as big as ill ever go with this truck. I want it to haul some serious ass, but i want drivability as well. I still want to be able to tow with it. Its some what of a toy but i still want to use it for what it was made for. Plus i do have a budget.

This is still a good daily driver/towable setup right? Also how long can i expect the turbo to last with this setup? Will it still be reliable? Also is this even safe for a stock engine? It does have factory forged rods.

2000 F-250 XLT, 4X4 Ex. Cab, 7.3L PSD - Forged, 4R100

DIY Intake, 4" turbo back exhaust, GTP38R, AIH Delete, Isspro gauges, TW chip, 6.0 Intercooler, BTS Transmission

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post #5 of 30 (permalink) Old 06-02-2010, 01:04 AM
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Re: GTP38R Injector Limits

It is a safe set up and has proven itself. Push rods, springs, studs and more fuel will keep it reliable. Its a great dd set up

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post #6 of 30 (permalink) Old 06-02-2010, 01:20 AM
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Re: GTP38R Injector Limits

238/80 is ideal for that turbo IMO.

The concern is not so much the volume but the nozzle. So a 238 or 250 makes no differences with the 38R.
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post #7 of 30 (permalink) Old 06-02-2010, 01:29 AM Thread Starter
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Re: GTP38R Injector Limits

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Originally Posted by NE-STROKE View Post
It is a safe set up and has proven itself. Push rods, springs, studs and more fuel will keep it reliable. Its a great dd set up
How necessary are studs and push rods? I know springs are a must.

No danger of a new inspection hole in the block?

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238/80 is ideal for that turbo IMO.

The concern is not so much the volume but the nozzle. So a 238 or 250 makes no differences with the 38R.
Why do you say no real difference between 238 and 250? Turbo can't push enough air?

What kind of boost pressures will i end up seeing with this setup?

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DIY Intake, 4" turbo back exhaust, GTP38R, AIH Delete, Isspro gauges, TW chip, 6.0 Intercooler, BTS Transmission

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post #8 of 30 (permalink) Old 06-02-2010, 01:37 AM
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Re: GTP38R Injector Limits

If you want reliable I would do both of those.

Hes saying that the nozzle determines how much fuel gets to the cylinder.

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post #9 of 30 (permalink) Old 06-02-2010, 01:44 AM Thread Starter
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Re: GTP38R Injector Limits

How much power would the setups give me approx:

238/80

238/100

250/???

could i even go with bigger nozzles or am i getting out of the towable range at that point? I would still like to keep some fuel economy. Which rises another question. Under normal driving what kind of mileage would i get with each of those setups? I get about 15 mpg now with stock injectors and TW tunes.

Sorry for all the questions, just trying to learn some and figure out what setup i want to go with when i finally do it.

2000 F-250 XLT, 4X4 Ex. Cab, 7.3L PSD - Forged, 4R100

DIY Intake, 4" turbo back exhaust, GTP38R, AIH Delete, Isspro gauges, TW chip, 6.0 Intercooler, BTS Transmission

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post #10 of 30 (permalink) Old 06-02-2010, 01:49 AM
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Re: GTP38R Injector Limits

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Originally Posted by JakePSD View Post
How much power would the setups give me approx:

238/80

238/100

250/???

could i even go with bigger nozzles or am i getting out of the towable range at that point? I would still like to keep some fuel economy. Which rises another question. Under normal driving what kind of mileage would i get with each of those setups? I get about 15 mpg now with stock injectors and TW tunes.

Sorry for all the questions, just trying to learn some and figure out what setup i want to go with when i finally do it.

those combos are all right around 500ish.... i have 250/100s are tow pretty often and pretty heavy with no problem.. my truck gets 15mpg pretty consistantly no matter what i do or how i drive.... there is always the risk of poping a motor when you start to push them higher and higher

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