turbo question - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 20 (permalink) Old 08-09-2009, 04:54 AM Thread Starter
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turbo question

Now that I am looking into turbos (notice I didn't ask which was best ) I have seen some Garrets listed at various sites (our vendors mostly).

What is the difference between a GTP38, GTP38 Hybrid and a GTP38R other than the obvious prices?

~Dave~

2012 F350 KR Dually, stock...bone stock.

early 99 PSD CC F250, DP Tuner F-5, Stealth Stage I, Casserly 160cc singles, Monsterbox Tranny, MBRP cool duals, ITP Regulated fuel system, Cobalts and Performax gauges, and way to much else to remember right now. **traded**

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post #2 of 20 (permalink) Old 08-09-2009, 05:22 AM
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I may be way off on this but I was thinking a gtp38 is a stock turbo, and gtp38 hybrid is a stock with the same wheels that a 38r runs, and the gtp38r is the ball bearing turbo.

hopefully some one will correct me if I am wrong

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post #3 of 20 (permalink) Old 08-10-2009, 02:18 PM
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i think that sounds about right.

Ken
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post #4 of 20 (permalink) Old 08-10-2009, 02:26 PM
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Sounds right to me.

To my knowledge the other 2 can be rebuilt but the 38r can not be.

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post #5 of 20 (permalink) Old 08-10-2009, 03:06 PM
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38 is stock, and uses the journal bearings.

38 "hybrid" is a rebuilt stocker with either a wicked wheel, larger turbine housing, ATS compressor housing, or any combination of those.... but still uses the journal bearings.

A 38R is the ball bearing.
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post #6 of 20 (permalink) Old 08-10-2009, 03:27 PM
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Quote:
Originally Posted by big_stroker View Post
Sounds right to me.

To my knowledge the other 2 can be rebuilt but the 38r can not be.
I thought the 38R could actually be rebuilt but since the parts are specific to that single model of turbo, they're correspondingly VERY expensive and so the charge to rebuild one is somewhat prohibitive compared to just buying a whole new one.

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post #7 of 20 (permalink) Old 08-10-2009, 03:30 PM
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Quote:
Originally Posted by jvencius View Post
I thought the 38R could actually be rebuilt but since the parts are specific to that single model of turbo, they're correspondingly VERY expensive and so the charge to rebuild one is somewhat prohibitive compared to just buying a whole new one.
I don't even think you can buy the parts to rebuild a 38r but i could be wrong.

1999.5 Ford F-250 7.3l 4x4 PSD DI Short block, Ported Heads, Head studs, Over size valve springs, DI Push Rods, DI RR, GTP38R, GSL 392 fuel pump with 3/8 line feeding 238cc Injectors from Nate @ Unlimited Diesel and Tuning from Matt @ Gearhead Automotive


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post #8 of 20 (permalink) Old 08-10-2009, 03:33 PM
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Originally Posted by big_stroker View Post
I don't even think you can buy the parts to rebuild a 38r but i could be wrong.
I could be wrong too, but I remember reading that little info-bit a few years back re: a 38R rebuild. IIRC the "rebuild" pretty much consisted of buying a whole new center section/shaft then bolting your wheels/housings onto it, unlike rebuilding a regular 38 where you re-use the center section and put in new bearings/seals.

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post #9 of 20 (permalink) Old 08-11-2009, 05:53 PM
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I dont think a person can rebuild a 38R, it has to be sent back to Garrett to be rebuilt. but the turbo is rebuildable.

Ken
99.5 7.3L PSD 4x4
GTP38R BB TURBO
Casserly 250cc Hybrid injectors
BTS Trans W/ 6.0 Trans cooler
Live Tuned by Jody
TYMAR Intake/Coolant Filter
463hp and 912 tq 6 Feb 10
491hp 944tq 28 Aug 10
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post #10 of 20 (permalink) Old 08-11-2009, 07:32 PM
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Quote:
Originally Posted by jvencius View Post
I could be wrong too, but I remember reading that little info-bit a few years back re: a 38R rebuild. IIRC the "rebuild" pretty much consisted of buying a whole new center section/shaft then bolting your wheels/housings onto it, unlike rebuilding a regular 38 where you re-use the center section and put in new bearings/seals.
You sir are correct, I just went through this dilemma a couple months ago. The center section will run you upwards of $1500.00 and then you have to get it balanced. I went the Hybrid route with my old GTP38 stock turbo. I honestly can't tell any difference performance wise and I think it is actually slightly louder. dave I'll shoot you a PM where I got mine done up.

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