GTP38R/ USA (Turbonetics) turbo comparison - Diesel Forum - TheDieselStop.com
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Upgrades and Aftermarket - 99 & up 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 10-16-2006, 10:52 AM   #1 (permalink)
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GTP38R/ USA (Turbonetics) turbo comparison

I see alot of things said that may or may not be true about both turbos so I had my turbo shop get a USA turbo and do the comparisons, these are nonbiased specs, no opinions in the specs they are what they are.

GTP38R -- USA (TN)

Shaft DIA @ Joaurnal .400 .470

Shaft @ Shoulder .250 .313

Turbine Exducer 67.69mm 68.58mm

Turbine Inducer 77.47mm 78.74mm

Compressor Wheel
Inducer 65.91mm 60.96mm

Compressor Exducer 88.14mm 91.31mm

There is a larger Turbine wheel availible for the GTP38 with exducer of 69.85 and Inducer of 77.47.

Turbine housings availible for GTP38 include the 1.0 wg, 1.0 nonwg and the 1.15 nonwg, onlt 1.0wg housing for the USA turbo due to the larger turbine wheel.

He also said that this unit looks to be better quality then one we checked out about a year ago.


So there ya go, there is the facts, I will give my opinions later but will leave it at that for now.
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Old 10-16-2006, 11:55 AM   #2 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

I am running the TN right now and like it... I will (WILL!) be Dynoing both when I get the Garret back. The only real issue I had with the Garret was the surge (and thats bad for me!) No issues with the TN unit other then the spool is somewhat slower and my EBPV brake is not working right ( I dont know if thats due to the turbo being larger in some way or if something is messed up on the valve)... I have a Dyno in town and will do both asap.
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Old 10-16-2006, 12:23 PM   #3 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

I don't think that Garrett info is correct. Looks to me like you have mixed some van stuff in with the GTP38R stuff.
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Old 10-16-2006, 01:00 PM   #4 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

[ QUOTE ]
I don't think that Garrett info is correct. Looks to me like you have mixed some van stuff in with the GTP38R stuff.

[/ QUOTE ]


I will double check if you like but that is all directly off a gtpr, the optional larger t wheel would be a van wheel.
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Old 10-16-2006, 01:23 PM   #5 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

[ QUOTE ]
the optional larger t wheel would be a van wheel.

[/ QUOTE ]

That's what I thought. I also don't think that stock GTP38R turbine inducer measurement is correct. The van wheels and housings are different and should not be interchanged. You can put the van housings on the smaller wheels but they don't fit right. The GTP38R housings won't fit on a van wheel. Is that 1.0 non-wastegated housing for a van wheel or a GTP38R wheel? And BTW even though I don't know why anyone would want one, you left out the .84 WG housing as a option for the GTP38R.
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Old 10-16-2006, 01:31 PM   #6 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

The van parts are Navistar pieces,not Garrett's. I have the 2 non Garrett built by Garrett versions originally made.
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Old 10-16-2006, 02:13 PM   #7 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

[ QUOTE ]
He also said that this unit looks to be better quality then one we checked out about a year ago.

[/ QUOTE ]

You think they've made some changes to the GTP38R recently? I just dropped mine in my truck last month. The stock turbo was a surge king on my truck, and the GTP38R hasn't come close to surging at all yet. I did have Bob Riley port the compressor housing, so that might have something to do with it as well. Maybe a combination of better initial quality and Bob's porting makes a big difference in whether or not these turbos surge. [img]/ubbthreads/images/graemlins/shrug.gif[/img]

There's my rambling, take it with a grain of salt. [img]/ubbthreads/images/graemlins/wink.gif[/img]
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Old 10-16-2006, 03:32 PM   #8 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

[ QUOTE ]
The van parts are Navistar pieces,not Garrett's. I have the 2 non Garrett built by Garrett versions originally made.

[/ QUOTE ]

Do you have to have a hangover to understand this? I've read it several times and scratched my head from several different angles and still don't get it.
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Old 10-16-2006, 03:35 PM   #9 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

[ QUOTE ]
[ QUOTE ]
He also said that this unit looks to be better quality then one we checked out about a year ago.

[/ QUOTE ]

You think they've made some changes to the GTP38R recently?

[/ QUOTE ]

I thought his comment was about the other turbo.
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Old 10-16-2006, 03:38 PM   #10 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

[ QUOTE ]
[ QUOTE ]
The van parts are Navistar pieces,not Garrett's. I have the 2 non Garrett built by Garrett versions originally made.

[/ QUOTE ]

Do you have to have a hangover to understand this? I've read it several times and scratched my head from several different angles and still don't get it.

[/ QUOTE ]

Ya gotta turn yer hat 'round backerds and stick yer tongue outta the corner of yer mouth when ya read that. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
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Old 10-16-2006, 04:22 PM   #11 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

[ QUOTE ]
[ QUOTE ]
The van parts (mentioned above are Navistar parts meaning Navistar owns the tooling and Garret just makes it specifically for Navistar ) are Navistar pieces,not Garrett's. I have the 2 non Garrett( Navistar 1.15 van turbos converted to BB) ) built by Garrett versions originally made for me for testing purposes.

[/ QUOTE ]

Do you have to have a hangover to understand this? I've read it several times and scratched my head from several different angles and still don't get it.

[/ QUOTE ]
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Old 10-16-2006, 04:45 PM   #12 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

Well it sounds like you are saying the 1.15 housing for the GTP38R is the same as the 1.15 housing for the van turbo. Which turbine wheels do those two turbo's have?
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Old 10-16-2006, 05:10 PM   #13 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

[ QUOTE ]
Well it sounds like you are saying the 1.15 housing for the GTP38R is the same as the 1.15 housing for the van turbo. Which turbine wheels do those two turbo's have?

[/ QUOTE ]
NO,they are not the same hence the above post. Garrett made their own version(smaller)because Navistar owns the mold and the rights to the original larger version.
I have the larger versions.
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Old 10-16-2006, 05:27 PM   #14 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

Can you tell any difference between the performance of the two versions?
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Old 10-16-2006, 05:43 PM   #15 (permalink)
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Re: GTP38R/ USA (Turbonetics) turbo comparison

[ QUOTE ]
Can you tell any difference between the performance of the two versions?

[/ QUOTE ]
No I can't,the 1.0 actually feels like it pulls harder [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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