76gts or gt 42/76

[JZ 97 SS 1500]

what is the differance between the 76 gtq and the 76 gts or gt??

The GTQ is a smaller version of the GTS wheel. The GT I guess you are refering to the GT42. Well the GT42-76 is same as the 76GTS except for the housings and the shaft is larger on the GT42. The GTS turbine in the 76GTS is a turned down version.

 

[turboanthoni]

Now guys with the 42 76 nonBB and the smallest a/r what stall speed can i get away with?
And now the same ? for the 76GTS. As i said before mainly streetcar with stage heads!

 

[Trbobuick]

Good luck Brian, let us know what you end up with!

Vendor just called, he will have the gt42-76 for me in about a week.

 

[norbs]

I would think the bigger shaft would be more reliable than ther gts-76?

 

[et10sec]

gtq 76 turbo

gtq is tough to spoll with out a brake, and thats with a a/c convertor!! i guess that when you need the juice??

 

[turboanthoni]

Someone give me an idea of the stall speed i need
400 with a brake and 3.42 gears with either turbo! 236 solid roller stage heads

 

[JZ 97 SS 1500]

I would think the bigger shaft would be more reliable than ther gts-76?

Yes the GT42 will take a little more abuse. The added shaft size and journal size helps with stability and gyroscopic forces.

Jose

 

[John Wilde]

Someone give me an idea of the stall speed i need
400 with a brake and 3.42 gears with either turbo! 236 solid roller stage heads

A 4000 stall should get you up and going

 

[John Wilde]

Yes the GT42 will take a little more abuse. The added shaft size and journal size helps with stability and gyroscopic forces.

Jose

gy·ro·scope Audio pronunciation of "gyroscopic" ( P ) Pronunciation Key (jr-skp)
n.

A device consisting of a spinning mass, typically a disk or wheel, mounted on a base so that its axis can turn freely in one or more directions and thereby maintain its orientation regardless of any movement of the base.

 

[JZ 97 SS 1500]

gy·ro·scope Audio pronunciation of "gyroscopic" ( P ) Pronunciation Key (jr-skp)
n.

A device consisting of a spinning mass, typically a disk or wheel, mounted on a base so that its axis can turn freely in one or more directions and thereby maintain its orientation regardless of any movement of the base.

lol, thanks for the explanation, I should have clarified some.

Jose

 

[norbs]

The question is, what is the stall required to spool a gt42-76 with a 1.01 a/r on a 3.8, or is this just too big and going to end up with compressor surge at light load. Or would i be better off with the gts-76 and what would be the price differences. YOur saying they spool on tiny motors though????

 

[John Wilde]

The question is, what is the stall required to spool a gt42-76 with a 1.01 a/r on a 3.8, or is this just too big and going to end up with compressor surge at light load. Or would i be better off with the gts-76 and what would be the price differences. YOur saying they spool on tiny motors though????

You will be fine, Dave Bamford ran a 76 on a stock ci 109 motor many years ago.

 

[Louie L.]

Norbs,
I cannot give you exact stall RPM's . But i can tell you that my current motor (260 ci) spools the 42-76 fast! This is on the same converter i used on the TSM motor. I believe this converter is about 4k rpm on a 109. I havent looked at it close enough on the new motor. 1.01 housing. It spools quick enough for me to wanna try the next housing up... 1.2???

 

[norbs]

I wonder if i can purchase a turbo without the exhaust housing for a better deal. Then you can sell me your tiny restrictive housing?

 

[John Wilde]

I wonder if i can purchase a turbo without the exhaust housing for a better deal. Then you can sell me your tiny restrictive housing?

Norb, you are killing me.
The housings are like $150.
Buy a new complete turbo with non ball bearing.
Get the 74 or 76 GT42.

 

[norbs]

If I order a gt42 76 and it doesn't spool, instantly on my 231 ci motor with a 3500 converter, i will be blaming you !! John

 

[John Wilde]

If I order a gt42 76 and it doesn't spool, instantly on my 231 ci motor with a 3500 converter, i will be blaming you !! John

I don't need you to blame me, I already have a wife!
If you have the chance I would loosen up the converter to 4000.
Since you are going with bigger heads and came, the engines stall should go up with the same converter.

 

[86brick]

Norbs,

Don't know if it helps any but my buddy Orlando has a 3-bolt 74GTQ on his 234ci iron headed motor and if I remember correctly he is using an Art Carr 3600 stall NL converter (also keep in mind he runs an open exhaust).... Car has run 9.96 @137mph and the turbo spools fast enough to occasionally point the car towards the wall

 

[John Wilde]

Don't know if it helps any but my buddy Orlando has a 3-bolt 74GTQ on his 234ci iron headed motor and if I remember correctly he is using an Art Carr 3600 stall NL converter (also keep in mind he runs an open exhaust).... Car has run 9.96 @137mph and the turbo spools fast enough to occasionally point the car towards the wall

Thanks for the assist Steve!

 

[86brick]

Thanks for the assist Steve!

No problem.. I also forgot to mention that Orlando originally had a 4000 stall converter with the 74GTQ and he decided to tighten up to the current 3600 stall and then he also went from a 3.42 gear to a 3.23 and the car picked up 5 MPH, but not much in the way of ET because the suspension is lacking... He went from running a 9.98 @132mph to 9.96 @137mph...