SRTKLLR

iTrader: (1)

I bought a turbo a while back to put on my Silverado with a 408 but want to know exactly what turbo it is and how much hp it can handle. It is supposed to be a Garrett GT-76 but there is no such thing on there web site.

Here are some pics of the turbo:

Ericmck2000

http://www.google.com/search?sourcei...4+turbo+.70+ar

Looks like a garrett from looking on google, but, im not a turbo expert.


http://www.zerotohundred.com/newforu...ar-70-m24.html
Looks the same as this one.

So.jerZ-28

iTrader: (20)

looks like an ebay turbo to me.

m24 on the housing, gold retainer plates, type in t70 turbo .81 a/r on ebay and compare

SRTKLLR

iTrader: (1)

I am petty sure the components are Garrett but I want to know the specs so I can figure out how much hp it will allow me to make.

SRTKLLR

iTrader: (1)

Anyone else that might have some insight please post up.

SRTKLLR

iTrader: (1)

Doing some more research I found that not all Garrett Turbos have their logo because they were built by one of there Performance Distributors(PD) using Garrett parts. The old housing did not have Garrett on them they had an "A" for AiResearch stamped on the turbo housing. You can see the stamped "A" on the fourth pic I posted.

"Sometimes we have housings that don't have the Garrett logo on them for various reasons. When there is no logo you can either find the "flying A" identifier (looks like the first letter on the AIResearch turbo) on the housing or sometimes a the housing part number is stamped near the compressor discharge or by turbine housing inlet on the side of the flange." GarrettGTBB

So I know it is a true Garrett but now how do I tell what size and how much hp it will handle?

Grr

iTrader: (2)

measure the wheels, common sense is that would tell you what "size" it is. Looks like a 76 gt-q to me. Obviously the 4S stamped on the cover means its a S-cover with 4" inlet

SRTKLLR

iTrader: (1)

I was a little hesitant to open up the turbo as I have never done that before and was scared I might not put it back together correctly. But, a friend came by with his caliper and we went ahead and unbolted it and measured the wheels. Based on the measurements what exactly do I have and how much hp is it capable of?

Grr

iTrader: (2)

Garrett 76mm p-trim
would work great on a 4.3, decent on a 5.3, but on a 408, no way. Thats a pretty common turbo for buicks, supras and such but you will do no good with that small exhaust side on a stroker. Sell it and buy something bigger

SRTKLLR

iTrader: (1)

Would it be ok for say 600-700 rwhp on my truck?

Grr

iTrader: (2)

i dont think it will make 600whp without the backpressure being so high it starts breaking stuff

Pat-Man

iTrader: (3)

If you are running a 408, then that turbo is too small. Ask me how I know? As soon as I get all the supporting mods taken care of (valvetrain, transmission, and rear) I'm going to go with a GT-91. The 76 is great for almost instant spool, but when you start turning up the boost the back pressure get dangerously high because of the small exhaust housing. You could definately run it, but if your goals are for 600 - 700 HP then you'll want to go bigger.

Atomic02

iTrader: (33)

I have a big *** garrett turbo that I can't figure out exactly what it is but I think it's too big for my setup. on the exhaust housing it says M1 AIR 1.88 and N88-85 has a 5" diameter and 11 blades. intake housing says M24 AIR .95 has a 5" diameter and has 6 blades. no clue what size it is?? if it's what you're looking for maybe we could trade?
mine spins freely has no damage and is in good shape.

Pat-Man

iTrader: (3)

post up some pics if you can

SRTKLLR

iTrader: (1)

Yeh, post up some pics. As you cans see mine in brand new never been used. It is supposed to be good to 1000hp.

The STS kits come with a 60-1 but you can upgrade to the GT 67, 70 or 76. Mine is the upgraded GT-76 but apparently it is too small for me. I am not looking to make that much power. I am currently making just 300 rwhp and have run a best of 13.3. I wanted to double my hp to 600 so I figured I would need to push about 16psi. I am hoping to run 11's with the turbo.

My kit is no longer a STS but is similar with the turbo mounted down low where the stock exhaust manifolds end but the turbo is from them.

Maas

It isn't necessarily more boost that make more power, it is more airflow.

Find a compressor map for this turbo, and plot yourself on it, and go from there.

SRTKLLR

iTrader: (1)

The problem is sometimes there are no maps for the given turbo. The closest I found was a T76 compressor map but I don't know if it is also a P-trim or what size turbine it uses. I used 600 hp and 6200 rpm max with a 408 and it calculated about 10 psi and this is what it spit out.

Atomic02

iTrader: (33)

I'll try to get some pics up later. I've tried to research it but found nothing any1 have any ideas? this things f-in huge!

CarsandWomen

iTrader: (19)

measure it in the same way and same place as the
OP, then post the measurements and pictures.

Atomic02

iTrader: (33)

did a lil research and I have narrowed it down to two.
it's either a TV8513 p/n 23503264 88mm unit or a TV8117
p/n 8923340 unit over 100mm! not sure exactly but i'm thinkin it's the biger 1 and it has air 1.88 on the hot side. way too big for my setup.