SOLID LIFTER

I'm looking at buying this GM-8 turbo off a guy but I was unlucky in finding any good info on it.
I'ld like to toss a turbo onto a mild 350 that i've been building in my head. Should I buy it or leave it?

SOLID LIFTER

Side shot.

B4Ctom1

sadly there is no good info on them. I have a GM-5, the guy I got it from put a GM-8 and a big intercooler on his GMC to make more power. He said it bolted right on and that it was a common swap to make more power.
I have heard other people say that the sizing is the same but the GM-3, GM-5, GM-8 merely specifys the housing configuration for fitment in different platforms engine compartments which makes no sense considering how much power his truck makes now.
They seem to be a moderately sized T-4 larger considerably than a GN turbo but with a V8 diesel sized exhaust A/R. Diesel V8 pickup truck A/R's seem to range from .85-1.10 (it looks to be smaller) if memory serves me correct. I think a person would be better off with two of these GM-5 on a big block chevy. It might be suitable for use on a GN even. The Holset found on the small and medium sized industrial trucks seem to be the way, they are half the price and closer to a 60-1 with A/R in the 0.9-1.0 range?

83 Crossfire TA

iTrader: (2)

What does he want for it? Ask him for the dimensions of the compressor inducer and the turbine exducer…, and we could make a better guess.

I know for sure that they are all roughly the same size (what turbonetics would call "frame"), somewhere in the small T04 range, but the different ones are sorta like different trim T04's.

The GM3 is roughly the size of the larger T3's, the GM5 is about the size of the really large T3's or small T04's, but I do not know how much larger the GM8 is.

KiLLJ0Y

when you say GMC, do you mean the Syclone engine? if so i was going to say i owned a Typhoon, and the turbo GMC used was a Mitsubishi, and had a 17g wheel. ran on 14.7 pounds of boost. easily upgradable to 20g. also this type of turbo was oil and water cooled, meaning no idle time needed to cool it off after a run.

B4Ctom1

no I mean 6.5L GMC diesel. That is what they come off of.

SOLID LIFTER

I wasn't going to pay much for it, $50 maybe. I'm not sure what it's worth.
I'm not up on all my turbo lingo ( ) am I correct in assuming that the compressor inducer is where outside air is drawn into the turbo and the turbine exducer is where exhaust gas exits the turbo?

B4Ctom1

suprisingly they sell for $150-$250 on ebay. I havent nailed it down yet but a group of import pilots really like them. They must know something we dont.

83 Crossfire TA

iTrader: (2)

Who's the group that likes them? $50 for one in good shape is a good deal, and yes, the inducer is the width, tip to tip of the part of the compressor wheel where the air comes in (needs to be fairly accurate, within about an mm or about .050" to mean anything), and the turbine exducer is the same measurement on the exhaust side. The COMPRESSOR exducer is the "major" (big) diameter of the compressor wheel and the turbine inducer is the same measurement on the turbine side.

That concludes our first class of turbochargers 101…

B4Ctom1

Back when I was given this one I was trying to buy a second one (for twins sake) off ebay. The guy that won, I asked him a bunch of questions and we got in a debate about them and he showed me some links to guys using them, yet they had no info on them. They were imports of some sort, I cant remember. sorry I didn't retain any of the links now. I was trying to wring some info out of them but got no where.