Inliners International Forums General Discussion Blown and Injected gm-8 turbo

What is your opinions on using a GM-8 (6.5TD) turbo on a 250 or 292?
I have one (GM-8) on my 6.5 turbo diesel. It starts building boost at 1500. A 6.5 is only good to rev to 4K or so, I think this would translate to 4,000 for the 292 and 6300 rpm for the 250. If I am on the right track, this would start building boost in the 2200-2300 on a 250, or around 2ooo on a 292. My 6.5 builds 15 lbs fairly easily.
These turbos are fairly cheap here.
Good or bad idea?
I would like to turbo the 250 (or could put in a 292) in my 67 chevy short bed. Kicking around ideas, money is always short.
If this would work, what horsepower could I expect from a 250 or 292? What flange does the GM-8 have, is it like a T-3 or T-4?
I am looking to build this engine for a semi-daily driver, with an occasional trip to the track (street tires only no slicks). I was thinking of changing the 3 on the tree to a 700R4.
I have a 3.08 in it now.
Thanks for the input
Lee

can you get a air flow map for the compressor? they should be available somewhere on the net. 6.5l is alot bigger but does not rev as high. the 292 will only rev to around 5000. 15 lbs boost is going to need a intercooler and timing control. the 292 would really storm. tom

We need to know the specs on the turbo,A/R on the turbine housing. Compressor size, etc.
I believe they are really designed to use on diesel,so they would not be that great for a non diesel application.

What price is fairly cheap for those turbos?
If they are less than $200,, give it a shot, otherwise you can find decent used turbos for a six cylinder for $150-$400 dollars depending on your search.
Or even take a chance w/those cheap$ import turbos on Ebay?
Here is one, Ebay Item number: 120130021460
Buick GN (Grand Nationals) forums are always selling turbo's & you can find Syclone/Typhoon turbos also.
Find a Duramax forum & do a search for your questions, that might give you some answers.

MBHD

These turbos seem to be specifically built for GM and I have never seen a map for one. If I had one to disassemble, I could get the A/R and wheel size, etc. but don't have one to tear apart.
Do you think the 292 would be a better turbo motor than the 250? 5,000 RPM on a turbo motor would be fine with me.
Yes I realize that at 15 lbs i would need some way to cool the air, ie. inner-cooler. I was "hoping" to be able to mega-squirt it and incorporate some timing controls
I think I could get a GM-8 that was usable for around a 150.
I know it would be a guess without a map, but any thoughts on horsepower probabilities????
With this turbo being designed for a diesel,If it looks like I am wasting my time & $$$ on this turbo, I'll wait and get the GN or a 60-1.
Are the sy/ty turbos much different from the GNs?

here is some info i found. http://www.dieselplace.com/forum/showthread.php?t=21355 .

292's are not known to be good on gas.
Not sure if that has any bearing on your choice?
250,,,292,,,Depends on how heavy is this vehicle you are installing the turbo in?

MBHD

Tom, thanks for the link. I've searched in the past, but never saw that thread.
It says this about the GM-8
"It's an IHI turbo and the only thing I can tell you is the inlet wheel is very similar to a V wheel from turbonetics for their T04b stuff. The exhaust wheel has the same dimensions as a T3 stage II exhaust wheel."
Is this similar to any turbo that a map is available for.
Mbhd, You are right, gas is getting to be more of a concern and probably will continue so. I think I'll go with a 250 unless there is a good reason not to. This truck weighs around 3,500#. Not wanting to tow with it. Still thinking the 700R4 for a trans.
What results should I expect on a good 250 with a GM-8? I guess I'd be stuck with what housings and A/R that it comes with. I know of no after market parts for these.
Will I be better of saving for a GN or 60-1 turbo?

i would tell you to save and buy the right turbo.

If the turbine wheel is like a Turbonetics stage two, then that wheel is way too small.
Like Tom said, save up & buy the correct turbo.

MBHD