I have a turbo sitting in my garage that I was going to use for another project, but I'm casually crunching some #'s now to see if it would work on my LT1.

The turbo has an 80mm compressor inlet. The compressor housing says "1.10 A/R" on it. The exhaust side has a 0.84A/R and it looks to be an internally waste-gated T3 style exhaust flange.

Based on those #'s, It seems like it would be a little small for a 350 V8. IMHO, it would spool up to full boost well below 3000rpm, and be on the ragged edge of doom by 6000rpm. (I wouldn't ever go past 6000rpm on this engine) I wouldn't be looking for max HP, but rather a kick in the pants for mid range rpm.

The kicker is: the turbo came off of a ford powerstroke 7.3L diesel. That leads me to believe that the turbo is larger than I'm making it out to be. Even though those engines only turn up to 3500rpm, they are soo much bigger than my LT1, that it seems like it would have similar airflow requirements.

 

i believe those are holset turbos, i dont remember what the powerstrokes use, but most people use them for honda setups. ideally, you would want two for a LT1, or maybe use it for a rear mount setup

 

I know it's a garrett. It is molded on the side.

Typically used for honda's?

That clues me in that it's WAY to small for this engine.

 

Start with finding a compressor map and plot your pressure ratio and rpm.

 

the garrett turbo i have is off of a 6 cylinder detroit diesel, 552 cu in, using it on a 355 if that tells ya anything.

some people use them for DIY kits for 5.0 mustangs though, so like i said, you can probably get away with using it as a rear mount seutp

 

Sounds pretty big to me. Get a picture up.

Lt1s love to make midrange power on boost. Takes a lot more head/cam to get us to make more hp than tq especially by any amount. I'm doing 100 more tq than hp and that seems to be common with old lt1s.

 

After more research, I've found out it's technically called a GTP38. I can't seem to find a compressor map for it though.

I'll post a pic tommorrow. It's actually not very big at all. It has a 3" inlet, and it's got a t3 style hotside, which I always associated with smaller turbo's.

It's about the same size as the 60-1 I had on my V6 turbo camaro. I'd say it's about 10% smaller than a T70 with respect to the actual physical dimensions of the turbo.

I just discovered "the turbo forum", and like it was mentioned earlier, it seems to be a popular choice for 5.0 mustangs. Since I am looking for midrange torque vice high rpm power, I think I might like that better anyways.

Stock it has a .84 A/R turbine, but I can get a 1.00 or 1.15 very easily if that would keep it from surging at 4000rpm or so. That would also make it spool slower.

Of course, I could get an T70 off ebay for dirt cheap too....