Well this is my current project for my 89 350 TPI motor rebuild to go in my 86 IROC. Im planing on using two rebuild Saab turbos. I have aqurried one and looking for another. Im using 89JYturbo's idea of manifolds. I just have to build around AIR pipes b/c i need them. A few pics :

 

2:

 

Can i use these pistions? http://cgi.ebay.com/ws/eBayISAPI.dll...65332188&rd=1.

 

I would invest in forged pistons if you are tearing the motor down. OTOH, I run stock cast pistons at a 9.3 C/R, so they do hold up to low boost, especially if the tune is conservative. But why take a chance if you are buying new pistons anyway?

Another thought- I'm not too sure how well the AIR will hold up on the turbo application. The problem I see is that the high pressure and temps induced from the turbine restriction may cause the AIR check valves to leak an severely hurt the performance of the system. In your area, is the emissions just a visual as in my part of PA? If so, maybe you want to consider plugging those lines, so it looks legit fromt he outside, but will solve any reliability issues with the AIR check valves- you didn't here that from me =). Just a thought.

BTW, do you have any specs on the Saab turbos? I'm assuming they are the 45 trim T3'? (.42a/r compressor, .48 turbine a/r) They will give nice response, but slightly deminish top end due. I made 328rwhp and 468rwtq with two 45 trim T3's, so they are more bottom end oriented. I lcan't wait the drag race/chassis dyno my T3/T4 hybrids! (TO4E 57trim compressors, T3 stage II .63a/r turbines).

Good luck with your project!

 

Dont know much about the turbos. Yes it is a 45 trim. Ive decided to use stock CPR pistons with a fairly thick headgasket. Yes the emissions are visual here in adams county. The car will be my daily drive if the weather is decent. Going to get another turbo and two ICs friday. Also what size AN hose should i use -4 or -6. Will the pressure off the main in the back be enough psi? Im using a Heavy duty one in the rebuild kit im getting. Should i drian the oil back into the pan or into the FP block off plate? thanks

 

Be careful about using thick head gaskets to lower compression, you might end up causing more detonation than you'll prevent by enlarging the quench clearance, depending.

If you're talking about the oil feed pressure from the old-style oil pressure sending unit port, yes it'll be enough. I'm not sure what size hose to use because I always forget what size is what.
You can drain the oil back into the pan, just make sure the hole is above the oil level in the pan so drained oil doesn't back up. I'm not sure about the FP block off though. If your turbos will be above the valve covers you could also drain them back into those ala BBSDesigns.

 

Using the FP block off works just fine IF you have the correct engine block.



Look at this picture: (click to enlarge)



There is one big hole going up to the cam and a small oil drain hole at the bottom. If it looks like this then it works.

I would not use the FP block off on a twin turbo, then I would make an oil return to the pan on each side.

 

Nice Turbo man. Now, its a bit small for the application imo. Try getting a Super 60 from a Ford Turbocoupe series. Very nice turbo. Since your car is N/A. Becareful of the boost level you run. If you want to keep it down. Stick with the smaller one ya got. It will spool as fast as you can say "3rdgen". If your planning on major engine management, fuel works, other stuff. Look into a bigger turbo for more boost. If you get some mild headwork and lower-comp. Get boost happy.

 

he's going to have two of those things.