Turbo for my 4.1

[CTX-SLPR]

Howdy,

I've found a turbo on racing junk that is pretty close to what I was looking for myself but I wanted to run it past the experts here. Its a heavy 3800-4000lb street hybrid with a 3.42 rear gear. Motor is a production block 4.1 with a 212/212 cam roller with 1.65 roller rockers, champion intake, and CNC iron heads. I'm not caging the car so no dreams of the 10's here but I'd like to be able to make "hero" numbers with the help of alky in the mid 650's at the flexplate. GTwheels and dual ball bearings seem to be the way to keep the stall down either with the SP400 or the TH200-4R which ever I end up going with. Ya'll advice would be greatly appreciated.

Thanks,

 

[49-blues]

A rebuilt LT-70 is going on mine.

 

[ESP Products]

I read the specs. Expect LAG, big time. We have a '94 Supra (single turbo) at the shop. The car is beautiful, but can't get out of it's our way until 15-18+ psi; then it's a rocket. The Supra is making 640 HP, but from idle to 15psi it just feels heavy.

Hope this helps you.

 

[Eticket]

If this is a GT40 (smaller than gt42).. it should spool like crazy..

For a production 4.1 with iron heads.. why not a Te63 or te45a (same turbo).. will make power to almost 130mph in a GN and plenty streetable. I really think with a 4.1, you could get away with any variant of the T70 PTE 70 70gtq 70 ptrim, qtrim.. or whatever.. the cubic inches will help the spool without a monster converter.

PS.. a supra is only a 3.0L.. that's why turbos "seem" to spool much better on a bigger cubic inch buick.

John

 

[Blazer406]

That is IMHO enough turbo to run over the crank in a short order...... a 45A should be a plenty...... if not too much.... and would probably spool quicker on the 4.1..... even then it is probably still enough turbo to kill a stock blocked 4.1...... IMHO....