REEMB18C1

i have a top mount exhaust manifold which has a t4 flange . i just realize the turbo i bought has a t3 flange on it i was planing on sending the turbo back to precision to get rebuilt but my question is has anyone ever changed the exhaust side of there turbo just for flange purposes?????? and whats the differnces between the sc60 and the sc61 i cant determine weather my turbo is a 60,61 ????????

Rod Short

Switching the exhaust housing is no big deal. You didn't mention what A/R your T3 is, what engine it's on, etc., but if it's a .63 A/R. you may want to considergoing to a .58 A/R in order to make up for the slower spooling characteristics. It's all a balancing act.

As for your second question, look on the outlet of the compressor cover and you should find some numbers scribed which will tell you what they are. If you can't decipher them, give us a call and we'll translate it for you.

Precision Turbo
(219) 996-7832 8-5 CST weekdays

REEMB18C1

thanks highly appreciated the a/r is .63 and the nums on the housing are 6152e im going to be runing this set up on a 84mm motor ls v will lowering the a/r still benifit me

Rod Short

The PT6152 was our top selling T3/T4 turbo last year. It's got a sweet compressor wheel and I think you'll really enjoy it.

Lowering the exhaust A/R from a .63 to a .48 will give you quicker spooling, but also limits top end power. That's nice for blowing off the tires, but it tiresome after a while for me, so I always liked the .63 on my 4-cylinder. Feeling that thing pull when most engines are on a plateau is a rush.

Don't be terrorizing the locals in Queens now, okay? <grin>

REEMB18C1

thanks ...so this means the turbo is a pt series and not a sc... i want the car to make power up stairs car gonna be moreless for the track occasionally for the street how much bigger on the a/r will i be allowed with this turbo... i wanted to go some what bigger for now since im sendin it back to get rebuilt

Rod Short

No, it's an SC series. Trying to do too many things at once.

You can go with a .82 A/R T3 exhaust housing which will open it up even more. This has a 4 bolt discharge side. The housing you have may be a 5-bolt, so you may have to change your downpipe.