I know this has been beat to death. Please indulge me.

The turbonetics guy suggested going with a full T66, p-trim with a/r .69 or .89.

From the research that I have done a full TO4 with - p-trim exhaust and 1.0 or 1.15 a/r, and 60-1 compressor in a 0.7 a/r should do well in my car.

Still looking for a somewhat streetable car.

Any Comments on which turbo would be better for my '90 Turbo II?

Thanks so much!

 

I think either will work nice, its just a matter of how much power you are chasing ?

The smaller turbo will give you better responce while being limited to around the magical 500rwhp mark, the T66 is good for another 100rwhp.

 

Good info, thanks Rice Racing.

Does anyone have one of turbo's on a TII now?

Just wanted to know what kind of rpm the turbos will start to spool and when good boost is reached (rpm).

 

I've beat this to death also. I went with a T04B 60-1 0.7 A/R cold side and 1.00 A/R divided hot and P-trim. Heres the run down on this turbo.........

With a large street port and good tuning 450 whp is about the limit. 350-375 seems to be the norm @ 13-16 psi.

With a 1.00 divided turbine housing, and a good equal length tubular manifold and street port expect full boost by 3000-3200 rpm's.

With a .89 single entry turbine housing and log style cast manifold (very cheap to get a hold of) expect full boost by 3400-3700.

Can't imagine why anyone who drives there car "spiritedly" would ever dip below 3500 rpm anyway.

In top gear interstate speeds, full boost by 2k-2.7k.

These are the results I came up with after searching MANY threads and different forums and talking to several people running these set ups and simular set ups.

~Mike......