North American Turbocoupe Organization

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I went out and picked up a T3 to replace my IHI. I got it from a 86 TC with a 5 speed (rebuilt). Dave at Tiny Avenger told me to make sure the rear housing has .63 stamped in it. I got the .63 but another guy just told me that I should continue to use a .48 rear housing. Who is right. Need to know before I install it.
It doesn't make any difference as far as installing it. I have the .48 on my 88.
The .48 spools a little quicker than the .63.
The .63 probably makes a little more power on the top end.

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88 TC X 2, 86 SVO, Main TC with K&N, 3"DP to 2.5"duals through Dynamax, Ric valve at 17+ and disconnected KS.
Elite Bodega 16" chrome wheels. Autometer pod w/ A/F and Vac/boost gauges.140 mph Motorsports Speedo New engine: Total Seal rings and TRW pistons, ported and polished head w/ cc'd chambers,1.59"exhausts, SS valves, gutted upper, knife edged lower, A-230 cam, Race Engineering Adj Cam Sprocket, Crowlers, ARP head studs, and rod bolts. Walbro 255 HP pump and Kirban adj FPR, T-3. Centerforce II, KB subs and jack rails.

[This message has been edited by Pete D (edited 09-30-2001).]
I know installation is the same, I just want to make sure I am getting more power. With the .48 having quicker response at what RPM range does initiate boost and at what piont do I reach max boost? By going with the.63 does that mean I will generate more top end power with a not so noticeable low end loss?

Noname

If you got it off a 86 TC then you have a .63 ar exaust ratio. As for more power the difference between the 2 is very small, you will notice a big differance btw the ihi and t3. But if you had a choice i would go with a .48 for street applications. and for boost levels under 20 psi.