To build with NA rotors or not to build?
 

I've got a blown reman my 89 TII came with. Took it all apart and the rear rotor is blown. Housings look brand new BTW... Well I've got a bunch of s4 NA rotors laying around doing nothing. Would it be a good idea to build my engine with the NA rotors or just try finding another s5 TII rotor which are hella expensive? BTW I will be doing a very large street port on this engine using Judge ITO's porting templates.

from what i hear the compression #'s are about the same right? i dont think the rotors match the housings tho.

how much power are you looking to go? The N/A rotors will work to a certain point, but if you're looking to go 300+, you might be pushing it...

86 - 88 Tii = 8.5:1
88 - 91 Tii = 9.0:1
86 - 88 N/a = 9.4:1
88 - 91 N/a = 9.7:1

i would like to know if that would work , and that ITO template is tight

Well my setup includes a stage 3 BNR turbo. Then I also have a wolf3d v.4 to run it all. 550cc prim and 1600cc secondary injectors, racing beat full turbo back exhaust, and hks intake. Would this engine be fine with this setup you guys think?

I would like to run upto 15psi of boost and looking to make about 350rwhp.

The rotors will install without a problem, the question is of course tuning and keeping from detenating. I actually plan on rebuilding a S5NA engine and turbo it. It should be done by spring.

thats a lot of compression for a turbo engine!

Yes...yes it is. Hehehehehehe :D

liked how you answered that..haha!

As long as you can tune go for it. Get a fmic and water injection for safety.