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'91 TII build for 400hp send help

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Old May 28, 2026 | 08:58 AM
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From: Oklahoma
'91 TII build for 400hp send help

Hello all, first and foremost I want to thank all of you for your knowledge and passion for all things rotary. I've been reading and reading and learned so much, thanks to you.

Now for the grit.
I've had this 91 for 8 years, bought when I was 18 for 5k. It was originally an na chassis and the seller did a full TII swap outside of the differential. All kinds of goodies, haltech 1500, fuel cell, fast fuel system, big injectors, ls3 coil packs, an egregious harness, large street port, goopy apex seals and extra parts. Drove it for two days after I bought it didn't check anything cause I was being a hot boy in a half built drift car... wrapped out 3rd, grabbed 4th and was atabout 7k and something happened. Turbo feeder line had come off and my turbo let go and decided to see what the interior of my motor looked like. Since then its sat at my pops' until about a month ago. I finally got space and tools to work on it.

i didnt have a real idea of what went wrong this entire time until i started removing components. Tore the whole thing down, made my own adapter for an engine stand, making stuff happen. Upon teardown I found both housings have some real good gouges right above the exhaust ports where bits of my compressor didn't make it out in time. Also both rotors are scratched, goopy seals are intact. But the worst part is both rotors channels for the apex seals are pinched, had to pry 4 of them out, legit only two moved freely in the slot. And one corner seal is part of the rotor now as I do not want to cause more damage.

I acquired another 91 NA 4 years ago that is bone stock and runs to this day. Originally planned on robbing housings from it, (still am) and re sealing everything and making a harness and doing it right this time. Had dreams of getting a new turbo and getting everything in check. Was looking at a psr3582 and getting DW injectors and try taking a Crack at tuning. Until I really inspected the rotors.

My main question, if i use the NA rotors and run lower boost could I still safely achieve 400 with some reliability? Do I machine the TII rotors for 3mm seals? Or do i wait and spend turbo money on new rotors?

At this point im looking at dowelling the motor just for the sauce (if I use the higher compression NA rotors) my pops and other family members are machinists so i plan on doing it in house. i know it can be done, but here in oklahoma 93 and true e85 are hard to come by, and that will drastically change my tuning and accuracy in control of the motor.

Had plans on it running this fall but now I have too many paths to choose from and my wallet is already having negative thoughts.

Im really just looking for suggestions, do I send it with a high compression motor on low boost, or do i wait till i can afford new TII rotors and play it safe and go with the original plan? I now know I will have to learn patience with this but my main concern is having a reliable WEEKEND warrior. 400 I feel is an attainable number and would be plenty rowdy enough for me. I just need some more experience, knowledge and suggestions. Thanks!
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