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Ok im kind of a noob when it comes to rotary motors, but i do know that the Fc3s Turbo 2 came with a 4 port design and i belive 8:1 compression or in that neiborhood. The N/A motors came with a 6 port design and around 9:1 compression. Now i know if moderate boost is applied to the n/a motor you will face detonation issues. My first question, would detonation occur if running mild boost (7 psi, intercooled)? i know that people have run a Garrett ball bearing, at 7 psi on an 11.3:1 toyota motor and it has blown up (yet). so if i kept it mild would it be alittle bit more feasable? Second question is the 4 port design prefrable over the 6 port for the turbo application? i think the 13b-rew came with 6 port twin turbo, and i know the rx-8 comes with a modified 6 port design. Greddy recently came out with a turbo for the rx-8 as well. so which one 4 port or 6 port? Im really not to sure about j-spec port designs i.e. 13b-re, 20b, etc. any help is greatly appriciated, and needed for my build up. thanks guys please controll the flamage if any of what i said was wrong, like i said im a noob.
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The 6 port motor is not better than the 4 port motor. The 6 port design has problems with it. And the 13B-REW was a 4 port design, just like the 13B-RE, and 20B. Now on to your question about turbo charging a motor with the 9.5:1 compression rotors in it. It can be done. It has been done with great results. The tuning can be a little more tricky. There is a guy on www.rx7club.com who swears by it. He has put down anywhere from 475whp to just under 600whp running on 9.5:1 rotors. His handle on their is Crispeed. Just be ready to have your car professionally tuned and don't try to run this setup on a stock or reprogrammed ECU. PM me if you want to talk some more about it. I'll get you in contact with the people who can help you out.
Zach -
The 87-88 Turbo II's have 8.5:1 and the 89-95 Turbo's (yes the FD too) had 9:1. The 87-88's weighed 10lbs and the 89-95 only weighed 9.5lbs. 86-88 N/A was 9.4:1 and 89-91 N/A was 9.7:1. We have built some engines with N/A rotors from the 89-91, but Boosted is right, you must have a standalone EMS to support the higher compression, especially when under boost. I am running 9:1 FD rotors in my 89 turbo engine, and I am running an E11v2 Haltech ECU. I am hoping to hit the dyno next week, but with this setup on other cars I have built it should make an easy 525-550rwhp. The key is fuel management and higher octane fuels with higher compression. If you get a good turbo block, then you should be just fine for quite a bit of power to start you out and to help you learn the car easier.
Some good sources for FC only info are:
www.fc3s.org
www.clubfc3s.com
www.teamfc3s.org
and the FC email list at http://autos.groups.yahoo.com/group/fc3s_org/
Hope that helps!Comment
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nice info thanksComment
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