Okay,here's the deal,I'm wondering if anyone has built a turbo motor with N/A rotors?I have a 93 fd motor and tranny I'm going to build for my first gen,it has a bad side seal so I have to re-build it.I have the complete wiring harness,stock twins,intercooler and everything,
but I would like to keep the torque I have now.My basic idea is to port the housings(street)run N/A rotors and 10 to 14 psi on the stock twins,This should produce equal power to a high boost low comp. motor but with tons of bottom end.I know everyone says low comp. high boost,but piston guys do it all the time.If I add fuel properly and regulate boost it should work.The main reason for the turbo swap is for noise control,cause the cops hate my N/a noise and its $80 a ticket.Please any info would help.thanks

 

you can use the 9.4:1 n/a rotors in place of the t2 one without too many issues. There is not *that much* of a difference between 9.0:1 and 9.4:1 cr.

 

What kind of compression are you looking at? 9:1 10:1 11:1? I don't know the compression of N/A rotors right off hand. An sr20de from an SE-R can hold just at 20 psi with a 10:1 comp ratio before stuff starts to happen. But you dont wanna be anywhere near that for street use. I would say a rotory would be about the same. You would definately run into detonation from poor fuel quality (ie it would have to run on around 100-110 octane), I also wonder about the integrity of N/A rotors, would the pressure be more than they could handle at 10-14 psi? I do know that an engine built specificly for boost will make more power than an N/A engine with boost added, but I understand the low end torque thing. I would start out at 6-8 psi of boost and keep a good check on detonation, and increase boost accordingly.

Dont know if I helped any, but at least I tried

-E

 

76 RX4 13b twin turbo N/A rotors. at frist it was a single turbo for 50k mi, then the up grade to twin and fuel injection, high test gas and timeing, been over 20 years now, so what's the big deal?

 

well ive read a lot on here and i hear "soon ill get hi compression rotors and i can run more boost" i only know about piston turbocharged engines...and low compression is the key...so is it different on a rotary???

 

still the same on both piston and rotarys. back in my corvair days I had a 110hp with a turbo. the 110hp had the highest compression of all the corvairs. Good gas and feel as you go for setting the timing, ask that off duty cop I was racing.

 

yuh sure
just tune it good

 

Thank you for the responses so far.I will keep checking for more.

 

Ralph Friend of Groundzero motorsports is going to be running the new Rx-8 rotors in his turbo motor. Last I heard he was running a T-72 (not shure if it was a q or P trim?) @32psi. CJ

 

I was going to do this same thing for my 88, but has been put on hold.
The thing I think makes a difference when compared to a stump puller is the side of the rotor housing. If the pressure exceeds the strength of the housing, you are going to have a quick and expensive show. I was going to get the motor doweled. There may be other things that can be done to improve the strength.
Good luck, keep us posted.

 

compression creates heat. You can either let the turbo compress the air and let the IC take it out, or let the engine compress the air and leave the heat in.

I've NEVER seen someone say they are going to raise their compression and run MORE boost.

 

Im looking to run high compression (9.7:1) + 1bar'ish boost. I figure running the lower boost will let me find a turbo with more efficiecny which ofcourse will heat the air less, hense lil more power than if i ran low comp with crazy boost

 

From what I understand, Ralph wanted more bottom end, while off boost. CJ

 

*sticks hand up* Over here! Compression is 9.4, going for 12+ PSI this spring...I didn't necessarily raise compression, just left it high.

I love the high compression engine. Plenty of low end, and boost response is instant. Full boost by 1200-1300 RPM.

 

Yeah chalk up another one here!
Motor is currently getting rebuilt but once again in a month or two it'll be yet-another-highcomp-6port engine.

I second aaron cakes comments about full boost comming on _very_ early!