Is it possible without WI? I mean "possible" before start chewing some seals . I mean if you have good fuel system and other supportings, is it doable? Reason I ask is, one local guy swears that he runs that much psi on pump (around 590whp) and he said its all about how much fuel you can deliver. He even said that 2 walbro are not enough to support 25psi.

 

Yes without a doubt. The real question is reliability

 

Yep! and reliability means AI if you want to push huge numbers.

and AI means this Thread:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/making-case-rotary-powered-fd-fix-806104/

-Mark

 

He was asking about running 26 with out AI, I think he referenced it as "WI" which I assume to stand for water injection..... Even so, with or without AI / WI / MI whatever.

 

No.

 

It can be done no doubt, but how long would that really last, and would you really want to chance it? I can't say that I've personally run 26 psi on pump alone, but from everyone elses trials and errors... and there's been enough of them, the general sensus is that those sort of of numbers on pump alone will only cause bad things to happen.
Now, I'm not one to follow the norms myself, but as far as this goes... I'd go with an AI kit of some sort. (which I do... 620 rwhp at 24 psi and meth injection, NON- HD for now;-D)

 

Not on pump unless that pump happens to 118 octane ha ha


93 octane burns much faster than race fuel , higher boost levels increase temps, increased temps cause the low octane fuel to ignite when it's not supposed to, engine blows. The end.

If your friend is telling the truth about no race gas nor A.I. I believe that he is leaving out crucial info. For example I know of people that shoot N20 through (not in) the IC to super cool the intake temps. Which allows for higher boost levels than the average setup without AI/race gas. To say that all he adds is pump fuel + tune with no other support system to keep the fuel from pre-igniting, is just stupid.

 

26 PSi on pump gas and no AI will cost you a few seals, rotors and housings, and your turbo too.


thewird

 

Yep. Sorry, i didnt see the WI. lol. and no way you could do that. It would be difficult to run 17 PSi on 94.

 

The simple answer: No. Theoretically you can do anything you like, the question is, however, how long do you want it to last?

 

If no AI, then about .6 of a dyno run, lol.

 

17 PSi is safe on 94 as long as your not running lean for that boost level or too much timing. I ran it for multiple times at the track at 17 PSi before I went overboard with the AFR. However, I still wouldn't recommend over 16 PSi since things have to be perfect after that point

thewird

 

he is 90% lying, 10% bullshitting

 

I just thought of something. Is he running those 26 PSi on a rotary? It might be true on another car hehe.

thewird

 

That is what I though as well. Imposible! Thing is that this guy is very respected in this area. He builts rotories for life. He also has rx-3 running 8 sec. No joke here. I was looking at his boost gauge and I was looking under his hood. 26psi no AI. Only thing I couldnt see was fuel (octane level). He said its on pump gas and I dont see reason why he would be lying. All he saying is, if you got enough fuel there should be no problem, maybe i should mention he has 4X1600cc injectors. T04r turbo and 590whp...... Something doesnt fit, thats why I wanted to hear what you guys think.

 

Maybe its E85 pump fuel, aka ethanol ^_^

It would fit the huge injector description since you need ~33% more fuel for the same afr.

thewird

 

Thats prolly the most likely answer to the riddle...

 

yea.... but if you drive the car regularly (as commuter/dd/weekend warrior)... E85 wont exactly make sense. But if your tracking it/going for big # then obviously your fine.

 

interesting why that is....EVOs run 26 psi on pump all day as far as I know, or at least 22

 

Different CCP's.

thewird

 

I wonder how combustion chamber temps compare, too

AI to the rescue! the almighty HOWARD/BRIAN CAIN "FIX"

lights will guide you home, and ignite your bones...and I will try to fix you

 

Higher CCP's (combustion chamber pressure) = higher combustion temps as well which is the reason we can't run more boost.

thewird

 

Is it possible to lower the compression by cutting some meat from the rotors?

 

you can get lower comp rotors, like TII rotors, there lighter too.

 

Did you ask him how many times a week he rebuilds his engine?