Isphius

What RPMs do the stock s4/s5 turbo motors turn? I want my car to just make massive high rpm power, wave off the low end. I still want it to be driveable, but, basically a dirtbike powerband. I know how to do it with pistons, but what does the rotarty heed? im guessing a lot of port work...But what supporting mods would help me with highend power?

RyoFC3S

iTrader: (1)

Porting will do the most significant high end... http://www.mazdarotary.net/porting.htm

Is this for an NA or turbo? Big difference...

snowball

wait....
did you say rotary head?

there is no such thing as a head in a RX-7, the ports are on the block itself.

anyway search theirs tons of info on high-rpm builds.

misterstyx69

iTrader: (142)

HEED..(haha!)..Layman's terms .Requires...and There is Way too much info on this.Use the search function,and punch in stuff like Fuel modification.Porting,Beefy N/A thread(may not Pertain,but it is a good read!)..Even just browsing through the new threads will reveal Vast amounts of Info..after all you ARE on the BEST Rotary Forum on the Internet!

My5ABaby

iTrader: (7)

For a turbo'ed car, you don't need high rpm's to make huge power.

He said Turbo.

He said heed.

He probably meant need instead of heed.

Aaron Cake

iTrader: (1)

Search for "peripheral port". Or a little tamer, "bridgeport".

Isphius

yup, i meant need. The problem with me using the search feature, is i dont know anything you guys are talking about with rotarys, so even if i find the thread, i dont know what is going on lol. And are you aaron cake from the aaron cake site? Your site made me want an rx7 haha. Thanks for the info tho, im gona look up the bridgeport thing now.

takahashiRyosukeFC3S

yes that is THE aaron cake who provides alot of us with good inspiration. (thank you AC) if you want a powerband like the old CR250 from honda or any dirtbike like that, you can shoehorn in a large turbo. it takes a while to spool up but kickes you in the @$$ when it does come on. not sure what you are looking for but check around the "single turbo section" from the front page of this forum. some of these guys in FDs and a few FC i think are making in excess of 600 - 1000BHP. big turbo, big porting job, boost comes on late and kicks you around.

hope that helps.
TR

Isphius

Yes, thats exactly it, but i dont want 600 hp, maybe in the future. I was thinking more like 300. lol. But yeah, a cr250 powerband would be nice!!!

takahashiRyosukeFC3S

then check out the single turbo section. you're going to be dumping about 4k into this car on the low end.

ANYONE GOT ANY PRELIMINARY RECOMMENDATIONS? GT35R, GT40R ? any large turbos? or maybe one of the NOPI sold HKS or Greddy Turbo kits?

I hope you will get what you need,
TR

Sideways7

iTrader: (7)

Why do you want a narrow power band? All it does is hurt performance. If you want the revs, then that is also mostly pointless and pretty expensive once you start doing all of the supporting mods. There were several threads recently on raising the redline on an NA engine and the general concesus was that it was a huge amount of money for very small gains unless you had extreme porting. On a turbo engine its even less useful except in certain race engines since you can just put on a larger turbo for more power. J-rat is making crazy power and only runs to 8k, if that.
To make power much past that you will need a bridge or peripheral port as Aaron suggested, but that's some serious money, especially for a p-port.

arghx

iTrader: (3)

You're also going to need racegas or methanol. A big turbo doesn't really come alive until 20+ psi.

Isphius

I dont think im conveying my though correctly, its hard to explain. Youd have to go for a ride in the car in my head! lol. I guess im just thinking of a modded turbo motor, but ill just figure out on my own cause i realized how dumb of a question im asking, thanks for your time guys!

takahashiRyosukeFC3S

the only dumb question is the one that you don't ask.

TR

Isphius

Haha, maybe true, but there is some dumb questions out there. But I basically figured it out, I want to the car to pull till redline, and not care for bottom end. Like basically if you put tunnel rams and 2 4 barrels on an otherwise stock 350. lol.

Rotary Noob

^^ that would be fun.

Im still learning about them doritos, but I want to raise the redline (not to 10 grand, I read the other threads) but to about 8.5 or 9, and give it some higher gear ratios, so that i can have less power and pull a bit harder/longer with the power i will have. 4.5 in the rear, and start from 3 in the tranny.

Good luck with your motor, hope it turns out well.

Aaron Cake

iTrader: (1)

Simple question:

How much power do you want to make? Forget about powerbands for now.

Isphius

ballpark about 280 rw.

Isphius

I also meant to say my supra is making about 300, and it has to be faster than that. Im sure it would be easy cause the rex weighs about 1500 lbs less than a mk3.

Aaron Cake

iTrader: (1)

280? That's it? Most of the hybrid turbos will easily do that and you can get by with minimal fuel mods (bigger secondaries, S-AFC, upgraded pump).

Isphius

ah, exactly! lol. I want to keep it relatively close to stock. What will the standard intake/exhaust/mbc combo ad? I may be buying that 305 rwhp car in my WTB thread though, so I will already be there lol. My supra has a 3 inch turbo back, steel IC pipes, ported wg housing and it goes up to fuel cut at about 14psi without even having a boost controller lol. The stock turbo will not last at 14 psi thou, its at its limit already. It is a brand new factory turbo thou. I remember reading yout na-t website, how is that going?

Aaron Cake

iTrader: (1)

You will need the upgraded fuel injectors I mentioned and then some way to control them. The stock TII injectors are only good for 250HP or so (more or less). Aside from that a full exhaust, intake and boost controller (manual boost controllers suck) will do the job. Also you'll need a FCD (fuel cut defender).