I called the rx7.com people the other day, because i was thinking about taking my car to them in january to be retooned for maybe 19 or 20#'s im only running 15# right now, anyway he told me that you really couldnt run more than 15# without running race gas safely, is that true, whats the most that you can run on 93 octane. I know that there are people running more than 15 on the street without race gas, i wanted to run like 17# low boost and 20# for high. just curious. (sorry about the spelling i suck at it) thanx.

 

17 PSI is a good limit. That's what I've been limiting my car to.

 

What kind of horsepower are you makeing with 17# i wanted around the 450 to 480 mark how much boost would i have to run to make those kind of numbers. thanx.

 

I'm actually not sure because I haven't dynoed my car yet. I'm sure it's making over 400 because it's alot faster than my friend's 2001 Corvette. Usually a T-78 kit on a 3rd gen with the right tuning will give you about 450 RWHP at 17 PSI. The usual number for 15 PSI is 425 RWHP.

 

450 would be good, but what i want to know is how do all these people on here that say they have 500 or more at the wheels do it, i know they dont go and fill up on race gas every weekend, or is it they only push that much boost at the track.

 

You sure about that?

 

Most people with 500+ at the wheels ARE using race gas to get those numbers, and even nitrous. Remember, those are numbers on a dyno. When getting on a dyno you want to show off and make as much power you can. So you will try every trick in the book. The same thing goes for the track. If I ran my car at the track I would drain my tank and throw in C16. Hello 25 PSI!

 

i run 20 psi on 93 and 28 on c16 and the last time i went to the track i ran 30 psi with 100 unleaded no problem. t88 fd and you don't need ice to make 500 with a t78 maybe with a cheaper brand you do

 

can't wait to take advantage of the 110 at the pump hehe....and oh yeah it's 5 miles from me

 

if i were you i wouldnt push more than 18 on pump..at least thats what my car is gonna get tuned at for its limit. Anythign after that your asking for trouble....What kind of gas do you guys all run with anyways c-10..c-12..c-14..c16???etc etc and has anyone played witht he performance unleaded fuel?

 

Hahaha Some of you guys are hillarious!

I think a lot of people are forgetting a few things.... Where do you live? Well, what do I mean?

For example. In Texas, they have some nice 93 pump gas everywhere you go. Here in Kansas they have shitty 91 octane. Make a difference? Hell yes it does.

So, you ask how much boost can you run. Well, you can run 1000 psi on 79 octane. Oh wait.. You want to know safely. Well, the fact of the matter is everytime you force air into your engine with pump gas your playing odds. It may be favoriable at times, but not so favoriable at others.

Many of the Texans run 17 psi on pump gas. The 'faint heart' ones only run up to 15 on pump gas. Its all about risk and odds. Feeling lucky? Try what R1DREAD does. I would recomend that you make sure you have a nice 6 grand in the bank (4 grand for new engine, 2 grand for new turbo since it will be eating apex seals very soon).

Do you have a money tree in the backyard? If so who cares. Run 20 psi. Honestly, I don't think Ari or Chris, or Solo would lie to you.. Would you?

Another thing you can do is mix the unleaded gas. Since we have crappy 91, I always put in 5 gallons of 100 octane with it. This mixes it up a little and raises the octane to something pleasent.

Mike

 

Run over 1 bar if you want to you're motor.....

 

don't forget the factor of ...... "I just popped my motor running 18 psi of boost that YOU said I could run" ....... gee, I don't want that hanging on my rep either!

 

Are you guys kidding me?
T78 ,e6k,ported motor and you can't run 20 psi i would sell it .Supras and 3Zs would eat you they make 600+on pump.
If you have seals from across the pond you will not damage anything. my advice is to dump the e6k,get a motec .
why you ask. onboard datalogging for as long as you want.not one run.get lambda and tune it you self .

 

R1DREAD, an rx7 with less HP will outrun a supra and 3z with more power, to a certain extent of course, i mean i dont expect a 400hp rx7 to outrun a 800hp supra but an rx7 with 450hp racing a supra with 600hp the race is going to be close, power to weight. Supra and 3z are heavy, rx7 is light, but anyways back to the subject, im asking, it is possible to run on 93 octane up to what boost, most people seem to say anywhere from 17 to 18#, is that the most, and how much HP can i expect with my setup, i understand i can run more boost on race gas but i want to know what i can run without it, right now its looking like 17 and 20 for the track with race gas, does that sound good, and some what safe, how much HP with 20# would i get.thanx for the response

 

I do not have a T78 i have an 88 and i ran 20+ before on 93.
But you have to listen to your tuner, before you go to 20 i would have them tune it to 20.
My brother has a Supra with twin 25G's750+whp and i beat him 4 times already. if i ran 20 he would smoke me.

 

R1DREAD-

I don't think anyone is disputing not running over 20 psi. The fact of the matter is, you don't want to run 17-XXX Psi without racegas/very high octane.

Mike

 

R1DREAD how much were you running when you ran the supra and was it on 93 octane, and i know it has to be tuned thats why im going to take it to rotery performance, but when i talked to them they said they did not recomend over 15# without race gas, that it wasnt that safe, and if you are running such a high boost who tuned your car, and what did they recomend, didnt thay say it was dangerous running such a high boost on pump gas. plus how often do you come across 750rwhp supras just seems to risky for the money running such high boost on pump gas, maybe 17# and 25 on race gas is a good number but only 25 on race.

 

I used to run 21psi on the street everyday with 93 Octane gas and a T88 turbo with no problems, I was kinda forced into the situation because my wastegate was a old Type C from Greddy and came with a 21psi spring in it, yes I know you can change the spring, but at the time I needed to drive the car everyday and I couldn't wait for the spring to arrive, so it got tuned that way and I had no problems with it. When it comes to running boost, octane is one of the real big factors in the equation, for 93 octane I wouldn't go any higher than 22psi, cause no matter what you do, it won't be safe. Any boost higher than that will require race gas. Just my 2cents.

 

I have been hitting 19-20 PSI in my car for the last few weeks on 93 octane due to my boost controller acting up. The car ran really well, but I was still a little worried. I've always heard everybody talk about 17 PSI as a limit. It was fun, but I don't want to learn the motor's limits the hard way. I fixed the problem, and now I'm running 16-17 PSI.

 

When i ran my brother boost was 29-30.high hp Supra's are everywhere "TO4R.com".
I tune it myself bought a wideband and started datalogging, i have 4 1600cc injector so no one has a map thats even close. every one says they are on 850+1600 .
Next thing i'm going to hear is that you can't run with Supras on the topend,or that you can't hold it flat out . i ran 19-20 psi on my stock twins and went 124 in the 1/4 . i love racing i have guys with mustangs runing 2 stage ice challenging me when i go to street night ,ran 27psi and went 11.1@133 with a 1.8 short time.

 

Finally: Someone else with 4 1600's.

 

I used to run 4 1600cc' s also, you need it to run high boost or the alternative is well...............KABOOM. Everyone knows rotaries LOVE fuel.

 

How did your car run with them? Mine seems to idle alot better at 1000 RPM than 750-800 with the 1600's.

 

Your right I've not heard of too many people with 4 1600's. What is your complete set-up. I'm not doubting you but 11.1 on stock twins seems pushing it.