Last I checked there wasn't a Mazda in the texas mile 200 club. There are about 6 Supras though (excluding repetitions).

I'm surprised that none of the 20b's have made it down there.

 

Edit on my post supras *can do 200.

 

just you wait...

 

Mazdas that go 200 take off in flight havent you guys seen the videos? Thats why they tuned them down

 

that and the stock 4.10 ring and pinion only lets the car roll out to about 185/190mph @ 8500rpm...

 

I just used this http://home.netcom.com/~sgalaba/mph.htm calc to figure out what my top speed would be and got 202 MPH with a 255/40 R17 tire, .719 5th gear, 4.1 rear end.

 

At what RPM? But does that factor drag and that crap?

 

check this chart on rotary performance's website which shows what ring and pinion will roll out to @ 7500rpm....

http://rx7.com/store/rx7/fddrivetrain_rearend.html

 

I used to think 400's was plenty on the street. That is until i got bored with it and went for 500's. I think anyone that says 400 is all you need just hasn't driven with 500. That includes me earlier this year. I didn't originally want more due to the same fears of reliabilty, but after seeing a couple people running 20 psi on pump fuel and nothing else, and a handful pushing more then that on ai i decided i should be fine at 20-23 psi with ai. And so far it's held up great, i've put at least a few thousand on the motor and it sees full boost everytime i take it out. One day when i feel more "finished"with the engine i'll dyno it. I know it's over 500 but whether its low 500's mid or high i have no idea. But it sure is fun. Sometimes i set it back to 15 psi just to see what used to feel fast.

 

Not to be rude but if you havent dynoed it how do you know youre making 500+?

 

8000 rpm. Drag doesn't matter in a calculation like this, only for HP it would take to reach it.

 

I see that you have the 550/1600 combo. How are your injector duties? I want to push 500whp with the same combo. 850cc primaries are harder to tune and will consume more gas.

 

It's cool, and you have a valid point, there is really no sure way of "knowing" obviously. I've been building/driving/tuning/racing performance cars & bikes pretty much my whole life. I've owned this car for 8 years, had it dyno'ed before, and I know pretty much what setups do what in these cars. I'm not out to prove anything to anyone, I'm not chasing any numbers, but in my personal, humble, and honest opinion I can say with 99% certainty it's over 500. Plus, breaking tires loose rolling the throttle on in 4th gear at over 100 mph takes a considerable amount of power.

If I'm not over 500 @23 psi with a t70 and large ported engine then something is just not right. You'll also notice dyno results vary a fair bit depending on the type, corrections used etc. Anyone with an upper 400 hp car could find an optimistic dyno that tells them they have 500 rwhp, but is that really proof? Maybe enough for them, and some people, but then you look at the setup does it add up? Maybe, maybe not. My setup does add up. I would expect 535-550 at 23-25 psi, so all things considered I think 500+ is a fair and realistic calculation.

My injector duty's see a max of around 82%, but I'm running higher base pressure, and dual fuel pumps. I don't think a single supra pump as an example would be enough to get 500 out of a 550/1680 setup. I don't think it would keep up with pressure demands.

 

You can get desensitized to almost any level of horsepower. I had a friend with a gutted Vr-4 running twin evo 3 16G turbos. I'm guessing it was pushing mid to high 600s because he always ran race gas on the street. It was basically a 10 second car on **** tires because of the AWD. He ended up tearing down the motor because the car wasn't fast enough for him, but then had to abandon the project when he got laid off.

the real problems, as I've said before, are that the car becomes too dangerous or too illegal once the power gets high enough.

 

dudeman - are you running a parallel fuel system with dual pumps or just running them inline? Just curious bc thats my project for the week... installing a parallel system-

 

Parallel. They are mounted next to each other on the fuel pump carrier, and both feed into a Y which is connected to the stock supply line. Here is the writeup I did.

https://www.rx7club.com/showthread.p...highlight=dual

 

FOR SURE 500hp isnt even going to get you past the the srt neons. The average car here is running 600 or more (and thats average)

 

NC is the HOME of the worlds quickest and fastest neons- 500 whp in an rx7 will let you (out)run nearly all SRT's unless theyve had the complete darrell *** racing makeover - The D *** racing world record for a street srt4 is 9.16 @ 168.5 and that took nearly 900hp on the "red sled"!- I highly doubt a neon with 300hp less than that will roll out anywhere near that fast... I think ARI's rx7 makes around 650-675 with the nitrous and runs 9.27...

http://www.dcrsrt.com/index.php if youd like to investigate how much $$$ it takes to make an SRT 4 cut quick e.t.'s...

 

There is soo much cludder rumors and crap in this thread. There is no "safe" hp rating for our engines. You could have 300rwhp and blow your engine and have 600rwhp and not blow. On the street its how much you feel safe with and if its too much turn it down and turn it up at the track(dont go killin your self since you will spin 2nd or 3rd). On a street car what is going to save the engine and make it more reliable is meth injection(50/50 mix) which will cut down carbon build up due to street conditons. Also dont baby it, take it to redline once in awhile to kick in the injection and get rid of build up. Major thing is the TUNE. If you dont have a safe tune(not the most hp you can get out of it) but low 11's AFR's. Also on the build it is a very good idea to have it clearanced and balanced for higher hp engines(like 450rwhp+ good idea on all rebuilds though). Its all in what you want to do with the car. More hp more turbo lag, less mpg, and easier for damage to occur due to added load on parts(not saying it will blow). I have 475rwhp and enjoy it on the street(lots of kills) and is safely tuned(low 11's Afrs) and runs 10.6-8's with a/c and all. Enjoy