frankenseven

My best run so far is an 11.06 @124 mph. This was done on 28x9.5 Hoosiers @12 psi (tire pressure, not manifold pressure). My 60' time was in the 1.60's. I was recently referred to this site by a friend, so I haven't seen alot of the other V8 setups around. I would really like to hear from some you guys about how you are getting off the line. I can't seem to get away from the lights clean. I think I could dip into the 10's if I could hook up.

turbogarrett

iTrader: (1)

Nice time! What's your setup? For me, slipping the clutch off the line seems to work the better than dropping it, but I am running m/t radials.

frankenseven

I have a chevy 383 with a TH-350. Not too much fun of the freeway, but good for the track. I made some suspension bushings the remove some of the rear camber to plant the tires a little flatter, but if I take all the camber out, the tires rub on the launch. Maybe this winter I will have to spring for another set of rear wheels with more backspacing.

This is a photo of my best launch so far (best 60' time anyway). Too bad the light was red for this one.

2MCHPWR

iTrader: (2)

went back to track and got 10.97 at 127!!!

http://www.ponycars.net/atco1097.htm

frankenseven

Nice time! I'm jealous. Seems like you might be able to drop that time even a little more yet if you have the power to get to 127 mph. Do you know what your car weighs?

2MCHPWR

iTrader: (2)

2730 lbs, thanks!!

nopistons94

this is possible with a non turbo 4 rotor or a turbo 3 rotor with less boost

Nihilanthic

Yeah they can, no doubt about it, but compare prices. 20bs are expensive as hell... 26bs are "if you have to ask you cant afford" expensive, in other words a lot more. And on top of the engine expense, getting power from the engine will take more money too. Its just part of the game. Wanna play, gotta pay.

Anyway, assuming you do get a 26b, you have the equivilant of a 5.2 liter piston engine. Thats the low end of displacement in the v8 world, so it would all be dependant on the turbo.... and youd be spending a ton of money to get there, while buying a dart 302 block with a 4.125 bore (which would give you a little over 5.2 liters with a 3" crank) would clost a hell of a lot less than a 26b and give you all the strength you'd ever need, even factoring in the cost of a crank, rods, pistons, pushrods for super high revs, and some hogged out heads. And its more efficient at combustion because its a piston engine. And, its a lot more reliable under boost and resistant to knocking.

Furthermore, thats the low end of the v8 displacement spectrum... and the maximum of the rotary spectrum. A 20b with its 4 liter equivilance would need more boost than a v8 would to make the same power. I mean hell, a 6.6 liter LS2 recently put down 500 whp without nitrous or a pound of boost and a mild cam. Small blocks can reliably reach 7 liters displacement!

None of us ever said a rotary cant do it... we just would rather do it cheaper and more reliably, with a different engine.

wingsfan

26Bs were NA in the non-Gran Turismo world. They made around 700 bhp and 450 lb ft of torque. Not too shabby. Of course, the million dollar price tag isn't palatable either.

Somewhere around here there's video of a Kiwi custom 4-rotor pieced together with 12A parts. It's pretty damn fast too IIRC.

Anyhow, you shouldn't feel like you need to slag the rotary in every thread you post in. Most everyone realizes that the modern V8 is a great powerplant choice (even in a 7). And you're never going to convince the zealots/purists that it's a good idea.

digitalsolo

iTrader: (2)

Indeed, the R26B was definitely N/A. With variable length intake manifold and some other snazzy things.

Grant from Granny's Speed shop built a 4 rotor I think. Ran it in dirt oval racing.

Of course a 4 rotor is damn near the size of a V12 length wise, so installing it would be a PITA in anything that wasn't tube frame.

I want one in a Go-Kart.

Mas280

v8 rx7 video

http://videos.streetfire.net/player....9-4C5C0B7EC8C7

Nihilanthic

Umm.... You're telling me you'd want to take a 5.2 liter 26b N/A to 9K rpms for anything but a absolute RACE car if youre going to spend that much money anyway? Eh, I guess **** idle and low end is part of the fun of blowing 20K.

Oh, you think this is because that video game stuck a turbo on it. Nice try, but I figured someone would rather not try to play the N/A game with an engine thats not even the equivilant of a 327, when everyone else has more displacement to play with. Unless of course you think a N/A 26B at 1000 whp is a good idea... that IS what we were comparing to, right?

Regardless, Im not 'slagging the rotary'. Im telling them what it actually is and the realities of it and why people like me make a decision to not stick with the stock engine of that platform. Its not "slagging it" to state a simple truth such as it costs more to get something out of it, its not as reliable, and how much displacement it has when compared to a piston engine, now is it?

Maybe its my tone. I should work on that. But Im not going to accept that Im 'slagging' something by saying what it actually IS. Id much rather have a stronger motor that can knock and not need a rebuild and cost less to get more out of, because I dont care about ignorant misconceptions about american engines!

Also, you should ask mr "turbo 20b or 26b could do bla bla bla" why he popped into a v8 quartermile time thread to say that.

wingsfan

I think you know where I stand on this one, there's an LS1 in my car after all.

You're the one that brought up a turbo in the same sentence as a 26B. I merely pointed out that they weren't ever turbochraged (except in a video game).
Have you ever even actually owned an RX7? Or a rotary for that matter? You spout off an awful lot about the "realities" considering your apparent lack of experience.

As for "people like me make a decision to not stick with the stock engine of that platform" I assume that you mean people with nothing but internet experience and dreams that like to chime in on every conversion thread they can and annoy the crap out of all parties involved?

Maybe you're just an *******, and you should work on that.

Blah, blah, blah. You have to realize that some people like the rotary, even with its shortcomings. Most of our swaps are purpose built, and not every RX7 owner is going to agree on the "purpose"

Pot, meet Kettle.

Nihilanthic

Hey, Dru, do I have to hit my dick with a hammer to know it hurts?

wingsfan

If it would get you to behave I'd be all for it.

And if you've never actually hit yourself in the dick with a hammer you'd still be working off assumption.

Nihilanthic

I assume constantly backed up, constantly re-verified evidence is as close to empirical as I can get in the whole car modification paradigm, so thats what I go by.

I dont have to hit my dick with a hammer to know it hurts, I dont have to own a rotary if other people have worked on them and enough of them are in agreement on the costs and reliability of it to know its expensive and prone to the thousand-dollar knock.

I dont have to perosnally dyno a rotary and a piston engine to know the differences in efficiency if 1. the math adds up 2. theres enough people in agreement about it 3. ive seen evdience myself.

So yeah, logic can tell me a lot, so can educated opinions Ive come accross, so does the math and theory, and so does simply browsing Torque central vs here in terms of performance and reliability, albeit its anecdotal.

I dont want to spend more and get less, its that simple. I also dont want to have to risk needing a rebuild if I knock! Its not shitting on anyone or anything, its taking the economical decision thats best for me.

Now, unless you want to have a discussion about epistemology, or hit our dicks with hammers, can we get back to how fast v8 rx-7s are in quartermile runs?

digitalsolo

iTrader: (2)

Actually a good sized ping will blow the ring lands off a piston as well. I've got 4 GM 3800 engines with chunks missing from one or more pistons from detonation. A boinger isn't immune by a long shot.

Nihilanthic

I never meant it would stand up to it eternally... if I took ANY engine and pinged on a hot day under boost going up a hill Id most likely **** **** up, but a ping on a dyno because I got too lean or too aggressive with the spark while tuning or got some bad gas wouldnt necessarily mean ID need a rebuild. I could go "oops" and pull spark, or add fuel, or drop boost.

Yes, bad pings will blow out virtually anything. But a ping that would ruin a rotary would be shrugged off by a piston engine by virtue of the design.