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#1
06-26-2003, 05:15 PM
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RX-7 Engine
 Hey i own a 1994 Red RX7 TT and was thinking of the new Renesis Engine in the RX8 and all the other rotary engines that work in the RX7 and was wondering in your opinion what the best engine for the RX7 is?
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Wanted: 1988 Ferrari 328 1996 Toyota Supra TT 1967 GT500 1995 Eclipse What I Got: 1990 Ford Temo 
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#2
06-26-2003, 08:49 PM
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1.) your profile says you own a 1993 with a VeilSide Body Kit? Veilside bk's are junk...
2.) if you can find a renesis, it would be an awesome engine to put in a third gen. I'm going to do this in a few years when dumbasses start wrecking their RX-8's, but until then, the engines are going to be a lot of money. But with your car list, that doesnt seem like a problem for you.
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#4
06-27-2003, 10:42 PM
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I say keep the engine you have or buy another one just like it. The Renesis engine will probably be more reliable, but I'm not sure it has been proven yet. Even if it is more reliable, there are still no turbo's. I think the Renesis is an awesome engine, don't get me wrong, but it needs a turbo or two. That is just my opinion.
One more thing, doesn't the 93 TT engine have more hp stock than the Renesis??? I have it in my head for some reason that the Renesis has 250 hp, correct me if I'm wrong, but doesn't the 93 TT have 255 hp stock??
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2000 Honda Civic EX 1986 Mazda RX-7 GTU
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#5
06-27-2003, 10:58 PM
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Quote:
Shouldnt that tell you something? A n/a engine has only 5 hp less than a twin turbo engine... Slap an exhaust onto the renesis and you've got close to 300 hp.
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#6
06-29-2003, 03:08 PM
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Yes, this is true. The n/a Renesis has only 5 less hp, and with an exhaust, I'm sure it is possible to get close to 300 hp. But...here are my thoughts.
Turbo engines have more potential than n/a engines. A BPU twin turbo RX-7 is easily capable of 300 hp, and this is with just exhaust, boost controller, and intake. I'm not exactly sure of the hp numbers this can achieve, but I would be willing to bet that a BPU RX-7 would go easily above 300 hp, depending on how much boost that car was making. Anyway, this 300 hp BPU RX-7 still has many more things that can be done to gain hp. You could upgrade the twin turbos and put bigger ones on, this would gain considerable horsepower. I don't know why anyone would do this however, because you could do a big single turbo and make even more power. I'm not saying that there isn't anything you can do to an n/a engine because I know this isn't true. Just as far as building a car goes, there really aren't a whole lot of things to do to add considerable hp to a n/a engine. Say for example you put an intake, exhaust, pulleys...and so on, let's just go to say you put on every bolt on possible on the renesis, the potential for horsepower is no where near as great as it is with the tt engine.
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2000 Honda Civic EX 1986 Mazda RX-7 GTU
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#7
06-29-2003, 10:21 PM
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please bear in mind that the main differenc between the N/A and Turbo Rotary is merely 2 things...
The turbo's have lower compression, and a turbo... Therefore N/A's have more potential, because they do not have a turbo... yet....  eg, what happens when you put that great TT system on a renesis and work out all the engine management bugs... LOTS OF POTENITAL HUH!!!! I'm just being a smart ass and agreeing with you (13BDriver) Also bear in mind things like power to weight ratio's sure the 13B-REW only has 5 less HP, but how much more does it weigh? How much more heat does it generate with that great tt system? therefore, how much more room up front is being taken up by the volume and weight of more heavy duty cooling devices (heater core, oil cooler(s) radiator, ast, massive front mount intercooler... etc) On that note remember the Renesis is physically smaller. Again, I would simply buy the renesis. tear it apart, port the shit out of it, with the money i save from all the ancilary turbo stuff buy a great aftermarket ECU and dyno/track tune the hell out of it... the problem now is waiting until the Renesis decreases in price enough for all this to be feasible. My main reason for prefering the N/A engine is the power band... much much flatter, and wider torque curve, than even the super smooth seemingly transistionless TT system on the 13B-rew. Have you driven a Combo-Port lately?
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#8
06-30-2003, 11:40 AM
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Don't get me wrong, I love the Renesis engine. I love that Mazda brought it back and hopefully, finally worked out the rotary engine. So don't think by any means that I am dissing the renesis or anything like that. If I were going to build a car to autox, I would go with the Renesis engine if it were at this time feasible. This engine would make a much better autox engine because of the flatter powerband and wider torque curve.
But...didn't the guy that said he wanted to put a Renesis in his car have a 93 or 94 TT? Correct me if I'm wrong but don't those have the perfect 50/50 weight distribution also, even with all of the heavy cooling devices and such?? I'm not trying to argue with you dayna240sx, just trying to make a point. Anyway, for me, I have to go with the turbo. My friends around here all have turbo cars, and if I am even going to come close to competing with them some day, I know that is my only option. My best friend has a 03 WRX with up-pipe, downpipe, turbo back exhaust, VF22 turbo, Link Engine Management, and a supra fuel pump. He ran a 12.9 at the track. His car doesn't fuck around. Also, I have a friend with a Supra with an SP74 turbo and too many other things to list, and when it went on the dyno, he had 805 hp at 5,000 rpm, but the radiator started spitting fluid so they had to let off. I know there is no way I could ever build a naturally aspirated car to come close to them, without going through the headache of converting the car into a turbo car, which is going to cost lots of money and consume lots of time to get everything right. Hell, I was thinkin' about putting a turbo on my Civic, but even if I did get it on there, it wouldn't be worth the time because it would still be slow unless I wanted to throw like 15 more grand into the engine after I got the turbo setup. So, I guess my point is, if you have a tt engine, it is much easier and less costly to build than it would be to build the Renesis engine.
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2000 Honda Civic EX 1986 Mazda RX-7 GTU
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#9
07-14-2003, 01:15 AM
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Having a Renesis engine in an FD3S would be very nice. No turbo-lag.. While the FD's twin scroll turbo greatly reduces that lag, it still exists. I would give up 5 hp from a turbo for almost the same amount of real engine power. And if you wanted more hp in your Renesis, you could add a turbo.
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#10
07-17-2003, 04:22 PM
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Quote:
Ive heard the RENISIS suffers from S200 syndrome, where the torque is above 6k rpm, id give up a bit of lag to have low end torque Ive also heard the RENESIS is diffucult to turbo because the exhaust manifold is a weird design and bends around the frame...dont quote me, I think it was in SCC... doesnt swin scroll mean a single turbo with some fancy trick to it, like the STi and new Legacy, whereas an FD would have a sequential turbo?
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Derek:word..im debating //Penner\\ : i'm a master debater Derek:well youve had a few more years experience than i Derek: Haha AF Sig Material
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#11
07-18-2003, 04:09 PM
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Quote:
Here's aplot. Notice how flat the S2k's torque curve is (these are rear wheel numbers, and pretty good for a 2 liter sports car) http://www.comptechusa.com/images/dyno/s2kintake.pdf http://www.randdmotorsports.com/imag..._stockpull.jpg
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I've owned over a hundred cars in the last 40 years. What was I thinking?   2013 MINI JCW Roadster 2023 Chevy Bolt
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#12
07-18-2003, 04:15 PM
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Hmm, thats not bad. My dad had a S2k (borrowed it off a friend working at Honda) and it wasnt lacking on power, but a bit more torque all round would be nice.
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Derek:word..im debating //Penner\\ : i'm a master debater Derek:well youve had a few more years experience than i Derek: Haha AF Sig Material
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#13
07-19-2003, 12:22 AM
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I love how this guy never seems to reply to his own threads...
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