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Old 02-12-04, 09:24 PM   #1
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rx7 engine swap for rx8

Whould it be possible to swap out the rx7 engine for the new rx8 (Renesis) engine? The Rx8 makes about the same power as a rx7 and its not turbo charged put it in a rx7 and tubo charge it and that whould be inasne, but whould it Fit
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Old 02-13-04, 01:11 AM   #2
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well it would probobly fit since the engines are baisicalty identical in size and shape except for the turbos. now for the amount of fabrication needed to do this, iduno. but it seems quite
plausible.
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Old 02-13-04, 01:23 AM   #3
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its not worth it. also t2's have more tourqu. there are ao many resons why this is not worth it
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Old 02-13-04, 09:48 AM   #4
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I have this thing about not listing to not worth it peaple, they ant worth it. I have done a lot of not worth its and I deside for my self. DO THE SAME
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Old 02-13-04, 10:03 AM   #5
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there are things I love about the FD's engine and things I love about the Rx-8's engine. save for the turbos on the FD when you compare the actual engine, there is no comparision.

This could give you a basic idea if you compare a stock FD with a FD with a renesis engine. The FD weighs about 2800 lbs. If you put the renesis in it you will lose about 90 lbs since the renesis is smaller and lighter and you will lose the IC, turbos and hoses, etc. You will need the rx-8's transmission also, which is lighter than the FD's (how much lighter I dont know). That would probably put you in the 2700 lb ball park. Now you can look at exhaust. You would likely lose 50-60 lbs cause you would have to have some custom exhaust fabricated. So figure 2650 lbs, 238 HP 4.44 gears is going to be seriously fun.

I would not think twice about putting the renesis in the FD, the problem will be the ECU and other electronics. But damn that would be nice.
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Old 02-13-04, 04:23 PM   #6
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A more worth wild conversion would be to put a Renesis in a 1st gen with Canzoomer's stage 2 mod. Imagine about 225 rwhp in a 2300 lb car. That would be insane.

Last edited by t-von; 02-13-04 at 04:25 PM.
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Old 02-13-04, 04:51 PM   #7
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Quote:
Originally posted by t-von
A more worth wild conversion would be to put a Renesis in a 1st gen with Canzoomer's stage 2 mod. Imagine about 225 rwhp in a 2300 lb car. That would be insane.
depends, with the FD you get amazing looks and exceptional handling. I'd give up 500 lbs to have the balance of the FD.
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Old 02-13-04, 08:21 PM   #8
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Quote:
Originally posted by t-von
A more worth wild conversion would be to put a Renesis in a 1st gen with Canzoomer's stage 2 mod. Imagine about 225 rwhp in a 2300 lb car. That would be insane.
Well.....To be honest I think 400rwhp in a 2300lb car would be a little closer to "insane".

IMOP the renesis does not impress me. What kind of power do you consider insane? Whatever the number, a 13bt can do it just as easily and a hell of alot cheaper. Ya the Renisis is a cool new design and it revs to 9k reliably...yadayadyada...The big difference between a 250hp NA and a turbo engine is about 80ft.lbs of torque. Turbocharge a Renisis? Again, the same results, just a more expensive route.

On a ranting note:
Personally, I have lost respect for Mazda since the release of the RX8(there wasn't much to begin with). Not to say I don't like the car, and that it isn't a fun car to own, BUT any manufacturing company that states a HP rating and drops it 2 TIMES after orders have already been finalized is rediculous. And the fact that the thing is about as quick as a stock TII is very REDICULOUS!! Ya its nice and new and it does look damn cool but for 30k it had better be much more then what I have seen the RX8 has to offer in stock form.

I'm not trying to start a flame war. This is all my own opinion. I am a more performance oriented voice in the scheme of things and the RX8 fell way short when compared to even the FC let alone an FD.
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Old 02-14-04, 07:15 PM   #9
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Quote:
Originally posted by ZeroBanger
depends, with the FD you get amazing looks and exceptional handling. I'd give up 500 lbs to have the balance of the FD.



Well I mean in terms of the ultimate NA sleeper. A 1st gen w/Renesis and Canzoomer's stage 2 mod would easily smoke a stock Fd in the strait line. It would also be a reliable daily driver that would get excellent gas mileage. I still posses my 1st gen (needs a motor). After all these years it's still one of my favorite cars.
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Old 02-14-04, 07:29 PM   #10
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[quote]Originally posted by XLR8
IMOP the renesis does not impress me. What kind of power do you consider insane[quote]


A vehicle doesn't have to be "insanely" powerfull to be fast. 220rwhp in a 2300lb car could easily pull hi 12's in the 1/4 and be street legal w/ emissions.

[quote]
On a ranting note:
Personally, I have lost respect for Mazda since the release of the RX8(there wasn't much to begin with). Not to say I don't like the car, and that it isn't a fun car to own, BUT any manufacturing company that states a HP rating and drops it 2 TIMES after orders have already been finalized is rediculous. And the fact that the thing is about as quick as a stock TII is very REDICULOUS!! Ya its nice and new and it does look damn cool but for 30k it had better be much more then what I have seen the RX8 has to offer in stock form. I'm not trying to start a flame war. This is all my own opinion. I am a more performance oriented voice in the scheme of things and the RX8 fell way short when compared to even the FC let alone an FD. [/b][quote]

Remember, Mazda designed the Rx8 to be more of a grand tourer/sports car. In it's current state, it is not comparable to the Rx7 in overall performance. We need to wait and see till the Mazda Speed version comes out to do a true comparison. Also if your worried about the lack of hp, why not just use that 500 refund you got from Mazda and pay for Canzoomer's mod?
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Old 02-18-04, 12:32 PM   #11
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I totally agree with you t-von, rx8 is not worth spending the money on IMO.

A better conversion would be to put a 13bt in a CRX, or even better a 4g63 with a bolt-on ball-bearing turbo.

Or a 1st or 2nd gen rx7 with a buick regal motor, i've seen one at the track running mid 12's with factory mufflers and all, pretty much all stock, couldn't even hear it...altimate sleeper.

I love thinking up of cool car setups...kind of like a 1st gen rx7 with an N/A 13b engine with '91 rotors and 93 side plates as a daily driver, no porting even needed.
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Old 02-18-04, 08:06 PM   #12
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Renisis in a Go-Kart. 400-600lbs of deathwish!
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Old 02-19-04, 01:06 AM   #13
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Quote:
Originally posted by XLR8
Well.....To be honest I think 400rwhp in a 2300lb car would be a little closer to "insane".
No, 400 rwhp, is just about perfect in a 1st gen.
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Old 02-23-04, 07:40 PM   #14
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It might be more insane to put it in the 2nd generation but the third generations body styling is cooler and looks more modern
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Old 02-24-04, 01:42 AM   #15
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IMO putting a Renesis engine in the Fd would be a waist of money because the 13brew is already capable of more power becasue of the turbos. Why spend the money to make the car slower?
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Old 02-24-04, 03:54 AM   #16
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Quote:
Originally posted by t-von
IMO putting a Renesis engine in the Fd would be a waist of money because the 13brew is already capable of more power becasue of the turbos. Why spend the money to make the car slower?
because the power output is not the most importnant thing, for example a CA18det or what ever the silvia engine is turboed putting out 450rwkw is ******* stupid and i would prefer a stock RX8 to it anyday just becuse the torqe curve on the silvia will be like a ******* pyramid.
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Old 02-24-04, 09:48 AM   #17
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I just have a very hard time imagining someone taking a motor that can produce 10psi @2500 rpm and puttting a renesis that has no bottem end whatsoever and makes way less power in the high end...and is over rated for that matter also. To each it's own though...i know a guy with a 12a PP in a 3rd gen body.
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Old 02-25-04, 01:45 PM   #18
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Quote:
Originally posted by t-von
Well I mean in terms of the ultimate NA sleeper. A 1st gen w/Renesis and Canzoomer's stage 2 mod would easily smoke a stock Fd in the strait line. It would also be a reliable daily driver that would get excellent gas mileage. I still posses my 1st gen (needs a motor). After all these years it's still one of my favorite cars.
Insightful post, I agree, I love my '79 car.
Personally for a wild N/A FD (and it would be fully road legal in NZ) I'd like to see a PP twin rotor - although not exactly full-on wild, just in gas consumption.

I also posted info on the 20B forum about a 4-rotor FD.

The latest NZ Performance Car mag, Cover: Quad Rotor N/A FD
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Old 02-25-04, 01:52 PM   #19
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Quote:
Originally posted by 12abridgeport
I just have a very hard time imagining someone taking a motor that can produce 10psi @2500 rpm and puttting a renesis that has no bottem end whatsoever and makes way less power in the high end...and is over rated for that matter also. To each it's own though...i know a guy with a 12a PP in a 3rd gen body.
Ahh yes to each his own, I kinda meant 13B PP for the ride I described above but hey 12A PP would be awesome in a tube frame or monocoque car with carbon-fibre FD skin, try that for light weight and great suspension poise.

BTW a few years ago in NZ there was a 20B PP FB (proper REAR mid-mounted) and with carbon fibre skin. It had endurance racing huge flared arches and in my opinion is a pretty good example of what you can do. So Renesis in an FD, yeah easy really, but in a real old 1st gen SA22C would be evn better in my jaded eyes.
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Old 02-26-04, 03:30 AM   #20
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Quote:
Originally posted by Shamrock.James
because the power output is not the most importnant thing, for example a CA18det or what ever the silvia engine is turboed putting out 450rwkw is ******* stupid and i would prefer a stock RX8 to it anyday just becuse the torqe curve on the silvia will be like a ******* pyramid.


I understand that power isn't everything but stock for stock to remove 255hp/217 lbs torque and install 238hp/159lbs doesn't make much since to me. You would easily spend thousands of dollars to make it work and get less performance. Also even with Canzoomers stage 2 mod the performance would still come up a little short because of the differance of torque. Sure the gas mileage and overall reliabilty would be better but the trade off and "expense" IMO wouldn't make it worth it. You do understand that you don't have to drive the **** out of the 13brew to get decent performance like you do with the Renesis?
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Old 02-26-04, 07:52 AM   #21
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this engine has almost the same hp than the tw turbo n doesnt have a turbo. this engine its a lot better than the other one because inside this engine has more ports for intake n exhaust n its going strait to the rotor because the position of the ports, its like a semiperipheral engine. so if you open this this engine and you ported out n polished out a better intake n exaust n a good turbo you wiil flying.also mazda its coming with the rx8 turbo in about 6 month.
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Old 02-26-04, 09:52 AM   #22
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I believe this already has been discussed before...but renesis motor is not the best choice for turbo. First of all higher compression rotors but most importantly their exhaust ports are more suited for n/a rather than to propel a turbo. The original exhaust ports would spool turbo a lot better due to excessive rotary exhaust heat...heat plays a big role in turbocharged cars, on the exhaust side that is.
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Old 02-26-04, 09:56 AM   #23
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Edgardo, do you live in Orlando by any chance...i just know someone by that name here that's into rotas.
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Old 02-26-04, 03:46 PM   #24
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Quote:
Originally posted by edgardo
this engine has almost the same hp than the tw turbo n doesnt have a turbo. this engine its a lot better than the other one because inside this engine has more ports for intake n exhaust n its going strait to the rotor because the position of the ports, its like a semiperipheral engine. so if you open this this engine and you ported out n polished out a better intake n exaust n a good turbo you wiil flying.also mazda its coming with the rx8 turbo in about 6 month.


Your missing the point! The Renesis is an excellant engine for what it does however; in it's "current" state if its put in the Fd overall you will loose performance. The engine wouldn't be able to produce the hp figures that the engine in the Rx7 already does because of it's higher compression. Now if and when Mazda produces a true turbo version of the Renesis, that a totaly differant story.
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Old 02-27-04, 12:15 AM   #25
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well its not like you couldnt turbo a 10:1 reni engine. it just wouldnt be as effecient at spooling as a 13brew nor could it take as much boost. but then again, just image what about 8-10psi of well tuned boost would do on that engine. makes me drool.
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Old 02-27-04, 12:15 AM
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