No body really addressed the question though, so here is my opinon

Installing the new rotary in an FD would be a waste of time especially if you were going for max power thinking you'd get more reliability. Throw a turbo on a 'reliable' rotary and you get the FD, which isn't a real ' unrealiable car' but is no Civic DX. All advances in the engine included you wouldn't be any better off with a renessis. As for saying ANYTHING about what the 4th gen (if there is one) RX7 will have as far as turbo renessis or whatever, it is all hear say and what some people think Mazdas next move will be. The renessis won't reach the same performance of the 13b-rew dollar for dollar! Maybe a second iteration, but not the one in the RX8.

Try putting 5 grand into the RX 8 and getting 300 + rwhp!

 

Depends on whether they will offer a crate engine for about the same price. And will it bolt up to the trans. And when anyone starts making any aftermarket parts. Should be easy to get 300+ hp from a Renesis which is a better motor. No intake dilution, better oil sealing. low emissions, no port overlap. Should be easier to make more hp, not harder. Mazda has now had 10+ years of engine development time to get all the issues with the 13B resolved. Looks like the new motor is well on it's way to being what rotary enthusiastists wanted all along - all the benefits of the rotary without the faults.

 

I second with rotary-tt coments...
years and years of freakn R&D!! if the renesis is not an improvement then i dont know what is. I believe that the latest technolody Mazda will put on the new rx7 (crossing my finger) will even be better. Im not certain if they will have the renesis engine but i know it will be close to it. using existing parts and improving it would be the better solution don you think??

About passing emmision standard in the US, i dont know what kind of cats they will put for the 4th gen... one for the downpipe, midpipe and catback? hahaha just kidn...

 

Lets hope Mazda does the job for us with a 4th Gen RX-7.
The RX-8 is a ok small family car, but it doesnt turn me on.
The Renesis should be ok for turbo, you just gotta find a place for it. Rotaries cannot really run very high compression, the combudstion chamber winds up looking like a mini-pad

 

There will be a turbo Rx8, 3 or 4 tuning companies over here in Japan are already working on it. They are also talking about rebuilding the motor with lower compression rotors to handle higher boost.

 

Not saying it isn't a 'better' motor. My point is that it is always easier to get performance out of a turbo motor than an N/A motor. It won't be as responsive to the same modifications either.

 

There's some significant problems to overcome if Mazda were to turbocharge the Renesis engine, one of which is the new engine's vastly improved combustion efficiency. One of the benefits of the 13B-REW is that there's a huge abundance of exhaust heat, since some of the intake charge is actually still burning as it exits the exhaust port. This heat is what drives the turbos (quick spooling). With its side-port design, the Renesis motor burns the intake charge much more efficiently before it exits the exhaust port, making the exhaust temps far cooler. This brings up the problem of emissions regs, which are becoming stricter by the minute. In order to heat up a cat quick enough in order to work, there has to be enough exhaust heat. If they do put a turbocharger(s) on the Renesis, be prepared for an even more restrictive pre-cat in order to get emissions to tolerable levels.

I don't know about the supposed Mazda engineer's comments, but my impression is that they are working on a NA engine with larger (wider) rotors for more power, rather than a turbo. Easier to pass emissions, more responsive performance.

 

well issue #1 is they changed the motor mounts again, so you would have to fabricate something. the renisis mounts on the center housing.

#2 we dont know if they changed the bellhousing bolt pattern, if they did then you need the rx8 tranny too, and fabricate a new ppf

#3 you would have to be crazy to do all that work to shave off 50+lbsft. however the renisis would be sweet in a lighter car

mike

 

j9fd3s: do you think we can swap the manual tranny from the 8 and put it in the 7?? am just wondering... 6 speed is not bad... hehehe

 

now theres an idea! that would be sweet.

 

I heard from a friend that he read an article in popular mechanics and they talked about re-introducing the RX-7 with the Renesis engine (normally aspirate) in 2006 and then in 2007 it would be turbo charged. I think that will happen depending on the sales of the RX-8. They can't take the same chance of what happened with the 3rd gen RX-7.

 

I heard that mazda was working on another new engine with many renisis traits but only 3 ROTORS and turbo charged for use in the glorified return of the rx-7, expected to put down close to 400hp in a light new spanking rx7!! okay wait im dreaming, if their is a ROTARY GOD I HOPE YOU'RE LISTENING!

 

I was reading some mechanic articles about the renesis engine. So far with only intake and exhaust they were able to achive 300HP. Now imagine bridge porting that !!! After that, I say swap in some low compression rotors, slap on a big turbo and keep it straight piped. That sounds like one hell of an engine!

 

That's what I am talking about. Now someone needs to wreck on so I can get my hands on the transmission and fit it in my FD.

I hear a rotary god rain dance coming on.

 

Bah...gimme a good single turbo setup or some BNR stage 3's done right for my FD. No used fixing what isn't broken right?

Now, I would be crazy enough to try and force the Renesis into a miata though...

 

ity will never be impossible to add a turbo i dont care what anyone says
if it has an exhust it can be turboed
in the case that for some ungoldly reaon it can not be turboed how about a supercharger
it iwll be reliable because rotary engines without turbos are the most reliable things on the road hands down
dont care to hear any arguements
yes its been thought of
no it hasnt been done
blahg blah blah
SEARCH FUNCTION!!!!

 

You guys are all missing the point. Even if you can get 300 hp out of the NA renesis, you'd be getting that only at really high RPMs. From the reviews that I've read, the 8 is pretty anemic at low and mid end. What's the point of having no power until almost red? Might as well get an s2000. I want the turbo so I have lots of power throughout the entire RPM range.

Plus, I don't think we'll be seeing a turbo RWD anytime soon. Do you guys remember the hell they gave you at the Mazda dealers when you tried to test drive the FD? They didn't want some yahoo crashing the car bc they couldn't handle all the power going to the rear wheels. How many turbo RWD cars do you see on the market today? I can't think of a single one. Even the porsche is a 4WD now. Manufacturers are going more for mass appeal than enthusiast appeal. If Mazda were to introduce another turbo rotary, it'll most likely be a 4WD. You guys might not agree with me on this one, but a 4WD will never be a true RX7 replacement.

 

hmmm... we are going of topic here...

it will be a while to see some answer for the thread as we have to take a lot of factors to swap a renesis to an rx7!

even if you do, will it still be N/A?? or will you want it to perform like the rx7 by adding turbos and all the basic mods...? the problem here will be what type of ECU will control all this stuff?? we all have to wait till the rx8 comes out and people start fidling wiv the car...

How much is the renesis engine by the way? lets all donate and do a R&D on it.... hehehe

 

For those of you thinking swapping the RX8s tranny into our car is a great idea... I'm next to possitive that the tranny in the 8 is the same as in the S2000...obviously not built for torque. Getting an extra cog but a weaker tranny does not sound worth it to me, especially because it won't be cheap! The situation would be amplified considering someone who takes the time and money to swap the tranny is probably going to spend the money for power mods as well. A tranny designed for ~150 lb/ft is not going to like 260 lb/ft of torque in a modified 7.

 

why? the miata/renisis tranny is super close geared, it actually turns more rpm on the freeway than the 5speed. unless you are auto xing its just more shifting

mike

 

Turbos also perform better under load. The load actually helps the turbos' efficiency at forcing more intake charge into the combustion chamber at mid-rpms. Shortening the gear ratios will effectively reduce the load on the engine (all other things being equal).

 

I am sure they can put in a turbo on the renesis engine, high compression or not, look at the hondas, NSX, Integra (Vtec) and the S2000 they are all high compression engines and ywt all of them have a turbo kit made for them without changing their pistons and stuff.

 

Yes, but the boost levels have to be set artificially low and timing pulled waaay back to work with stock NA compression ratios and increasingly bogus pump fuel. You can slap a turbo on anything, but you have to make everything work together, otherwise-- as has been seen many times-- things go poof in a hurry.

For that matter, I'm sure turbo kits will be out soon for the Renesis, since they won't have to deal with emissions. But as far as a production turbo Renesis, I'm not so sure.

 

I've seen one in a 3rd gen here at the emission testin labs in Mi. They have to cut a chunk out of the hood to fit the upper intake manifold. Looks lousy. Aparantly the engine sits further back in the engine bay of the rx-8. I might have pictures from the autoshow. I'll check.

 

I thought about this about a year ago about possiblity of putting RX8 (renesis) engine into Fd's.. but you know after reading about it and seeing what 20B could do.. why spend all the time, money, parts, fabrication.. and try to get this 2 rotor to push 400+... you could get 20B and try to push 600+... My opinion they will be about the same in cost.. you still need aftermarket ecu, turbo, sub frame, all the bells and whistles...my 2 cents..