I didn't mean rwp.

 

My friend dynoed his RX7 with out the turbos making any boost and got about 140rwhp, considering the renesis is only making 180rwhp on chassis dynos (although substantial evidence has pointed towards the ecu generating errors or running in limp mode because it senses it isnt moving anywhere) it would seem great to slap on a turbocharger, however with the adjustment of the exhaust ports etc. the exhaust pulses possibly wont be so strong, which originally was the rotarys great strength for spooling turbos quicker or as quickly as large 6cylinder engines. However a supercharged renesis, well that might get real interesting.

 

I'm curious... has anyone done a s/c FD engine on top of the turbos? (there have been multiple turbo/supercharger combos done on other cars that I have read about...)
john

/I dont think this would work because of detonation problems, cause you get that problem with just the normal turbos....

J/W

 

yeah i'm a hater b/c i like to spell know like this k-n-o-w not n-o.

 

Uhm I hate to bring you all down, but last time I looked at the Renesis, the exhaust ports were so close to the side of the car, that there was no room, to fit turbos, on the RX-8, what makes you think you'll be able to wedge it into the RX-7, and make room for turbos... Superchargeing sounds feasable, cause you don't need room at the exhaust manifold...
As to just "Slapping it in" Good luck, from what I heard at SS6 the ECU is instrumental in both detonation detection, and sparc retardation (With 98 oct. or poor fuel), as well as the whole electrical system for the intake ports is hooked into the ECU and from what I gathered "Other" Black boxes under the hood that get their cues from the ecu...
I also understand that removing the gauge cluster keeps the car from turning over... since there seems to be something (sensors) possibly that are then wired through the gauge cluster into the ecu....

Doing an engine swap would mean a complete castration of an RX-8 and a destruction of a good RX-7...

If anybody wants to know how you stick an 20B in an rx-8... well all the work to get the haltech to work with THAT has allready been done... the tricky or possibly not part would be to have the gauge cluster read properly... but then again I didn't do that swap and would be missrepresenting any details, due to my lack on knowledge on the 20B Rx-8 at SS6.....

 

Have you ever driven a FD? stock or modded?

There is almost ZERO turbo lag, sometimes even in modded trim.

 

rx-7 engines are much sexier. lol

 

quote:
--------------------------------------------------------------------------------
Originally posted by truejunx7
i just really hate the turbo lag on the 13b.. so im sorry for all the people who wrote flames that i am a newb, but i just like the 20b around 235 hp n/a.. for those that made comments with more use, thank you.. for all u haterz.. go home
--------------------------------------------------------------------------------

New here, but i kinda own an FD (dad hasnr signed it 2 me YET),i Have M2 Performance Stage 3 kit on it, and its fast as hell with no turbo lag from the stock seq. so obviusly you never drove an FD have you?!? Thats Ryte, step-off.

 

There are reports that the renesis motor can put out high 200's HP @flywheel N/A (basically equivalent to a monster bridge) with some tuning, intake, and exhaust mods (headers). Of course, you won't have the torque of a turbo motor, but the engine should last a long time, have lower emissions and get higher gas milage.

I'm toying with this idea for my car, which is a series 4 6-port (1986). What would prevent one from just buying the renesis keg and using the series 5 6-port intake with the VDI? Might have to fab the lower intake manifold and modify/fab the RX8 header I guess.

Sounds to me like a great idea for the FD or FC that wants 250-300 HP. I don't see why you would have to use the RX-8 computer. Just run sufficiently large secondaries and remap the rx7 ECU (that will be the hard part, anyone know what the powerband is like?). Fab/modify an RX8 header and there you go. Seems like a reasonable swap to me.

Question: who's selling Renesis motors and at what cost?

 

OK, can you drop the compression with the older (but, heavier) 13B-REW rotors? Or switch housings/sideplates for the sideports? (I'm guessing certain ports/pin holes don't line up)

 

Compare the 2nd gen 13B motors. The turbo makes about 25% more in stock trim so what about 300hp for a mild turbo renesis? And we all know how to get more power from a turbo rotor... Looking forward to seeing what can be output fully worked....

 

Ok, i belaeive i will say what i think as well.
Most of us 3rd gen owners just get a monstrous turbo and put it with the rest of the goodies needed to work, and we produce 500rwhp. This is something that will never happen on a Renesis engine due to the high compression. Someone also said that rotary engines welcome those huge masses of compressed air those single turbo produces. That's not for the renesis as well.

the conclusion is that Renesis engine was made for NA use. If you want a turbo on it either you will not see more than 250rwhp, either you will spend more money than bying a 20B, to change to low compression rotors, i dont know what, etc etc.....

In any case it is not considered a good mod.

 

Anyone else see a place to get those lower compression rotors? The nex rx-7, which should be turboed, which would require lower compression rotors. But then again, why would you put in in an FD?

 

Well, I'm sure putting the renesis in the 3rd gen. is -possible-, but why would you want to? It appears to have some serious seal problems, it requires a complex ECU (in RX-8 form). The RX-8 is so messed up engine wise it gets worse mileage than my 3rd gen RX-7 (though the stuff in the RX-8 is cool - accessories etc.). A friend of mine has one. His exausts are dripping carbon muck because it's running so rich! If they ever get the engine sorted out it will be a fine car.
If you took a "crate motor" (ie - from the racing series), you would have to develop the ECU yourself. I don't see any benefits here! I know one development team has an RX-8 now putting out 240 HP to the rear wheels and getting decent mileage (using a piggyback ECU - where have I seen this before ;-). They probably do not meet emissions (yet). I suspect they will run into transmission problems next. I hear it's at the limit with a stock RX-8.

As for NA 13B output - it peaked at 160 HP with the 2nd gen 2nd gen (89-91 ;-). If you tweeked a 3rd gen motor (higher compression ratio, lightened rotors, etc.) you might reach 180 HP in NA form. About where the RX-8 is currently. Drive both cars. You'll find the RX-8 feels gutless. As I said above, once they get the engine programming sorted out it will be a fine car.
I wouldn't want that engine in my car in its' current state.

 

The higher compression isnt really a problem for a forced induction car. It just means you dont need to run as much boost to make the HP. In other words, instead of running say 18psi to make 400rwhp with a 13B youd only need to run probably 15psi to make 400rwhp if you had the higher compression.

I dont see any problem swaping that engine into a FD, all you'd need to do it fab a new intake manifold system. Another option might would be to get the intake manifold setup off the lower hp rx8 and port it out. That manifold setup doesnt have the extra ports that open at a certain rpm.

STEPHEN

 

No one has yet mentioned one advantage to the renesis, no tubros and no smog pump means it weighs less. Possibly alot less.

There's more to an engine than what it will do at a drag strip.

 

That is an incorrect statement. Proper compression ratio is everything to a forced-induction engine. Trying to run forced induction with a compression ratio that was meant for NA operation means that you cannot run anywhere near the same boost without running into severe detonation problems, especially with the crap fuel being sold now. Plus, the tremendous combustion temps would require dialing back ignition curves drastically-- even if you were running high octane race fuel. You'd probably only be able to run 6-8 psi max, and wouldn't really pick up much.

 

I agree with Kento. OK lets assume you get the 400hp on a high compression with 10psi, with a low compression you have to run 15psi. What if i want 500hp??? with the low compression i can run 20psi and get that power, with high compression you run 11 and it brakes due to detonation. Thats the difference.

Of course this was just an example. You will NEVER run safe 10psi on a high compression.

 

The new RX-7 will have 300 hp N/A...It will have a larger rotary not a 13b. It will also come in a Mazdaspeed version that will be turbocharged.

 

Right ! and you got this info where ???
Who even said that the RX-8 is a success, and from all "Roumors" that would have to be a fact first and then.... we might concider (very Vauge) designing another RX-7 I'd say you're gonna be waiting at least 2-6 years... since Cars don't just show up, they need to be engineered.. even then, count me out for an NA RX-7... even 20B N.A. I'll wait for the tubro version... The whole reason the FD works, is due to the turbo compensating for the lack of tourque the rotary design lacks...

Plus no one has seriously adressed the fact that the ECU is an integral part of the dash, and engine...you supposedly need all 3 to party, at least that's what came out of the 7Stock Banquet with the peple from Mazda R&D ..........
The guy with the custum ecu hinted... but it's custum.. you're not walking into your auto zone, and picking one up...

Stick with things that have been done.. 20B in RX-8 Chassis... I'll buy that, it's been done... Next !