renesis in a 3rd gen rx7..think it'll work?

Hey. So I'm not going to pretend to know mazdas all that well. However...I would do just about anything for a 3rd gen rx7. However...everyone knows the issues with their motors. So...I'm wondering if anyone knows about the feasibility of putting the rx-8 motor into the rx-7....

Any input would be appreciated.

Anything's possible with enough money...but in your case, I'm sure it's rather feasable, and probably relatively easy. Of course, for a lot less money, you could upgrade the cooling on an FD3S and have a lot more potential for horsepower from the 13B.

I have actually considered this swap myself. Ofcourse I'll wait until the RX-8 drivetrain becomes more affordable.

I have not seen the final version of the production Renesis. However, At this point all I can tell you about the swap is the engine mounts on passenger side of the vehicle will need some creative fabrication. The drivers side mount should be pretty cut and dry. Almost like putting a 13B Cosmo Engine in the FD3S Chassis. Which has been done hundreds of times.

I disagree with Mr. 1Mazda323Fan he is obviously a boinger (one who is fond of piston engines) this fact virtually strips all integrity from him frim my point of view. Lets ask him how many Rotary Swaps, overhauls, rebuilds, and race cars he has built or has assisted in the assembly of....

Cooling is not the only issue with the 13BT-REW in the FD3S Chassis. But then again, one wouldn't know that unless he has replaced a few.

It is a good idea, because:
the Renesis is more Compact
generates less heat
Has no turbos to create excess heat
has proven to be more durable
is 10 years newer in engine technology (eg coatings, materials etc)
will be big with the aftermarket


give me a year or so and I may submit a how-to post on this very topic.

Excuse me, Mr. Dayna240SX. I was unaware that you are a rotary expert. I am a fan of piston engines, as they are generally, but not always, more stable than rotaries, but I am also a big fan of rotaries. One dream car of mine is an FD3S. I considered dropping a 13B into my 323 for a time, before I realised how much work that entailed. True, there are more problems associated with FD3S 13Bs, but the cooling is the one that seemed to cause most of the problems. As for the Renesis, yes, it is lighter and more compact, only because it has no turbos. For it to ever equal the potential power output of a 13B, some sort of forced induction will have to be added, negating the weight and size advantages of the Renesis. And, as you say, the Renesis WILL be popular with the aftermarket, which is likely, only if the RX-8 sells. Who knows? It may bomb completely and they won't even make it next year. Won't be too much aftermarket support then. I'm positive the RX-8 will sell, and I hope it does, because I find the car, its capabilities and its price for those capabilities very attractive. As I was saying, though, the Renesis WILL be popular, but the 13B IS popular, i.e. there already is a lot of aftermarket support. Besides, the major problems associated with the engine have been solved years ago, so as long as proper care is taken in fixing any potential hazards, the 13B could be made to last nearly as long as a Renesis.

Granted, I probably don't know as much about rotary engines as you do, but I do know enough to offer a valid opinion to IntegraR's question. I take great offence to your statement, because you trounced my opinion simply because you believe yours to be the better one. Since you obviously didn't read my entire post, I actually said that the swap is feasible and should be relatively easy, but for the difference in cost of buying and installing a Renesis vs. beefing up a 13B, it doesn't seem worth it, as the 13B offers more performance, plus the potential for much more than the Renesis. You are free to believe whatever you want, but in the future don't denounce someone's opinion based off of one post. Besides, it's an OPINION, and one that I am free to vioce.

Oh, and exactly how many rotary swaps, rebuilds, overhauls and race cars you have built, performed or assisted in the assembly of, since you obviously know so much more than me about them.

I apologize for the lenght of the post, but I'm not some dumb little punk kid who drops his two cents everywhere just for shits and giggles. I post with knowledge that I have, and base my opinions off of that.

Thank you.

how many swaps have I done? by swaps i mean making a rotary work in something un intended... about 20.

How many rebuilds, around 50

Their have been ZERO RX-8's delivered and already hundreds payed for. check the RX-8 forums, there are many people proud of their pre-order status at their local dealer...

The Renesis does have much better power potential than the 13B-REW. It is a stock ported engine.. With a simple exhaust change with a slight re=map to overcome the increase in exhaust velocity, look at power over the 300 range...

I am not personally attacking you, if that is the way you perceive it. I absolutely hate it when someone who doesn't know all the facts whips out a medicre reply something to the effect of "if you have enough money anything is possibe"

OR maybe say that and give specifics, Like:
The engine mount Issue,
the ambiguity of whether the clutch assembly from the renesis will work with the the FD3S transmission, or whether the 6-speed from the RX-8 will work with the PPF from the FD3S. or what exact modifications we will be looking into...

Long story short, if you feel threatened, there is no reason for it.

If you feel like pissing in my wheaties anymore, please do so via e-mail so we can pan-out our differences in a professional manner.

Higher power potential than 13B REW???? i dont think so. A stock 13B TT has around 220RWHP on a dyno dynamics. Easily get it to around 300RWHp. U would be struggling to get the RENESIS to 300HP at the engine. Turbo swap on the rew and u got a hella lot of power.

phatdex...

The Renesis has 5 less hp than the 13BT-REW W/O any form of pressure charging. essentially they have gotten 90 more HP out of the same displacement engine they had 10 years ago (eg, 2nd gen (fc3s for 1Mazda323Fan) N/A engine) Remember the RX-Evolve? IT had an "advertised" HP of 280. With pretty much the same engine as we will have roaming around shortly in the RX-8. You know what has happened to the extra 30 hp in the last 2 years? Emmissions......

A mild port job to a renesis with exhaust and a mild re-map will net well over the 300BHP range.

The engine isn't even in the public yet and people have no clue of its potential.

It makes me sick when people think the only thing you can do to net greater horsepower is to add a Turbo. I think the main reason why people like turbos is more for the BOV noise than anything like a power increase or whatever.

Phatdex, it sounds as though you've seen a Third-Generation RX-7 on a Dyno before... Have you seen an RX-8?

I agree the 13BT-REW can make "hella" power (mine was well over the 320 BHP mark several years ago on stock turbos)... but lets just hold off, and give the renesis the benefit of doubt and see what it can do.

Yeah, but all those renesis powers u stated were all at the engine. 300HP at the engine aint much to talk about. Especially in the rotor world.
My RX3 with 13BT from an FC RX7 made 270RWHP on a dyno dynamics dyno (so it would be more on a dynojet) with exhaust, microtech computer, injectors, FMIC and 13PSI boost. That is an engine that originally made about 140KW at the engine now making (with those few mods) a little over 200KW AT THE WHEELS!!! That is about an 80-90% increase in power.

Now I know u can always port the crap out of the engine, but u gotta think about driveability. I know that u can get alot of power from porting but petrol and ease of driving really needs to be thought about for everyday driving. And for a 13B, turbo is the only way to go for high HP and ease of driving.

Basically, what I am saying is I feel that for a mild upgrade the RENESIS will be fine, but for extreme horsepower, Ie 600RWHP there is nothing but turbo.

And do u know what one of the first aftermarket things from people such as Top Secret, HKS or RE Amimeya will be, thats right; a TURBO KIT.

And I am quite impressed with the power level the 13B NA engine has produced, but there is only so much u can do to it upgrade wise.