so i love the all motor thing.... (my opinion its more reliable) and i really like the rx8 engine.. it pulls nice and who doest like 9k to redline on stock... so who has tips for me.. i know its a pain cause of all the "electronics but i want that engine it seems dope!!!! i drove the rx8 and if that engine can pull nice on that heavy thing.. i can imagine on my first gen... help me please

 

why do something like that, when you could get a 86-91 non turbo motor and build it. the motor and everything would be way cheaper than a renesis engine, plus there is more that has and can be done to a wankel. and i dont know about you, but i have been hearing alot about the recalls on the rx8 and most of them are because of the motor. or you could do a 2nd gen turbo swap, ive seen these motors go for less than 1500 with almost everything you need.

i cant hate the idea that you are thinking way outside the box, but i would rather do something that has been done before.

 

all rotarys can redlin to that amount its all about money

**** why dont u go spend 10grand and have a 20b in there

 

Granted there is a huge difference in weight between the rx8 and the FB, the rx8 still doesn't weight much more than 3,000 lbs.

Also, I've only seen a couple of FB's with Renesis engines in them, so there isn't a lot of people who've swapped them into FB's. You'd pretty much be on your own, but I do know that it is going to be insanely hard to get everything mounted in there. A **** ton of custom fabrication and what have you.

There are a lot of better options out there, though. I don't know how long you've been doing research on rx7club, but 238 horsepower can be done reliably with a turbo rotary with a lot less modifying (think TII engine).

 

Wow I like the advice you have been given - 20B, 13B non turbo or turbo 2 - huuummmmm

Looks like I may need to save up!

Scott

 

Bridgeported rotaries can make power all the way up to 9.5k rpms. Peripheral Ported rotaries even higher than that. It just takes money. Either a Bridgeported or P-ported rotary will make just as much power, if not more, than the Renesis. The P-Ported will definitely, but that's not streetable at all.

And aside from that, where are you doing to get the engine from? I personally don't know that you'd be able to get your hands on a Renesis without buying an Rx8 or finding someone who took their Renesis out and swapped in a different engine.

I say if you are going to do something all motor, do a three rotor. Can't go wrong with a three rotor. And if you are going to be spending an *** ton of money on an engine swap, the 20B has a lot more aftermarket support and everything else than a Renesis as well.

 

gutierjunkie (yes its horribly misspeld) has a renny motor + turbo + ems and piggyback for sale if you really wanted one

 

I wish someone would do a test.... if that engine is making power at 9,000RPM's... ill buy you a case of beer for every week for the rest of your life....

PEOPLE... just because an engine will go to 9.000rpm does not mean that it is worth while.... True... its fun to see 9K on the tach every once and a while...but hell..whats the point... In my opinion after 7K your just making noise.
SHIFT.... run it up again....

 

I want to know if the Renesis makes power to 9 grand as well. Like SCCAIT7 said, there is no reason to rev past a certain point if the engine stops making power by then.

 

I work at Star Imports Mazda. The Rx8 is the most problematic car that comes in there besides the 2003-2004 Mazda 6. Always having problems with them. I'd say buy the 7th year of making the Rx8 they'll have most of the glitches worked out. Think about it. The 13B has been around forever...

 

With an unported motor I would agree but with ports power is still made above 9k. My 45mm PP has rev limiter at 9250rpm,could rev it harder but not much point. Rx8's will still make power at 9k especially with free flowing exhaust. What makes you think it wouldn't??????

 

The Renesis' power supposedly peaks at 8200 RPM stock. So, I imagine shifting at 9K would be reasonable, particularly with a free-flowing exhaust or any sort of porting. (Though, I don't know the RX-8 tranny's gear ratios.)

 

From what I heard, the people porting their engines aren't gaining much power because of difficulties in tuning the ecu. Assuming that if you are going to do a Renesis swap into an FB you are going to use a standalone, then that would solve that problem I am sure, but then again that is just what I've heard. We all know that standalones are far from cheap.

 

thanks for all ur guys help... although the 90-91 all motors do seem good .. has the highest compression and what not... id just figure that the renesis would be kinda easy since its an all motor and stuff..... kinda wanted a "drop in and ur done" kinda swap... thanks for the advice ..

 

Renesis Front Clip YO

 

Mine with me in it and 3/4 tank of gas is 3090 stock with V710's on the stock wheels. I'm 160lbs.

 

I'm perfectly happy with my car, but I have access to a stock '91 13B NA. Is it difficult to hook up the stock fuel system or easier to run a carb setup on it?

 

*sighs*

ANYTHING is possible with enough time, money and effort.

But renesis into 1st gen is one of the hardest swaps IMHO because:

1. There aren't many people who've done it who can help you
2. The engine mounting system is *completely* different, so there's lots of custom fab work
3. Wiring, fuel delivery system

and of course it probably won't bolt to your transmission, so your choices are trying to custom fab a way to make it work, or installing an Rx8 transmission which brings it's own headaches of mounting and custom driveshafts, and a different shifter location...

So to do the swap you'll need the engine, all electronics (harness and computers), the entire fuel system, the transmission, LOTS of money, a TON of time and the ability to custom fab mounting brackets and other custom pieces you'll need to make.

If you do it, it will kick ***... but like the 3rd gen Twin Turbo swaps, not many people have done them because they're hard and expensive and you can get the same kind of horsepower returns from an easier/cheaper to swap/mod 2nd gen engine.

Jon

 

If your car is a GSL-SE, you can hook up the stock fuel system. It's not ideal but I've heard it will work somewhat.

If your car is the one in your sig, the problem is this:

Fuel Injection : Requires about 40psi
Carburetor: Requires between 2.5-4psi

You can see why you can't hook a GSL's fuel system to a 2nd gen engine and expect it to work.

Running the stock 2nd gen fuel system (if that's what you're asking)... well I don't know how hard it is because I've never done it. Personally, I'd carb it, but alot of people prefer FI and have lots of success with it. There's a lot of support for both ideas, so take what you like and jump in.

Jon

 

Isn't the 8 throttlebywire as well?

As far as seeing abysmal gains from porting:
the ports are already a decent size and shape. Also, it's a sixport, so porting is only about 60% as effective (can't port as much) as with a four port.
Which brings me to my point.

We all know that the GAINS (%) from porting a four port ARE better than a six port.
Did you know: The Auto-tranny motor of an RX8 is a FOUR PORT. I'm wondering if we're all tuning the wrong Renesis?

 

here:
https://www.rx7club.com/showthread.p...hlight=renesis

i think some guy might be buying the turbo kit off it, so n/a it is. i can build the motor mounts and help make it all work for ya too. (909 is close to me)

 

abysmal?
http://www.rotaryheads.com/dyno/rx8_...ort/index.html
9% before we did any tuning whatsover, and it was running richer than stock!

 

and for all the guys asking about power up top, i've kept making power with a renesis engine until the rev limiter kicked in--would have made more power without a rev limiter.

 

The new automatics are the same six port engines the manual use.

 

i'd be scared to spin a torque converter that fast without a depleted uruanium scattershield