bryanwheat

Hi, new to the forum here. This place seemed like the better place to get some information. It is a combo that i came up with to use some existing parts and put together something more easily swappable into an rx8. Basically i have a couple engine's worth of parts from fc car's that are good usable parts. I've got a set of housings in really good shape and good rotors, e shafts and counter weight's from an s4 and s5 n/a and also can get a set of tII rotors pretty easily if need be, but i figured that the s4 n/a rotors would maybe be fine for the power level i am looking at, but i haven't i guess seen really anyone using these parts together or how well they work together or if the port timing between the exhaust on the fc n/a housings and rew iron's would work well and also if the side seals and corner seals on the s4 rotor would run over the intake ports fine. My goal is to put together something that will handle 300, maybe 350 more reliably than a renesis that will more easily go into the rx8 than the s4 or s5 engine. Basically rew iron's, s4 housings and than the rotors, e shaft and counterweight from an s4 motor. Any info on this would be greatly appreciated.

diabolical1

iTrader: (3)

welcome to the board.

well, they will all bolt together if that's what you're asking.

you will need to make sure you have counterweights to match your rotors. you will also need the REW oil pan and front cover.

bryanwheat

I have seen some using the renesis front cover to retain the timing trigger mounting point, but so far not much on which oil pan is compatible with that, i assume the renesis but still researching that part a bit on the rx8 forum's. Trying to kind of see what will bolt together and what rotors work with which housing's and so on to make a combination that i can still use the oem system's and not a totally custom everything under the hood.

diabolical1

iTrader: (3)

i think i have seen at least one car run the Renesis front cover, but i don't know/remember which oil pan they used. i think that car was in England and it used the factory ECU (or a modified version of it or something). i do remember it having a neat setup on the intake - a Holley-type manifold with an upper adapter that ran the Rx-8 throttle body.

what i can say for sure is that the pans are different lengths, and also there are no provisions for mounts in the Renesis pan. so if you plan to go with the Renesis front cover, you'll likely have to find a way to graft the two pans together or go custom.

that said, there is this: https://www.rx8performance.com/produ...ne-swap-kit-v2

... and i know you're probably wondering why i wrote all of that before i posted the link. the reason is i think the guy that runs that site is a former member at Rx8Club and was involved in some questionable incidents. it's none of my business. i don't know what he ACTUALLY did or did not do, but there was enough stink for me to make a mental note of it. i've never had any dealings with him, personally, so this all just observations as an Rx8Club member. you can make you own decision.

bryanwheat

From what i've seen i think one bolt hole is just slightly off on the renesis cover and has to have the hole enlarged a little and a little modification to the gasket, but nothing too crazy to be able to keep that stock sensor in the front. I've found a few adapter plates to go from the renesis intake manifold to rew or the s4 6 port iron's as well, so it looks really possible to get most of everything from the renesis bolted to the outside and get it to function on the stock component's and just flashing the stock ecu which should meet my goals i'd think. It's too bad that they didn't just build a modern version of the rew and put in these car's, it's such a good platform to work with as far as potential, but people are left with swapping in piston engines, dropping 8k on a use rew that might or might not last, or taking a chance with boosting the renesis with it's high compression and having a hell of a time trying to keep it from detonating. As far as the oil pan, that was possibly the one part where it seemed like maybe welding 2 pans together or just putting the engine together and tracing out the shape of the flange and have one cut out with a waterjet and just making something simple that works around the crossmember. I still have a lot of research to do honestly, just trying to figure out what would work internal wise and make an engine that i can go and beat on a bit doing laps at the track if need be.