RX8 Fi\'d

Lacey · June 20, 2011, 08:54:45 PM

That\'s pretty decent

Grant Monkhouse · June 20, 2011, 09:30:36 PM

to get more power out of the renesis block why dont they just peripheral port the exhaust, get loads of gas flow then!!

Will66 · June 21, 2011, 10:01:13 AM

If you do that then you might as well just use a 13B-RE or a 13B-REW since you\'ll need new manifolds, you might as well use the older housings. But to get big power you\'d either port for lots of overlap and lose decent idle and low end power or stuff a huge turbo on it and get lots of boost and then you get a big horsepower figure but a massive step in power delivery that\'s virtually unmanageable in all but a straightline.

jetpilot · June 21, 2011, 11:04:46 AM

Quote from: Will66;770569If you do that then you might as well just use a 13B-RE or a 13B-REW since you\'ll need new manifolds, you might as well use the older housings. But to get big power you\'d either port for lots of overlap and lose decent idle and low end power or stuff a huge turbo on it and get lots of boost and then you get a big horsepower figure but a massive step in power delivery that\'s virtually unmanageable in all but a straightline.

On that basis of swapping out, are they directly interchangeable of would you need large amounts of fab work?

Lacey · June 21, 2011, 11:39:59 AM

You\'d need the same as what you would for any engine swap really - loom, possibly custom mounts, new exhaust, ECU etc

Grant Monkhouse · June 21, 2011, 11:46:41 AM

I\'m sure it can be done, splicing the 8 ecu to run the engine would be an expensive and long task. Easier to use a separate e u all together just for the engine.

With money anything is possible.

Be far easier and cheaper to buy an FD and build it for power.

Lil-Steve · June 21, 2011, 11:51:11 AM

Quote from: Will66;770569But to get big power you\'d either port for lots of overlap and lose decent idle and low end power or stuff a huge turbo on it and get lots of boost and then you get a big horsepower figure but a massive step in power delivery that\'s virtually unmanageable in all but a straightline.

It don\'t understand how would that be different with a MSP vs REW engine? You use excatly the same tuning principals.

jetpilot · June 21, 2011, 11:53:22 AM

Yeah i hear that, but after 2 fd\'s and a fc they have run their course and done to death imho!

Ive just heard through the grapevine re-worx have done this, mating an Rx8 subframe to Fd one.

I appreciated nothing is as easy as it sounds and work/money is required, but would be nice to have something a little different.

Anyone know the limiting factor of the drive train on the 8 or is it very similar in respect of the fd\'s hp handling capabilities?

Will66 · June 21, 2011, 05:11:29 PM

The gearbox is quite tough, it\'s an Aisin unit and I am pretty sure it is in the S2000 and even the meaty ones of them are running stock boxes, the 8\'s diff is also pretty tough too. The prop shaft is a ninja carbon fibre jobbie so is also up to big power. I reckon that Mazda were starting to spec it up with a target power of 300bhp in mind but turned it back for whatever reason, probably emissions related or somesuch enviro-bunkum. Several of the uprated cars I\'ve seen have been entirely standard other than the turbo and not had any problems coping with 300 hp.

jetpilot · June 21, 2011, 05:23:31 PM

Quote from: Will66;770680The gearbox is quite tough, it\'s an Aisin unit and I am pretty sure it is in the S2000 and even the meaty ones of them are running stock boxes, the 8\'s diff is also pretty tough too. The prop shaft is a ninja carbon fibre jobbie so is also up to big power. I reckon that Mazda were starting to spec it up with a target power of 300bhp in mind but turned it back for whatever reason, probably emissions related or somesuch enviro-bunkum. Several of the uprated cars I\'ve seen have been entirely standard other than the turbo and not had any problems coping with 300 hp.

Thanks Will, seeing as you seem to be the 8 aficionado :Thumbs-up do you know if there are any fi\'d ones on the south coast and the members lurk on here?

Will66 · June 21, 2011, 07:56:02 PM

On the south coast there is at least one I can think of, he\'s in Portsmouth and has a Turbo that was built and tuned by Re:Worx. There\'s Tekken who is in South London who has a very nice turbo again built by Re:Worx, he\'s been on here but is quite busy at the moment and doesn\'t post on here or the RX8OC Forum much although he is still around the place. California Style on here is Pettit Racing UK\'s main man and his RX8 has pretty much all their toys on it, it\'s not been on a Dyno as far as I know but he\'s got to have 330+ whp and is looking for more when they finish developing the stage III Pettit Supercharger kit, although he\'s in North London. Having applied my "highly scientific" backside dyno to his car it\'s got so much more mid-range thump than a stock RX8, the power is there in greater quantities whatever the revs and stays there right up to 9000 rpm. There\'s a chap with an Supercharged RX8 in Bognor Regis somewhere but I don\'t think he posts on here much and he\'s out of the country a lot. Exiled-Viking/Tango Tony/T200CAD (whichever username he\'s using at the moment) lives up North but likes to get about the country with his.

Re:Worx have done several Turbo conversions on the RX8 as well but I don\'t know of many other than the ones mentioned. I did meet a chap at a trackday who had one which he had dynoed at 360 whp but he was having boost control problems and wasn\'t running it hard that day.