Look on the rx8club forum.... a few people have blown their trannies.

The Aisin 6spd is nothing more than a 5spd Miata gearbox using smaller internals to fit a 6th gear

Smaller parts usually means weaker.

 

Sounds reasonable but people still put Turbos in Rx8's and get close to 500hp and they don't have many tranny options do they?.. What about the 7's 5 speed, do they not brake ever ? I'm sure I can bolt up a 5 speed in my ride if needed fairly easy, anyone know if the 8's and the 7's trannies have the same spline pattern for the driveshaft yoke ?

 

rofl

 

Tremec T56 6sp transmission with a Browell bellhousing mated to a 13B/20B and you have yourself a winner.

 

JPR Imports has put a few Fd trans in rx8s in the last few months because the rx8 box is really a Miata box and they break.

JPR Imports has to modify the shifter to the front..

 

I just browsed the Tremec site – would a TKO 600 work if 5 speeds and 600 lb-ft. torque is sufficient? It's 36 lbs. lighter than the T-56.

By my calculations, the fifth gear at .64 would run at approximately 2,050 rpm at 60 mph.

 

Liberty's Gears would be a subject matter expert for that question. It is best to talk to them about that question.

WELCOME TO LIBERTYS HIGH PERFORMANCE

 

Well like I stated and a few of you guys can see from my webalbum pics lol, I have already a working 6 speed in my STARX8 PROJECT. So simplicity wise that is how I will go from now with the FD I am about to drop in there, well am in the process of it I just have to acquire about $1500 worth of more parts to get it right before I fire it up. It will work, now how long it will last that's another thing.. But I can go to stock 5 speed for the FD if the 6 speed brakes, that will be the easiest and cheapest way to go, I will keep the Rx8 LSD and carbon fiber driveshaft I doubt that will be a problem. A T56 conversion sounds expensive given everything I've done so far, yeah their bulletproof so it might be a nice alternative to having a 6 speed, which I have grown very fond off.. Rough estimate for a T56 tranny and bellhousing adapter plates, like 3 grand ? a 5 speed FD $300 lol, a 6 speed (which I already have 700-1300).. Thank you for being clear and thorough in my questions.. Since we're in the subject of trannies, I have a 93 FD auto tranny I got with my engine with only 10k miles as stated in the ebay auction I bought the engine from that has been stored and primed with oil since 94, I am selling the auto for $400 if anyones interested..

 

If it is your prerogative to drop in an RX8 transmission into your FD, then so be it. With my personal experience (and many others), I like doing things right and done once. I do not want to have another variable that could leave me stranded on the side of the road. If there is a probability of that, then I will obviously go with a method that is tried and true. It will be more cost effective, less frustration and less time spent redoing something: that is an undisputable fact.

 

^ Guys, VICEdOUT does not have a FD. He has a custom project that already has the RX8 trans installed. Click the link in his sig. It would be easy to swap in the REW.


VICEdOUT, swap in the REW motor and see what happens. If the trans blows up then you have your answer. If it works then you save a lot of time and money.

 

This ...

 

Well reading on a search I found that all turbo trannies have the same size shaft splines and also the Rx8 uses the turbo Rx7's shaft with same size splines but the non turbo Rx7's have a smaller size shaft splines.. So the 8's driveshaft will fit with a 7's tranny, I think they are the same lenght.. All found here in this Racing Beat link:

Rotary Tech Tips: Transmissions


Didn't mean to confuse anybody or mislead, I just mean FD engine when I say FD, not the 93 and up Rx7 car itself.. I have an 89 STARQUEST

 

No !@#$, but what about the ratio's? You can beat on that and it shifts faster IMO.

 

Someone do a DSG swap I'm PO can't afford the other O or R.

 

$1975 JUST for the Browell Bellhousing WTF !! ??

Paradise Racing - Browell Bellhousing Mazda 13B

http://www.browellbellhousing.com/current_pricing.html

 

BREAK, for God's sake...not BRAKE!

 

I've been thinking more of 6 speeds over the last few months when I DD the FD. Would be nice to have some closer gearing 3-4-5 and an overdrive 6th gear.

The T56 trans out of the GMs and the T56 from the new Mustang are a known quantity. The Mustang version seems to have improvements resulting in better shift feel. Still not as good as the stock trans or a Miata or Honda though...

However for my power levels, I don't need something as 'strong' as the T56. Every now and then I think about the 6 speed from the 350Z and contemplate things...

 

i know this thread is old but seen a few rx8s with fd engines 400+atw still using rx8 tranny no probs(so far anyway)

 

Anyone know any other clutch slave cylinders that will work with the 6 speed on the FD swap? Since the Rx8 cylinder is too long and hits the 7's engine oil filter.. There has to be an easy swap to a shorter different slave cylinder that matches the bolt patters of the 8's tranny and does not hit the oil filter on the FD.. I will have to mix and match slave cylinders until I find the right fit if no one knows of one already..

 

this is actually incorrect. the 99-05 Miata, and 03-08 Rx8 have a similar design, but they share very few parts, and the Rx8 has much beefier shafts and gears than a Miata does, in fact the 03-08 Rx8 trans has beefier shafts than the FD trans does. however people break synchro/hub/forks in the Rx8 trans, so the normal method of failure is not shifting very well.

i used to have pictures of the insides of the Rx8 trans vs the FD/turbo FC, and the Rx8's hard parts are larger.

the 350Z and S2000 also use an Asin transmission, its related to the Rx8's.

there is another option, the 2009-2012 Rx8's had a completely different transmission that is much more robust.

 

go to Autozone and get Duralast part # 13090 Cs2162 slave cylinder... I believe its for a early 90's honda but it bolts right to the rx8 tranny and clears the oil filter and works great!! I have an rx8 tranny installed in a 73 rx3. It is a 4 port, street ported 13b NA so im not making turbo power but the rx8 tranny will hold power if you know how to drive! All the idiots that are breaking them just are A) running too much power or B) dont know how to drive or lastly C) all of the above

 

^^^ Thanks for that part number and clutch slave cylinder info, I will def try that one if the one I decided to go with doesn't hold up the pressure, (stock pressure plate for the moment but next one will be a Red Stage pressure plate from Clutchnet.com) I went with a clutch slave cylinder from a 2005 Mitsubishi Eclipse 2.4L that fits with a little drilling of the two holes and angled up spacing it with washers lol it also utilizes the 8's cylinder rod..




I have also bought me a SYNCRO SAVER so there will be absolutely NO hard, over pushed shifts and I will shift with confidence and care and we shall see just how good and long the 6 speed tranny lasts for...
http://raceroots.com/index.php/produ...cro-saver.html

 

given the title of the thread i just couldn't resist... love the Hurst shifter ball on my T56 FD.

maybe i love the close ratios even more especially the 2.66 first.

four years of happy shifting.

howard

 

Anyone remember the GReddy / Trust 6 Speed Trans for the FD?

 

Wasn't the price tag for that around $8,000?

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