5sp to the rx8 6speed conversion
 

Hey sorry guys I searched the archive I do not think this was ever brought up if it was I am sorry. I've been wondering we have a rx8 roleover smashed. I was wondering if anyone knew how hard it would be to instal the 6speed in my fc ? Can it be done?

I know the bellhousing bolt pattern is the same. That's about the extent what I know though.

I didnt even think of that.. i'll ask the mazda dealer tomorrow when i fuss them about my spark plugs ive been waiting for... for like 2 weeks..

try it.....you can be the first to let us know.

and you gotta take pics!!! i want to see when you finish it..

Is it a T2 or no? Cause from what I've heard and seen is that the RX8 6 speed is weak, and probably going to not do you much good if you have many mods.

:werd:

Sell the trans to an RX-8 owner who needs it, and buy yourself several good, used FC transmissions with the money.



-Ted

i say try it . if it works you have a newer 6 speed. and doesnt the rx8 have more power than the t2?? if so it should really hold more then .. try it trannys arent that bad to do

if the bolt pattern is the same, they all you probaby need is a custom fit driveshaft, Possibly a different speedo cable. and you might need to extend wire, or change the connectors. If the Tranyy is cheap, TRY IT!

I would say torque would be the issue, not horsepower

im waiting for a wrecked one to come into work lol. and then its mine!

well you beat me to it. moreso, even, a t2 with mods (he hasn't said whether its an n/a or t2 yet). even the rx8s (a few) have had tranny issues. as interested as i'd be just to drive the car with a 6 speed, i'd rather sell it, profit, and not blow the tranny just for kicks.

I agree. The drive shaft will be the real problem here. With the RX8 being a 4 door it has a longer wheel base. Though with the tranny being a 6 speed the tranny housing might be a bit longer which could allow the drive shaft to work. If you can get it bolted up then that would be super rad. A carbon fiber drive shaft will save a good amount of wieght and help accelleration.

The RX8 Tranny is a modified Miata tranny to fit into the 8, it will never take the abuse and HP of a highly modified rx7. Some 8 owners are already reporting bad trannies just because they slapped on slicks.

So don't put it on a highly modified RX-7, leave it to a mildly modified one.

Send it to me, I have been thinking on this for a long time, and I wanted to try it. j/k, but I think that it would be a good idea, and I really have been thinking of it.

mmmm...6th gear....

I too want one for an N/A FC w/o a shit load of mods (I do believe that TQ is the issue), the gears are shorter which is the main reason I want one. I'd really like to see how this works out and how much you'd have to change.

Kiyo

Gearing for a TII would be totally off as well -- it would require new gear ratios to maximize the powerband of a TII.

David

I would like to see the gear ratios for the RX-8 tranny

Why not just buy the 6 spd sequencial tranny from HKS for 6k. then you wont have to worry about overpowering it since it can hold anywhere from 300-800. It is a lot more spendy though.

why?
 

Damn... that sucks that it's so weak... I was wondering the same thing myself...

Make it a hell of a lot easier to drive the 7 after driving the SE-R for a while. (the only car I own with working A/C, so sometimes it does happen) I usually try to shift to 6th at least once or twice a trip for about 2 days afterwards... usually the BOV is an indication that I'd better not try to engage it.

I have had the same problem with the 180SX as well... enough of one that I'm toying with using the S15 SR20DET with a 6 speed when it gets put back on the road.

6 speed transmissions rock once you're used to them. :D

Maybe if there is a Mazdaspeed version of the RX-8 with a turbo it will force them to build a beefier version.

I would love that, except it would be a pain because of the diff. gear ratios for turbo and N/A. I would like it because it would be beefier for road course racing and such (I go to road america 2-3 times a year with Midwest Counsil (I can't spell) and the group I work with. They're all piston nuts, and I always wish that I had better gearing and rear end in my car because it just dosen't get out of the hole worth a crap in 2nd at ~30-35 mph. Maybe I should just carry more speed through? :p: (probably get somthing over these crappy goodyear eagle HP's, they have no stickiness to them)

But seriously, a 6th gear to shorten the rpm drop would be great, especially for us, because it would keep us in our powerbands better.

Overall I don't really think this is something for turbo guys to think about...it's an N/A car so it's just not smart. The tranny is made for a high flyer N/A engine with lots of horsepower and adequate torque, not lots of horsepower and torque from the holy lord himself. If you're an N/A guy I say go for it, if turbo...buy an FD tranny if you want something new.

Kiyo

FWIW a custom driveshaft is dirt cheap if you have flanges from both stockers to work with. It's costing me 90 bucks to have my driveshaft modifed for my swapped 7.

I havent found a 6sp from anyone thats the only reason I thought about the 8. Do you have a link or a number so I can check into buying one. How much did you pay just for the tranny?

Give you $50 bucks for the engine, tranny and ECU out of the wrecked 8 :) I'll even throw in this shiney new nickel... it's shiney :)


I don't think i'm being convincing enough, am I?

lol not a bad Idea ;) except the only thing I like about the 8 engine is it is true dual getting rid of the heat problem would be nice ;) If you want the number to the yard I will give it to you maybe you can work something out with them. I did check into the 6sp on the 8 and it sounds like it will hold up to mainly anything I wouldnt even flinch putting it in a 95 twin. I will check into the hks 6sp. Personally I always thought the fc needed another gear.

Do you think HKS just slapped on another lower gear for 6th?
Boy, are you going to be disappointed.


-Ted

Well... did any one think of taking a rx8 engine and tranny and put it into a FC?... everything should work out.. besides the weight difference... or just slap a V8 chevy engine into the FC.. with a 6 tranny from some other car..

This is the site.. forgot to post it b4..
http://members.tripod.com/~grannys/2...x7chevyv8.html

Or sell the car and buy one with a V8 in it already.

Amazing how a soft clutch, OEM grip wheels, and not 7000rpm launching keeps things from breaking :rolleyes:

yeah... i could just find a busted up chevy.. wit a v8 for a good 1000 bucks.. and pimp that ride... but i like my 7...