Also get in touch with Alex and Steve over at www.GothamRacing.com. Last I heard Chris and Ari over at www.rx7.com weren't currently working on FDs at all. Gotham has done numerous swaps so can give you an accurate quote.

 

I know, right. A properly running 400 rwhp FD will trap 125ish mph, faster than just about any (stock) street car out there. Of course, there are crazies like me.......I put my perfectly running 400+ rwhp FD out of commision in search of more powuh

 

Will the 5 speed transmition hold up to that kind of horse power?

My friend has a Honda Civic (I know I know, just bare with me and read before you flame)

He is running around 490 -511 HP depending on fuel, he was going through transmitions like nothing, he had to have a custom one built @ the cost of $3800.00

The thing was that with the original transmition he could only get to 135 MPH, but hed get there in less than 13 seconds.

I wonder if the RX-8 Transmition might be a neat conversion, or is that out of the queston.

Any suggestions?

 

the stock 5 speed is good for 500+WHP but it will eat the occasional syncro from time to time if abused. rarely with they launch a bearing or a gear, just suncros..

to be honest, the diffs break more than the trannies do on high WHP RX7s.

the 8's 6 speed transmission can literally only hold 1/3 the power of the FC/FD turbo tranny before it breaks.

if there is one thing that was overbuilt for these cars it was the tranny, only a mis-shift into fifth from second or constant abuse can hurt these manual gearboxes.

 

Why would going from 2nd gear straight to 5th gear (missing 3rd) cause any problems ?

:-) neil

 

I've stated before, the auto is just fine for street driving. if you keep it under 350 hp it will be plenty fast for the street. anyone with the auto should upgrade to 4.33 gears. it wakes up the trans putting more power to the wheels at low end. anyway enjoy the car its more than most people can handle even with the auto trans


Jeff

 

I had read in the "how fast have you had your FD" thread that a guy had his FD going 168 while racing a Ferrari, do you think his car topped out because of lack of power, or because the FD's 5th gear is not long enough, because he said at thet speed the ferrari just started to walk away.

Has a custom 6 speed ever been put into a FD , allowing it to reach speed above 200 MPH?

I understand that at those speeds you would obveously need some serious aero-dynamics to help keep you on the ground.

 

because of the RPM difference between 2nd and 5th gears. you are say redline in 2nd gear but then throw it into 5th which brings the RPMs down to a meager 2000RPMs while powershifting, well, the syncros job is to slow down the rotating mass of the input shaft to match speeds of the gear it is going into and the 5th gear syncro is the smallest of all the syncros in the tranny since it is the smallest gear(since it is overdriven) and thus is the weakest link in the transmission. i have seen the 5th gear syncros broken into several pieces but most of the time they just crack open due to the sheer force they are trying to overcome.

2nd gear syncros are the next weakest link since it is the most abused gear change and after 80k miles and tens of thousands of 2nd gear shifts the syncros usually are worn and have little bite left so they can't slow the shaft down fast enough or at all anymore and wind up grinding going into second.

 

You and I both know this well

 

well i've done it but only you managed to blow up the syncro, lol.

 

i think the person who told u that auto's were faster was referring to a "sport tuned" auto tranny. like the ones on supras and nsx's. and yes they are faster than the 6sp version.

 

A stock FD only has the power to hit 157-163 mph (depends on model, R1/R2 has more drag). The stock tranny/rear end could hit 200 mph with enough power already.

 

is that true for NSX's too?! im pretty sure there a good half second slower as well, the auto tranny on a supra is damn fast though, no hesitation between shifts at all and no loss of boost.