highest HP with 6 spd.
#3
Junior Member
Thread Starter
iTrader: (1)
Join Date: Jan 2009
Location: south FL
Posts: 215
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
out of all that discussion, i have yet to see/read about one 400hp + Miata with a 6 spd in it.
most all high hp Miatas i've read about use the 5 spd with the expensive Quaiffe guts.
i've read about 300-350hp Miatas using the 6 spd successfully, but nothing north of 400hp.
there's gotta be someone with a high hp Miata using one, i'd like to know if it will hold up to the abuse.
most all high hp Miatas i've read about use the 5 spd with the expensive Quaiffe guts.
i've read about 300-350hp Miatas using the 6 spd successfully, but nothing north of 400hp.
there's gotta be someone with a high hp Miata using one, i'd like to know if it will hold up to the abuse.
#4
Supporting Vendor
![](/mt2011/images_td/ranks/vendor.png)
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (33)
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,659
Total Cats: 134
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
people have destroyed 6 speeds, it's just uncommon.
400whp street driven with mechanical empahty should be fine. if you're drag racing, ********, or just abusing it, expect it to last longer than a 5spd would but not for forever.
400whp street driven with mechanical empahty should be fine. if you're drag racing, ********, or just abusing it, expect it to last longer than a 5spd would but not for forever.
#7
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Wasn't that guy with the 8 sec Miata running a 6-spd and broke third. He was making like 580whp or something, drag only car. So, realisticly, 400hp should be cake for a 6-spd. 5-spd, ehhh, 350whp is pretty much the limit.
#10
Senior Member
iTrader: (7)
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,369
Total Cats: -1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I know, right? That's what i've been saying. Someone should make a kit. A "This is everything that you need to do a TII tranny swap except the tranny" kit. Or even a TII drivetrain kit including the stuff to swap the rear.
#11
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I have read into it. 350whp is the safe limit. I read and go on personal experience. We had the stock 5-spd on the 480whp 1.8l, never had an issue. Keith Verges' cars are making 275whp with a FMII kit, Hydra ECU, and all run stock 5-spds. NEVER had a tranny fail. They make close to 250tq as well.
Last edited by ray_sir_6; 02-11-2009 at 09:46 PM.
#15
Former Vendor
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,103
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I have read into it. 350whp is the safe limit. I read and go on personal experience. We had the stock 5-spd on the 480whp 1.8l, never had an issue. Keith Verges' cars are making 275whp with a FMII kit, Hydra ECU, and all run stock 5-spds. NEVER, had a tranny fail. They make close to 250tq as well.
#16
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
so, your saying that I have the same chances of blowing up my transmission on 250 HP going to taco bell as you do walking down the runway?
#17
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
The 480whp Miata we had was a d-r-i-f-t car, and he blew the motor before he blew the stock 5-spd. It was a stock block, and lasted 2 events. That was when he parked the car, and then parted it out. The chassis is now sporting an LS engine.
#18
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
You're a ******* imbecile. Jerry Hoffman had 2nd gear fail on a simple 2nd-gear acceleration pull during an autocross at 235tq. I decimated 3rd gear at 219whp. I have a friend who did the same thing at less than 200whp. If you never had an issue, you never drove the car. Just because YOUR shop has never had an issue doesn't make the tranny invincible at 350whp. Take your high-and-mighty tuning-shop attitude and stuff it up your ***.
You are right, I don't drive my car:
YouTube - Miata @ MSR Cresson
My friend driving it. 223whp/191tq. Tranny isn't broken.
![](http://img.photobucket.com/albums/v655/ray_sir_6/Drag%20Strip/th_MiatavsDragCar.jpg)
Sorry, I'm driving it this time. Made about 25 passes, ran a best of 13.51@103. Most passes were 14.1 or better. No tranny noise, no grinding. Must be a freak tranny, goes with my freak power setup, since you can't make 184whp on the WG. How many other MT rumors do I need to shatter before people stop arguing and start listening?
#20
Former Vendor
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,103
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
The only rumors are the ones you spread. The 5-speed is not reliable at 350whp - period.