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Old 02-11-2009, 12:19 AM   #1
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Default highest HP with 6 spd.

wondering how high the 6spd can be taken...

anyone out there with over 400hp with a 6 spd?
how many miles on it, how's it holding?
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Old 02-11-2009, 12:11 PM   #2
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There's been much discussion on this. I think the power limits of the 6speed are largely unknown because I don't think anybody has actually broken one.
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Old 02-11-2009, 12:46 PM   #3
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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.
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Old 02-11-2009, 07:20 PM   #4
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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.
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Old 02-11-2009, 07:40 PM   #5
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What tranny was 1badmx5 using? He was pushing 500hp.
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Old 02-11-2009, 07:57 PM   #6
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I'm about to put 300whp through mine on the street...250whp on the track.
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Old 02-11-2009, 08:21 PM   #7
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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.
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Old 02-11-2009, 10:08 PM   #8
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Quote:
Originally Posted by ray_sir_6 View Post
5-spd, ehhh, 350whp is pretty much the limit.
Read more. 250whp is where you start breaking 5-speeds based on pure torque. Shift one hard at 200whp and you can break it, too.
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Old 02-11-2009, 10:13 PM   #9
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I swear, the next time I see one of these "what can I make that you guys will buy" threads, I am going to argue RX7 transmission adapter plates until I am blue in the face.
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Old 02-11-2009, 10:22 PM   #10
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Quote:
Originally Posted by mazda/nissan View Post
I swear, the next time I see one of these "what can I make that you guys will buy" threads, I am going to argue RX7 transmission adapter plates until I am blue in the face.
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.
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Old 02-11-2009, 10:34 PM   #11
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Quote:
Originally Posted by Savington View Post
Read more. 250whp is where you start breaking 5-speeds based on pure torque. Shift one hard at 200whp and you can break it, too.
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 10:46 PM.
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Old 02-11-2009, 10:37 PM   #12
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5 speed is a piece of **** at 250 whp
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Old 02-11-2009, 10:39 PM   #13
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Quote:
Originally Posted by TURNS101 View Post
5 speed is a piece of **** at 250 whp
treated like the car in your sig is treated? go figure
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Old 02-11-2009, 10:43 PM   #14
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no other cars I am on the track with blow trans like a miata.
This comes up all time simply because the trans are ****. When you'er turbo.

So my sig doesnt matter..
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Old 02-11-2009, 10:46 PM   #15
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Quote:
Originally Posted by ray_sir_6 View Post
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.
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 ***.
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Old 02-11-2009, 10:47 PM   #16
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Quote:
Originally Posted by TURNS101 View Post
no other cars I am on the track with blow trans like a miata.
This comes up all time simply because the trans are ****. When you'er turbo.

So my sig doesnt matter..
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?
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Old 02-11-2009, 10:48 PM   #17
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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.
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Old 02-11-2009, 11:03 PM   #18
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Quote:
Originally Posted by Savington View Post
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 ***.
OK, and? You just named 2 cars. I named 8...which all but one are TRACK DUTY ONLY cars. Which means they get ******* FLOGGED when they are driven. Of course, they might also know how to drive so as not to destroy their cars. That's the difference between drivers and good drivers I guess.

You are right, I don't drive my car:
YouTube - Miata @ MSR Cresson

My friend driving it. 223whp/191tq. Tranny isn't broken.



Sorry, I'm driving it this time. Made about 25 passes, ran a best of [email protected] 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?
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Old 02-12-2009, 12:20 AM   #19
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I will be 400+ and I'm going to be using a 6-speed. I don't anticipate having any issues with it.
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Old 02-12-2009, 12:36 AM   #20
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Quote:
Originally Posted by ray_sir_6 View Post
How many other MT rumors do I need to shatter before people stop arguing and start listening?
Rumor? Get fucked. I broke one at 219whp/201wtq. Just because you haven't broken one doesn't suddenly make every other case invalid. People routinely break the 5-speed at around 250whp, and sometimes less.

The only rumors are the ones you spread. The 5-speed is not reliable at 350whp - period.
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