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Old 07-03-2013, 11:20 PM   #41
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Originally Posted by Leafy View Post
Thats super easy. Miata roadster shifter takes care of that.
I got one. It does feel better but still not great.

The trans that is in there is suppose to be a fresh rebuild. There has to be someone who blueprints these things to make em shift like they should.
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Old 07-07-2013, 03:37 PM   #42
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I got one. It does feel better but still not great.
I had the same experience, lots of misshifting 4 - 5 and 5 - 4, also with shortshift
Finally decided to go back to 5-speed and will downtune crancktorgue from 250 lbf ft to 235 lbf ft and hope it lasts a little longer.

Laur3ns uses a Quaife set and claims that none of these sets broke on turbo- Miatas, though when I contacted Quaife thy told that these sets where not stronger then OE gearkit
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Old 07-08-2013, 01:45 AM   #43
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I had the same experience, lots of misshifting 4 - 5 and 5 - 4, also with shortshift
I am going to work on a idea I have to solve the problem. It will involve isolating 3-4 & 5-6 into a H pattern while on track and locking out 1-2 and reverse. Accessing 1-2 or reverse can still be done but not without a deliberate motion to do so. The tracks I drive 3-6 is all I need. Being able to move the shifter side to side in the H gate and coming up against a guide limiting the motion should solve the problem for me.
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Old 07-08-2013, 03:55 PM   #44
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so has anyone actually broken a Quaife gearset? i am just going to put another 6 speed in for now and see how it goes. be interesting to know what sort of temperatures it is seeing.

If a quaife gearset is going to do the job i will sort one out over the winter.
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Old 07-08-2013, 04:42 PM   #45
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Laur3ns uses a Quaife set and claims that none of these sets broke on turbo- Miatas, though when I contacted Quaife thy told that these sets where not stronger then OE gearkit
??? I have not heard this. Are you sure they were not referring to something other than the gears themselves?
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Old 07-08-2013, 05:24 PM   #46
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??? I have not heard this. Are you sure they were not referring to something other than the gears themselves?

Thank you very much for your enquiry; we do not offer power or torque figures for our gearkits as these are fitted to standard maincases and utilise standard parts. The QKE3K gearkit is in stock and available for £1,520.00 GBP plus VAT (if applicable) and delivery.


If you would like to proceed with an order please can you provide me with the following information; full name/company name, invoice/delivery address, VAT number (if applicable) and your telephone number.


Kind regards

Adrian Naish


Quaife Technical Sales



This was the reply I received from Quaife UK
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Old 07-08-2013, 06:10 PM   #47
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That seems to be a reasonable response I suppose. My interpretation is that there are other components in the transmission that may fail as the result of much higher horsepower levels, and it is unknown exactly what and when such failure would occur with the Quaife gears.
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Old 07-08-2013, 06:40 PM   #48
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Exactly, they don't say that they are not stronger - they just don't make ANY claims.
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Old 07-08-2013, 07:36 PM   #49
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This was the reply I received from Quaife UK
Way to create a false rumor, dude. "We don't provide strength estimates" is NOT the same as "they are not stronger than stock".

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Old 07-09-2013, 04:08 AM   #50
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Way to create a false rumor, dude. "We don't provide strength estimates" is NOT the same as "they are not stronger than stock".

Well thank you for your acusation, dude. I guess you think I benefit from creating rumors ?

I also had a conversation on the phone with Quaife and there I was told that in the end they couldn't guarantee that it could take more power as the OE gearbox. It was suggested that if I needed to transmit that kind of power that I should take one of there other boxes.

Weather the box breaks from the Quaife gears or the applied OE parts the end-result for me is the same; a broken gearbox
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Old 07-09-2013, 06:33 PM   #51
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so who has what gearbox?
how much power/troque?
what sort of use?
how long has it been in there?

mine is/was:

6 speed
~400bhp ~350ft lb
track only race use
lasted 1 season + track and test days. stripped 4th on the dyno (was at 360/330 for that season)
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Old 07-09-2013, 06:42 PM   #52
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Well thank you for your acusation, dude. I guess you think I benefit from creating rumors ?
I never said that, and I don't take kindly to people putting words in my mouth.

What I said (specifically) is that you created a false rumor, and that's true. You said that "when I contacted Quaife thy told that these sets where not stronger then OE gearkit", when in reality, Quaife told you that "we do not offer power or torque figures for our gearkits". These two statements do not say the same thing, and your public misinterpretation of Quaife's statement did this community a significant disservice.

I doubt you deliberately intended to misrepresent Quaife's statement, but the fact remains that you did, and that's not cool.

Last edited by Savington; 07-09-2013 at 06:55 PM.
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Old 07-09-2013, 07:20 PM   #53
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I 'll stick to reading to avoid offending someone
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Old 07-10-2013, 01:06 AM   #54
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Originally Posted by mr2daj View Post
so who has what gearbox?
how much power/troque?
what sort of use?
how long has it been in there?

mine is/was:

6 speed
~400bhp ~350ft lb
track only race use
lasted 1 season + track and test days. stripped 4th on the dyno (was at 360/330 for that season)
Broke two 6 speeds at slightly under those values in 3 years one tossed a bearing or something the other broke 4th gear. 5 speeds were down to lasting a day or two, second third or the secondary shaft drive gear Iíve broke eight of them.

I hate the way 6 speeds shift. Miata roadster shifter helped immensely. But surprisingly the Mazdaspeed 6 speed feels way crisper than the normal 6 speed Seems like itís got stronger detents or something.

Six speed with 3.636 gears has decent ratios for the track. But second gear is too low for SSM autocross. Iím thinking a 2 or thee speed small light dog box would be the sweet setup for SSM or XP autocross but unless you can find a super tall rear end ring and pinion you need an overdrive gear on the track with that much power.
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Old 07-10-2013, 01:21 AM   #55
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With all of the gearbox carnage I am surprised nobody has addressed cooling. It is a well know fact a gear box will live a longer happier life if run cooler. I keep meaning to log the trans and diff with my AIM system and see what we are truly dealing with. I have a feeling it's not gonna be pretty.

The six speed has lots of ribs that could act as cooling fins if cool air was directed to it. Isolating the exhaust from the trans with heat shields would do wonders as well. Those two alone maybe enough to extend service life and minimize breakage. Obviously a real trans/diff cooler setup would be ideal though.
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Old 07-10-2013, 01:52 AM   #56
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Originally Posted by k24madness View Post
With all of the gearbox carnage I am surprised nobody has addressed cooling. It is a well know fact a gear box will live a longer happier life if run cooler. I keep meaning to log the trans and diff with my AIM system and see what we are truly dealing with. I have a feeling it's not gonna be pretty.

The six speed has lots of ribs that could act as cooling fins if cool air was directed to it. Isolating the exhaust from the trans with heat shields would do wonders as well. Those two alone maybe enough to extend service life and minimize breakage. Obviously a real trans/diff cooler setup would be ideal though.
I've never had burnt transmission fluid just a big bang and clatter which usually happens as the Rpms are just passing through the happy peak torque point.
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Old 07-10-2013, 02:03 AM   #57
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I've never had burnt transmission fluid just a big bang and clatter which usually happens as the Rpms are just passing through the happy peak torque point.
Same here in the 6speed that I killed in Theseus - stripped 4th gear at peak torque. We know the fluid gets hot, but we also know it doesn't burn or degrade (as long as you're using good fluid, i.e. Amsoil MTG). Keeping things cooler should improve case flex, which will keep the shafts aligned better, and that should improve reliability. It was on my list of things to develop before I stopped running Theseus to focus on PTE development, and it will be one of the first things I develop after I get Theseus back up and running again.

The 6-speed will be easy, since both the drain and feed are on the sides. Replace both with -AN adapters, wire a Tilton gear oil pump, fittings, and a Setrab mounted in a crafty location with some ducting. A DIY kit from us with a 10-row Setrab would be ~$500. Wire it to a thermoswitch if you're lazy or a manual switch if you're not. The 5-speed will be much tougher, since the drain is on the bottom and thus won't accept an adapter fitting unless you want to run the very real risk of breaking it off on a curb someday. The answer there may, unfortunately, be welding a bung into the case.
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Old 07-10-2013, 02:42 AM   #58
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It's worse than that - TrackDayHookey stuck a temp probe in his and measured fluid temps of over 340*F.

I sent my oil into Blackstone when I popped my tranny last year - no insolubles or viscosity breakdown, so the fluid isn't actually "overheating", but IMO a cooler would probably still help. If we can keep bearing temps down and keep the gears meshed better, reliability/longevity goes up.

IMO, track cars over 300whp should consider diff and tranny coolers. Even SM guys see high diff temps. It's something I will get around to this year - we'll have a kit for ~$500 with a pump, cooler, filter, and the necessary fittings.
From the other diff/trans cooling thread.

It would be great to get these temps under 250.
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Old 07-10-2013, 02:48 AM   #59
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Originally Posted by RpmClassics View Post
Well thank you for your acusation, dude. I guess you think I benefit from creating rumors ?

I also had a conversation on the phone with Quaife and there I was told that in the end they couldn't guarantee that it could take more power as the OE gearbox. It was suggested that if I needed to transmit that kind of power that I should take one of there other boxes.

Weather the box breaks from the Quaife gears or the applied OE parts the end-result for me is the same; a broken gearbox
Here's a link to a thread @ miata.net I started a few years back. Read through that thread and most if not all of your questions regarding the Quaife gear set should be answered. If not, post or PM and I'll be happy to try to help. Syncromesh gear kit for racing/FI applications - MX-5 Miata Forum
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Old 07-10-2013, 09:19 AM   #60
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I've never had burnt transmission fluid just a big bang and clatter which usually happens as the Rpms are just passing through the happy peak torque point.
The fluid might not be burnt, but over temp fluid still has worse lubricating properties and therefore will increase wear on the transmission.
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