Gearbox options/experiences
07-07-2013, 03:37 PM
#42
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Join Date: Jan 2009
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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
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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07-08-2013, 01:45 AM
#43
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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07-08-2013, 05:24 PM
#46
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Join Date: Jan 2009
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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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07-08-2013, 06:10 PM
#47
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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07-09-2013, 04:08 AM
#50
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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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07-09-2013, 06:42 PM
#52
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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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07-10-2013, 01:06 AM
#54
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Join Date: Jul 2005
Location: Anacortes, WA
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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 it’s 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. I’m 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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07-10-2013, 01:21 AM
#55
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.
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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07-10-2013, 01:52 AM
#56
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Join Date: Jul 2005
Location: Anacortes, WA
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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.
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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07-10-2013, 02:03 AM
#57
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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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07-10-2013, 02:42 AM
#58
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.
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.
It would be great to get these temps under 250.
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07-10-2013, 02:48 AM
#59
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
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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