Another 6 speed bites the dust.
#43
Elite Member
Thread Starter
Join Date: Jul 2005
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Bob
#46
Lesher Motorsports Inc. Spec Miata rentals and builds
I dunno what kinds of work he normally does. He was instructing at the MRLS event (I was pitted next to him), and happened to have a few transmissions in his shop when people needed them.
--Ian
#47
Don't make it complicated. Just call these guys.
Mazda - NA/NB MX5/Miata Roadster : PAR - Precision Automation Robotics
Mazda - NA/NB MX5/Miata Roadster : PAR - Precision Automation Robotics
#49
Confirmed, S1 6spds have shitastick synchros. Last weekend there were 4 S1 RX8s at an SCCA event. 3 of us were nursing a bad 2nd gear synchro. S2s are considered much more reliable, but I don't know if they can be adopted to miata. As for RX7s, it's the 5th gear synchro that explodes so I wouldn't waste money adapting an FD tranny to your miata even though it can handle the power better.
#50
blowed AZ6
Don't make it complicated. Just call these guys.
Mazda - NA/NB MX5/Miata Roadster : PAR - Precision Automation Robotics
Mazda - NA/NB MX5/Miata Roadster : PAR - Precision Automation Robotics
I shipped a pallet full of dead AZ6's to Ron Olsen at BAR in IL about 6 months ago. He's working on a sequential box. Problem is his goal is an EP box so barely able to deal with 180lbs tq. When I told him there was a slightly larger market for turbo Miata guys he was interested.. until I told him it had to survive 400 lbs and 300° for about 30 minutes.
I've heard of guys modifying T5's to hold more torque and adapting them. Those are dirt cheap. Available ratios suck though.
Coolest option is a Quaife QBE60G 6 speed sequential. They even offer a bell housing and input shaft for our B series Mazda engine. Bare bones set up would probably run $9K. Cool guy set up with shifter and electronic controls for anti-overrev, flat shift, etc, would push that to about $13k.
Oh yeah, I have a customer in Australiar that put an RB26 Skyline trans into the Miata. I believe the SR20DETT engines S15 Skyrine used a variant of the AZ6. RB26 was something different.
So yeah, I don't have any answer either.
__________________
#51
G-Force sells gearsets on the order of $1600/set that are rated to 600hp/500tq in a Mustang sized vehicle. That plus a junkyard T5 case for $50, plus the rest of the rebuild parts you'd need, plus the Quicktime bell housing, plus a clutch disc for a Mustang 26-spline input shaft might be an option. You're still going to have a lot of cheddar in it, though.
#52
I shipped a pallet full of dead AZ6's to Ron Olsen at BAR in IL about 6 months ago. He's working on a sequential box. Problem is his goal is an EP box so barely able to deal with 180lbs tq. When I told him there was a slightly larger market for turbo Miata guys he was interested.. until I told him it had to survive 400 lbs and 300° for about 30 minutes.
#53
Confirmed, S1 6spds have shitastick synchros. Last weekend there were 4 S1 RX8s at an SCCA event. 3 of us were nursing a bad 2nd gear synchro. S2s are considered much more reliable, but I don't know if they can be adopted to miata. As for RX7s, it's the 5th gear synchro that explodes so I wouldn't waste money adapting an FD tranny to your miata even though it can handle the power better.
Edit: I don't know many people who own rx7s, that's just what I've been told.
Last edited by Vilko; 10-17-2013 at 01:47 AM.
#54
The 6 speed nissan gearbox from the s15 silvia has a reputation for being quite weak. Far weaker than the earlier 5 speed. People can't agree if its torque or abuse that kills the 6 speed.
Sorry for taking it off topic, just being ----.
#55
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Above 500whp, the first thing that snaps is the input shaft.
FCs have way shittier feel and engagement than FDs. On one particular car, I couldn't tell the difference from a stock Miata 5sp.
#56
quicktime bellhousing + TKO 600?
http://www.summitracing.com/parts/aw...make/chevrolet
you still need a clutch and PPF solution :/
http://www.summitracing.com/parts/aw...make/chevrolet
you still need a clutch and PPF solution :/
#57
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Location: Chesterfield, NJ
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quicktime bellhousing + TKO 600?
http://www.summitracing.com/parts/aw...make/chevrolet
you still need a clutch and PPF solution :/
http://www.summitracing.com/parts/aw...make/chevrolet
you still need a clutch and PPF solution :/
I :heart: my T5. Well...the shifter isn't as nice as the OEM miata, and the .64 5th feels odd but is nice for my 100mile round trip highway commute. I found ~5 different available .73-.90 5th gear options though. I even found a NOS BW .80 set on ebay for dirt cheap <$100 but missed out on it. I snooze I loose.
Astro .73 $192
Astro .78 9310 $279
Medatronics/5speeds.com .81 8620 $250
Gforce .78 (supplied by Astro), .75, .90 $345
Stan at http://www.pro-forceperformance.com/ is very helpful, dealer & price matches the above.
Last edited by TurboTim; 10-17-2013 at 08:43 AM.
#58
Coolest option is a Quaife QBE60G 6 speed sequential. They even offer a bell housing and input shaft for our B series Mazda engine. Bare bones set up would probably run $9K. Cool guy set up with shifter and electronic controls for anti-overrev, flat shift, etc, would push that to about $13k
One of my paddock buddies is running an Elite IL300 6S EVO 2 ($8k) behind a 380bhp Rover 8 and when it has failed it has been vibrations, bolts etc and the service form Elite have been great.
Elite lists a number of Gear kits, so they might be one of many companies to contact for a quote for a set or single pairs of gears.
Would new tougher gears for 3rd and 4th be enough to make the 6sp tough "enough", or would a full set be better to do it right at once (labor etc cost the same regardless of how many gears you change)?
Making 3rd-6th gapped for track, 2nd for standing starts and 1st for loading would be nice. Aiming at 4.1:1 diff to have easily accessible rear end options
Personally I'd be pleased with a 6sp mated to my 4.875. I never see speeds where the 6th would run out on our tracks (at my power level...).
I never got anyone to bite on the flawed option of changing final drive to reduce the torque in the box and move some of the driving breaking 4th into 5th. Would it just make the thing break anyway or would it change the time spent on sensitive gears (breaking less boxes per time bu spending more time in 5th).