Another 6 speed bites the dust.
10-21-2013, 10:51 AM
#121
Also, what's the consensus on upgrades for the 3rd gear synchro? Mine seems to be getting a little crunchy if driven angrily. Fresh fluid made minor differences, ( I have the MS box, though I'm quite confident that makes no difference).
And, bbundy. My offer still stands. Once you have figured out the route you would like to take, money will be on it's way.
And, bbundy. My offer still stands. Once you have figured out the route you would like to take, money will be on it's way.
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10-21-2013, 11:30 AM
#122
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I really like the S15 6 speed for the street. There's one on ebay for $449, if the guts swap out that should end up cheaper and give you a taller 6th than a 3.63 swap. It looks even more attractive when you consider you could sell the S15 transmission with miata guts for little or no loss when you were done with it.
.767 is stupid with the other gears for track use. ever driven a car floored in at redline in a gear but if you shift to the next higher gear and floor it slows down? They put that gear in for low rpm freeway cruising not using on a racetrack.
Last edited by bbundy; 10-21-2013 at 03:57 PM.
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10-21-2013, 11:50 AM
#123
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I have thought of this as well. Since piston engines don't generate power smoothly, but rather in a series of violent pulses like an air-impact ratchet, it would follow that removing the compliance and impulse smoothing would lead to higher momentary forces. An unsprung clutch, hard motor mounts, hard diff mounts, and, to a lesser degree, hard rear suspension bushings could contribute to the intensity of each impact.
Example: Lay a wheel bearing race on an anvil and strike it with a hammer and it leaves a pretty good dent in it. Put the race on a wood block and strike it and it doesn't hurt it nearly as bad. Put the race on a rubber block (like an old diff bushing) and strike it with the hammer and you will not hurt it much at all. The same amount of force was absorbed all three times with significantly different results to the metal race.
Driver comfort isn't the only reason a factory engineer builds compliance into any drivetrain. Component stress and fatigue life is a consideration.
Example: Lay a wheel bearing race on an anvil and strike it with a hammer and it leaves a pretty good dent in it. Put the race on a wood block and strike it and it doesn't hurt it nearly as bad. Put the race on a rubber block (like an old diff bushing) and strike it with the hammer and you will not hurt it much at all. The same amount of force was absorbed all three times with significantly different results to the metal race.
Driver comfort isn't the only reason a factory engineer builds compliance into any drivetrain. Component stress and fatigue life is a consideration.
FWIW however The S15 uses a sprung dual mass flywheel with a rigid clutch disk.
Last edited by bbundy; 10-21-2013 at 02:54 PM.
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10-21-2013, 11:57 AM
#124
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Doing a shitload of research in the meantime however.
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10-21-2013, 02:14 PM
#125
Right now I'm going to try to use an S15 box and swap parts over. I currently have no money in the parts racing account budget till the beginning of next month. Id gladly accept a donated S15 transmission at any time. they seem to cost around the same as Miata 6 speeds.
Doing a shitload of research in the meantime however.
Doing a shitload of research in the meantime however.
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10-21-2013, 02:49 PM
#126
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FWIW as near as I can tell the internals of the new BRZ/FRS might also be the same as the S15 box.
Bob
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10-22-2013, 06:37 AM
#127
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As a former lsx guy, t56's were designed to operate with the power levels you have and then some in 1k lb+ heavier cars with big meaty tires.
Rx7 guys are adapting them to FD's because their transmission can't handle the torque. I'd imagine a junkyard stocker with low miles would be perfectly fine behind your 350lb/ft.
FD transmission solution for 500+ hp - RX7Club.com
Rx7 guys are adapting them to FD's because their transmission can't handle the torque. I'd imagine a junkyard stocker with low miles would be perfectly fine behind your 350lb/ft.
FD transmission solution for 500+ hp - RX7Club.com
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10-22-2013, 09:47 AM
#129
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The shifter in the f-body's isn't that great and it was hampered by a terrible slave cylinder in 99-00. 01+ got a newer design and shifted noticeably smoother. I never had any trouble in the probably 10+ t56 cars at stock power levels I've driven powershifting. Drove a ls1/t56 drift 240 making 390 this summer and it was glorious.
What about the aisin ar5 trans in the Solstice/Sky? Isn't that basically a MIII Supra trans? Those seem to live behind the turbo ecotec pretty well.
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10-22-2013, 11:36 AM
#130
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I know it is... but having a reliable drivetrain sure is nice. It's going to take x amount of beef to handle x amount of lb/ft.
The shifter in the f-body's isn't that great and it was hampered by a terrible slave cylinder in 99-00. 01+ got a newer design and shifted noticeably smoother. I never had any trouble in the probably 10+ t56 cars at stock power levels I've driven powershifting. Drove a ls1/t56 drift 240 making 390 this summer and it was glorious.
What about the aisin ar5 trans in the Solstice/Sky? Isn't that basically a MIII Supra trans? Those seem to live behind the turbo ecotec pretty well.
The shifter in the f-body's isn't that great and it was hampered by a terrible slave cylinder in 99-00. 01+ got a newer design and shifted noticeably smoother. I never had any trouble in the probably 10+ t56 cars at stock power levels I've driven powershifting. Drove a ls1/t56 drift 240 making 390 this summer and it was glorious.
What about the aisin ar5 trans in the Solstice/Sky? Isn't that basically a MIII Supra trans? Those seem to live behind the turbo ecotec pretty well.
Aisin AY transmission - Wikipedia, the free encyclopedia
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10-22-2013, 11:55 AM
#131
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What about the aisin ar5 trans in the Solstice/Sky? Isn't that basically a MIII Supra trans? Those seem to live behind the turbo ecotec pretty well.
In general, there are several options out there that are cheap, strong, heavy, and have awful gear ratios. I want an option that is strong, light, and has good gear ratios, and I'm willing to sacrifice cheap to get it.
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10-22-2013, 12:19 PM
#132
Expanding options to what won't bolt up without significant fabrication I was leaning to the AY6.
Aisin AY transmission - Wikipedia, the free encyclopedia
Aisin AY transmission - Wikipedia, the free encyclopedia
But this post list other ratios for Caddy CTS. Mix and match?
But six year old webfacts is just that, webfacts.
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10-22-2013, 12:44 PM
#133
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IMO, the idea of adding 50+lbs to the car to get a reliable transmission isn't an acceptable one.
Ever driven one? The ratios are awful. Worse than the TII box. 3.75:1, 2.26:1, 1.37:1, 1.00:1, 0.73:1. Drive an AZ6 sometime, but drive it without 3rd gear - that's what an AR5 feels like.
In general, there are several options out there that are cheap, strong, heavy, and have awful gear ratios. I want an option that is strong, light, and has good gear ratios, and I'm willing to sacrifice cheap to get it.
Ever driven one? The ratios are awful. Worse than the TII box. 3.75:1, 2.26:1, 1.37:1, 1.00:1, 0.73:1. Drive an AZ6 sometime, but drive it without 3rd gear - that's what an AR5 feels like.
In general, there are several options out there that are cheap, strong, heavy, and have awful gear ratios. I want an option that is strong, light, and has good gear ratios, and I'm willing to sacrifice cheap to get it.
Last edited by bbundy; 10-22-2013 at 01:35 PM.
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10-22-2013, 03:05 PM
#134
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I'm still not convinced the Nismo isn't going to puke on you either as you'll be running right at it's 'limits'.
Just fork out the extra $3K above your $10k and be the Baus... I'm applying for new Visa right now
Quaife QBE69G - for when the QBE60G isn't enough... the 60G is only rated at a MAX 300 lbft and 375 bhp...
The 69G is good for over 750bhp (didn't list torque) and come in several different gear ratio options. I think this is best with 2.759 1st gear?
Straight cut (o/d) 2.435 1.858 1.494 1.217 1.000 0.870
Option (o/d) 2.759 2.050 1.565
Yours today for only $13,000
In action:
Alright - time to pull head out of the clouds...
Just fork out the extra $3K above your $10k and be the Baus... I'm applying for new Visa right now
Quaife QBE69G - for when the QBE60G isn't enough... the 60G is only rated at a MAX 300 lbft and 375 bhp...
The 69G is good for over 750bhp (didn't list torque) and come in several different gear ratio options. I think this is best with 2.759 1st gear?
Straight cut (o/d) 2.435 1.858 1.494 1.217 1.000 0.870
Option (o/d) 2.759 2.050 1.565
Yours today for only $13,000
In action:
Alright - time to pull head out of the clouds...
Last edited by GeneSplicer; 10-22-2013 at 03:29 PM.
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10-22-2013, 04:35 PM
#135
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Dam it don't post videos like that now I’ll be dreaming of having shifting like that for weeks while my ***** turn blue not getting what I want until I can put it out of my mind.
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10-22-2013, 11:30 PM
#137
Right now I'm going to try to use an S15 box and swap parts over. I currently have no money in the parts racing account budget till the beginning of next month. Id gladly accept a donated S15 transmission at any time. they seem to cost around the same as Miata 6 speeds.
Doing a shitload of research in the meantime however.
Doing a shitload of research in the meantime however.
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10-23-2013, 02:48 AM
#139
I'm still not convinced the Nismo isn't going to puke on you either as you'll be running right at it's 'limits'.
Just fork out the extra $3K above your $10k and be the Baus... I'm applying for new Visa right now
Quaife QBE69G - for when the QBE60G isn't enough... the 60G is only rated at a MAX 300 lbft and 375 bhp...
The 69G is good for over 750bhp (didn't list torque) and come in several different gear ratio options. I think this is best with 2.759 1st gear?
Straight cut (o/d) 2.435 1.858 1.494 1.217 1.000 0.870
Option (o/d) 2.759 2.050 1.565
Yours today for only $13,000
Just fork out the extra $3K above your $10k and be the Baus... I'm applying for new Visa right now
Quaife QBE69G - for when the QBE60G isn't enough... the 60G is only rated at a MAX 300 lbft and 375 bhp...
The 69G is good for over 750bhp (didn't list torque) and come in several different gear ratio options. I think this is best with 2.759 1st gear?
Straight cut (o/d) 2.435 1.858 1.494 1.217 1.000 0.870
Option (o/d) 2.759 2.050 1.565
Yours today for only $13,000
Still 10k cheaper than hewland quoted me for a 6 speed sequential w/ reverse. That excluded the custom bellhousing.
Ah well, back to dreaming
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10-23-2013, 09:46 AM
#140
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FWIW, the turbocharged 350z engine I helped a buddy pull recently is mated to a 6-speed. He was making 425whp/435wtq without failure.
But the ratios are:
1st -3.794
2nd -2.324
3rd -1.624
4th-1.271
5th -1.000
6th -0.794
Here are some other ratios available in the Nissans:
Nissan Motor Company Transmission Gear Ratios
But the ratios are:
1st -3.794
2nd -2.324
3rd -1.624
4th-1.271
5th -1.000
6th -0.794
Here are some other ratios available in the Nissans:
Nissan Motor Company Transmission Gear Ratios
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