Another 6 speed bites the dust. - Page 13 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-11-2013, 06:28 PM   #241
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Originally Posted by kaisersoze View Post
Many have pointed out that most of the tranny swap options have shitty ratios, so what would your ideal ratios be?
Using 3.636/3.909s depending on power (3.909s up to ~350whp, 3.636s above that), something along the lines of:

1.5 (5.5/5.9)
1.2 (20% drop)
1.0 (~17% drop)
.85 (15% drop)

If those ratios come in the form of a 5-speed with a short 1st, or a 6-speed with two useless ratios above and/or below, or even in the form of a T101A with the 0.85:1 ratio in the "1st" position, that's all fine with me.
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Old 11-11-2013, 06:47 PM   #242
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Originally Posted by Savington View Post
Using 3.636/3.909s depending on power (3.909s up to ~350whp, 3.636s above that), something along the lines of:

1.5 (5.5/5.9)
1.2 (20% drop)
1.0 (~17% drop)
.85 (15% drop)

If those ratios come in the form of a 5-speed with a short 1st, or a 6-speed with two useless ratios above and/or below, or even in the form of a T101A with the 0.85:1 ratio in the "1st" position, that's all fine with me.
You could also have the T101A with a gear venders overdrive to get the final gear on there. It would also give you a gear between gears that you can clutchless no-lift shift to if you only needed a bit more speed in a certain section. I havent been able to get an actual weight out of gear venders but it looks like its in the 20 pound range.
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Old 11-11-2013, 08:19 PM   #243
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Originally Posted by Leafy View Post
You could also have the T101A with a gear venders overdrive to get the final gear on there. It would also give you a gear between gears that you can clutchless no-lift shift to if you only needed a bit more speed in a certain section. I havent been able to get an actual weight out of gear venders but it looks like its in the 20 pound range.
35+lbs, last time I checked, and requires a custom driveshaft, and likely won't allow use of a PPF. Terrible idea.

Last edited by Savington; 11-11-2013 at 08:35 PM.
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Old 11-11-2013, 10:06 PM   #244
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Quote:
Originally Posted by Savington View Post
Using 3.636/3.909s depending on power (3.909s up to ~350whp, 3.636s above that), something along the lines of:

1.5 (5.5/5.9)
1.2 (20% drop)
1.0 (~17% drop)
.85 (15% drop)

If those ratios come in the form of a 5-speed with a short 1st, or a 6-speed with two useless ratios above and/or below, or even in the form of a T101A with the 0.85:1 ratio in the "1st" position, that's all fine with me.
With the pending introduction of the 3.308 R&P from MiataRoadster, the use of a 4 speed without overdrive is feasible and opens up cheaper options.

You proposed: (w/3.9)

1.5 (5.85)
1.2 (4.68)
1.0 (3.9)
.85 (3.31)

"Hypothetical" Ratios: (w/3.308)
1.8 (5.95) (Same as 3rd with 3.63)
1.45 (4.80)
1.2 (3.97)
1.0 (3.31)
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Old 11-11-2013, 10:17 PM   #245
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Here are OEM gear boxes with different rear ends for people who don't like the graphical representations already posted:

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Old 11-12-2013, 02:37 AM   #246
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That is good to know now... I bought an MSM tranny with a 3rd gear grind. I've got it torn down and have a 3rd gear, synchro and 3-4 hub sleeve on order. I had a hell of a time getting the 6th hub off and actually destroyed my HB puller. Ended up buying a Snap-on puller off of the truck to get it off. I have a feeling it will be a bear to get back on too. My parts should come in tomorrow, I'll let you know if I come up with a way to get it to go on. I have a 6ft name brand 20 ton press so I shouldn't have trouble getting the whole tranny in the press.
I made my own puller welding a big nut to a piece of plate and drilling three holes in it but yea that thing fits tight. no issues using a 20 ton press to press it on used an oak 4X4 to support the other end of the shaft. got it all together and it seems to shift good on the bench. hopefully I got everything right.

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Old 11-12-2013, 08:33 AM   #247
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Originally Posted by bbundy View Post
I made my own puller welding a big nut to a piece of plate and drilling three holes in it but yea that thing fits tight. no issues using a 20 ton press to press it on used an oak 4X4 to support the other end of the shaft. got it all together and it seems to shift good on the bench. hopefully I got everything right.
Good to hear! I'll probably end up doing it the same way.
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Old 11-15-2013, 10:20 AM   #248
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So, while you are disassembling everything, would you be willing to measure out the synchros?

There has been speculation that the s2000 carbon fiber synchro rings might be a drop in replacement. Which might lead to an even better 6 speed, (at least in shift feel and quality).
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Old 11-15-2013, 11:38 AM   #249
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Originally Posted by glade View Post
So, while you are disassembling everything, would you be willing to measure out the synchros?

There has been speculation that the s2000 carbon fiber synchro rings might be a drop in replacement. Which might lead to an even better 6 speed, (at least in shift feel and quality).

THIS!!!! ^^^

Gear speed makes better than oem synchros
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Old 11-15-2013, 01:50 PM   #250
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what about the 6-speed makes it "stronger" than the 5-speed?
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Old 11-15-2013, 01:52 PM   #251
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what about the 6-speed makes it "stronger" than the 5-speed?
It goes one higher. You know when you're driving in 5th and you need that little bit more to get you over the edge? Well this one goes to 6th.
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Old 11-15-2013, 02:25 PM   #252
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Originally Posted by Leafy View Post
It goes one higher. You know when you're driving in 5th and you need that little bit more to get you over the edge? Well this one goes to 6th.
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Old 11-15-2013, 02:29 PM   #253
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I hope they develop a 7 speed soon. That would be way cool.
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Old 11-15-2013, 02:35 PM   #254
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Take a 5 speed and weld it to a 6 speed. BAM! 11 speed
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Old 11-15-2013, 02:37 PM   #255
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Take a 5 speed and weld it to a 6 speed. BAM! 11 speed
Actually, it would have 30 speeds.
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Old 11-15-2013, 02:38 PM   #256
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Old 11-15-2013, 02:39 PM   #257
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Originally Posted by mx594m View Post
what about the 6-speed makes it "stronger" than the 5-speed?
I dont know fro sure but I have broken seven of the 5-speeds and three of the 6-speeds.

In the five speeds ive broken second gear, third gear, and the primary gears. also had rapid failures like after two weekends.

the six speed I have broken 4th gear twice and screwed up a bearing on the secondary shaft once which might have been caused by a thrust washer for 4th gear breaking off the teeth on the reverse gear teeth on the secondary shaft.

I have never had any issues with Sycro's. don't even see any wear on them.
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Old 11-15-2013, 02:44 PM   #258
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Actually, it would have 30 speeds.
5+6=11

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Old 11-15-2013, 02:46 PM   #259
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Originally Posted by EO2K View Post
5+6=11

Then why does a bike with a 3 speed front and a 7 speed rear have 21 speed? Because you have 30 combinations with a 5 speed and 6 speed welded together.

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Old 11-15-2013, 02:48 PM   #260
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Quote:
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5+6=11

5x6=30
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