Another 6 speed bites the dust.
#202
1st = 50.3 mph
2nd = 77.2 mph
3rd = 100.9 mph
4th = 128.9 mph
5th = 162.3 mph
I haven't bothered to create a gearing chart, but I've never felt it fall out of the powerband with any shift over 6,000 rpm.
#204
Not willing to debate the first statement but, for the record, I'm a Prairie boy who has trouble pronouncing "poutine".
I post when I have something to say (my post count on the other forum isn't that high either, relatively speaking). Also for the record, a quick search revealed that I have posted here about my Torsen travails.
Back on topic: I currently run a billet Guru diff. Sadly, it isn't available anymore, but it's a nice piece and should be significantly stronger than the OEM bits.
I'll also reiterate my fondness for the Quaife gear set. It's not cheap but it's also not $10K. The gearing is good for both autocross and track use and it hasn't protested about all the hard use I've given it over the last 5-6 years.
I post when I have something to say (my post count on the other forum isn't that high either, relatively speaking). Also for the record, a quick search revealed that I have posted here about my Torsen travails.
Back on topic: I currently run a billet Guru diff. Sadly, it isn't available anymore, but it's a nice piece and should be significantly stronger than the OEM bits.
I'll also reiterate my fondness for the Quaife gear set. It's not cheap but it's also not $10K. The gearing is good for both autocross and track use and it hasn't protested about all the hard use I've given it over the last 5-6 years.
#205
Elite Member
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
Honestly I can't figure out how to make the quafe gears ratios work well for dual purpose with my car. Second gear is too tall. That was evedent after watching my car walk all over David de Regts car with his Quafe 4:10 in head to head side by side Pro-Solo competition. Top speed in second is not as important as being in the proper power band most everywhere else on the course. 8500 rpm rev limit fixes the second gear top speed issue.
The other problem with the Quafe wide is second gear is too tall for autocross and too short for a track gear. Best setup I think for the track would be a close ratio with a 3.636. 2nd through 5th looks real close to 3rd through 6th with the six speed just slightly tighter with that setup. Usable second gear for the track that way.
#208
You may be right if you're running a more traditional autocross layout, with more closely-spaced gates. On the wide-open air base runways that we used to run on (before budget cuts made it unavailable for public rental), I was out of 1st before the first gate and pretty much kept it in 2nd gear for the rest of the run. It worked perfectly for me, as I briefly bounced off the rev limiter in a couple of sections and rarely fell out of the power band in the tight sections.
#209
Elite Member
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
I have a GPS-verified 155 mph with my car (there's a story there that I'm not willing to post on a public forum).
You may be right if you're running a more traditional autocross layout, with more closely-spaced gates. On the wide-open air base runways that we used to run on (before budget cuts made it unavailable for public rental), I was out of 1st before the first gate and pretty much kept it in 2nd gear for the rest of the run. It worked perfectly for me, as I briefly bounced off the rev limiter in a couple of sections and rarely fell out of the power band in the tight sections.
You may be right if you're running a more traditional autocross layout, with more closely-spaced gates. On the wide-open air base runways that we used to run on (before budget cuts made it unavailable for public rental), I was out of 1st before the first gate and pretty much kept it in 2nd gear for the rest of the run. It worked perfectly for me, as I briefly bounced off the rev limiter in a couple of sections and rarely fell out of the power band in the tight sections.
With a 7400-8000 rpm rev limit I would hit the rev limiter before the first turning obstacle at a national level prosolo. With an 8500 rpm limit problem solved. 60 foot times not really any better than the competition who was running both traction and launch control but the speed I was traveling at the 60 foot mark was much higher and acceleration rate from there on was faster.
#210
Steven It sounds like you do mostly autocross. Have you ran much track with it and are you happy with the 4th to 5th shift with the .794 5th or do you wish you had the .881 5th of the close ratio quaife? Or with all the torgue is it a non issue?
I really like the 2nd in the close ratio for getting through turn 16 at the ridge, I wouldn't have to short shift as I have to now with the 6spd from 3rd to 4th, I could make it through it in 2nd.
I really like the 2nd in the close ratio for getting through turn 16 at the ridge, I wouldn't have to short shift as I have to now with the 6spd from 3rd to 4th, I could make it through it in 2nd.
#211
I would have to say that I've never felt the need for a shorter 5th gear ratio. At highway speeds, the copious torque will propel me to 'ludicrous speed' in very short order. I rarely feel the need to downshift when cruising.
#212
Elite Member
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
Fast laps at pacific 6 speed 3.636 note: turn 8 taken in 4th gear. short shift to 5th for turn 9. shift to sixth gear going through the turn 10 shoot onto the drag strip. 6th gear all the way to turn 2. 180 degree turn 2 is taken in 5th gear. I gave up on 4th because I was still going too fast for 4th half way round the turn.
This was with the boost turned down to ~14-15psi making ~324 rwhp. to fit in NASSA TT2 with 245/40/15 DOT tires.
Fastlaps at Pacific Raceway NASA TT2 lap record in Turbo Miata 9/14/2013 - YouTube
This was with the boost turned down to ~14-15psi making ~324 rwhp. to fit in NASSA TT2 with 245/40/15 DOT tires.
Fastlaps at Pacific Raceway NASA TT2 lap record in Turbo Miata 9/14/2013 - YouTube
#214
Elite Member
iTrader: (2)
Join Date: May 2008
Location: Portland, Oregon
Posts: 3,468
Total Cats: 365
So it adapting the T56 simply not feasible? I did a quick search but didn't find any definitive answers on why it's not. Engine location compared to an LS simply too different to overcome? What's the issue with mounting the V8 drivetrain to the BP?
#217
Probably closer to 40-45 unless I'm wrong about the 5speed weight. It's ~125 lbs wet for a fbody transmission with bellhousing, shifter, and slave. I still don't think the t56 is the right answer for you guys. They are ridiculously easy to rebuild, though. I've always had my eye on the sequential boxes... they drop a nice amount of weight off the t56.
#218
Elite Member
Thread Starter
Join Date: Jul 2005
Location: Anacortes, WA
Posts: 2,478
Total Cats: 144
Probably closer to 40-45 unless I'm wrong about the 5speed weight. It's ~125 lbs wet for a fbody transmission with bellhousing, shifter, and slave. I still don't think the t56 is the right answer for you guys. They are ridiculously easy to rebuild, though. I've always had my eye on the sequential boxes... they drop a nice amount of weight off the t56.