Another 6 speed bites the dust.
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From: Anacortes, WA
After looking at the 6 speed 3.3 combo on the gear calculator i wonder if this combo will hurt the 6 speed due to the added stress. i have blown the 5 speed when shifting to second and once in 3rd. I wonder since we have just turned the 6 speed ratios much the same as the 5 speed if there will be a reduction in the ability for the 6 speed to hold the power. any thoughts??? for those blowing 6 speeds did you have the 3.6 combo ?? i have personally seen a 6 speed get abused with flat shifting and the boost at 20 psi 300whp and it held up fines for many drag races. they had a 4.10 rear ratio tho. anyone here about the retainer spring upgrades that some spec miata builders use??
here a video on you tube.
here a video on you tube.
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From: Anacortes, WA
The gear teeth don’t chip off when you slam it in gear. They break when in gear and accelerating through the peak torque operating point of the engine.
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From: Anacortes, WA
Exactly. A 3.909 gives plenty of top end speed even up to 400 hp and better usability of 5th. 5th can't be broken it doesn't involve any gears so it has lower drivetrain loss as well. Anything taller than that is only necessary for better usage of first and second gear which are never gears used on a track anyway. Unfortunately I need a 3.636 to have a usable autocross gear with second.
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My experience "slamming" has little or nothing to do with it. It is more the amount of time spent at elevated torque levels.
The gear teeth don’t chip off when you slam it in gear. They break when in gear and accelerating through the peak torque operating point of the engine.
The gear teeth don’t chip off when you slam it in gear. They break when in gear and accelerating through the peak torque operating point of the engine.
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From: Anacortes, WA
My thinking re: slamming into gear was that the tires breaking traction limits the torque and torque shock transmitted through the tranny. A taller rear will increase the torque at the prop shaft during wheelspin. However if it is as you say then the rear ratio has no effect on the torque passing through the tranny.
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...ALSO I think the strength issue of 4th gear is dramatically diminished if the car doesn’t see the track. Almost never do you get the opportunity to do a full power run through the rev range in 4th gear for any kind of sane street driving even if you typically drive like a jackass every day to work. Especially combined with super sticky DOT Slick tires whereas on a track you could do it 3 or 4 times per lap.
When dyno tuning, my pulls were in 4th gear. Obviously, dyno tuning requires several full power pulls through the rev range. I am guessing future dyno tuning should be done in 3rd or 5th gear once the 3.3 is installed? If so, is 3rd preferred over 5th or vice versa (from a failure perspective)? This may be even more important if I ever go the EFR 6758 etc. route.
Last edited by 05pearl; Dec 21, 2013 at 06:22 PM.
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Shock loading the transmission and drivetrain by no-lift shifting and/or sidestepping the clutch definitely can break gear teeth.
Doing both can break a lot of things.
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I am going to be installing the 3.3. My car is a street car, not a track car. The above raises the following question, especially for those with even higher TQ levels than mine (320wtq):
When dyno tuning, my pulls were in 4th gear. Obviously, dyno tuning requires several full power pulls through the rev range. I am guessing future dyno tuning should be done in 3rd or 5th gear once the 3.3 is installed? If so, is 3rd preferred over 5th or vice versa (from a failure perspective)? This may be even more important if I ever go the EFR 6758 etc. route.
When dyno tuning, my pulls were in 4th gear. Obviously, dyno tuning requires several full power pulls through the rev range. I am guessing future dyno tuning should be done in 3rd or 5th gear once the 3.3 is installed? If so, is 3rd preferred over 5th or vice versa (from a failure perspective)? This may be even more important if I ever go the EFR 6758 etc. route.
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Thread Starter
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From: Anacortes, WA
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Thread Starter
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From: Anacortes, WA
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Joined: Aug 2009
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From: Sun Prairie WI
Just finishing up my build and found this post and the other 6 speed post. These two post have me worried and after some research I found this. Seams like a good high HP and T fix. I emailed them and I
Was informed this will fit in the Mazda box. They will even make custom hear ratios. It's a lot cheaper then the Nismo box as well.
http://www.par-engineering.com/Products/Catalog/ProdID/410/CatID/120/FS6R92A_1st5th_Synchromesh_Engagement_gearset.aspx
Sorry thought it better belonged here.
Was informed this will fit in the Mazda box. They will even make custom hear ratios. It's a lot cheaper then the Nismo box as well.
http://www.par-engineering.com/Products/Catalog/ProdID/410/CatID/120/FS6R92A_1st5th_Synchromesh_Engagement_gearset.aspx
Sorry thought it better belonged here.
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So did anyone run the Nismo AZ6 / S15 box?
Nismo 6 Speed Transmission SR20DET S13 S14 S15
https://www.dropbox.com/s/vzrbvaxxw9...ation.pdf?dl=0
Trying to put together a transmission resource here:
https://docs.google.com/spreadsheets...it?usp=sharing
Nismo 6 Speed Transmission SR20DET S13 S14 S15
https://www.dropbox.com/s/vzrbvaxxw9...ation.pdf?dl=0
Trying to put together a transmission resource here:
https://docs.google.com/spreadsheets...it?usp=sharing
Last edited by vtjballeng; Jun 8, 2016 at 01:01 PM.
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