Gearbox options/experiences - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Race Prep Miata race-only chat.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 07-02-2013, 11:00 AM   #21
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 8,927
Total Cats: 93
Default

Quote:
Originally Posted by Handy Man View Post
soo.... don't use the stock case!
That skyrockets the cost.
Leafy is offline   Reply With Quote
Old 07-02-2013, 12:46 PM   #22
Junior Member
iTrader: (1)
 
Join Date: Sep 2006
Posts: 201
Total Cats: 11
Default

Quote:
Originally Posted by Savington View Post
Spend a bunch of money swapping an alternate OEM box with shitty gear ratios into the car, or $$buy$$ a Quaife 5sp with gear ratios similar to the 6-speed (i.e. good for road racing). I did the latter and don't regret it yet.
+1
wildo is offline   Reply With Quote
Old 07-02-2013, 12:57 PM   #23
Elite Member
iTrader: (10)
 
soviet's Avatar
 
Join Date: Jan 2010
Location: VA
Posts: 3,514
Total Cats: 253
Default

I have a mazdaspeed box. The shot-peened claim has long been debated, but if it matters, my gears are still intact. AMSOil MTG.
soviet is offline   Reply With Quote
Old 07-02-2013, 01:41 PM   #24
Senior Member
iTrader: (1)
 
Join Date: Mar 2008
Location: Cromwell CT
Posts: 1,078
Total Cats: 46
Default

I think your best bet will be the TII swap or a for big power, Find a G-force GSR four speed. I have a 2002 6speed and it hasnt broken any teeth yet but my 330ftlbs doesnt come in untill 6800 rpm

I could have sworn you guys (sav) had said that the quaife gear set was rubbish due to sticking it into a shitty 5spd case. PPG used to offer 6spd straight cut dog sets.
ctdrftna is offline   Reply With Quote
Old 07-02-2013, 01:44 PM   #25
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 8,927
Total Cats: 93
Default

Quote:
Originally Posted by ctdrftna View Post
I think your best bet will be the TII swap or a for big power, Find a G-force GSR four speed. I have a 2002 6speed and it hasnt broken any teeth yet but my 330ftlbs doesnt come in untill 6800 rpm
The trouble with that T101a based 4 speed is that 4th gear is direct drive, aka its 1:1. So you need an interesting rear end to run it. Of course when you're getting into the 300+ ftlbs of torque area, maybe a change of rear end isnt a bad idea.
Leafy is offline   Reply With Quote
Old 07-02-2013, 01:49 PM   #26
Senior Member
iTrader: (1)
 
Join Date: Mar 2008
Location: Cromwell CT
Posts: 1,078
Total Cats: 46
Default

Quote:
Originally Posted by Leafy View Post
The trouble with that T101a based 4 speed is that 4th gear is direct drive, aka its 1:1. So you need an interesting rear end to run it. Of course when you're getting into the 300+ ftlbs of torque area, maybe a change of rear end isnt a bad idea.
It all depends on the usage. I think for road racing you would want more gears regardless. Unless you have 500+ ftlbs (V8) i cant see roadracing with a 4spd.
For drag or drifting 4speed all the way.
ctdrftna is offline   Reply With Quote
Old 07-02-2013, 03:19 PM   #27
Junior Member
 
Join Date: Jun 2011
Location: Houston
Posts: 409
Total Cats: 16
Default

As long as the ratio's are good and you don't do standing starts, you would be fine with a 4 speed. You just might have a stupid long 1st which would be a b$%#@ to get moving.
Handy Man is offline   Reply With Quote
Old 07-02-2013, 03:25 PM   #28
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 8,927
Total Cats: 93
Default

Quote:
Originally Posted by Handy Man View Post
As long as the ratio's are good and you don't do standing starts, you would be fine with a 4 speed. You just might have a stupid long 1st which would be a b$%#@ to get moving.
If the first was between a 5 speed 2nd and a 6 speed 3rd. Would it really be that bad? You would have to slip clutch/spin tires to launch quickly from a stop and you might want to winch it on the trailer. But from the few times I've spaced out on the street and left the stock miata in 2nd and pulled away from a stop, it wasnt that bad.
Leafy is offline   Reply With Quote
Old 07-02-2013, 03:47 PM   #29
Elite AbsurdFlow Member
 
Laur3ns's Avatar
 
Join Date: Mar 2008
Location: Enschede, NL
Posts: 2,057
Total Cats: 11
Default

I use only 3-5 on most tracks and would not like to shift more often.
Laur3ns is offline   Reply With Quote
Old 07-02-2013, 04:12 PM   #30
Elite Member
iTrader: (2)
 
miata2fast's Avatar
 
Join Date: Aug 2009
Location: Dover, FL
Posts: 2,866
Total Cats: 99
Default

Quote:
Originally Posted by Handy Man View Post
As long as the ratio's are good and you don't do standing starts, you would be fine with a 4 speed. You just might have a stupid long 1st which would be a b$%#@ to get moving.
I do not think an FI car would have a problem.
miata2fast is offline   Reply With Quote
Old 07-03-2013, 03:35 PM   #31
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 13,908
Total Cats: 1,077
Default

Quote:
Originally Posted by miata2fast View Post
I do not think an FI car would have a problem.
I fail to see how forced induction makes any sort of difference (unless you plan to leave every stoplight on boost).
Savington is online now   Reply With Quote
Old 07-03-2013, 03:45 PM   #32
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 8,927
Total Cats: 93
Default

Quote:
Originally Posted by Savington View Post
I fail to see how forced induction makes any sort of difference (unless you plan to leave every stoplight on boost).
It shouldnt matter from a stop light if you're trying to drive the car like a normal human being. Next time you drive a miata just try to accelerate at the same pace as everyone else, but pretend 1st doesnt exist. You rev a couple rpms higher and slip the clutch an extra half a second taking off and the car just feels a little bit slower until you get to 5-10 mph when you'd normally be shifting into 2nd anyways. Without a doubt it will end up reducing the life of the clutch.
Leafy is offline   Reply With Quote
Old 07-03-2013, 04:34 PM   #33
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 13,908
Total Cats: 1,077
Default

Quote:
Originally Posted by Leafy View Post
If the first was between a 5 speed 2nd and a 6 speed 3rd. Would it really be that bad? You would have to slip clutch/spin tires to launch quickly from a stop and you might want to winch it on the trailer. But from the few times I've spaced out on the street and left the stock miata in 2nd and pulled away from a stop, it wasnt that bad.
The problem is that a gear shorter than the 6-speed's 3rd gear is too short for a 300wtq road race car to make any use of on a road course, and leaving that car with only 3 gears isn't acceptable.

A 4-speed T101-based setup would work on a road race car that was winched onto a trailer and was geared for 80-105-135-170mph in 1-2-3-4th. Paddock crawling would be all but impossible, but it would work on track.

This is why I think the 6-speeds and the Quaife boxes have the gearing down pat, and any custom solution should match those ratios within 2mph. The 6-speed gives two crawler gears, the Quaife gives one, but both boxes give 4 usable ratios on track.
Savington is online now   Reply With Quote
Old 07-03-2013, 05:06 PM   #34
hrk
Junior Member
iTrader: (6)
 
Join Date: Oct 2005
Location: Atlanta GA
Posts: 334
Total Cats: 2
Default

Subsrcibed.
hrk is offline   Reply With Quote
Old 07-03-2013, 05:18 PM   #35
Senior Member
iTrader: (6)
 
Join Date: Jun 2010
Location: San Rafael, CA
Posts: 987
Total Cats: 27
Default

Quote:
Originally Posted by Savington View Post
This is why I think the 6-speeds and the Quaife boxes have the gearing down pat, and any custom solution should match those ratios within 2mph. The 6-speed gives two crawler gears, the Quaife gives one, but both boxes give 4 usable ratios on track.
Is there any hope for making a 6 speed shift better? I have never had any issues on track with other cars but this 6 speed is tough!
k24madness is offline   Reply With Quote
Old 07-03-2013, 05:36 PM   #36
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 13,908
Total Cats: 1,077
Default

Quote:
Originally Posted by k24madness View Post
Is there any hope for making a 6 speed shift better? I have never had any issues on track with other cars but this 6 speed is tough!
Some 6-speeds are better than others. MSM boxes seem to shift the best out of all of them. It takes some getting used to, so just slow down your shifts until you stop missing them and then slowly ramp the speed back up. I don't miss shifts in 6-speeds any more than I do in 5-speeds.
Savington is online now   Reply With Quote
Old 07-03-2013, 06:02 PM   #37
Junior Member
iTrader: (1)
 
Join Date: Jan 2009
Location: Bradenton, FL
Posts: 291
Total Cats: 5
Default

Not sure if anyone has seen this company? I've delt with them for FWD G-series stuff but not anything RWD. The dogleg 5speed definatly has me intrigued, seems like much less misshifts would be possble. But being as 5th is 1:1 not sure its usable... They also have dog and syncro engagments for the 6 speed too

MAZDA CPBoost Custom Billet Gears
Sokool is offline   Reply With Quote
Old 07-03-2013, 07:02 PM   #38
Elite Member
iTrader: (2)
 
miata2fast's Avatar
 
Join Date: Aug 2009
Location: Dover, FL
Posts: 2,866
Total Cats: 99
Default

Quote:
Originally Posted by Handy Man View Post
As long as the ratio's are good and you don't do standing starts, you would be fine with a 4 speed. You just might have a stupid long 1st which would be a b$%#@ to get moving.
Quote:
Originally Posted by Savington View Post
I fail to see how forced induction makes any sort of difference (unless you plan to leave every stoplight on boost).
I was referring to Handy Man's post where the game involved a standing start in race conditions.

Higher horsepower per weight cars need taller starting line gear ratios than lower powered cars to maximize their 60' potential.

Last edited by miata2fast; 07-07-2013 at 06:02 PM.
miata2fast is offline   Reply With Quote
Old 07-03-2013, 07:55 PM   #39
Senior Member
iTrader: (6)
 
Join Date: Jun 2010
Location: San Rafael, CA
Posts: 987
Total Cats: 27
Default

Quote:
Originally Posted by Savington View Post
It takes some getting used to, so just slow down your shifts until you stop missing them and then slowly ramp the speed back up.
I am doing better myself but when a noob gets behind the wheel it's zing city. After replacing this motor I would like to make the tranny more user friendly. If not I guess I have to be stingy with seat time.
k24madness is offline   Reply With Quote
Old 07-03-2013, 09:35 PM   #40
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 8,927
Total Cats: 93
Default

Quote:
Originally Posted by k24madness View Post
Is there any hope for making a 6 speed shift better? I have never had any issues on track with other cars but this 6 speed is tough!
Thats super easy. Miata roadster shifter takes care of that.


I looked at CP boost before. Parts made in mexico, lead time of whenever they get around to it. twice as expensive as quaife. It only make sense if you need custom ratios.
Leafy is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Removing speedo sensor from gearbox ThunderFox Suspension, Brakes, Drivetrain 2 09-10-2015 03:19 PM
Loud gearbox vibration rhysmate Suspension, Brakes, Drivetrain 9 08-12-2012 05:43 PM
DIY gearbox rx-7fd 3s with the first side oem gearbox dogits DIY Turbo Discussion 18 03-09-2011 05:18 AM
difference automatic gearbox NA Lazy_g General Miata Chat 2 04-14-2010 03:07 PM
Nissan SR-20DET engine into Miata Big Al General Miata Chat 2 05-23-2008 11:17 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:21 AM.