3.636 diff installed speedo question...
02-27-2010, 06:15 AM
#1
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3.636 diff installed speedo question...
Just installed a 3.636 diff with 6 speed gearbox. Runs great. only speedo is off. (not only found in australia, europe has them too)
60 km/h on the speedo = 70km/h on GPS
I also looked at the speedo options and found a suitable match. BUT: it was calculated from 92+ miata's using 22teeth speedo gears.
Mine is a 91 model with 20 tooth...
Is there also a difference in the meter itself??
What is my best option for a fairly accurat speedo??
From my calculations:
91 model has 4.3 diff with 20 teeth sensor.
New diff has 3.636
3.636/4.3x20= 17 teeth...
Is that correct???
Can i use a 84-85 speedo from an RX7?? (pnp on miata speedo cable??)
60 km/h on the speedo = 70km/h on GPS
I also looked at the speedo options and found a suitable match. BUT: it was calculated from 92+ miata's using 22teeth speedo gears.
Mine is a 91 model with 20 tooth...
Is there also a difference in the meter itself??
What is my best option for a fairly accurat speedo??
From my calculations:
91 model has 4.3 diff with 20 teeth sensor.
New diff has 3.636
3.636/4.3x20= 17 teeth...
Is that correct???
Can i use a 84-85 speedo from an RX7?? (pnp on miata speedo cable??)
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02-27-2010, 02:55 PM
#2
I was running the same setup. You can choose an M502-17-441 (19 tooth) gear or an M503- (20 tooth) gear, it depends on what wheel/tire combo you are using. With my 205/50R15 my speedometer was barely off compared to the GPS.
This is what I used to build the gear setup (all parts can be ordered from Mazda):
1011-17-442A - This is the sleeve/housing that will position the gear in the proper location to engage the gear within the transmission. If the sleeve that comes in a 5-speed transmission is used, the smaller 6-speed gear will be free-floating and will not engage. Thus, no readings.
M502-17-441 - This is the actual gear.
9922-20-214 - Spring Pin for holding the gear in the sleeve.
9958-60-8166 - Oil Seal for inside the sleeve.
1011-17-443 - O-Ring for the outside of the sleeve.
This is what I used to build the gear setup (all parts can be ordered from Mazda):
1011-17-442A - This is the sleeve/housing that will position the gear in the proper location to engage the gear within the transmission. If the sleeve that comes in a 5-speed transmission is used, the smaller 6-speed gear will be free-floating and will not engage. Thus, no readings.
M502-17-441 - This is the actual gear.
9922-20-214 - Spring Pin for holding the gear in the sleeve.
9958-60-8166 - Oil Seal for inside the sleeve.
1011-17-443 - O-Ring for the outside of the sleeve.
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02-27-2010, 04:22 PM
#5
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I was running the same setup. You can choose an M502-17-441 (19 tooth) gear or an M503- (20 tooth) gear, it depends on what wheel/tire combo you are using. With my 205/50R15 my speedometer was barely off compared to the GPS.
This is what I used to build the gear setup (all parts can be ordered from Mazda):
1011-17-442A - This is the sleeve/housing that will position the gear in the proper location to engage the gear within the transmission. If the sleeve that comes in a 5-speed transmission is used, the smaller 6-speed gear will be free-floating and will not engage. Thus, no readings.
M502-17-441 - This is the actual gear.
9922-20-214 - Spring Pin for holding the gear in the sleeve.
9958-60-8166 - Oil Seal for inside the sleeve.
1011-17-443 - O-Ring for the outside of the sleeve.
This is what I used to build the gear setup (all parts can be ordered from Mazda):
1011-17-442A - This is the sleeve/housing that will position the gear in the proper location to engage the gear within the transmission. If the sleeve that comes in a 5-speed transmission is used, the smaller 6-speed gear will be free-floating and will not engage. Thus, no readings.
M502-17-441 - This is the actual gear.
9922-20-214 - Spring Pin for holding the gear in the sleeve.
9958-60-8166 - Oil Seal for inside the sleeve.
1011-17-443 - O-Ring for the outside of the sleeve.
I have a 91 miata, that already has a 20 tooth gear...
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02-27-2010, 09:49 PM
#6
I wouldn't have posted the information if it didn't answer your question, but because I didn't clarify in my previous post, the 20 tooth gear you have is the wrong diameter and will not work.
I posted this same info when you were having issues with the gears. https://www.miataturbo.net/forum/t41362/
I posted this same info when you were having issues with the gears. https://www.miataturbo.net/forum/t41362/
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