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Old 11-21-2009, 09:52 PM   #1
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Default 6-speed/3.63 speedo gear fail *Now with more win than ever!!!*

so I tried to swap speedo gears today so the grossly inaccurate speedo read correctly. At 110mph, it reads 82mph.

I bought m503-17-441 as instructed on M.net, but the little plastic gear is smaller than the one that came out of the 6-speed. I should also note that the blue gear provided from Mazdaspeed is too small too.

the gear on the left game out of the car, the one on the right came from Mazda with the part # listed above. What did I do wrong?
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6-speed/3.63 speedo gear fail  *Now with more win than ever!!!*-14mdymw.jpg  

Last edited by hustler; 09-06-2011 at 08:23 PM.
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Old 11-21-2009, 09:59 PM   #2
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ok, so what offset mount part # do I need because surprise surprise, Mazdaspeed sent the wrong one.
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Old 11-21-2009, 10:17 PM   #3
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Is the white gear have 19 teeth
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Old 11-21-2009, 10:44 PM   #4
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Is the white gear have 19 teeth
m503-17-441 is the red gear I have in it now per Bill W.
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Old 11-21-2009, 10:46 PM   #5
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Can the rubber seal in the housing not leak, yet still be deep enough to get the position right?
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Old 11-21-2009, 11:02 PM   #6
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I searched for this a while ago after picking up the 3.6 gears. Not sure if I trust it, but here are some part #s.

MX-5 Miata Forum - View Single Post - Gear Ratios

edit: Searching for ---- shows some pages where other people identify it for 3.6 gears.

edit edit: I doubt this is the right one.

Last edited by orion4096; 11-22-2009 at 12:11 PM.
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Old 11-21-2009, 11:07 PM   #7
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I used an M502-17-441 gear as I read that the M503 is good for larger wheels, such as 17". But it probably doesn't make a huge difference overall.

This is what I used to build the gear setup:

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.

Hustler, I think the 1st part number listed will get you what you need to finish the project. I recommend at least getting the spring pin as well because knocking the old one out is a royal pain.
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Old 11-21-2009, 11:53 PM   #8
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Simple solution is to be a man and sell your 3.636s for a real gear ratio (3.909).
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Old 11-22-2009, 12:13 AM   #9
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Just for you Trey I just now pulled the speedo gear from my 6-speed that I use with a 3.636 R&P. According to a GPS at steady state cruise the speedo is within 1-2 MPH @ 80 mph with 205/50/15 tires. If I can still see clearly through the Hornitos goggles it is a 20 tooth gear. Pictures here...
Picasa Web Albums - John - speedo gear

In payment for my awesomeness you will send three members of your harem, the female harem, immediately to the Starbucks at 1604 and 281, where one of my slaves will pick them up and bring them to me for the rest of the weekend. Females are subject to approval of course, send pictures within the next hour. You will probably not want them back when I am done due to my relative awesomeness; they will be incurably spoiled.

+1 on the above about swapping gears. The sending unit offset has to be right too or that **** will not mesh properly, quite unlike my ***** will be meshing with the backdoors of your ill-fated three.

I just counted the teeth on the white gear in your picture; I count 19, Hornitos notwithstanding.
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Old 11-22-2009, 03:50 AM   #10
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Thanks gays. I'll work on this again tomorrow. I wish I could get the rar up the trans up high enough that it didn't puke all the gear oil out.
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Old 11-22-2009, 04:14 AM   #11
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In payment for my awesomeness you will send three members of your harem, the female harem, immediately to the Starbucks at 1604 and 281, where one of my slaves will pick them up and bring them to me for the rest of the weekend. Females are subject to approval of course, send pictures within the next hour. You will probably not want them back when I am done due to my relative awesomeness; they will be incurably spoiled.
Do you want non-english speaking ******?
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Old 11-22-2009, 04:16 AM   #12
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Thanks gays. I'll work on this again tomorrow. I wish I could get the rar up the trans up high enough that it didn't puke all the gear oil out.
easy just put your hand under the diff and push up newb. better eat your damn wheaties next time.
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Old 11-22-2009, 10:24 AM   #13
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The housings and gears are matched pairs by application. This is a hustler fail because I built at least a dozen of these and have shared the part requirements more than once.
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Old 11-22-2009, 11:57 AM   #14
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I worked with the guy at Miataroadster for months trying different combos of housing and gears, none of them worked. I'd be curious to see what your combo is and have you personally seen it work?
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Old 11-22-2009, 11:59 AM   #15
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Quote:
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Do you want non-english speaking ******?
Engrish not required
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Old 11-22-2009, 12:03 PM   #16
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I worked with the guy at Miataroadster for months trying different combos of housing and gears, none of them worked. I'd be curious to see what your combo is and have you personally seen it work?
the 3.90 gear that came in it worked....looks like that goes back in today.
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Old 11-22-2009, 03:59 PM   #17
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Quote:
Originally Posted by thymer View Post
I worked with the guy at Miataroadster for months trying different combos of housing and gears, none of them worked. I'd be curious to see what your combo is and have you personally seen it work?
Yes, built and tested on my car. Running on plenty of other cars--I ran a group buy when I was at mazmart, sold lots of them. I also provided Rotornut with his.
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Old 11-22-2009, 04:19 PM   #18
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I did some gear engineering back in the day. You can think of a set of meshing gears as two wheels rolling on each other. If the center-to-center distance between the two gear axes is too close they will jam and/or break something, and if too far apart they will not mesh correctly, or at all.
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Old 11-22-2009, 04:38 PM   #19
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Holy crap you had to list your gear engineering history to say that gear mesh is important?
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Old 11-22-2009, 10:19 PM   #20
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Quote:
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Holy crap you had to list your gear engineering history to say that gear mesh is important?
lolz
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