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Gear Ratio Chart: Help me find out the ratios!

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Old 02-16-02, 02:05 AM
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Exclamation Gear Ratio Chart: Help me find out the ratios!

OK, Well I forget where I found this, but anyways. It's a gear ratio calculator for speed and such. I added 6th gear for the hell of it, and am adding ratios for more and more cars. I want to make it so you can click a button and have the ratios for whatever car brought up.
It's pretty cool

Code:
Reference Data															
Model	1st Generation RX-7					2nd Generation RX-7						3rd Generation RX-7		Miata	626 RWD
Gear Ratios	RX-7	RX-7 12A		RX-7 13B		NA				Turbo II		TT		Miata	
	79-83	1984	1985	1984	1985	86-88	88 con	89-91	89 GTUs	87-88	89-91	93-95		90-97	79-82
1st Gear	3.674	3.622	3.622	3.622	3.622	3.475	3.475	3.475	3.475	3.483	3.483	3.483		3.136	3.214
2nd Gear	2.217	2.186	2.186	2.186	2.186	2.002	2.002	2.002	2.002	2.015	2.015	2.015		1.888	1.818
3rd Gear	1.432	1.419	1.419	1.419	1.419	1.366	1.366	1.366	1.366	1.391	1.391	1.391		1.330	1.296
4th Gear	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000		1.000	1.000
5th Gear	0.825	0.758	0.807	0.807	0.711	0.711	0.711	0.697	0.756	0.762	0.756	0.719		0.814	0.860
Reverse						3.493	3.493	3.493	3.493	3.288	3.288				
Final Drive					4.1	3.909	4.1	4.3	4.1	4.1	4.1
The formatting is a little off but it looks great in Excel. I would love if anyone could fill in the gears I don't have, like reverse and final drive, or if you know gear ratios for any other cars that might have an interest (HKS dog boxs, MK3 MK4 supras, mr2, celica, different types of miatas, skyline, etc etc, mainly japanese sports cars, cosmos would be good too, along with auto gear ratios)

Last edited by Node; 02-16-02 at 02:10 AM.
Old 02-16-02, 03:48 AM
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http://home.attbi.com/~meanrex7/Ulti...ndRX-7Info.xls
btw, but PLEASE help and give me information to enlarge the chart. btw its two pages.
Old 02-16-02, 03:54 AM
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Final drive on the SA/FB's is 3.909 except for the GSL-SE which is a 4.076
Old 02-16-02, 04:00 AM
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btw, why do i have both 84 and 85 13Bs in FBs?
I thought it was only 13B in GSL-SE which was 85.
I didn't put the first of the chart together
Old 02-16-02, 04:04 AM
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GSL-SE was introduced in 84...
Old 02-16-02, 11:26 AM
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Close Ratio gear sets for FD and FC

OS Geiken 1-3rd gear Close Ratio Mission gear set

1st 2.714
2nd 1.742
3rd 1.267

R-Magic and Anniversary Racing 1-3rd gear Close Ratio Mission gear set

1st 2.887
2nd 1.996
3rd 1.397
Old 02-28-02, 04:18 AM
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check out the guru sites for some more

www.gurumotorsports.com
Old 02-28-02, 11:45 AM
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More info to expand your xls sheet.
93+ MX6/626 ratios are
1st 3.307
2nd 1.833
3rd 1.31
4th 1.03
5th 0.795

Final 4.105
Tire Size 205/55R15
Old 02-28-02, 12:14 PM
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FYI, sheet 1 cells K8 and K34 are incorrect. Also your second case on sheet 1 is using case A's gears and tire size.
Old 02-28-02, 03:37 PM
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Originally posted by Node
http://home.attbi.com/~meanrex7/Ulti...ndRX-7Info.xls
btw, but PLEASE help and give me information to enlarge the chart. btw its two pages.
Nice job Node.
I had done something like yours in excel.
I think you have done a better job.

Since then I have been working on this HTML script.
It was set up for 1986 & later RX7s:
http://home.att.net/~rotarymoe/Top_end_mph.html
Old 02-28-02, 03:49 PM
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Originally posted by 95MX6
More info to expand your xls sheet.
93+ MX6/626 ratios are
1st 3.307
2nd 1.833
3rd 1.31
4th 1.03
5th 0.795

Final 4.105
Tire Size 205/55R15
I heard that on of the Ford Probes had closer gears.
Does anyone have these ratios?
Old 02-28-02, 05:04 PM
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Originally posted by moespeed


I heard that on of the Ford Probes had closer gears.
Does anyone have these ratios?
The 93-97 Probe GT has the same 1-5 ratios but a different final (4.388) to compensate for larger tires (225/50R16). It works out to almost identical gearing.

Old 02-28-02, 06:43 PM
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Thanks for the info.
The closer ratio may be with the earlier mobel MX6GT & ProbeGT (Pre 93)...
Old 02-28-02, 06:54 PM
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Originally posted by 95MX6
FYI, sheet 1 cells K8 and K34 are incorrect. Also your second case on sheet 1 is using case A's gears and tire size.
Node, I udated sheet as per 95MX6. I also added Tire height info. See attached
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