TRANSMISSION RATIO

[MINIMOKE]

Hi Gang,
I just went to a sight called Honda-Tech.com and found a guy that just changed the 5th gears in the tranny and lowered the rpm by almost 2000 when in
5th gear.He got the gears from a 1990/91 acura integra LS.



Minimoke

[duck]

Can you post a link to the forum/post

Thanks

[B20GT]

That does not run a B series unit or box but( unless they have done a swap)

[MINIMOKE]

http://www.honda-tech.com/zerothread?id=555929






MINIMOKE

[VTEC]

Sounds OK if you like that sort of thing,

Personally, i love the revs, can drive all day on the motorway at 6000 rpm and not get fed up of it.......

Useful if you wanna run 10's tho! :twisted:

[VTEC]

Never really noticed much difference when i changed from 10s to 13s on my last Mini. The tyres on 10s are massive....... Not sure what the difference in rolling radius is, but it can't be a lot.....

Theres not much difference between a 165/70/10 and a 175/50/13....but its quite different to the standard Hondas 185/60/14!

[Latka]

Hmm... still got this little voice in the back of my head saying I should try the stock motor (B16a2 probably) with the 10" wheels. Might be worth a go just for laughs if nothing else. I figure I can always "trade up" if I need to!

Think the Cooper S discs would be up to the challenge of stopping the car?

[Latka]

Check this out... used a program called GearCalc to chuck around some ideas. I input the transmission info from the B16A3/4 and used 10" tires:


GearCalc v2.0.0.1 Copyright ©2001, Peter Ogden
Gear Ratio, Speed and RPM Calculator

Gear set: Honda Civic 5 Speed
Gear 1 2 3 4 5 Final
Ratios: 3.307 2.105 1.458 1.107 0.848 4.400

RPM Limit: 8000
RPM @Peak Power: 7800
Tyre Size: 165/70 x 10
Tyre Diameter: 19.09 in
Tyre Circumference: 59.97 in


Gear Mph per 1000 RPM Mph @7800 RPM Mph @8000 RPM
--------------------------------------------------------
1 3.90 30 31
2 6.13 48 49
3 8.85 69 71
4 11.66 91 93
5 15.22 119 122

Gear Change RPM drop (change @7800) RPM drop (change @8000)
-------------------------------------------------------------
1 -> 2 -2835 (to 4965) -2908 (to 5092)
2 -> 3 -2397 (to 5403) -2459 (to 5541)
3 -> 4 -1878 (to 5922) -1926 (to 6074)
4 -> 5 -1825 (to 5975) -1872 (to 6128)

Looks like 10" wheels might be acceptable after all! :) I had to cut out the MPH / RPM in each gear cause the formatting was all whacked. :(

Andy,

You couldn't do that for 165/60/12 could you please!

Cos I'm definately running 12's as I've already got 'em

Gaz

[duck]

mrminiuk - the calculator is freeware, if you want a copy I will e-mail it to you. (it is only 516kb zipped up)

[Latka]

Here ya go:



GearCalc v2.0.0.1 Copyright ©2001, Peter Ogden
Gear Ratio, Speed and RPM Calculator

Gear set: Manually entered values
Gear 1 2 3 4 5 Final
Ratios: 3.307 2.105 1.458 1.107 0.848 4.200

RPM Limit: 8000
RPM @Peak Power: 7800
Tyre Size: 165/60 x 12
Tyre Diameter: 19.80 in
Tyre Circumference: 62.20 in


Gear Mph per 1000 RPM Mph @7800 RPM Mph @8000 RPM
--------------------------------------------------------
1 4.24 33 34
2 6.66 52 53
3 9.62 75 77
4 12.67 99 101
5 16.54 129 132



Gear Change RPM drop (change @7800) RPM drop (change @8000)
-------------------------------------------------------------
1 -> 2 -2835 (to 4965) -2908 (to 5092)
2 -> 3 -2397 (to 5403) -2459 (to 5541)
3 -> 4 -1878 (to 5922) -1926 (to 6074)
4 -> 5 -1825 (to 5975) -1872 (to 6128)