Mx-3 ZE On 4.11:1 Tranny = Slower?

jschrauwen · Post by **jschrauwen** » October 30th, 2006, 11:35 am

This very subject came up at a meet / brunch we had in Toronto yesterday. Now I'm starting to doubt my original perception of final drive ideas.
To make it simple;

At a given speed (lets say 120kph) the rpm's of the MX3's 3.83 final drive is approximately 4000rpm.

Now, at same given speed (120kph), an MX3 fitted with a 626/MX6 tranny with a final drive of 4.11 - are the rpm's going to increase (higher than 4000rpm) or decrease (lower than 4000rpm)?

This is based on an assumption that the 1st through 5th gearing is identical in both tranny's. (they are, aren't they?)

papa roached · Post by **papa roached** » October 30th, 2006, 1:41 pm

the higher the final drive ratio the more RPMs your gonna run and the lower the gearing

tehbrookzorz · Post by **tehbrookzorz** » October 30th, 2006, 2:59 pm

Obviously I've been a little delusional myself.

http://en.wikipedia.org/wiki/Gear_ratio

When I've been thinking of a taller gear ratio, I've always been thinking of the vehicle going faster with the higher number, whereas it appears the acceleration should be faster and the rpm's higher for the same relative speed.

What I want is to bring my revs down in the top gear, making my revs around 2500 rpm at 100 km/h, and also extending my top speed.

max kl · Post by **max kl** » October 30th, 2006, 3:30 pm

jschrauwen wrote:This very subject came up at a meet / brunch we had in Toronto yesterday. Now I'm starting to doubt my original perception of final drive ideas.
To make it simple;

At a given speed (lets say 120kph) the rpm's of the MX3's 3.83 final drive is approximately 4000rpm.

Now, at same given speed (120kph), an MX3 fitted with a 626/MX6 tranny with a final drive of 4.11 - are the rpm's going to increase (higher than 4000rpm) or decrease (lower than 4000rpm)?

This is based on an assumption that the 1st through 5th gearing is identical in both tranny's. (they are, aren't they?)

Your stock diff is a 4.39 final drive, the kl diff is a 4.105 (4.11).

mabe te auto trans is a 3.83 but i have never senn that ratio.

mx3 gs stock 4.39 diff = higher reves at same speed in all gears
kl 4.11 diff = lower revs in all gears at same speed

mx3autozam · Post by **mx3autozam** » October 30th, 2006, 6:06 pm

jschrauwen wrote:This very subject came up at a meet / brunch we had in Toronto yesterday. Now I'm starting to doubt my original perception of final drive ideas.
To make it simple;

At a given speed (lets say 120kph) the rpm's of the MX3's 3.83 final drive is approximately 4000rpm.

Now, at same given speed (120kph), an MX3 fitted with a 626/MX6 tranny with a final drive of 4.11 - are the rpm's going to increase (higher than 4000rpm) or decrease (lower than 4000rpm)?

This is based on an assumption that the 1st through 5th gearing is identical in both tranny's. (they are, aren't they?)

john you are wrong the mx3 drive is 4.39 not 3.83. when we were at taht meet thats why Tom was aying the mx6 would ahve shorter gears and we were all lost. lol we had the wrong numbers man mx3 is 4.39.

mx3autozam · Post by **mx3autozam** » October 30th, 2006, 6:11 pm

yeah the higher the number the more low end torque it has makin it quicker off the line but you run out of gear faster at the end ruducin your top speed. the mx6 tranny will have a higher top speed in our cars over our trannies. which makes them faster but us quicker

http://www.gears-manufacturers.com/gear-ratios.html

Devlin · Post by **Devlin** » October 30th, 2006, 6:33 pm

i'd rather b quick than fast......still have my speed limiter hooked up

lowridah313 · Post by **lowridah313** » October 30th, 2006, 6:50 pm

thank you all who were at the toronto meet, i told you i was right the web site john put up was my research. lol

mx3autozam · Post by **mx3autozam** » October 31st, 2006, 12:31 am

howstuffworks.com has it all and is really good,s ame with wikipedia..

jschrauwen · Post by **jschrauwen** » October 31st, 2006, 9:45 am

mx3autozam wrote:
jschrauwen wrote:This very subject came up at a meet / brunch we had in Toronto yesterday. Now I'm starting to doubt my original perception of final drive ideas.
To make it simple;
At a given speed (lets say 120kph) the rpm's of the MX3's 3.83 final drive is approximately 4000rpm.
Now, at same given speed (120kph), an MX3 fitted with a 626/MX6 tranny with a final drive of 4.11 - are the rpm's going to increase (higher than 4000rpm) or decrease (lower than 4000rpm)?
This is based on an assumption that the 1st through 5th gearing is identical in both tranny's. (they are, aren't they?)
john you are wrong the mx3 drive is 4.39 not 3.83. when we were at taht meet thats why Tom was aying the mx6 would ahve shorter gears and we were all lost. lol we had the wrong numbers man mx3 is 4.39.

Thanks John!! I knew I got it from somewhere.
So, I guess I was wrong and right at the same time.
Wrong about the exact gearing but right about switching to a 626/MX6 tranny and being able to bring the highway speeds rpm level down by about 800 rpm or so. Besides, I don't "live my life a quarter mile at a time" anyway.

Hayata · Post by **Hayata** » November 10th, 2006, 8:36 pm

man i just wanna know which has a higher top speed mx6 or mx3 tranny??? i like bimmin on the highway not draggin...

jschrauwen · Post by **jschrauwen** » November 10th, 2006, 8:50 pm

Hayata wrote:man i just wanna know which has a higher top speed mx6 or mx3 tranny???

MX6/626 = higher top speed (more or less) than the MX3/PGT. Meaning that at 120kph with an MX3 tranny your spinning about ~ 4000rpm. Swap in an MX6/626 tranny and bring those rpms down to about ~ 3200/3300rpm at the same 120kph.

hgallegos915 · Post by **hgallegos915** » November 10th, 2006, 11:56 pm

why do you want to go that fast?? I guess better fuel milleage? most of us already get between 25 - 30 miles per the us gallon..

tehbrookzorz · Post by **tehbrookzorz** » November 11th, 2006, 12:09 am

He said 125 kph. I'm sure he meant km/h, but at any rate, not mph, so it's not actually that fast, but don't try telling that to your local law enforcement officer.

I can't drive, schfifty-five!

lowridah313 · Post by **lowridah313** » November 11th, 2006, 10:21 am

ummm......kph stands for kilometer per hour same as km/h

MX-3.com

Mx-3 ZE On 4.11:1 Tranny = Slower?

top speed

Re: top speed