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Old 01-13-2002, 03:55 AM   #1
okamikatekore
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1999 forester GT
2.0 Turbo, green

Default 4.111 final drive ratio change to 4.4????

i have a 99 forester gt (turbo)with 215/60-16 tires.if i put a lower profile tire(215/55-16) on,this will change my final drive ratio from 4.111 to 4.250.if i put a 50 series tire the ratio will go from 4.111 to 4.4.the 99 spec wrx had a ratio of 3.9,while the 99 spec sti had a 4.444 ratio.what effect will a taller ratio have?eg)will it rev harder at the same speed compared to the original etc.......
reasons for lower profile include:
ultra high performance tires are available in 55 series and lower
performance
aesthetics

oh yeah.....im aware of the issues involved with speedo accuracy(easy fix)
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Old 01-13-2002, 11:01 AM   #2
Si2WRX
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on Dyno Dynamics

Default

It'd be interesting to see if the car pulls harder set up like that.

But the thing I would be most concerned about myself...your mileage will tick by faster than actual.

--------------
Erik
'02 WRX semi-stock ~240hp
'94 Grand Cherokee 5.2 QuadraTrac modified ~275hp
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Old 01-13-2002, 11:56 AM   #3
d00f
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Changing the gear ratio like this will trade top speed for acceleration. By all accounts an RS upgraded from 4.11 to 4.44 accelerated significantly faster.

Why do I have the strange feeling I already answere this question in the transmission forum where it ought to have been anyway.

-Michael
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Old 01-13-2002, 12:30 PM   #4
Austin
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With smaller tires you'll be at a higher rpm than before at the same speed in the same gear.
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Old 01-14-2002, 02:51 AM   #5
okamikatekore
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Default oops......

doof.......sorry about that but i wasnt getting many views in the transmission forum.

si2WRX........if i do go ahead with this, MRT sell 'thingy' that you can recalibrate your speedo for larger/smaller wheels

this could be worth a try.only thing is ill have to getthose 18" superleggras now.otherwise my car will look like an impala with rollerskate wheels
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Old 01-14-2002, 02:37 PM   #6
annointed
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Default Re: 4.111 final drive ratio change to 4.4????

Quote:
Originally posted by okamikatekore
i have a 99 forester gt (turbo)with 215/60-16 tires.if i put a lower profile tire(215/55-16) on,this will change my final drive ratio from 4.111 to 4.250.if i put a 50 series tire the ratio will go from 4.111 to 4.4.the 99 spec wrx had a ratio of 3.9,while the 99 spec sti had a 4.444 ratio.what effect will a taller ratio have?eg)will it rev harder at the same speed compared to the original etc.......
reasons for lower profile include:
ultra high performance tires are available in 55 series and lower
performance
aesthetics

oh yeah.....im aware of the issues involved with speedo accuracy(easy fix)

How do you calculate final drive ratio and corresponding changes made by adjusting tire profile? I'd really like to know this...and since my speedo was 5 mph fast from the factory, speedo accuracy doesn't matter to me. Right now with my 17" UK rims w/45 profile, my speedo is only 2.5 mph fast...
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Old 01-15-2002, 06:55 AM   #7
okamikatekore
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annointed.......this is the easy wayhttp://www.tolan-hoechst.com/cars/tirecalc.htm quick and easy
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Old 01-15-2002, 09:49 AM   #8
Conduit
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Do you have a link to the MRT 'thingy' that recalibrates speedos? That would be alot better than paying a speedo shop (maybe!).
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Old 01-15-2002, 07:48 PM   #9
Austin
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Conduit - do *you* have a link to the mrt thingy? Any more info on it?
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Old 01-20-2002, 01:46 AM   #10
okamikatekore
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1999 forester GT
2.0 Turbo, green

Default here we go..........

here is the info on the speedo recalibrator:


ADJUSTABLE SPEED LIMITER and speedo signal calibrator.
Designed to be fully "programmable" the electronic part simply converts the speedo drive digital signal to a setting that is "user definable".

Able to redefine the speed cut to a user chosen limit
Able to re calibrate the signal to suit larger or smaller dia wheels. (Great for new big dia wheels!)
The part is available with a program disc (DOS based) to allow owners to set two functions:

Speed limit
Speed ratio.

you will have to email MRT for prices
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Old 01-20-2002, 01:53 AM   #11
okamikatekore
Scooby Newbie
 
Member#: 12536
Join Date: Nov 2001
Location: AUSTRALIA
Vehicle:
1999 forester GT
2.0 Turbo, green

Default here we go..........

here is the info on the speedo recalibrator:


ADJUSTABLE SPEED LIMITER and speedo signal calibrator.
Designed to be fully "programmable" the electronic part simply converts the speedo drive digital signal to a setting that is "user definable".

Able to redefine the speed cut to a user chosen limit
Able to re calibrate the signal to suit larger or smaller dia wheels. (Great for new big dia wheels!)
The part is available with a program disc (DOS based) to allow owners to set two functions:

Speed limit
Speed ratio.

you will have to email MRT for prices
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Old 01-20-2002, 02:00 AM   #12
Austin
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Thanks! I'll email them tomorrow.
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