FINAL GEAR KIT

[dboey]

Hi anyone have a 4.7 or 5.1 final gear kit on the IS. Any comments?

[te37 altezza]

I have a 4.778 final gear kit but and will be install soon ! tell u later ^^

[dboey]

Is your final gear from TRD or Boris Factory? Kindly comment after your installation.

[te37 altezza]

My final gear set is from Toyota..

i think if you get the final gear you better get the 4.778 because i think 5.125 will lose too much power at the end!!

[TRD328]

correct.

4.7 is good for manual

5.1 good for auto

also note speed limit on roads.

I lay with 0-100km/h more than 1/4 mile thus i chose 5.1

[dboey]

hi TRD328, did you lose out in your high end with your 5.1 final gear kit.

[John Lee]

hi people,

could someone tell me what's this final gear kit about? is it the whole gears system??

thanks in advance:)

[lexicon]

hi people,

could someone tell me what's this final gear kit about? is it the whole gears system??

thanks in advance:)

Hi John,

the final gear kit basically refers to the ratio of the diff. By changing this, you can alter the spread of all the gears (5sp AT or 6sp MT) to give higher top-end (at the cost of acceleration) or vice -versa.

So the guys with Turbo/Superchargers might want to increase the final drive to increase top speed and make the lower gears a bit more useful :smilegrin:

[TRD328]

hi TRD328, did you lose out in your high end with your 5.1 final gear kit.

Yes I did lose out a bit. But the trust airfilter helped me gain back the loss.

[dboey]

HI TRD328, what is the max speed with 5.1 final gear kit?

[TRD328]

no idea .. but expect the top speed to be down a bit...

The fastest i've driven my car was 180km/h but that was before turbo..

[dboey]

Hi TRD328,

I have a confirmation from TRD Japan, Mr Watanabe that there is no final gear for our car and the funny thing is you guys can get the final gear from HK.

[brn7y]

Hi TRD,

Just a boring bit of info for you but your engine designation is now 1G-FTE.

:D:D

[TRD328]

well you can tell Mr watanabe to check again...

So is there a 1g-Fte engine?

if so then there must be pistons for our car...

[te37 altezza]

The SXE10 final gear is same as GXE-10 final gear!! u you can get the altezza final gear! and the final gear is made by toyota not trd..

[te37 altezza]

hello!! i finally install my 4.778 final gear in my 6MT IS200 and i can really feel 1 -4 gear are very good and improve a lot but i find that my top speed only got about 170km - 180 km and is 6000rpm already so cannot go further! anyone have idea how to improve the top speed back about 200km?

[dboey]

Hi te37 altezza,

You can't have both low end & high end torque together with the final gear. Your top speed of 170-180km is very poor as TRD 328 had better top speed with 5.1 final gear. As your final gear kit is 4.7, I though that you will be getting better top speed that 5.1 final gear kit.

[TRD328]

His speedo reading is a bit wrong.. but I'll guess his top speed might be 190km/h.

The 5.1 should have a lower top speed than 4.7 gearing.

other factors coming into play is the speed limiter fitted onto our cars.

I haven't done any top speed testing after the turbo.. don't wanna push the enigne too hard...

[Monster-Mat]

you have speed limiters fitted!!!!!

[TRD328]

speed limiter remoooooooooved :D

[te37 altezza]

what u mean speed limiter? I have try my top speed more then 200km can still going!! but now the problem is after the 4.778 final gear my top is around 170-180km i guss ( in my dash board is show 200km ) the RPM is around 6000rpm already we cannot go after 6200rpm right? can remove???