MK1 3.722 vrs TRD 4.733 Final Drives

Stock 3.722 vrs TRD 4.733 vrs 4.1 Final Drives

The left column is for guys running a common Drag slick size tyre, the right one is for guys running a typical street/semi slick style tyre. Surprising just how much the tyre effects the final outcome of each gear! Rated for for 7000rpm and 7500rpm, also for comparison of guys thinking of raised their limiter slightly. All these are baised on the Mk1 GT gearbox ratios.

3.722 Final Drive

225/50/15............195/50/15

5th.....................5th
7000 163.79.........7000 155.68
7500 175.49.........7500 166.80

4th.....................4th
7000 137.76.........7000 130.94
7500 147.60.........7500 140.29

3rd......................3rd
7000 101.90..........7000 96.86
7500 109.18..........7500 103.77

2nd.....................2nd
7000 70.11...........7000 66.64
7500 75.12...........7500 71.40

1st......................1st
7000 42.16...........7000 40.08
7500 45.18...........7500 42.94

--------------------------
TRD 4.733 Final Drive

225/50/15............195/50/15

5th.....................5th
7000 128.80.........7000 122.43
7500 138.00.........7500 131.17

4th.....................4th
7000 102.97.........7000 108.33
7500 110.33.........7500 116.07

3rd......................3rd
7000 80.13...........7000 76.17
7500 85.86...........7500 81.61

2nd.....................2nd
7000 55.13...........7000 52.40
7500 59.07...........7500 56.15

1st.....................1st
7000 33.16...........7000 31.52
7500 35.53...........7500 33.77

----------------------------
4.1 Final Drive

225/50/15............195/50/15

5th.....................5th
7000 148.69.........7000 141.33
7500 159.31.........7500 151.42

4th.....................4th
7000 125.06.........7000 118.87
7500 133.99.........7500 127.36

3rd......................3rd
7000 92.51..........7000 87.93
7500 99.11..........7500 94.21

2nd.....................2nd
7000 63.65...........7000 60.50
7500 68.19...........7500 64.82

1st......................1st
7000 38.28...........7000 36.38
7500 41.01...........7500 38.98

My head hurts! I'll update it later with the 4.3 final drive, fighting a stinking hang over today!

good info lad, can you do 4.3 aswell?

Yea I'll do it shortly, looking to know the 4.3 values myself.

http://www.trdparts.jp/english/list_race-mis_ep.html

Thats got some graphs if you havent seen it already mate

TO82 said:

http://www.trdparts.jp/english/list_race-mis_ep.html

Thats got some graphs if you havent seen it already mate

Click to expand...

Ohh very nice! Never seen em before.

Awesome info. The TRD final drive still available to buy? Would be perfect for a 200hp ep, only thing is you can not hit 60 in second gear + fuel consumption would go out the window on a highway journey. Would be awesome in a tight handling circuit or point to point sprint. Looking forward to see the 4.1 final drive!

GP82 said:

Awesome info. The TRD final drive still available to buy? Would be perfect for a 200hp ep, only thing is you can not hit 60 in second gear + fuel consumption would go out the window on a highway journey. Would be awesome in a tight handling circuit or point to point sprint. Looking forward to see the 4.1 final drive!

Click to expand...

Yea you can still get the TRD final drive. I've put up the 4.1 info.

hey, i know its an old thread but did you get around to the 4.3 figures?

am also wondering how these different ratios will affect boost

Thanks

Erm I'm not sure if I did, I'll have to check the other laptop and see if I have them on there. I fitted the 4.1, it was a bad choice for my power but on something 250hp or less it would work a treat, can really feel her accelerate better.

spuddy said:

Erm I'm not sure if I did, I'll have to check the other laptop and see if I have them on there. I fitted the 4.1, it was a bad choice for my power but on something 250hp or less it would work a treat, can really feel her accelerate better.

Click to expand...

ok, was looking into the 4.3...do you think it'll be good for a 220-230 bhp GT? why you said the 4.1 it was a bad choice for you? (i might need a crash course in understanding gear ratios)

after comparing the C52 with the C56 (Glanza V) seems that because of the longer 3rd and 4th the gbox had a final of 4.3

so..am i right in saying that installing a 4.3 final drive on a C52 will be a good upgrade? still not sure how it'll affect boost thou

The 4.7 will basically stop your car at 90mph. The 4.3 with 145whp stopped the car at 120mph at maximum rpm. So a 200hp car with a 4.3 final drive will be crazy. From my experience the final drive doesn't affect the general speed in each gear. You can still hit 60mph in second. What it does affect is how fast it will take to get through that gear and top speed. However as you increase hp and torque, since the gearbox is a torque multiplier those factors will change significantly.

hardcoreep said:

The 4.7 will basically stop your car at 90mph. The 4.3 with 145whp stopped the car at 120mph at maximum rpm. So a 200hp car with a 4.3 final drive will be crazy. From my experience the final drive doesn't affect the general speed in each gear. You can still hit 60mph in second. What it does affect is how fast it will take to get through that gear and top speed. However as you increase hp and torque, since the gearbox is a torque multiplier those factors will change significantly.

Click to expand...

i take it you mean it'll be crazy in a good way? lol

i dont mind losing top speed since ive never hit 180 km/h

Well I mean crazy in bad way. You'd get nothing but wheelspin and you'd redline every gear.

hardcoreep said:

Well I mean crazy in bad way. You'd get nothing but wheelspin and you'd redline every gear.

Click to expand...

damn..and i was really starting to get interested lol

so i guess its best to leave it as it is then?

why is the tyre width making a difference in the top speed? surely the circumference should make the difference, but seen as both tyres are 50/15, i dont get why there is a big difference in speed.

tyre pressure?

or am i missing something simple?

scot-ish said:

why is the tyre width making a difference in the top speed? surely the circumference should make the difference, but seen as both tyres are 50/15, i dont get why there is a big difference in speed.

tyre pressure?

or am i missing something simple?

Click to expand...

50 in a tyre means 50% of the width in height so the wider it is with a 50 will make it taller.

A 4.1 on a 250hp or less motor would be good.

rolling diameter = ((tyre width in mm x tyre profile)/25.4 to convert to inches)x2 + rim size
195mm x .5 = 97.5mm/25.4 = 3.8inches x 2 = 7.6inches + 15inches = 22.6
205mm x .4 = 82mm/25.4 = 3.2inches x 2 = 6.4inches + 16 = 22.4


As you can see here, this is why I don't use 45 series 16-inch tyres on the Starlet. Besides more tyre scrub you'll lengthen the gearing.

spuddy said:

50 in a tyre means 50% of the width in height so the wider it is with a 50 will make it taller.

A 4.1 on a 250hp or less motor would be good.

Click to expand...

seems like i should sort out a C56 then lol

How can I know if my gt has the TRD Close Ratio Transmission? I´m wondering because at 100kmh (60mph) the engine is running at 3300rpms +/- in 5th gear. In 4th gear at 6000rpm i'm going like at 140kmh (88mph)

Is that normal????? BTW my gt also has lsd.