Gearboxes/Diffs and Speed In Gear

[Alex]

Well I was a bit bored so using the Quaife Gearbox calc tool I've put together a list of all the main combo's of gearboxes and the speeds attainable by them. Mainly of interest to me was the major differences between the V160 and V161 manual gearboxes...the latter being much better gear (yay) for dragging with uprated power, as you're not in danger of having to switch up to 5th unless you're running silly power...but check out the Auto with the UK Manual Diff - lol how fast!

Gearbox:- 2JZ-GTE VVTI V161 6-Spd
Tyre:- Michelin all patterns 235/45 x 17
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Top Gear gives 27.348 MPH/1000 RPM and a top speed of 191.438 MPH at 7000 RPM

Engine speeds in top gear:-
30 MPH = 1097 RPM 40 MPH = 1463 RPM 50 MPH = 1828 RPM 60 MPH = 2194 RPM
70 MPH = 2560 RPM 80 MPH = 2925 RPM 90 MPH = 3291 RPM 100 MPH = 3657 RPM

Top Speed in 1 gear = 42.050 MPH
And changes into 2 gear at 4222 RPM dropping 2778 RPM
Top Speed in 2 gear = 69.722 MPH
And changes into 3 gear at 4803 RPM dropping 2197 RPM
Top Speed in 3 gear = 101.620 MPH
And changes into 4 gear at 5474 RPM dropping 1526 RPM
Top Speed in 4 gear = 129.955 MPH
And changes into 5 gear at 5809 RPM dropping 1191 RPM
Top Speed in 5 gear = 156.596 MPH
And changes into 6 gear at 5726 RPM dropping 1274 RPM
Top Speed in 6 gear = 191.438 MPH
******************************************************************************************
Gearbox:- 2JZ-GTE V160 6-Spd
Tyre:- Michelin all patterns 235/45 x 17
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Top Gear gives 28.210 MPH/1000 RPM and a top speed of 197.473 MPH at 7000 RPM

Engine speeds in top gear:-
30 MPH = 1063 RPM 40 MPH = 1418 RPM 50 MPH = 1772 RPM 60 MPH = 2127 RPM
70 MPH = 2481 RPM 80 MPH = 2836 RPM 90 MPH = 3190 RPM 100 MPH = 3545 RPM

Top Speed in 1 gear = 40.919 MPH
And changes into 2 gear at 4317 RPM dropping 2683 RPM
Top Speed in 2 gear = 66.354 MPH
And changes into 3 gear at 4998 RPM dropping 2002 RPM
Top Speed in 3 gear = 92.935 MPH
And changes into 4 gear at 5450 RPM dropping 1550 RPM
Top Speed in 4 gear = 119.357 MPH
And changes into 5 gear at 5335 RPM dropping 1665 RPM
Top Speed in 5 gear = 156.596 MPH
And changes into 6 gear at 5551 RPM dropping 1449 RPM
Top Speed in 6 gear = 197.473 MPH
******************************************************************************************
Gearbox:- 2JZ-GE (NA) W58 5-Spd
Tyre:- Michelin all patterns 235/45 x 17
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Top Gear gives 22.854 MPH/1000 RPM and a top speed of 159.976 MPH at 7000 RPM

Engine speeds in top gear:-
30 MPH = 1313 RPM 40 MPH = 1750 RPM 50 MPH = 2188 RPM 60 MPH = 2625 RPM
70 MPH = 3063 RPM 80 MPH = 3501 RPM 90 MPH = 3938 RPM 100 MPH = 4376 RPM

Top Speed in 1 gear = 38.131 MPH
And changes into 2 gear at 4036 RPM dropping 2964 RPM
Top Speed in 2 gear = 66.136 MPH
And changes into 3 gear at 4712 RPM dropping 2288 RPM
Top Speed in 3 gear = 98.244 MPH
And changes into 4 gear at 5490 RPM dropping 1510 RPM
Top Speed in 4 gear = 125.261 MPH
And changes into 5 gear at 5481 RPM dropping 1519 RPM
Top Speed in 5 gear = 159.976 MPH
******************************************************************************************
Gearbox:- 2JZ-GTE AUTO 4-spd
Tyre:- Michelin all patterns 235/45 x 17
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Top Gear gives 27.497 MPH/1000 RPM and a top speed of 192.478 MPH at 7000 RPM

Engine speeds in top gear:-
30 MPH = 1091 RPM 40 MPH = 1455 RPM 50 MPH = 1818 RPM 60 MPH = 2182 RPM
70 MPH = 2546 RPM 80 MPH = 2909 RPM 90 MPH = 3273 RPM 100 MPH = 3637 RPM

Top Speed in 1 gear = 48.394 MPH
And changes into 2 gear at 3822 RPM dropping 3178 RPM
Top Speed in 2 gear = 88.633 MPH
And changes into 3 gear at 4572 RPM dropping 2428 RPM
Top Speed in 3 gear = 135.697 MPH
And changes into 4 gear at 4935 RPM dropping 2065 RPM
Top Speed in 4 gear = 192.478 MPH
******************************************************************************************
Gearbox:- 2JZ-GE (NA) AUTO 4-Spd
Tyre:- Michelin all patterns 235/45 x 17
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Top Gear gives 25.382 MPH/1000 RPM and a top speed of 177.676 MPH at 7000 RPM

Engine speeds in top gear:-
30 MPH = 1182 RPM 40 MPH = 1576 RPM 50 MPH = 1970 RPM 60 MPH = 2364 RPM
70 MPH = 2758 RPM 80 MPH = 3152 RPM 90 MPH = 3546 RPM 100 MPH = 3940 RPM

Top Speed in 1 gear = 44.672 MPH
And changes into 2 gear at 3822 RPM dropping 3178 RPM
Top Speed in 2 gear = 81.817 MPH
And changes into 3 gear at 4572 RPM dropping 2428 RPM
Top Speed in 3 gear = 125.261 MPH
And changes into 4 gear at 4935 RPM dropping 2065 RPM
Top Speed in 4 gear = 177.676 MPH
******************************************************************************************
Gearbox:- 2JZ-GTE VVTI V161 6-Spd w/UK DIFF
Tyre:- Michelin all patterns 235/45 x 17
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Top Gear gives 28.509 MPH/1000 RPM and a top speed of 199.564 MPH at 7000 RPM

Engine speeds in top gear:-
30 MPH = 1052 RPM 40 MPH = 1403 RPM 50 MPH = 1754 RPM 60 MPH = 2105 RPM
70 MPH = 2455 RPM 80 MPH = 2806 RPM 90 MPH = 3157 RPM 100 MPH = 3508 RPM

Top Speed in 1 gear = 43.836 MPH
And changes into 2 gear at 4222 RPM dropping 2778 RPM
Top Speed in 2 gear = 72.682 MPH
And changes into 3 gear at 4803 RPM dropping 2197 RPM
Top Speed in 3 gear = 105.934 MPH
And changes into 4 gear at 5474 RPM dropping 1526 RPM
Top Speed in 4 gear = 135.472 MPH
And changes into 5 gear at 5809 RPM dropping 1191 RPM
Top Speed in 5 gear = 163.244 MPH
And changes into 6 gear at 5726 RPM dropping 1274 RPM
Top Speed in 6 gear = 199.564 MPH
******************************************************************************************
Gearbox:- 2JZ-GTE V160 6-Spd w/UK DIFF
Tyre:- Michelin all patterns 235/45 x 17
-------------------------------------------------------------------------------------------
Top Gear gives 29.408 MPH/1000 RPM and a top speed of 205.856 MPH at 7000 RPM

Engine speeds in top gear:-
30 MPH = 1020 RPM 40 MPH = 1360 RPM 50 MPH = 1700 RPM 60 MPH = 2040 RPM
70 MPH = 2380 RPM 80 MPH = 2720 RPM 90 MPH = 3060 RPM 100 MPH = 3400 RPM

Top Speed in 1 gear = 42.656 MPH
And changes into 2 gear at 4317 RPM dropping 2683 RPM
Top Speed in 2 gear = 69.171 MPH
And changes into 3 gear at 4998 RPM dropping 2002 RPM
Top Speed in 3 gear = 96.880 MPH
And changes into 4 gear at 5450 RPM dropping 1550 RPM
Top Speed in 4 gear = 124.424 MPH
And changes into 5 gear at 5335 RPM dropping 1665 RPM
Top Speed in 5 gear = 163.244 MPH
And changes into 6 gear at 5551 RPM dropping 1449 RPM
Top Speed in 6 gear = 205.856 MPH
******************************************************************************************
Gearbox:- 2JZ-GTE AUTO 4-spd w/UK MANUAL DIFF
Tyre:- Michelin all patterns 235/45 x 17
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Top Gear gives 33.079 MPH/1000 RPM and a top speed of 231.551 MPH at 7000 RPM

Engine speeds in top gear:-
30 MPH = 907 RPM 40 MPH = 1209 RPM 50 MPH = 1512 RPM 60 MPH = 1814 RPM
70 MPH = 2116 RPM 80 MPH = 2418 RPM 90 MPH = 2721 RPM 100 MPH = 3023 RPM

Top Speed in 1 gear = 58.218 MPH
And changes into 2 gear at 3822 RPM dropping 3178 RPM
Top Speed in 2 gear = 106.625 MPH
And changes into 3 gear at 4572 RPM dropping 2428 RPM
Top Speed in 3 gear = 163.244 MPH
And changes into 4 gear at 4935 RPM dropping 2065 RPM
Top Speed in 4 gear = 231.551 MPH
******************************************************************************************
Gearbox:- 2JZ-GTE AUTO 4-spd w/JAP MANUAL DIFF
Tyre:- Michelin all patterns 235/45 x 17
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Top Gear gives 31.732 MPH/1000 RPM and a top speed of 222.122 MPH at 7000 RPM

Engine speeds in top gear:-
30 MPH = 945 RPM 40 MPH = 1261 RPM 50 MPH = 1576 RPM 60 MPH = 1891 RPM
70 MPH = 2206 RPM 80 MPH = 2521 RPM 90 MPH = 2836 RPM 100 MPH = 3151 RPM

Top Speed in 1 gear = 55.847 MPH
And changes into 2 gear at 3822 RPM dropping 3178 RPM
Top Speed in 2 gear = 102.283 MPH
And changes into 3 gear at 4572 RPM dropping 2428 RPM
Top Speed in 3 gear = 156.596 MPH
And changes into 4 gear at 4935 RPM dropping 2065 RPM
Top Speed in 4 gear = 222.122 MPH
******************************************************************************************

[Matt Harwood]

That's actually really interesting :thumbs:

I want/need a UK manual diff! :innocent:

[migster]

Am i Reading that right or does that read as an Auto with Uk diff is faster top end that a manual with the same diff?:blink: I also want a UK manual Diff:looney:

[MONKEYmark]

nice post. what would a jap auto with a uk auto lsd work out to?

wasnt there 2 types of auto?
i thought there was only the a340
if i remember the uk spare box i have is called a a341 or something. i got told buy the guy who fitted mine that a speed sensor has 17 or 18 notches and was slightly different.
will have a look at gearbox model number when i go look at spare uk box. who you work out the speed ratings of diffs and boxes.

thanks

[Alex]

Mark, The auto was only listed where I was looking for info with 1 spec of diff, if you can find info to correct that I'll add it in :)

I just need the Diff Ratio if it's different on the UK Auto.

Glad you liked my moment of boredom lol

[Matt Harwood]

Easy to find out.
If someone with a UK auto and a GPS unit would be kind enough to find themselves a motorway and turn OFF overdrive, then sit at 3000rpm, and monitor the speed with a good GPS unit. (take the speed reading about 10 seconds after a constant 3000 rpm at allow the GPS to keep up)

My old JDM auto was 56/57 mph @ 3krpm.

Yes Mig, I believe you are reading that correctly. But even the JDM manual diff gives a more than respectable top speed coupled to an auto box! :eek:

[Lucifer]

Resurection time!

Great post, well done!

[veilsideTT]

Im putting a 6spd manual diff on my auto in the next few months.
Looking forward to seeing what its like!

After the summer ill put the rest of the parts on for my 6sp conversion but i gotta try this with high stall first.

[Lucifer]

PLease let me know how it goes as I iwll be runing the same setup.

[veilsideTT]

Will do mate,

Worried about my speedo being a mile out though.
Different diff and running 19's will screw it up completely

Not sure if the reading will read faster than actual speed or read slower than actual speed. :confused:

When do you plan to do yours?
What stall will you run?
What size turbo are you using?

[Lucifer]

May ish

3800-4000

HKS Twins

Not worried about speedo

[Jake]

Gearbox:- 2JZ-GTE VVTI V161 6-Spd
Tyre:- Michelin all patterns 235/45 x 17

Gearbox:- 2JZ-GTE V160 6-Spd
Tyre:- Michelin all patterns 235/45 x 17


Gearbox:- 2JZ-GTE AUTO 4-spd
Tyre:- Michelin all patterns 235/45 x 17
Why 235/45/17 ? Isn't the stock rear tyre size 255/40/17 ?

255/40/17 = 1997.42mm circumference
235/45/17 = 2020.98mm circumference

[veilsideTT]

what are your goals from this?

[Whitesupraboy2]

Why 235/45/17 ? Isn't the stock rear tyre size 255/40/17 ?

255/40/17 = 1997.42mm circumference
235/45/17 = 2020.98mm circumference

True but where does the Speedo get the signal from is it the front wheels or rear on the supra.

I dont actually know this so kinda question for someone to answer?

[Lucifer]

Gearbox I thought.

[Jake]

Yes, from the gearbox. So the figure is altered by using different RR rear tyres.

[Lucifer]

Hell Yeah...... But if you were REEEEEEAAAly clever.... you could regear the Speedo drive to suit your application.

[veilsideTT]

I imagine the different ratio of the diff will affect the actuall speed also.

[Terminator]

Looks like the 200mph Lucifer project could be very interesting.

Is there any way to work out theoretical acceleration rates by using various gear box diff combos. Top speed is one thing but getting to road useable speeds quicker than everyone else is more fun.

[Lucifer]

Looks like the 200mph Lucifer project could be very interesting.

Is there any way to work out theoretical acceleration rates by using various gear box diff combos. Top speed is one thing but getting to road useable speeds quicker than everyone else is more fun.


Well said... I can do with all teh help I can get!

[Alex]

Looks like the 200mph Lucifer project could be very interesting.

Is there any way to work out theoretical acceleration rates by using various gear box diff combos. Top speed is one thing but getting to road useable speeds quicker than everyone else is more fun.


Probably not....well not without a very complicated calculation taking into affect the air resistance/drag and the problems of tyre slip etc.

I think only real world tests can show which combo is faster.

[Lucifer]

Aiming for 550-600 with a histall so hopefully it should pull ok.

[TLicense]

Hell Yeah...... But if you were REEEEEEAAAly clever.... you could regear the Speedo drive to suit your application.

No need. You can buy a yellr box, that will allow you to dial in you real speed (read from a gps or similar) so that your speedo will correct.

[Lucifer]

No need. You can buy a yellr box, that will allow you to dial in you real speed (read from a gps or similar) so that your speedo will correct.


Oooh prey tell where we can find such a device master License

[veilsideTT]

ive read about said "yellow box" on SF

[Jake]

Originally Posted by TLicense No need. You can buy a yellr box, that will allow you to dial in you real speed (read from a gps or similar) so that your speedo will correct.
Oooh prey tell where we can find such a device master License
Amazingly, www.yellr.com :p

[TLicense]

Amazingly, www.yellr.com :p

lol

[veilsideTT]

Are the figures for the auto box based in a 1:1 locked up ratio?

As the convertor is always slipping, weather it be a stock one or a high stall application.

Its like trying to use the manual figures when you have your foot halfway down on the clutch pedal.

Does anyone understand where im coming from with this?

[Alex]

I thought it did lock up at a certain point...
Yes these figures do rely on it being locked up.

[veilsideTT]

cheers for clearing that up for me dude

[SUPRASUZUKI]

I've got one of these on the bike (not sure if it's a yellow box or just similar).
Works well, you just need to set it up correctly with the % error, then compare to an accurate source (GPS via satnav).

Just out of interest I compared the Supra speedo to satnav. The Supra indicated 80mph = 81 on the GPS / satnav.

That's with 285/35 18s on an otherisw stock '96 JDM auto (with LSD, if it makes any difference).