Gearbox Ratios.

Larry,
Again I don't know anything about part compatibility, so you will need to talk to a good trany builder first, but here are some options. All speeds are at 7000 on a 23 inch wheel.

option 1
A US gvr4 trans with an evo/rs secondary (this will require a $500 rear ring and pinion or some luck and generosity on cheeky's behalf)

1st 30.99
2nd 52.37
3rd 79.09
4th 105.86
5th 132.41
not that much gain but it will definitely work.

option 2
A US gvr4 trany with a ggsx primary. I have no idea if these parts are compatible but they are parts available in the US.

1st 25.91
2nd 43.79
3rd 66.14
4th 88.53
5th 110.73
probably much closer to what you are looking for

option 3
A US gvr4 trany with a ggsx primary and an evo/rs secondary. This is probably the least economical way of doing it, if it would even work.

1st 23.52
2nd 39.74
3rd 60.02
4th 80.34
5th 100.49

option 4
A evo/rs trany with a ggsx primary.

1st 26.03
2nd 41.83
3rd 57.69
4th 77.64
5th 108.47


Again all of this is just a numbers game. I know nothing about part compatibility. If the gears themselves can be swapped (like 5th for example) there would be quite a few more options.

 

[teet]

You can use the GGSX secondary...but not the primary.

the primary is on the center diff. The center diff in the GGSX is VERY different from the center diff in the VR4. Not compatible at all.

john

 

Thanks for clearing that up John. I wish I had more knowledge.

Any chance a ggsx trany could handle the abuse of a turbo motor?
With the exception of fifth, a ggsx trany has the same ratios as gvr4.

 

[teet]

I don't think so. The bearings are ball bearings in the NT and the turbo are tapered roller bearings.

the gear stacks may be the same ratio...but I think the gears are thinner....not 100% sure on that.

I didn't realize about the center diffs either till I took one apart

 

[sleepyvr4]

here's the vfaq comparison including TEL transmissions...

http://vfaq.com/mods/Trannies.html

 

[Hertz]

Quote:
Quote:
This excel sheet may save you some typing in the future and may also be fun to play with.
excel sheet



I'm not sure if any of you saw this or maybe there are too many numbers on it. Either way there is a lot of info on it. It is similar to Hertz's but has side by side comparissons of many different combos.



Ah very cool! Only major difference I see is the tire diameter. That sheet has 23", whereas I have 24.5". Which one is correct?

 

[powerplay]

The information I have for the stock wheels/tires is 24.21"

 

[teet]

Hertz
You also are dividing by the transfercase ratio in your spreadsheet to calculate speed...that's not quite right...

15 inches + 195mm * 60% = about 22.5 inches

thats how I calculated it...

John

 

[iceman69510]

Quote:
The information I have for the stock wheels/tires is 24.21"



That is the correct number. Agrees with my tire calculator.

Tire size calculation
EXAMPLE
ENTIRE TIRE TREAD WIDTH 195, 205, 245, etc. 195
ENTER TIRE PROFILE 50, 60, 65 etc. 60
ENTER WHEEL DIAMETER 14, 15, 17 etc. 15

TIRE DIAMETER (inches) 24.2

 

[iceman69510]

Quote:
1
15 inches + 195mm * 60% = about 22.5 inches

thats how I calculated it...

John


Whoops. Two outsides to that circle.

15 inches + [(195mm * 60%)x2]/25.4 mm/inch = 24.2 "

 

[teet]

humm...I have that in my spreadsheet...but didn't type it...and huh...it does come out with 24.21

huh. stupid numbers /ubbthreads/images/graemlins/wink.gif you'd think one of these days i'd get them right /ubbthreads/images/graemlins/wink.gif

john

 

I updated my spread sheet with proper tire information, including a size converter. It's still at the same link.

Initially I had 23 inches because a took a tape measure to my wheel and rounded up to compensate for the tire being out of round due to weight. Obviously I didn't round high enough.

 

[Hertz]

Paul, I've changed my link to point to your spreadsheet. It's much nicer. /ubbthreads/images/graemlins/smile.gif Thx.