Speed in gears

I ended up doing these calculations myself, because I couldn't find it on the net. I think I got them right, but if anyone sees any glaring errors, let me know. Its a little hard to read, but the info is in there. THIS CHART WAS CALCULATED USING A 3.9 FINAL DRIVE FOR ALL TRANSMISSIONS LISTED.

This was calculated using a tire size of 225-45-17, with a diameter of exactly 25 inches.

UPDATE: Some of the 3000rpm and 3500rpm figures seem to be wrong, I've removed them and will redo them.

http://www.powerdog.com/tiresize.cgi
http://www.offroaders.com/info/tech...ing/mph-rpm.htm

Gear Ratio, Speed at 7000 Rpm

USDM 5
1 3.454 38.66
2 1.947 68.59
3 1.366 97.77
4 0.972 137.39
5 0.738 180.95


JDM RA 5
1 3.083 43.32
2 2.062 64.77
3 1.545 86.44
4 1.151 116.03
5 0.825 161.88


USDM 6
1 3.636 36.73
2 2.375 56.23
3 1.761 75.84
4 1.346 99.21
5 0.971 137.54
6 0.756 176.65


JDM 6
1 3.636 36.73
2 2.375 56.23
3 1.761 75.84
4 1.346 99.21
5 1.062 125.75
6 0.842 158.60


Gimmie Gears Sport/Street Set
1 3.00 44.52
2 2.00 66.77
3 1.48 90.23
4 1.17 114.14
5 0.76 175.72


Gimmie Gears Sport Set
1 3.00 44.52
2 2.00 66.77
3 1.48 90.23
4 1.17 114.14
5 .963 138.68


Kaaz close ratio gearset
1 3.167 42.17
2 2.267 58.91
3 1.667 80.11
4 1.250 106.84
5 0.964 138.53

 

interesting, i thought the jdm 6spd and the usdm 6spd were the same. do you konw if the usdm 6spd will bolt directly with the gd8 wrx's drive shaft? and how difficult do you think it would be?

 

Here's a relevant thread.

http://forums.nasioc.com/forums/show...ion+conversion

One thing is for sure, I'm going to put a USDM 6mt into my 2003 WRX. After looking at the gear comparos, every time I drive my car now, I'm reminded what a lump of **** the standard box is. Weak, notchy, doesn't like going into first, AND huge gaps between ratios. All this and my car only has 3501 miles on it. Get busy livin' or get busy dyin', I guess.
-Mirror

 

I'm in the process of getting a JDM RA 5 speed gearset into the rallycar. I'll post here with impressions when it's in.

 

Excellent. I'm most interested to see how it compares to the figures. What will your tire size be?

 

Ping!

 

Whoops, I was supposed to reply to this, wasn't I?

I'm using the stock 3.9 diffs at this point.

The RA gears are very, very nice. First gear is taller, becoming much more usable in racing situations, and the even spacing between gears means that acceleration is smooth all the way up through the gearbox.