I don't know if anyone on here has the technical expertise to decypher the effect of the new gearing ratios on the 5 speed GSR / RS transmission.

A taller 2nd gear is especially useful to autocrossing as this means less shifting. I wonder what difference in top speed we'll see in the lower, and all gears for that matter, between the 5 and 6 speed, as well as compared to the prior 5 speed.

A thousand thanks to anyone that can shed some light on this - remember the final drives on both trannies are different as well.

 

By the way:

2006 - Gear Ratios
EVO & EVO RS.................... EVO MR
1st: 2.785:1 .................... 1st: 2.909:1
2nd: 1.950:1 .................... 2nd: 1.944:1
3rd: 1.444:1 .................... 3rd: 1.434:1
4th: 1.096:1 .................... 4th: 1.100:1
5th: 0.761:1 .................... 5th: 0.868:1
Final drive: 4.529:1 ..........6th: 0.693:1 Final drive: 4.583:1

2004 gear ratios

EVO & EVO RS.................... EVO MR
1st: 2.982:1 .................... 1st: 2.909:1
2nd: 1.950:1 .................... 2nd: 1.944:1
3rd: 1.407:1 .................... 3rd: 1.434:1
4th: 1.031:1 .................... 4th: 1.100:1
5th: 0.720:1 .................... 5th: 0.868:1
Final drive: 4.529:1..........6th: 0.693:1 Final drive: 4.583:1

 

A taller 2nd will give you a higher top speed on second gear but will also lower the acceleration in that gear. A higher final drive will lower the top speed for all gears but will also increase acceleration.

 

Well this is the multiplication factors(GEAR x FINAL DRIVE) in each gear per vehicle...1st gear is a good difference as is 5th gear in each vehicle, and w/ 5th being so deep it is a good thing the MR has a 6th gear for cruiseing...

VIII
1st 12.613
2nd 8.832
3rd 6.540
4th 4.964
5th 3.447
6th N/A

MR
1ST 13.332
2nd 8.909
3rd 6.572
4th 5.041
5th 3.975
6th 3.176

 

Thanks, for my purposes, this is still a good thing because I can always compensate by increasing power. ..and still shift less.

So, I wonder if GSR or MR is quicker in 0-60 now - since GSR has a lower 1st gear and the MR has a higher final drive ratio than the GSR!? - I'm guessing the GSR

more important to my buying decision is which is faster top speed in second gear?! and by how much

- I'm guessing the GSR again.

 

Is it really a straight calculation to conclude the smaller the # (GEAR x FINAL DRIVE) in each gear the quicker the acceleration but the lower the top speed in that gear?

That would mean the 06 GSR is quicker than the MR ?!

 

I think the actual speed achieved is not a linear relationship to (GEAR x FINAL DRIVE) as seen by testing of the 04 models.

If I remember correctly the GSR was faster 0-40, but by 60 mph the MR took over and kept the lead.
the 04 VIII GSR: gear x final drive #'s are:

1st 13.505
2nd 8.832
3rd 6.372
4th 4.669
5th 3.260

UNLESS - the reverse of my prior assumption is true, and the HIGHER the # (GEAR x FINAL DRIVE) in each gear the quicker the acceleration, but the lower the top speed in that gear?

 

W/ a lower first gear you will accelerate faster/harder in that gear, but also top out at a lower speed in that gear do to it being lower...

My calcualtion are for the 06 MR 6/spd tranny against the 06 GSR/RS 5/spd tranny..

Saying that then the MR should be faster than the gsr b/c the MR has lower gears in ever gear and also lower final drive..

but then you have to throw in the fact that you have to shift the MR more b/c the gears top out faster, thus more gears may be needed in the 1/4 mile or 0-60 so it could be slower..

all is speculation right now, until they are tested..

 

Yes - I hope we get some US test data before they release the IX here.

 

OK, I think the main confusion is "what do these numbers mean?" Thusly, I will answer that question. The higher the gear ratio, the faster acceleration. If you've ever played GT3/4 you will notice on the transmission setup map, they have a graph for all the gears. The final drive makes all the lines longer, and changing the ratios changes the slope of the lines. Think of it like this: the higher the ratio, the higher the slope. Think of that slope as the graph of acceleration and you're on the right track. What does the overlap mean? Well that is basically telling you the ability of gear selection. The higher the final drive, the higher the RPM in all gears.
This information is probably about 60% accurate, because I know nothing about cars.

This site may help a bit: http://www.rbracing-rsr.com/gearspeed.html
(that is for motorcycles)

http://www.drivetrainsuperstores.com/calculate.asp
http://ultimategto.com/art29.htm
( for cars, but are ghetto)

 

Yes but if the final drives were the same it would be easy to predict the actual performance difference.

But because BOTH the gearing AND the final drives are different I find it harder to guess-timate how differently each car will perform.

I think it may be hard to decypher without real world test data .

 

I have a feeling the IX might be faster than the IX MR with the new 5 spd tranny.

 

time for me to take this page from ^^^^^

 

Not in my own back yard BM!

 

Ron, you officially own this section, there is no way he can take it from you.
Perhaps we will have to wait, but I think the MR will be faster on a longer course and the RS and base IX will be quicker in AutoX and lower speed stuff.