Quoting fuel:
The 5th gear in my VR-4 is 0.617 but the final drive ratio is the same as the Lancer Evo1-3 which is 3.909. At 100km/h on the odometer I am doing bang on 3000rpm, which as I understand is very close to the 0.666 5th with the 3.545 diff ratios.
That I take it that is an RS (Evolution) Box then since all the ratios and speeds in a given gear at a given rpm match up. The only thing I am having trouble with is terminology. The excel table I have gives the final drive ratio simply as a primary x secondary (this is probably what we call the total final drive ratio). I presume you are referring to the final rear end (diff) ratio? That is listed as 3.908 for the RS (Evolution) which matches.
Dan D, thanks! I did actually already look at Jack's site, but it only gives ratios for 1st through 4th.
I've done some research and it looks as if the EVO III gears are pretty much identical to the RS gears with the exception of first and second. First is right about half way between the stock VR4 first and the RS first whilst second matches the stock VR4 second.
I found this reference on the web from NZ which is simply awesome
Gear Ratio Comparisons If you don't want to wade all through that, THE FOLLOWING is very pertinent: -
Quote:
EVO I-III gearbox ratios etc:
1st & 5th use the same single piece syncros
2nd gear uses the same double (3 piece) syncro
3rd & 4th on Evo 1 box use single syncros. (same P/N as 5th gear syncro)
3rd & 4th on Evo 2/3 box use double syncros & these will NOT fit a vr4, GSR, or Evo 1 gearbox without machine work to the gears.
Evo 1 has taller 1st & 2nd gear resulting in closer ratio gears especially 2nd-3rd gap
Evo 2/3 however have double syncros & a stronger hub on 3rd & 4th gear
Evo 3 box has exact same gear ratios & syncros as Evo 2 but with a slightly taller final drive & different transfer ratio which requires the Evo 3 transfer case to correct it for 3.909. EVO3 = 63 teeth crownwheel and 15 tooth output pinion, mated to a 1.074 transfer case which corrects the rear diff ratio to 3.909.
EVO 2/3 boxes are same internally.
The only difference is EVO2 uses same front diff ratio as EVO1 being 64 tooth crownwheel with 15 tooth output pinion (4.264) for use with 1.090 transfer case ratio = 3.909 rear diff ratio.
A smaller number for gear ratio, (Like Evo 1 1st & 2nd) means they are taller: Less torque at the wheels but more speed for a given rpm.
A larger number (Evo final drive) means it is shorter: More torque to the wheels but less speed for a given rpm.
Power at the wheels does not change significantly with different gear ratios
So it looks like the Evolution GVR4 shares it's secondary with the EVO 1 and 2. Infact I would say the Evolution GVR4 gearbox is EXACTLY the same as was used in the EVO 1. The EVO III gears are still pretty close to the Evolution GVR4 gears other than 1st and 2nd, but an EVO III crown wheel and pinion would require a different transfer case ratio to match the rear diff ratio of 3.909 or things could get messy back there.
So can I match EVO III gears with an EVO 1 or 2 crown wheel and pinion?