EVO VIII final drive ratio?
Jun 8, 2005, 11:50 AM
#31
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Ring gear has 43 teeth, pinion has 13...
This results in a 3.307 ratio.
This results in a 3.307 ratio.
I may be able to use this for my project. A 3.15 from an E36 M3 or 3.23 from an M Roadster will suit me better but at least I have some options open.
Thanks everyone.
Jun 9, 2005, 12:57 PM
#33
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Not an EVO at all...
https://www.evolutionm.net/forums/sh...d.php?t=135077
http://www.hayabusa.org/cgi-bin/busa...24;t=25326;r=1
If I go with the Twin Busa setup (most likely) that is where the "rear end" will come into play. The '95 E36 M3 3.15:1 LSD looks like the best compromise between acceleration and top speed. Also, is the EVO rear diff an LSD? I need a limited slip for sure.
If I do go with the EVO VIII drivetrain it will all be in the transaxle. Either an RS 5-speed (LSD) and figure a way to eliminate the transfer case or a Lancer 5-speed (if it bolts up) with aftermarket LSD.
https://www.evolutionm.net/forums/sh...d.php?t=135077
http://www.hayabusa.org/cgi-bin/busa...24;t=25326;r=1
If I go with the Twin Busa setup (most likely) that is where the "rear end" will come into play. The '95 E36 M3 3.15:1 LSD looks like the best compromise between acceleration and top speed. Also, is the EVO rear diff an LSD? I need a limited slip for sure.
If I do go with the EVO VIII drivetrain it will all be in the transaxle. Either an RS 5-speed (LSD) and figure a way to eliminate the transfer case or a Lancer 5-speed (if it bolts up) with aftermarket LSD.
Jun 9, 2005, 01:49 PM
#34
I think our gearing is almost perfect.. Until you upshift to 5th gear. At that point, the car really lays down. There's a link that tells max gear speeds above, but the mph numbers on it aren't correct. The max gear speeds for a US Evo on 235/45/17s are as follows:
1st- 40mph@7000rpm
2nd- 60mph@7000rpm
3rd- 83mph@7000rpm
4th- 113mph@7000rpm
5th- 162mph@7000rpm
As you can see, there's a 50mph jump from 4th to 5th. Fortunately, even with light ECU mods, a stock internalled can see 7800rpm with no problems. 4th gear at 7800rpm is 126.5mph, which prevents most cars (unless they have major mods and quite a large turbo) from having to upshift to fifth in the quarter mile.
1st- 40mph@7000rpm
2nd- 60mph@7000rpm
3rd- 83mph@7000rpm
4th- 113mph@7000rpm
5th- 162mph@7000rpm
As you can see, there's a 50mph jump from 4th to 5th. Fortunately, even with light ECU mods, a stock internalled can see 7800rpm with no problems. 4th gear at 7800rpm is 126.5mph, which prevents most cars (unless they have major mods and quite a large turbo) from having to upshift to fifth in the quarter mile.
Last edited by Noize; Jun 9, 2005 at 02:03 PM.
Jun 9, 2005, 01:52 PM
#35
Originally Posted by Noize
I think our gearing is almost perfect.. Until you upshift to 5th gear. At that point, the car really lays down. There's a link that tells max gear speeds above, but the mph numbers on it aren't correct. The max gear speeds for a US Evo on 235/45/17s are as follows:
1st- 40mph@7000rpm
2nd- 60mph@7000rpm
3rd- 83mph@7000rpm
4th- 113mph@7000rpm
5th- 162mph@7000rpm
As you can see, there's a 50mph jump from 4th to fifth. Fortuantely, even with light ECU mods, a stock internalled can see 7800rpm. 4th gear at 7800rpm is 126.5mph. That prevents most cars (unless they have major mods and a large turbo) from having to upshift to fifth in the quarter mile.
IMO, above ~125mph, the stock gearing in the Evo gets pretty soft.
1st- 40mph@7000rpm
2nd- 60mph@7000rpm
3rd- 83mph@7000rpm
4th- 113mph@7000rpm
5th- 162mph@7000rpm
As you can see, there's a 50mph jump from 4th to fifth. Fortuantely, even with light ECU mods, a stock internalled can see 7800rpm. 4th gear at 7800rpm is 126.5mph. That prevents most cars (unless they have major mods and a large turbo) from having to upshift to fifth in the quarter mile.
IMO, above ~125mph, the stock gearing in the Evo gets pretty soft.
Jun 9, 2005, 01:53 PM
#36
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Originally Posted by RS2
If I were you, I'd go with an RS gear ratio 3 ~ 5 and a custom F.Gear Ratio
Left = RS
Right = GSR
Gear Ratios
1 a 2.785 2.785
2 a 1.950 1.950
3 a 1.444 1.407
4 a 1.096 1.031
5 a 0.825 0.720
Rev 3.416 3.416
Final Gear 4.529 <---- replace this with 4.xx (lower than .529) or 3.xx
Left = RS
Right = GSR
Gear Ratios
1 a 2.785 2.785
2 a 1.950 1.950
3 a 1.444 1.407
4 a 1.096 1.031
5 a 0.825 0.720
Rev 3.416 3.416
Final Gear 4.529 <---- replace this with 4.xx (lower than .529) or 3.xx
That is exactly what I am looking for. Thanks
.
Jun 9, 2005, 02:07 PM
#37
MR _gear spacing_ is way better, because the fourth is a little shorter and the fifth is significantly shorter. I don't know about the longevity of the box, since an extra gear is occupying the same physical space, but I'd be more than willing to try an MR box if I were you.
The only thing that sucks about the 5 speed is the tall 5th, but that was done to preserve fuel economy at interstate speeds.
The only thing that sucks about the 5 speed is the tall 5th, but that was done to preserve fuel economy at interstate speeds.
Aug 3, 2005, 06:01 AM
#40
Originally Posted by RS2
If I were you, I'd go with an RS gear ratio 3 ~ 5 and a custom F.Gear Ratio
Left = RS
Right = GSR
Gear Ratios
1 a 2.785 2.785
2 a 1.950 1.950
3 a 1.444 1.407
4 a 1.096 1.031
5 a 0.825 0.720
Rev 3.416 3.416
Final Gear 4.529 <---- replace this with 4.xx (lower than .529) or 3.xx
Left = RS
Right = GSR
Gear Ratios
1 a 2.785 2.785
2 a 1.950 1.950
3 a 1.444 1.407
4 a 1.096 1.031
5 a 0.825 0.720
Rev 3.416 3.416
Final Gear 4.529 <---- replace this with 4.xx (lower than .529) or 3.xx
Can anyone confirm with some links that the US spec RS has different gear ratio's than the regular EVO VIII? Since I just purchased an RS I am wondering about this because speeds vs RPM are the same in 5th as they are in my 03 Evolution, so I suspect that the 5th gear ratio is identical.... not different like that list shows.
Thanks,
Keith
Aug 6, 2005, 05:05 AM
#41
Unfotunately US-Spec Evo's don't come with the JDM 5th gear ratio 0.825
Try Norris-Designs he might be able to help with the 5th gear ratio "RS"
Thank goodness I have the 0.825, 1 other thing my custom FGR is here
woot! 4months wait 
Installation will be done by end of this month *hopefully*
Try Norris-Designs he might be able to help with the 5th gear ratio "RS"
Thank goodness I have the 0.825, 1 other thing my custom FGR is here
woot! 4months wait Installation will be done by end of this month *hopefully*
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