GEARBOX RATIOS EXPLAINED

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EVO-00X

EVO-00X

4G63T AWD CC COUPE
Joined
Jun 17, 2005
Messages
8,151
Location
Newcastle
OK, I was going to revamp this 5+ year old post with clearer formatting and much more comprehensive information, but for some reason it wont accept the large amount of info in this thread, even when I strip the text of all formatting and code???

Anyhow, Ive put all my info up on the Evocoupe website for you: http://www.evocoupe.net/forum/viewtopic.php?f=2&t=4070&p=36895#p36895

You'll find gearbox codes, ratios, tooth counts, transfer case, diffs, LSD's, basically a lot of the drivetrain tech info in the one spot :)

Rob. (EVO-00X)
May 2013
 
Also 'Mr Gears' from Meek made this comment about the Eclipse gearbox :)

Mr Gears said:
There are many more attributes that make this the perfect FWD turbo transmission. Aside from the classic design flaws.

Both 1G and 2G use the same clutch as GSR/EVO/VR4, this means the world of performance clutches is open to you, and also an extra 15mmm in diameter.

Dual syncro on 2nd gear (2G models).

27 spline driveshafts

Replacement gearsets can be used from local models.
Click to expand...
 
In relation to the VR4 ratios my reading of the manual I have looked at provides the only the following :

W5M 31 : 1st ,2.846 ; 2nd, 1.684 ; 3rd; 1.115 ; 4th, 0.833 ; 5th,.690
W5M 33 : 1st ,2.846 ; 2nd, 1.684 ; 3rd; 1.115 ; 4th, 0.833 ; 5th,.666

My concern is with the box early KM 255 box what are the ratios for these? I have check the differential ration in the rear axle and that is approx 3.5 which I understand equates to the 3.545:1 ratio.

Anyone have this info? Cheers.
 
I cant find the KM255 ratios, my manual only has the KM182
 

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Although I have found this thread, look post #13 by VR-4SQUID

http://www.4gtuner.com/topic/20287-centre-diffs/
 
RVR HSG Manual 1st gear ratio =3.083
2nd gear ratio =1.684
3rd gear ratio =1.115
4th fear ratio =0.833
5th gear ratio =0.666
Rear gear ratio =3.166
HSG Auto 1st gear ratio =2.551
2nd gear ratio =1.488
3rd gear ratio =1
4th fear ratio =0.685
Rear gear ratio =2.176
 
Interesting one here.
I appear to have a hybrid RVR/ Galant VR4 RS box here.
Tooth counts are...
1st 36/12 3.00:1? - seems likes an RVR manual 1st gear RS should be 2.57:1
2nd 32/19 1.684:1 RS should be 1.6:1
3rd 29/25 1.16:1 - Correct for RS
4th 25/29 .862:1 - Correct for RS
5th - didn't write down the count but its a .617 ratio which is correct for an RS.

It also has an open diff but has steel shift forks in it, again correct for an RS (the shift forks that is)

I'm guessing that someone killed the original 1st or 2nd gear and replaced the input shaft and those gears with a set from an RVR at some point.
I might put this one back together using a dsm input shaft and 1st gear for anyone that wants to rally one. Should make for a fairly short box for someone. No good to me as I drag race and need longer 3rd and 4th.
I think I'll keep the 5th setup for another box though and install a stock VR4 5th.

Actuall the RVR seems to have the same ratio setup as the DSM 1g. Makes for a stronger 1st gear in a VR4.
Does anyone have an actual tooth count for an RVR 1st gear?


I also found this page that has the ratios listed.
http://www.goo-net-exchange.com/catalog/MITSUBISHI__GALANT/4006793/
 
brisvr4 said:
1st 36/12 3.00:1? - seems likes an RVR manual 1st gear RS should be 2.57:1
2nd 32/19 1.684:1 RS should be 1.6:1
3rd 29/25 1.16:1 - Correct for RS
4th 25/29 .862:1 - Correct for RS
5th - didn't write down the count but its a .617 ratio which is correct for an RS.

Does anyone have an actual tooth count for an RVR 1st gear?
Click to expand...

Tim... yours will be:

1st 3.08 = 37/12 from a Mitsubishi 1G Eclipse / HSG RVR
2nd 1.684 = 32/19 from a few cars. Single synchro version of this ratio came in early GSR, Eclipse, RVR and VR4. Double synchro of this ratio came in latter GSR's, EVO II & III.
3rd 29/25 1.16:1 - from a few cars. Single synchro version of this ratio came in RVR, VR4 and EVO I. Double synchro of this ratio came in EVO II & III
4th 25/29 .862:1 - from a few cars. Single synchro version of this ratio came in RVR, VR4 and EVO I. Double synchro of this ratio came in EVO II & III
5th 21/34 - from a few cars. Single synchro of this ratio came in EVO I, II & III

Hope this sorts you out mate. If you need any more info or advice for what mixes and matches together just give me a yell buddy :)
The original post in this thread is HEAPS OLD and I have since recorded the ratios and tooth counts etc from a number of assorted W5M33 AWD gearboxes Ive rebuilt to help me identify parts and gears.
I will update the first post soon.
 
That's the issue though Rob, my 1st gear is 36/12.
Counted 4 times to make sure!
Aha! It seems that I have a std input shaft but a VR4 RS 1st gear thus explaining the weird ratio.
 
VR4 EVO = bit of a leprechaun as Ive never had one to check! They're pretty hard to come by and it would be good to have its specs recorded.

If its 36 tooth, the only other W5M33 gearbox I know that runs it is the EVO 1.
But the EVO 1 needs its mating input shaft with 14 teetth for first gear to make it 2.571

RVR first gear I have here is 37 teeth.

You know what... whats the chassis number for the EVO 0??? I will look up the parts in ASA to check.
 
RS VR4 has a 2.571 1st gear too Rob.
It seems to be basically an Evo 1 box which does make a lot of sense to me as the era is similar.

I think I'll just get an Evo3 input shaft and 1st gear and make another drag box :)
 
Yep, checked ASA and the E39A SNPF/SNPF4 models shows a listing of a 37 tooth 1st gear and a 36 tooth 1st gear. ;)
They also came out with 2 different input shafts. This would make sense as you need the matching input shaft to suit whichever first gear you are using.
See pics attached.

And yes... The EVO 1 CD9A input shaft with part number MD747885 matches the same part number as used in a variant of the E39A SNPF/SNPF4 .
And yes... The EVO 1 CD9A 36 tooth first gear with part number MD748095 matches the same part number as used in a variant of the E39A SNPF/SNPF4.
So yeah.... one of the E39A SNPF/SNPF4 models came out with the same first gear and input shaft as the EVO 1..... could very well be the EVO 0 ;)
 

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Comes down to how much power you have and whether you can get it to the ground when you launch.
Going to a lower (numerically higher) gear does increase off the line performance but its useless if all you do is make the tyres spin going nowhere, causing you to snap shift to 2nd immediately after launching.
Drag cars with big slicks can afford to do that because they have grip ;)
 
Yeah DSM 3.08 would spin through. GSR is 2.917 and not much better even when I had 200-220kw in my car it was lighting up first gear with the GSR 3.545 rear diff ratio. EVO II/III is 2.750...... but EVO1 has a 2.571. Reduced spin off launch and will get you further out before shifting into 2nd.

Here's a vid of my brother's purple coupe with EVO 1 ratios in his car. Watch how even though he took off late, the EVO 1 first gear still worked well for his car running only 180-190kw atw at the time.
It would also benefit a FWD car to reduce wheel spin off launch. Different setups, tyres (slicks), suspension etc all play a part in the big picture obviously.

 

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