Manual Gear Box VR-4 Owners - Do you feel the gearing is too short?

[valmes]

Brad, you should ask guys at PROS ENG... OWNER: T. Hashimoto (chief engineer)

I've no idea how that speed was achieved.

More on that car here:
http://www.diana.dti.ne.jp/~carplus/...tas/02tas.html

But going from this (alta vista translated page): http://www.diana.dti.ne.jp/~carplus/...ec5a_spec.html ,

Transmission system Mission: 5MT (final modification) <------- Could it mean - "Modified Final Drive Ratio" ???

[valmes]

Found in the following pages:

"Transmission system Mission: 5MT (final modification PROS) "

http://babelfish.altavista.com/babel...s%2f01sas.html

http://babelfish.altavista.com/babel...s%2f02fas.html

http://babelfish.altavista.com/babel...s%2f02sas.html

http://babelfish.altavista.com/babel...u%2febisu.html

http://babelfish.altavista.com/babel...ag%2f02ag.html

SPECS:

http://babelfish.altavista.com/babel...ec5w_spec.html

http://babelfish.altavista.com/babel...ec5w_spec.html

http://babelfish.altavista.com/babel...ec5a_spec.html

http://babelfish.altavista.com/babel...ec5w_spec.html

[bradc]

Hmm noticed that this one http://babelfish.altavista.com/babel...ec5w_spec.html has an uprated torque converter, thats interesting for the auto guys.

I think that the final modification probably does mean final drive. I will see if I can get in contact with T Hasimoto

Thanks again Valmes

[stuartturbo]

some nice stuff there
Torque converter

[valmes]

If our gearbox is the same as EVO4 (that's what I found earlier: W5M51) than we can fit different gear sets made for EVO4?!?

http://www.bpmsports.com/products/gear.htm

[bradc]

We could, but there wouldn't be much of a point really in changing to any that they list. Our stock ratios are:

3.333 1st
2.105 2nd
1.407 3rd
1.03 4th
0.761 5th


4.111 Final

If you compare that to the top DRAG spec out stock ratios are already very close to what they are offering, and the bottom EVO set is the same, but with a really short 5th gear, which is even less useful for us.

Having the first two gears changed to 3.000 and 2.000 could be useful though

[valmes]

Well, I just gave you one example... there are more gear sets from other companies like RalliArt, Shepard etc, just search around. The good thing is they are all stronger... and all of them also offer upgraded transfer cases, front and rear diffs.

That means we can get all the power we want, down to the wheels, without being stranded at some moment by some weak part in our tranny... since we have some offers from the EVO world!

[bradc]

until you blow your AYC diff for the 4th time hehe.

Are you going to change to an LSD soon?

[valmes]

No, I won't go LSD route until my AYC diff blows up again... even than I will try to get EVO8 SAYCs on (thanks Louis).

Btw, on www.sheptrans.com they offer 4.111 as an upgrade option (at $1100 price tag):


"For you stroker guys that have to keep the rpms down through the traps we now offer a 4.11 final drive option. Feal free to contact us by email with your tire size and max engine rpm and we can give you the exact mph per gear."


Makes you think... may be we can supply EVO owners with Final Drive Upgrades?

[valmes]

And one more thought... the easiest final drive mod would be - just changing the tire size!

[Kenneth]

And one more thought... the easiest final drive mod would be - just changing the tire size!

Thats true, but I think you would have some serious issues with clearance of the suspension arm (the vertical bent one)

You would need to run a very low offset if you wanted to avoid this, and this could cause other handling problems.

When I get my backside into gear and get the Galant drivable then ill let you know how it drives with the Evo gears

[valmes]

Thats true, but I think you would have some serious issues with clearance of the suspension arm (the vertical bent one)

You would need to run a very low offset if you wanted to avoid this, and this could cause other handling problems.

When I get my backside into gear and get the Galant drivable then ill let you know how it drives with the Evo gears

Thanks Kenneth.
Waiting for update!

PS: The widest tires on my car were 265/40/17 (102% from the original height...) ... clearance was minimal, but everything worked just fine! (I've got 20mm spacers on each wheel) no handling issues... at least in 4 years of ownership I didn't notice any.

[Kenneth]

PS: The widest tires on my car were 265/40/17 (102% from the original height...) ... clearance was minimal, but everything worked just fine! (I've got 20mm spacers on each wheel) no handling issues... at least in 4 years of ownership I didn't notice any.

Thats a fairly minimal change in rolling radius though, so I wouldn't expect any clearance issues. (only 0.25mm more RR than 235/45 17s which are commonly used)

Do you know what the wheel offset was without the spacers? I am interested to know what total offset you have I put 255s on my old Legnum with a 35mm offset and it seemed to be fine (would have rubbed the guards without rolling though)

[zentac]

Sorry, not got time to read 3 pages, but what about the V6 gear ratio's thats what Im running

1st = 3.583
2nd = 1.947
3rd = 1.379
4th = 1.030
5th = 0.767
Final = 3.722

I have approx the following top speeds in each gear.

1 gear = 37.739 MPH
2 gear = 69.450 MPH
3 gear = 98.056 MPH
4 gear = 131.280 MPH
5 gear = 176.296 MPH

[Nick Mann]

Can you just put the V6 gears in the VR4 box? That would seem a bit too easy! Surely the design is slightly different to accommodate the 4WD system?

[zentac]

I dont know without having a vr4 box to strip, but knowing mitsi probably. if you look at aCAPS the gears seem to be common across quite a few platforms, so it may be possible.

[bradc]

Those gear ratios are the same as any Galant/Legnum 2wd/4wd Manual V6 2.5 N/A.

The VR-4 ratios aren't too different, they are 3.333, 2.105, 1.407, 1.031, 0.761. As you can see first is a bit shorter on Richards one, probably to help get the N/A engines off the line easier.

The reason his gears are longer is because of the 3.722 final drive that came with all of the 2wd v6 2.5's. Mitsi made the 4wd versions with a 4.055 final drive and the same gear ratios. In fact all Legnums were like this, with 1.8, 2.0, 2.4 and 2.5 engines, each engine had the same gear ratios, but the finals were different between the 2wd and 4wd variants.

What I don't know and can't find out is if the 3.722 final drive gear would be compatible with either a 4wd ST-R, or a VR-4.

[Beastlee]

Reading this with much interest and would love to know the outcome of the investigatons.

I always found the Auto to run very high(over 3000rpm at 80mph) but looking at the manual this is even worse. I assume that the manual has that little stronger response at speed in gear or am I wrong?

I know my 9000 loves to cruise at 80mph and it's more like 2500rpm but then it has the most amazing torque curve you could ask for with a peak at 1800rpm!

[bradc]

When the auto is at 2500rpm, about 70mph, the manual is already at 3000rpm. The combination of a 3.72 final drive and a 0.721 5th gear would take make the gears almost identical from the auto to the manual box.

[Beastlee]

That's muh more acceptable. It's a good job I won't be paying much for my fuel if either way, I'l be cruising at 130kmh+ quite a lot