Gearboxes - The options

[tontvti]

After Ray took me for a blast a in his EK yesterday the 2nd and 3rd gear in the MB6 felt incredibly slow

Common swaps seem to be

s80

y21

Does anyone know the top speeds for these when attached to an MB6?

You can get a Y21(apparently LSD) for less than £250 so any info on this box would be good. The below link means nothing to me.

http://www.ff-squad.com/tech/temp/Bgears.htm

After market internals - syncros, LSD's and final drives. What are the pro's con's and trade offs with these??? Like do aftermarket syncros usually whine when you beat on it??

But I'm conflicted because for daily use I'd still like to be able to hit at least 140 and is it possible to get a sensible 80mph cruising RPM aswell.

Yes Ray, I've been converted BTW you should seriously invest in some harnesses, its a world of difference

[Jason.s]

The Y21 has an optional LSD. The LSD models are very hard to come by. Its easier to get the S80.

Whats your need for doing 140mph though? lol even on your average track day you`d probably struggle to reach that on a fairly average tuned engine ie the basics done.

You`ll still reach that with a Y21 yes, The S80 you will aswell if you have the 4.4FD version and im not sure what the 4.7FD will reach.

[tontvti]

According to the link above the Y21 has the same ratios for 1st, 2nd 3rd as the S80 but a lower final drive so wont be as aggressive. I've seen LSD Y21 for sale for £250.

Why need 140?

Maxing out at 110 is very annoying and your car will be screaming if you ever cruise anywhere at 80mph.

After 3hours of internet searching it looks like the only good option actually is the s80 or a custom built box.

Hmmmm...... luckily I know a man with both

[digitalfaze]

I agree, why on earth you would want to get to 140mph, you can only ever do that in a straight line.......Fun is not a straight line

[adeel]

i have an EK9 gearbox in my MB6 and its an amazing Mod - big difference in accelerating

especially as i got it with only 46k Kilometers on it !!

[gazman]

Tontvti, the S9B gearbox in the MB6 hits redline in 5th at 154mph. An S80 gearbox in the same car hits redline at 149mph. The car cannot go this fast so you won't run out of gear...

The reason the S80 is so much better is the shorter 2nd gear couple with higher ratio final drive means you have 23% more wheel torque in that gear. That's a lot!

To put it this way, that 23% increase in wheel torque halves the difference in acceleration between an MB6 in 2nd gear and an Integra Type R

[digitalfaze]

Tontvti, the S9B gearbox in the MB6 hits redline in 5th at 154mph.

hahaha i never knew that, only had it to 137 mph and i crapped it and slowed down, still a long way to go too but always wondered what the top speed of these bad boys were

[Guest]

So if I change my box to an s80 then 5th gear shouldn't be too much different?

[noodels]

So if I change my box to an s80 then 5th gear shouldn't be too much different?

http://cars.homenetcs.co.uk/honda-civic ... earbox.htm

1"£££$££"!!

[gazman]

Tontvti, the S9B gearbox in the MB6 hits redline in 5th at 154mph.

hahaha i never knew that, only had it to 137 mph and i crapped it and slowed down, still a long way to go too but always wondered what the top speed of these bad boys were

The redline of the top gear is not the top speed of the car, just the highest speed the gears will allow. A standard MB6 will never top 140mph.

The Mclaren F1's top speed was originally 230 ish mph, but that was limited by the rev limiter kicking in at 7500rpm at that speed in 6th gear. When they removed the limiter it did over 240mph because it had the power available to do so.

In our cars it's more the opposite in that the top gear is beyond what the car can do anyway. If you need any proof that 2nd is waaay to long, my friends Audi S5 is geared to hit redline in 2nd just beyond 60 (as opposed to 69mph in a M). That's with 350hp on tap...

The jump from 1st to 2nd and 2nd to 3rd (and even really 3rd to 4th) is too great. An Integra box (S80) or EK9 box is perfect to improve our cars acceleration and the slight reduction in top gear from 154 to 149 is not too bad as to increase cruising rpm's too much.

A "perfect" box in my opinion would be an Integra 98 spec box with standard 1-4 ratios: 3.23, 2.105, 1.46, 1.034 then an LS 5th 0.74 and finally an upgraded FD of 4.929. This would give decent acceleration throughout the range and the extended 5th would bring improved motorway mpg without being too harsh a jump from 4th.

This box would provide an increase in actual torque at the wheels on the order of: 1st gear +17%, 2nd gear +27%, 3rd gear +23%, 4th gear +10%. In my opinion this would drastically improve the real world driveability of the car. Having almost 30% more power on tap when going for an overtake at lower than motorway speeds is obviously a big improvement!