Final Drive Ratios.

[Nick Mann]

Who understands gearboxes?

The manual gearbox has much lower ratios than the auto, but the biggest difference is the final drive. What chance is there that the final drive is interchangeable? If it is the bit attached to the output shaft, then I think it probably is, but I don't know which bit is which in a gearbox!!

[Nutter_John]

Hi Nick

After the conversation at JF2 I did think about this , it would be great if it could be done , mmmmmm 70 in second would be very nice oh and 100 in third even better

[Axeboy]

I find the manual is far too short ratio'd

[Physician]

I'm almost certain it wouldn't work Nick. Certainly from a physical point of view but I would think that it would also totally confuddle the ECU's.

[Nick Mann]

The ECU's shouldn't be a problem. I'm sure Mo had to a bit of trickery to tell the ECU in his auto to not worry that it was now a manual, but not that the gear ratios are different! The speedo should still read correctly, as that is off the output shaft, IIRC, so it doesn't care what the gearing is before hand.

I will take things apart and inspect when I get a chance.

[Physician]

The ECU's shouldn't be a problem. I'm sure Mo had to a bit of trickery to tell the ECU in his auto to not worry that it was now a manual, but not that the gear ratios are different! The speedo should still read correctly, as that is off the output shaft, IIRC, so it doesn't care what the gearing is before hand.

I will take things apart and inspect when I get a chance.

It just crossed my mind ....... do you have a machine shop at your workplace? If so, have a look at the gearing on any mill, grinder or lathe - you should easily be able to identify which cogs are low/high by removing any inspection panel and watching relationship of speed etc.

(I probably ought to shut up now!)