Looking to do this to the prelude too.
Pricey upgrade but everywhere I have read they say its a worthwhile one.
Looking to add an LSD too which will be even more pricey - lol.
That's a good price from tegiwa ratty
Rich from PAW maybe able to source it cheaper?
Heres some tech I found reading the other day
Source: Type R Owners club forum
http://type-r-owners.co.uk/forums/showt ... dification
Final drive modification
I thought I'd post this for any Accord owners that hang around on TRO.
Revised Final Drive Modification (4.266>4.64)
This modification alters the characteristics of the Accord in a positive way and provides the feeling of more torque throughout the rev range, especially below 2500rpm where the accord can feel a little 'dead' going up any kind of gradient.
The final drive is the final gearing before the wheels. The input from the transmission goes into the final drive receiving a final reduction before entering the drive shafts. The final drive is made up of a ring and pinion gear and is mounted on the differential.
The gearbox is in effect a torque multiplier, the final drive in this case reduces the effort required in each gear and therefore increases the torque at the wheels. In doing so you shorten your gear slightly so top speed in each gear is reduced in favour of better in gear acceleration through ALL the gears. So it's true to say a side effect of the multiplication of torque, is a decrease in rotational speed of the output shaft. On the plus side this decrease in speed is approximately proportional to the increase in torque, a trade off.
The final drive is the gear ratio in a vehicle's differential. The ratio expresses the number of turns required by the pinion (which is attached to the output shaft of the transmission) to turn the drive axle one revolution, i.e. 4.2:1 means the pinion must turn 4.2 times to turn the drive axle once.
A higher number means a lower (or shorter) gear. Short gearing gives quicker acceleration, but because the engine must turn faster for each drive axle revolution.
(A lower FD number equals tall gearing, which will give a higher top speed, at the expense of acceleration).
When making the ATR, Honda used a Final Drive ratio of 4.266:1 at the factory. This was a compromise between acceleration and top speed. As a comparison, the Honda Civic Type R FN2 has an fd ratio of 5.037:1, albeit with a 6-speed 'box.
Higher final drive ratios are used in rally cars & motorsport. They have also been used in performance road cars for over 20 years to increase acceleration. Examples are :
BMW M3 evolution
Renault Clio 200
Honda Civic Type R (FN2)
Renault Clio V6 (mk 2)
Toyota Supra
Honda NSX-R
Honda Integra DC2 (JDM spec)
AC Schnitzer Mini
Mazda RX8 R3
The higher the 'number' of the final drive, the more times the engine has to revolve to produce the same road speed in a any given gear.
This modification is 'safer' than the majority of engine mods, if fitted correctly.
Changing your FD will not affect your speedometer, as the VSS takes the speed from the gearbox, not the wheels of diff assembly. :agree:
Modified FD
Stock FD
Positive points
- Better acceleration (equivalent to an 11% * increase in torque)
* This will not register on a rolling road for various reasons
- The car will 'feel' like it has increased torque
- In gear acceleration can be as much as 1.5 seconds faster in the 70mph+ range
- Increased driveability
- Excellent for track use
Negative points
- Slightly increased rpm (+350rpm in 5th) when cruising on motorway at 80mph
- Slighter noisier at cruising speed
- a lower top speed (154>143mph)
- costs money to buy & fit
- slightly decreased mpg if/when driven aggressively
https://www.youtube.com/user/allisterphillips I have a few vids where you can see the rev counter.
https://www.youtube.com/user/dinovti/videos
