The Transmission / Differential FAQ

Whizbang · 10-16-2008, 01:21 AM

Rally and Rallycross

I am not including any information on this section for the FD as i have never heard of an FD participating in rallying. Whereas i have seen at least on Rx8 compete, it is still an off the wall concept and not to be covered here.

FB Transmissions and Differentials

The FB rear axle is as you may know, a solid axle design. A few things to consider:

Strengthening of axle housing
Retention or modification of suspension geometry.
Reinforcing of suspension mounting points.

The best choice is the 84-85 axle due to the stronger design and lends itself to be the most resistance to deformation.

As far as the differential goes, there are a few other considerations:

An open differential is essentially unusable
A welded differential is a cheap option but may have some issues with how the car performances. One large advantage is that if an axle does break, the other can still get you back.
A clutch type differential is
A viscous type is not preferred due to overheating issues and a weaker design.
A torsen type is not preferred due to overheating issues and a weather design.

FC Transmissions and Differentials

The FC presents an entirely different suspension design. The most important differences is the use of an Independent Rear Suspension (IRS) and the use of Strut / Springs in all corners of the chassis.

What does this mean for you?

Ability to use a better design of rally damper assembly both front and rear.
Existance of the very durable turbo model drive line parts. Especially in regards to the transmission and differential.
There is some debate as to if IRS is better or worse than a solid axle. I may try to cover this in detail later.

As far as the differential goes, there are a few other considerations:

An open differential is essentially unusable
A welded differential is a cheap option but may have some issues with how the car performances. One large advantage is that if an axle does break, the other can still get you back.
A clutch type differential is
A viscous type is not preferred due to overheating issues and a weaker design.
A torsen type is not preferred due to overheating issues and a weather design.

10-16-2008, 01:21 AM	#1
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 20	Rally and Rallycross I am not including any information on this section for the FD as i have never heard of an FD participating in rallying. Whereas i have seen at least on Rx8 compete, it is still an off the wall concept and not to be covered here. FB Transmissions and Differentials The FB rear axle is as you may know, a solid axle design. A few things to consider: Strengthening of axle housing Retention or modification of suspension geometry. Reinforcing of suspension mounting points. The best choice is the 84-85 axle due to the stronger design and lends itself to be the most resistance to deformation. As far as the differential goes, there are a few other considerations: An open differential is essentially unusable A welded differential is a cheap option but may have some issues with how the car performances. One large advantage is that if an axle does break, the other can still get you back. A clutch type differential is A viscous type is not preferred due to overheating issues and a weaker design. A torsen type is not preferred due to overheating issues and a weather design. FC Transmissions and Differentials The FC presents an entirely different suspension design. The most important differences is the use of an Independent Rear Suspension (IRS) and the use of Strut / Springs in all corners of the chassis. What does this mean for you? Ability to use a better design of rally damper assembly both front and rear. Existance of the very durable turbo model drive line parts. Especially in regards to the transmission and differential. There is some debate as to if IRS is better or worse than a solid axle. I may try to cover this in detail later. As far as the differential goes, there are a few other considerations: An open differential is essentially unusable A welded differential is a cheap option but may have some issues with how the car performances. One large advantage is that if an axle does break, the other can still get you back. A clutch type differential is A viscous type is not preferred due to overheating issues and a weaker design. A torsen type is not preferred due to overheating issues and a weather design. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook Last edited by Whizbang; 10-16-2008 at 01:26 PM.