Rally Cars tech stuff

In the book I have about suspension etc, there's a summary what cause different behaviours of a car.
Some of the below are obvious and others apply better to a formula racer but I listed all of them.


Understeer:


Rear anti-roll-bar too soft.
Front anti-roll-bar too stiff.
Toe-in too big.
Wrong camber angle (usually too positive at the front and too negative at the rear.
Front tyre pressure too low.
Rear tyre pressure too high.
Too soft tyre compound at the rear.
Too hard tyre compound at the front.
Too little down force at the front.
Too much downforce at the rear.
Too much weight at the front.


Here is an web site about AWD / 4WD systems and different makes AWD / 4WD systems.

Racing engine technology artcile on Ford Fiesta WRC engine
Race Engine Technology - Dec/Jan 2012
Highly recommended article for anyone interested engine technology

Quote:

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Originally Posted by makinen_fan

Racing engine technology artcile on Ford Fiesta WRC engine
Race Engine Technology - Dec/Jan 2012
Highly recommended article for anyone interested engine technology

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Automotive porn

Does anyone know if any of the current WRC cars use any form of TVC (Torque vectoring control)? Obviously front and rear active diffs were banned a couple of years ago but would the simpler, slightly less effective systems that simply brake individual wheels (limiting torque transfer to around 50%) as used on some the latest road cars be legal ?

I'd be interested to know the actual wording of the FIA's ban on these devices if anyone has any ideas on where to find it.

Some articles on the subject:

Torque-ing up for the corners - Torque Vectoring Control - Cars Bikes Trucks

Torque Vectoring and Active Differential

In my opinion they don't use it.

they use electronics and sensors so they cant be used.

Dimvi, am i correct to assume that brakes are kept purely mechanical without any form of electronic support?

Quote:

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Originally Posted by makinen_fan

Dimvi, am i correct to assume that brakes are kept purely mechanical without any form of electronic support?

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exactly, only two pumps - one for front, one for rear, plus handbrake pump... everything purely mechanical.

Is there any specific item on the FIA regulations (including regional championships) that won't enable a car with lower cubic capacity to run in a 'bigger' class.

For example: a R2 car run in the R3 class.

R2 and R3 are not classes. One is class 5 and the other class 6. And I think it is not possible because if You enter wrong class the stewards of the meeting will put You in the correct one during scrutineering. Classes are no longer created purely according to the engine capacity.