Hebiki

iTrader: (26)

yup.

AdrianM

iTrader: (4)

From an engineering standpoint the front and rear belt should NOT be equal in length. Due to weight transfer on power the rear belt will always have a higher torque load and thus would have a higher percentage of stretch under load requiring more belt tension to prevent slipping and thus resulting in a reduction in efficiency.

In an ideal belt drive train the rear belt must be shorter than the front in proportion to the torque loading and belt stretch percentages. This will allow lower belt tension and greater efficiency.

There is also the concept of "take up” or the amount of time it takes for the belt to come under tension and begin to drive a diff pulley at its maximum loading. The longer the rear belt is the later it will start to drive the rear wheels forward due to the same torque load and belt stretch issues. This can result in the front wheels pulling more than the rears are pushing on power and this can have a negative effect on handling.

Once again a short real belt and a longer front belt balance the "take up" and times the front and rear diffs so they drive the car forward simultaneously.


All of these details cause TINY effects in a cars handling but when you take these details and add them up with other equally tiny details you end up with really good touring cars. This is why all the current top level sedans look the way they do.

I am not knocking the TA05. It is a great handling and well designed car. I just wanted to point out a few details about what goes into drivetrain design.

nexxus

iTrader: (315)

*Insert Schumacher plug here*

syndr0me

iTrader: (32)

What's up with the ugly battery strap on the MS? The car is otherwise gorgeous, but that thing looks like it belongs on a toy, not a race car.

peejay

Yes it is.

Yes it is - 232mm.

sosidge

Clearly the Schumacher design team didn't understand these basic fundamentals when they were building the Axis 2.

HI_808

Thanks for that info Adrian,

I am curious to figure out what the implications of touring car belt length are when considering braking situations. I know that there are other factors when considering handling, but it seems as if we are isolating different drivetrains from their respective platforms to compare them only in that respect.

According to you, the rear belt is subjected to greater forces of torque on-power because weight is being shifted to the rear. The converse, therefore, should also be true: the front belt should be subjected to greater amounts of torque while slowing down since weight is being transferred forwards.

Now in a touring car with 4-wheel braking, while braking, the load should be greater on the front of the car and should result in lot of stretching of the front belt. And that, in turn, will cause the rear differential to engage more quickly than the front one. If we factor in a car with a front belt being considerably longer than the rear belt, won't that lead to issues while braking?

Kenneth Tan

iTrader: (1)

Maybe we spend more time on power than braking?

sosidge

I think you may be right. If they were equal surely the blue belts would be fitted? If so this car is not a TA05 at all.

tc3team

some dont though.... hehe

HI_808

I never questioned the logic behind using different length F & R belts over isometric belts. The point AdrianM brought up that I am interested in is about belt length and handling characteristics.

Thanks

Patriiick

iTrader: (3)

If you compare the porsche special edition front topdeck, with the TA05MS front topdeck, the MS version is much longer, thus implying a longer front belt since the other elements of the car are identical..

So my conclusion is: front belt is longer than the rear.. it s more than a revised TA05..

peejay

Belts are equal in length but shorter than the regular TA05 belts.

Oh, and yes you are right: it isn't really a TA05 at all. It is a one-off, that uses some TA05 and TRF415 parts, and, maybe, the chassis plates are the same as the TRF501X, but I could not swear to that.

sosidge

I think you must be talking about the 30th Anniversary car whereas we are talking about the TA05MS.

Kenneth Tan

iTrader: (1)

Never intended it to be a wise arse response , I was thinking that maybe even with the front belts stretching as much as the rear was per burst of power, it is at a much reduced rate.