12 replies to this topic

[lemanfan]

I have this figures for the race cars:

1998 Cart car 1,42 G
1998 Indy car 1,38 G
Nascar Chevy 2002 1,12 G

All test were run on 200ft skidpad on both directions (left and right) and the result is avarage of both runs.
Does anybody know other test for racing cars? I woul like to know if there was done test with some formula one car?

[Antoine]

I think it depend a lot of the chassis set up mainly for Car like IRL, CART or Nascar that are used to be set up assymetricaly....

The condition of the test take a great importance in this kind of mesure....

[lemanfan]

Runs were done with symetrical setings just like for a road tracks.

[Ben]

Originally posted by lemanfan
I have this figures for the race cars:

1998 Cart car 1,42 G
1998 Indy car 1,38 G
Nascar Chevy 2002 1,12 G

All test were run on 200ft skidpad on both directions (left and right) and the result is avarage of both runs.
Does anybody know other test for racing cars? I woul like to know if there was done test with some formula one car?

Average or peak G? What was the surface? What was the ambient temp and the track temp? Were the tyres appropriate for those surface conditions and temps? Did the driver reach the limit of the car?

I don't mean to sound like a bore, but this is the same problem as 0-60 times which has been discussed on another thread. There isn't enough other info for these numbers to be useful.

All it really says is that 1-1.5G is the range of lateral acceleration acheivable with modern race tyres with negligable downforce and that the Nascar is possibly worse because it has more load transfer. All of those things are common sense and didn't really need a test.

Ben

[Ross Stonefeld]

I think I remember this test, wasnt it done by Motortrend? I seem to recall they used Robbie Buhl's IRL car.

But yeah like Ben said, it showed you the basics. I doubt they even got the tires properly up to temp and doing 'stock' setups on a race car to measure performance kind of defeats the purpose of a race car.

[Lukin]

The Formula Ford got 2g on a regular basis.

[Ben]

Originally posted by Lukin
The Formula Ford got 2g on a regular basis.

We used to see 1.8 on the FS car but only in transients.

Ben

[Lukin]

Originally posted by Ben

We used to see 1.8 on the FS car but only in transients.

Transient? Like smelling salts and mushrooms? Now that sounds like a uni car.

[Ben]

Originally posted by Lukin


Transient? Like smelling salts and mushrooms? Now that sounds like a uni car.

Ben

[Paolo]

Originally posted by Ben


Average or peak G?

In a skidpad test , if properly done, average G is very similar to peak G.

[Ben]

Originally posted by Paolo


In a skidpad test , if properly done, average G is very similar to peak G.

Ok, maybe the question should have been "was the driver any good?"

Ben

[Greg Locock]

Something cropped up a while ago - when testing on a skidpan a given car could go into understeer mode or oversteer mode. I don't see that there is any tendency for the behaviour to flip between the two states without active intervention. Does the driver check for this (or is it so obvious from the feel of the car?).

Also it seems to me that an oversteering car on a skidpan will have a max latacc that is power dependent, which seems a bit daft if you think you are measuring tires.

[FordFan]

The overall numbers won't matter much w/o the details, but they are useful as a comparison between the cars (including the tyres) - on the assumption they were all done at the same time.