Skidpad performance?

Post by **jtbo** » 01 Mar 2007 07:29 pm

I would like to know what speed, time or how many G's 340 or 360 can get on skidpad, also would like to know if it is 150ft, 300ft or what kind of skidpad.

If there is no data available maybe someone would have time and willing to try out?

Post by **Ali** » 01 Mar 2007 09:25 pm

Jani, if you remind me once my car is on the road again i'll borrow my mates g-tech and get you some readings, I tried it on my old 340 totally standard but can't remember how many g's it pulled

Guessing you want standard car data though?

Post by **jtbo** » 01 Mar 2007 10:33 pm

Ali wrote:Jani, if you remind me once my car is on the road again i'll borrow my mates g-tech and get you some readings, I tried it on my old 340 totally standard but can't remember how many g's it pulled Guessing you want standard car data though?

Standard would be nice, but it is ok to have data from your car too as I think I have pretty close settings for that one too so I can compare, which ever is more possible to you

To get useful readings you should find or mark circle that has radius of 150-300ft then start driving slowly increasing speed, find speed where it does not understeer out but yet you can't accelerate any more, there is maximum cornering speed and what g-meter reads at that time is maximum later g-force car can get on skidpad.

This kind of testing is same they use at car factories etc and provides most useful data.

Niels is friend that tests bit of physics too and he made little test video, it is bit too easy to drive still, imo, but just to get you excited

http://www.youtube.com/watch?v=lGZv9R0OKV8

Post by **Chris_C** » 02 Mar 2007 01:09 am

What sort of G's are we talking about? If it's under 2 I can reprogram a circuit board I've got lying here and test it out on Fake at some point...

Post by **340cbr** » 02 Mar 2007 02:14 am

How can I get a G-meter?

Post by **jtbo** » 02 Mar 2007 02:48 am

Chris_C wrote:What sort of G's are we talking about? If it's under 2 I can reprogram a circuit board I've got lying here and test it out on Fake at some point...

Superduper great sport cars with hyper high performance tires can get perhaps even to 1.3Gs but I'm pretty sure Ali's car will top out at 0.85-0.9 at max on skidpad, I suspect that stock 360GLT will top out below 0.85 no matter what.

For comparison at 200ft skidpad S60R does get 0.85Gs (understeer, understeer) Lancer Evo 8 gets 0.95Gs (no understeer), Corvette Z06 pulls 0.98Gs and Lotus Elise 0.99Gs. There is no car that can exceed 1G at 200ft skidpad with street tires that I do know about.

However when spinning or driving in larger skidpad forces of course are bit greater, but not too much. I'm sure 2G is well enough and if it goes over it you can just put error handling for it

Currently my mod is very unrealistic as it pulls over 1G, so that is one of areas to improve now.

Would be great if you guys can help with this, big thank you in advance to you

I don't know what is cheapest way to get G-meter, but here is some link:
http://zedomax.com/diy/102/diy102.htm

Post by **Chris_C** » 02 Mar 2007 10:46 am

The one major problem with any g-meter is trying to keep it flat, there's always a constant pull of 1g downwards, which is gravity itself. When the car rolls in a turn, the accelerometer feels a component of that gravity (equal to sin(bodyroll_angle)) This gets very significant, as the initial slope of a sin curve is very steep, so an error value creeps in that way. Thats prolly why thay guy see's 0.4 g in that webpage, due to the body roll (hmmm, actually, maybe not, that would be a bodyroll of 22degs, which only a dodgy suspensioned 300 would manage). By the same token, the actual g created by the turn is the only felt as a component of the actual force by the accelerometer, again, because it is tilted.

I've got parts lying around somewhere to make a self stabilising platform to chuck a camera on for filming, but have never got round to it like half the random projects lying around here

Post by **Ali** » 02 Mar 2007 02:13 pm

Yeah I seem to remember the g's being easily below 0.8 but can't remember a figure

Trouble is that i'll understeer a lot earlier than if I didn't have a welded diff, round a constant radius accelerating gradually the diff is going to be awful as its always going to want to push me straight ahead, i'll try to get you some data when its on the road anyway

Post by **jtbo** » 07 Mar 2007 01:09 pm

Now I'm having 0.85G that might still be bit much then, must test more of it, for some reason I'm not getting too much of difference with open/welded diff, must research that bit more then, maybe some bug in game, there are some and can't get it as real as I would like to.