I might be battling you for last place in SM this year…This will be my first time in the SRT-4 really pushing it. It turns like a school bus so this event might be the test wether or not it should just be a track car.
you can use the throttle lift oversteer to your advantage once you get over being scared of it and are smooth with your steering imputs. I used this many many many times, especially if in the turn-arounds at ECCN. A quick lift to float the rear end could easily save 20 ft of plowing
and on the slalom comment, I’ve been yelling at Wolff for the past 2 weeks for thinking the same thing. I garuntee you are lossing a lot of time with that aproach. i think it all comes from always hearing people talk about being smooth, so people take that too far. Anyways, the reason this is bad is, none of us are so incredibly awesome that we know exactly what the maximum maintainable speed is in a slalom. So if you’re maintain a steady speed through a slalom, how do you know how close or far you are from the breaking point. You always want to use every opertunity to be on the gas excelerating, not maintain constant speed, and you don’t back off till the front tires start to get overworked and thus stop working.
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Agreed. And DP is probably one of the best guys to take advice about driving an MR from. I think it was 2 years ago he rode with me, gave me some pointers, and I went 1.5 seconds faster on my next run.
What I was getting at with the steady speed comment when you are trying to learn an MR, you want to avoid lifting in a slalom. Accellerating to find a little more speed is great, right up until you get a little too much and have to lift. Short wheelbase + mr weight distribution = tail coming around in a hurry.
But, when you think about, what better place to learn the limits than at an autocross. So what if you spin? Now you know next time to go a little slower.
Nah all that does is reduce the contact patch, be brave, less tire pressure in the rear = lower cornering stiffness in the rear:
Cfa - Crb > 0 = oversteer
Cfa - Crb = 0 = nuetral steer
Cfa - Crb < 0 = understeer
For FWD car a is small…
For example a FWD car with 63/37 weight dist a would = 37 and b = 63. Therefore to approach neutral steer the cornering stiffness of the rear should be lower (achieved by running a lower tire pressure).
It’s just that overpressurizing the rear is prefered as it is much easier to control.
Agreed. And DP is probably one of the best guys to take advice about driving an MR from. I think it was 2 years ago he rode with me, gave me some pointers, and I went 1.5 seconds faster on my next run.
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Yeah, I remember that. “Driving too angular”
[quote=“JayS,post:123,topic:27647"”]
What I was getting at with the steady speed comment when you are trying to learn an MR, you want to avoid lifting in a slalom. Accellerating to find a little more speed is great, right up until you get a little too much and have to lift. Short wheelbase + mr weight distribution = tail coming around in a hurry.
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I will give you that our experiences may also differ based on the fact that I had a car that was dialed in well and on R Comps where I believe you were running stock shocks and Falkens. I will say the MR2 did not like being driven hard on street tires. I think it was the sidewalls, and the big front bar and lower grip rubber.
Nah all that does is reduce the contact patch, be brave, less tire pressure in the rear = lower cornering stiffness in the rear:
Cfa - Crb > 0 = oversteer
Cfa - Crb = 0 = nuetral steer
Cfa - Crb < 0 = understeer
For FWD car a is small…
For example a FWD car with 63/37 weight dist a would = 37 and b = 63. Therefore to approach neutral steer the cornering stiffness of the rear should be lower (achieved by running a lower tire pressure).
It’s just that overpressurizing the rear is prefered as it is much easier to control.
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You know I’ve noticed that the STS FWD cars do seem to run lower in the rear while the stock FWD cars seem to run higher air and/or positive camber in the rear. I have no idea about the SP or P classes though, so I’m wondering if that tendancy is due to tires or control over spring rates or …
You know I’ve noticed that the STS FWD cars do seem to run lower in the rear while the stock FWD cars seem to run higher air and/or positive camber in the rear. I have no idea about the SP or P classes though, so I’m wondering if that tendancy is due to tires or control over spring rates or …
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I dunno, I used to run front and rear equal/rear +5psi with some satisfaction on behavior. But, it wasn’t until I took RVD that I got schooled heavily on tire dynamics. And just because something works on paper doesn’t mean that is what everyone is going to do it.
One assumption could be that street tires with softer sidewalls are going to react to tire pressure changes more than r-comps.
I want to set-up legitamate skid pad test to demonstrate these formulas, but I dunno if I have the time/resources availible.
I might be battling you for last place in SM this year…
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Last may be the biggest battle in SM. We may not have suspension for the car - and couple that with my cone killing tendencies and you have a recipe for a high raw time with several cones