10 replies to this topic

[Brendan O]

On an average day, average temperature, with the perfect radius flat corner (no bank) and a good driver, how many lateral G's can an SM pull with perfect suspension setup and Hoosier SM tires at perfect pressure/temperature? By sustained I mean more than 1.0 seconds. Is more than 1.0 g possible? When I look at my data I see 1.1g and 1.2g but they are for very short spikes that I think is just accelerometer sensor noise.

thanks

[Tom Sager]

I don't know if anyone can answer your question for Toyo or Hoosier as you have asked it. So many corners are not perfectly flat and steering inputs through a corner make a difference as does temperaure and track surface.

[Den]

How about just skid pad data comparison. Might that give a meaningful measurement? Just asking as I have no experience to draw on.

[James York]

On an average day, average temperature, with the perfect radius flat corner (no bank) and a good driver, how many lateral G's can an SM pull with perfect suspension setup and Hoosier SM tires at perfect pressure/temperature? By sustained I mean more than 1.0 seconds. Is more than 1.0 g possible? When I look at my data I see 1.1g and 1.2g but they are for very short spikes that I think is just accelerometer sensor noise.

thanks

Does it matter? Besides the curiosity, will the number cause you to drive or setup your car different?

[JP3]

If some one knows I would like to know .I believe it would help me change set up for different tracks TWS verse TMS. Plus the ones with data can see how big there ba//s are .

[Jim Boemler]

I see just over 1.2 Gs consistently on Toyos, but I've seen other data that indicate more like 1.3. It's in that area somewhere. Not sure how knowing that helps you set up the car, though. Of course you can adjust and try to maximize the number, but in doing so you're back to a self-relative number. I haven't seen the number be terribly sensitive to setup adjustments, BTW.

Sorry, never driven the Hoosiers.

[JP3]

Thanks 4 help with toyos but we now need real world Hoosier facts

[Caveman-kwebb99]

My data on hoosiers suggests that number is just over 1.3 there are no banked turns at Mid ohio. with a max of very close to 1.5.

[Brendan O]

Thanks for input. I'm new to SM. I was not going to use answers to change my driving or setup. I asked because i mentioned 1.15 to a friend who drives 944 and he was skeptical. I'll check my data again. 1.15 was probably not sustained.

[Jim Boemler]

1.15 shouldn't be a problem, sustained, assuming a clean/dry surface.

[Randy Thieme]

On an average day, average temperature, with the perfect radius flat corner (no bank) and a good driver, how many lateral G's can an SM pull with perfect suspension setup and Hoosier SM tires at perfect pressure/temperature? By sustained I mean more than 1.0 seconds. Is more than 1.0 g possible? When I look at my data I see 1.1g and 1.2g but they are for very short spikes that I think is just accelerometer sensor noise.

thanks

As worded the question might have tried to make conditions a little too specific. Probably the reason for some of the responses you got. And comparing to a 944 is a little bit apples-to-oranges. But if the question were reworded to state "with ideal set-up for the tire and all else being equal how much lat G will the new Hoosiers generate compared to RA-1s?" - That is an excellent question since it directly relates to the truth about faster lap times. Any percentage increase or decrease in lat G will give the square root of the increase or decrease in speed through the corner. A 4% increase in lat G will mean a roughly 2% increase in speed. Basic physics will give a new ballpark change in time down a straight-away based on the new corner exit speed. This leaves the unknown changes in acceleration due to rolling resistance, rotational enertia, and/or different toe-in/toe-out. Suffice to say if the Hoosiers do not support a significant increase in lat G then for the rumoured 2 second increase in lap time to be true that 2 seconds needs to come from someplace else.