Trackers, on a scale of 1 - 10...

[Shaun]

Re: Trackers, on a scale of 1 - 10...

Even if tires were non load sensitive, given a slip angle and vertical load, longitudinal drag will increase and the car will scrub speed unless engine power is applied to overcome the drag, which at some point becomes very inefficient and is how many new front wheel or AWD drivers can totally destroy tires in a few laps.

On a perfectly smooth surface, with a perfectly damped car and infinitely stiff chassis, zero compliance bushings and joints, perfectly smooth driver, all yielding perfectly smooth wheelspeed through a corner, it does not mean that the car is not experiencing longitudinal drag from tire slip angle. Longitudinal drag is always present under any steer angle and any usual amount of positive vertical load.

Glad to help, cheers

 

[MachoMan]

Re: Trackers, on a scale of 1 - 10...

Thx for the the explanation. Looks like I'll be getting the RCVD book after I've finished the Carl Lopez one. But the RCVD looks like quite a heavy read.

 

[Shaun]

Re: Trackers, on a scale of 1 - 10...

At this point Caroll Smith's series will probably help you more and be more practical. It is also an intermediate step before RCVD. But even before either, you need to make the most of Lopez + your logger. Those 2 alone are so powerful. Based on your questions and what you've been saying, you have yet to max out Lopez and logger. Put more time into it mate Else Smith and Milliken will be wasted..

==

In previous post mentioned 7 Hz input.. that's 7 Hz wave.. if steering either direction is considered input as it normally is.. then it's 14 Hz.. Either frequency way too high to be driver input.

 

[MachoMan]

Re: Trackers, on a scale of 1 - 10...

Yup. I've yet to apply the Lopez book in conjunction with my logger. Right now I'm still learning to apply the car control part and compromising turns to come out with the right techniques to drive my car with it's present setup on the right line. Also still thinking about how to split the track to analyze different things. Progress hasn't been fast, as I have a day job too you know.. Haha.. But I do realize that I must have a plan, or program for every track day. Or else it's just aimless driving around the track, without specific objectives.

Yup 17hz is too much for driving input. My logger is only 10hz!! This data logger business is really interesting.

 

[Shaun]

Re: Trackers, on a scale of 1 - 10...

Yup! And if the work situation leading up to a trackday does not allow for a specific aim, enough rest, etc. Then try and skip it and save the 6 hour round trip, the 3 hour session, the wear and tear, the $, and hours of extra time required for physical recovery.. and put it towards reading, thinking, discussion, and the plan for next trackday. I know guys who spend 100 - 300K in trackcars, go months or years with many trackdays, with no lists, no short term plan, no long term plan, never having looked at any data though the car comes with good systems. Try and remember everything, go to trackday with 10 questions, come back with 9, or go with 10, return with 15. Spend 250K, 5-10 sec off the pace after multiple practice days, never read anything, been to any sort of driving school, deems them too expensive (3-10K?), dream of winning race series'.

Then there's skipping all the little things that eat up time too like looking for parts or good deals, aimless supper session that stretch 4 hours easily etc.

 

[TripleM]

Re: Trackers, on a scale of 1 - 10...

Damn cheem..
How to clock 2.27 in Mitsughini? Harold asking..

 

[Shaun]

Re: Trackers, on a scale of 1 - 10...

With the tires he likes to run, the car is capable of ~2:24s for a couple of laps. He just has to actually make it to trackdays more often, in a non hungover state, not leave early, and focus more with some guidance on track and off track in between. Intersperse with more seat time.

But expensive cars have psychological guillotine hanging over driver's head.....tough to shake off. Factory coverage, factory low replacement cost changes things dramatically for the lucky few.

 

[totoseow]

Re: Trackers, on a scale of 1 - 10...

haha those tires doesnt fit!!! our friend has to go back to corsas.

 

[Shaun]

Re: Trackers, on a scale of 1 - 10...

Hahah yah.. actually it just rubs a little heheh.. let friction and wear do natural clearancing lol..joking.
Maybe modify the liner..
Actually for learning any decent road tire even will do.. I'm fine with anything as I've always mentioned.

 

[TripleM]

Re: Trackers, on a scale of 1 - 10...

Heng ah the mitsu can't use hooters, giving me chance to chiet.
It Is Fated..... Muahaha

 

[Shaun]

Re: Trackers, on a scale of 1 - 10...

Aiyah, you should have chiet Jeremy when you had the chance to.. in his old car on Corsas