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Forum: Tracking / Autocross / HPDE / Drifting

09-06-2020, 11:11 PM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

But frequently they are... In particular the OEM...

But frequently they are... In particular the OEM Primacies are known to be unforgiving at the limit. For me, Hankook RS4s are a *great* tire for newbs to bring to the track. Fun and forgiving...

Forum: Tracking / Autocross / HPDE / Drifting

09-06-2020, 10:45 PM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

For me, "as an instructor" (nyuk), I strongly...

For me, "as an instructor" (nyuk), I strongly prefer my students to be on track-appropriate tires.

Forum: Tracking / Autocross / HPDE / Drifting

09-06-2020, 09:12 PM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

Skidpad practice will train muscle memory on how...

Skidpad practice will train muscle memory on how to deal with loss of grip at either end with both the steering wheel and the throttle. Highly highly highly recommended...

What do you mean by...

Forum: Tracking / Autocross / HPDE / Drifting

09-04-2020, 01:32 PM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

I disagree w/ treedodger's link! If we are...

I disagree w/ treedodger's link! If we are talking about on-track at-the-limit driving on street tires, I think that even Max Perf tires are generally too soft-sidewalled. Particularly in...

Forum: Tracking / Autocross / HPDE / Drifting

09-04-2020, 12:52 PM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

Yes, I am saying that good extreme perf tires...

Yes, I am saying that good extreme perf tires like RE71R, A052, etc. *are* quite forgiving at the limit, much more so than most passenger car tires.
I think that when novices *do* reach the limit on...

Forum: Tracking / Autocross / HPDE / Drifting

09-04-2020, 10:15 AM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

Absolutely! Wet and dry skidpad training for...

Absolutely! Wet and dry skidpad training for novices *before* getting on the track is a GREAT idea, but I've only been at one track day where that was done (BMW CCA event at Mont Tremblant a long...

Forum: Tracking / Autocross / HPDE / Drifting

09-04-2020, 09:44 AM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

How old do you reckon that is? For sure that...

How old do you reckon that is? For sure that plot is going to be different for every tire, and IMO it's not necessarily giving an accurate picture of grip vs. slip angle for current race tires vs....

Forum: Tracking / Autocross / HPDE / Drifting

08-30-2020, 12:57 PM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

There's a LOT more residual sliding grip and a...

There's a LOT more residual sliding grip and a LOT more control in a slide on good Extreme Perf trackworthy tires than on OEM Primacies. IMO a novice is going to be more likely to keep the car on...

Forum: Tracking / Autocross / HPDE / Drifting

08-28-2020, 04:49 PM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

FWIW I kinda disagree with the notion that decent...

FWIW I kinda disagree with the notion that decent tires for the track inhibit learning. With track-appropriate tires you'll have a better time and learn more, quicker, IMO!

Forum: Tracking / Autocross / HPDE / Drifting

08-28-2020, 09:05 AM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

Yeah, weird wear pattern but I think you're...

Yeah, weird wear pattern but I think you're assessment is correct, lotsa deformation due to flimsy sidewall and smallish treadblocks.

Yeah, car is a lotta fun! You'll really love it at the track...

Forum: Tracking / Autocross / HPDE / Drifting

08-19-2020, 12:26 PM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

IMO dialing in more scrub, i.e. more toe, would...

IMO dialing in more scrub, i.e. more toe, would be more considered compensation for a compromise elsewehere!

Ive never had any problems running near-zero toe on any of the rear-drive cars I've...

Forum: Tracking / Autocross / HPDE / Drifting

08-19-2020, 10:29 AM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

Which, funnily enough, is 1/15 of an inch!

Which, funnily enough, is 1/15 of an inch!

Forum: Tracking / Autocross / HPDE / Drifting

08-19-2020, 09:17 AM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

One fifteenth of an inch? :lol: ...

One fifteenth of an inch? :lol:

I've never found more toe to feel more stable, sometimes the opposite. I've never had issues running minimal rear toe-in. IMO anywhere from zero up to...

Forum: Tracking / Autocross / HPDE / Drifting

08-18-2020, 02:19 PM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

I think it might be a fine idea, I bet a 6-pack...

I think it might be a fine idea, I bet a 6-pack that the reason your toe is out is that they just took away all your front negative camber, then saw that the toe change was still "within spec" and...

Forum: Tracking / Autocross / HPDE / Drifting

08-18-2020, 09:16 AM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

I have no instability whatsoever under hard...

I have no instability whatsoever under hard braking at the track with super-sticky Hoosier A7s on my car with -3.3* front camber. The idea that camber kills braking performance is an ancient trope...

Forum: Tracking / Autocross / HPDE / Drifting

08-18-2020, 09:13 AM

Replies: 57

Tire Contact Patch and Vehicle Stability - Alignment

Views: 7,835

Posted By ZDan

Fuggin *morons*. This car needs as much negative...

Fuggin *morons*. This car needs as much negative camber up front as you can give it. Take it back and have them *maximize* negative camber up front. Take it to another shop if they won't. -1.5*...

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