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-   BRZ First-Gen (2012+) — General Topics (https://www.ft86club.com/forums/forumdisplay.php?f=23)
-   -   corner exit traction (https://www.ft86club.com/forums/showthread.php?t=37377)

autobrz 05-25-2013 11:30 AM

Most of my experience has been in a autoX. It's been my experience that when I set-up the car to rotate for slower corners, the car suffers looseness in high speed transitions. In order to set-up the car for high-speed transitions, the car will feel tight and want to push in lower speed stuff.

I guess there are two differences in what we're talking about: transitions are not steady state cornering and the high speed I'm used to in autoX is not top speed for the vehicle.

Maybe you're completely right most vehicles will have terminal steady state understeer but I argue most vehicles will also become more loose in transitions as speeds increase. :)

I also didn't take into account aerodynamic lift of the front...

Porsche 05-25-2013 07:32 PM

Quote:

Originally Posted by robispec (Post 959410)
yeah EVERYTHING starts at the road contact patch!


Stops there, too. ;)

Those four, fist-sized, rubber, contact patches are the only thing standing between me and St. Peter. I take good care of them, sometimes altering tire pressures daily, as needed.

Porsche 05-25-2013 07:40 PM

Quote:

Originally Posted by autobrz (Post 959506)
I also didn't take into account aerodynamic lift of the front...

According to German auto mags, there's lift at the rear as well.

So far, I haven't noticed my hood trying to lift up; I'm not keen on carefully scrutinizing my hood, though ... at 100+ mph.

I've got my eyes on other things, not least of which is watching out for the stray Enforcer out cruising around the back country roads. :D

jeebus 05-28-2013 03:12 PM

Even with grippier (Continental DW) tires and more neutral (RCE Yellow) springs, I've oversteered the crap out of 3rd gear on some AutoX courses.

So easy to control though...love it!

autobrz 06-02-2013 11:50 PM

I installed whiteline camber bolts and set them at the max adjustment. So much more front grip and cornering stability. No more strange feeling of the tire rolling onto its sidewall and wobbling back and forth. Now the rear can't keep up and just feels loose. Maybe I got to start driving differently than before and transfer more weight to the rear wheels earlier.

Anyone tried to run a softer rear sway bar than stock to give it more grip? I can't do suspension mods right now or justify that on a car that I'm making payments so the best I can do is maybe take off the stock bar and machine it down to a smaller diameter. I also hate big front sway bars.

edit: whiteline camber bolts are made by SPC, that's what's stamped on the bolt anyway. So if you can find a set branded as SPC, they're the same thing.

robispec 06-03-2013 12:37 AM

remove rear swaybar link...we did

autobrz 06-03-2013 12:49 AM

I want to try that. Do you know how much spring rate the rear swaybar has? stock rear springs are only 195lb/in in the brz. it's already sprung softer than the front taking into account motion ratio. The rear definitely has enough rebound damping though, because when I brake, the car doesn't dive much at all.

infanterene 06-03-2013 01:32 AM

Jeez I think somethings wrong with my car. I cant get it to oversteer. I read threads like this and get a little jealous.

autobrz 06-09-2013 02:04 AM

The rotation characteristics of the car is very eager yet very progressive. This is what makes the car so fun. With adequate front camber, it rotates even more balanced than stock. I marked the front tires with chalk to see how much its rolling over. with 1.4* of camber, the chalk remained right to the edge of the wear indicator. It's just about perfect. Although it's still possible to find more grip by going more camber because tires work better with some of that stuff. I'm already maxed out on the upper camber bolt though.

If a mid-engined car rotated like my brz on corner entry or mid-corner on stock suspension settings, I'd be too busy saving my life every time but with this car it is completely under control and even easy. It's not even oversteer that I experience most of the time. It's just rotation. I'm still getting used to this because my habit has been to get back on the gas as soon as I feel any rotation to plant the rear but for the brz, it is completely unnecessary. All I have to do is let the beautiful balance do its work.

autobrz 06-09-2013 02:11 AM

I forgot the neutral feeling is helped by giving both front and rear a touch of toe-in. 0.04* each.

carbonBLUE 06-09-2013 02:55 AM

Quote:

Originally Posted by Porsche (Post 958003)
Bet you can't do that in SIXTH gear in the automatic! :D

Have you looked at that ratio? Lordy! I figure you guys need to change down from sixth when encountering a slight grade on the interstate. ;)

ive gotten the back end out in 6th on a rain day on the highway by accident... damn Prius tires...

i usually dont have to change down into 5th unless its a pretty decent incline...


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