GR Yaris Hello there
- Thread starter Michael Knight
- Start date
Diyman25
Totally Hooked
Can always build a bolt on plate at back for none track day timeI know about Diyman25 solution, but it's perfect for clear road and warm country. I have winter and spring/autumn with muds, and oil cooler will be cover this mud. I speak about this
Spirited
Totally Hooked
- Jan 23, 2022
- 488
- 500
- 93
What's your thinking behind this?
(I would expect toe-in at rear brings stability and therefore would be better for winter)
Spirited
Totally Hooked
- Jan 23, 2022
- 488
- 500
- 93
A couple of items worth considering adding:
- Check rear arches lip for stone chips & repair
- Clear debris from behind the wheel arch liner:
When on snow, with rear toe in car doesn't oversteer in track mode and I don't like sport mode. That's why toe out 1mm total for winter.
During summer and spring/autumn rains I don't want oversteer so rear toe in.
Friend got one few weeks ago and got a test drive - quite something. It was still on run in so not very good test but it must be a weapon on track..!
Ordered a set of Pilot Sport Cup2 for 18'' BBS for track use. Fun to see how they're like compared to PS4S.
Will also check the front toe as front tires seem to wear out from inner shoulder little too fast.
Though the toe out should not be that much so wonder if its really a setup thing (or tire thing).
Will also check the front toe as front tires seem to wear out from inner shoulder little too fast.
Though the toe out should not be that much so wonder if its really a setup thing (or tire thing).
Thinking of some of these myself when my PS4S are done. Will be interested to hear what you think of them.
Was it common for ps4s to wear out on track use like this, or has my pressure been too low / toe out too much for the tire?
Just wondering if I should straighten out toe out.. then again its only 7minutes per tire so shouldnt be much worse than toe zero..
Weird thing that I noted with one tire was that it was unevenly worn - half tyre shoulder was more worn than opposite half - as it was flat spotted..?
Just wondering if I should straighten out toe out.. then again its only 7minutes per tire so shouldnt be much worse than toe zero..
Weird thing that I noted with one tire was that it was unevenly worn - half tyre shoulder was more worn than opposite half - as it was flat spotted..?
Michael for what it is worth the PS4S on my M2 did the same thing. I put it down to tyre squirm from a heavy ish car. More pressure fixed the lazy feeling from the sidewall but resulted in less grip.
Ok so tire is too ’soft’ for any harder driving?
But I will leave the toe out as is.
That was my feeling. I didnt do that much track work though because it was expensive on tyres and brakes. There were a few of us running 4S's on M cars and it seemed common. @Lauren and others have tracked the GRY with the Michelins so they would have much better feedback. My fronts felt soggy where I felt the pressure should be and rolled over but more psi resulted in more understeer until the rear let go then the front was fine
. All stock suspension wise.your toe is fine, increase your caster by .5 º that will immediately stop that inner tyre wear
Can you please explain how you would go about getting that degree of caster and how it would reduce inner tyre wear.
wonder if there's any adjustment left in stock bits or should I add something aftermarket there?
You need the eccentric caster bushings in the rear on the front control arms, it's one of the best mods I have. Some people seems to call it anti dive bushings too.
DobiLux
Absorbed member
- Jan 25, 2023
- 52
- 48
- 18
So one of those two options (don't know if there are any others):
Powerflex FRONT WISHBONE REAR BUSH CASTER ADJUST
Whiteline Front Control Arm Lower - Inner Rear Bushing Kit-Double Offset
thanks for the suggestions! looked briefly the items and they're quite different as Powerflex is adjustable - Whiteline maybe sturdier as no adjustment that could move + closed design is better for winter use? Maybe this could be a good update, just should book a install from a shop that has a press available.
DobiLux
Absorbed member
- Jan 25, 2023
- 52
- 48
- 18
I was wondering the same thing, I don't know what the situation is with the Whiteline, but once it's pressed in you can't change anything (at least as far as I understand it). I wonder if the workshop can get both pressed in exactly the same way and how much difference it makes if the angle is slightly different. I am therefore leaning towards the Powerflex, but so far I haven't found much information on this subject.
Short track session on local small circuit - was fun and rather inexpensive as costs only 30€ for 3hr for last hrs.
