Tires wear vs suspension setting
Tires wear vs suspension setting
(OP)
Hi,
What is your opinion on this tire wear?
This pattern occurs on the front tires only.
on the inner side (right side picture) is rougher and more Significant.


Thanks Radek
What is your opinion on this tire wear?
This pattern occurs on the front tires only.
on the inner side (right side picture) is rougher and more Significant.


Thanks Radek





RE: Tires wear vs suspension setting
RE: Tires wear vs suspension setting
Cheers
Greg Locock
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RE: Tires wear vs suspension setting
What kind of car? What kind of racing? If the car started life as a street car, what modifications have you made? In particular, did you fix the akerman?
Gut feeling is this is an akerman / camber issue.
RE: Tires wear vs suspension setting
CapriRacer - What you think: "little background is in order" ?
Is Ford Sierra for hill climb (extremely lowered)
though this wear is after about 20 min run to the circuit
I made modifications knuckle and top mount strut for smooth adjustment camber, caster and KPI
ackerman without modification
I use Avon crossply tires with 0.7-0.8 front / 0-0.2 rear static camber angle
RE: Tires wear vs suspension setting
A toe change might help you. I may have some cool videos of this happening during lab testing of race tires. It's kinda normal in oval track.
Search on youTube for "FLIR tire" and you can watch the phenom causation on some F1 tires during tests. The FLIR will show you the rough spots are the cool areas on the 'tread' as the liquid rubber moves there from the opposite (hot) side. As you may guess, these videos show toe out on straights. The negative camber doesn't cause that much glowation (Is that a real word ????)
RE: Tires wear vs suspension setting
if I understand
This means that more toe-in (now is 0) also will help more front grip?
is right ?
But,
May be occur because of incorrect interpretation tread temperatures toe vs camber correct settings errors?
RE: Tires wear vs suspension setting
What I think is going on is that the camber curve is a little funny and the inside tire is turned too much and has extreme camber. In other words, the camber curve is causing the tire to ride on that edge and the akerman is putting in too much toe. My Capri did that.
First, take a photo of the car hard cornering. What you are looking for is something the shows what both front tires are doing. If the photo is good enough, it will likely show the inside tire leaning inward at an awkward angle and turned too far.
RE: Tires wear vs suspension setting
RE: Tires wear vs suspension setting
I think the inside front tire is turned in too sharply - and that is to be expected because you haven't done anything to the akerman and typically street cars are set up with too much akerman for race usage. This is kind of hard to be sure about, so I'd recommend you study more photos and see if this seems to be consistent.
Second, the opposite of what my Capri was doing, the camber appears to be ..... ah ..... uh ...... "uncambering" for the inside tire. This is contradictory to what the tire wear is telling me. Again, you need to look at more photos to see if this is consistent.
And the tire temps are going to tell you a lot. Just be sure you get good readings.
Side thought: I always thought that taking tire temperatures gave an "average answer" and that the important answer was what was happening as the tire was cornering. The latest videos out of F1 showing the thermal imaging camera seems to confirm this. It is amazing how quickly the tire surface cools. I particularly enjoy the fact that you can see the tire cool down after the tire warmers are removed.
RE: Tires wear vs suspension setting
Norm
RE: Tires wear vs suspension setting
This is a picture of extreme slow cornering(usually race not this slow corners )
in fast corners is inner wheel camber change minimal (about 0-1 degree positive)
Norm - now I think (thanks for your thoughts, Guys!!)
When I modified the knuckle I probably also unintentionally changed (more)Ackerman
Where to changes start?
Toe change ?Ackerman lower?smaller camber?
thus how much should have correctly ackerman for medium fast corners?(about 100km/h)
how much the toe-in?
One more thanks Guys!
RE: Tires wear vs suspension setting
On the other hand, if you aren't going to buy a temperature gauge until later, I would go through the akerman. How much? I think it depends on the characteristics of the tires - and I just do not have any insight into that for bias race tires. What I would do is arrange to go half way to parallel steering and see what happens. If you can do this in steps, so much the better. Hopefully, you'll be able to do this simply. On my Capri, it was a matter of putting washers between the steering arms and the strut.
RE: Tires wear vs suspension setting
different small spacer to insert between will be easy
I then try to toe after?
how much maximum? 0.25"?
RE: Tires wear vs suspension setting
for example-hot inside tire is equals larger toe-out ?-or large negative camber?
RE: Tires wear vs suspension setting
RE: Tires wear vs suspension setting
car is now winterizing
Thanks gentlemens for stimuli and ideas
Thank You all !!
RE: Tires wear vs suspension setting
I'd be interested in their thoughts, even if today they lag a little behind as they did back in the mid 1960s, as reported from 18:30 to 19:30 here-
http://www.youtube.com/watch?v=3Fkk-VbSSvU
RE: Tires wear vs suspension setting
he has approximately zero ackerman
https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-...
RE: Tires wear vs suspension setting
RE: Tires wear vs suspension setting
RE: Tires wear vs suspension setting
I measured all