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Tyre roll.
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qedrat
Posted 29/8/2016 9:12 AM (#722635)
Subject: Tyre roll.
Member

Posts: 66
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Location: Cannock		Hi all,
Just done some track time at the weekend and been told that my yokohama A-0048 soft compound are rolling over on the front when cornering ... just wondered if anyone has experienced this also and can recommend changes to reduce it as not keen on a tyre popping of at speed. Running individualused hydro with gaz adjustable 10 clicks out from soft and wheel ride height 300mm. Many thanks in advane.
DotMatrix
Posted 29/8/2016 10:30 AM (#722638 - in reply to #722635)
Subject: RE: Tyre roll.


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Location: Jelling, Denmark		what tyre pressure do you have in the tyres?
Tracktro
Posted 29/8/2016 10:44 AM (#722639 - in reply to #722635)
Subject: RE: Tyre roll.
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Location: Meuspath		What size? What tyre pressure? How much camber you running?
qedrat
Posted 29/8/2016 12:44 PM (#722640 - in reply to #722638)
Subject: RE: Tyre roll.
Member

Posts: 66
2525
Location: Cannock		Pressures are 26 front 28 rear cold so hot are 30/30 recommended by yokohama UK when I rang them
qedrat
Posted 29/8/2016 12:47 PM (#722641 - in reply to #722639)
Subject: RE: Tyre roll.
Member

Posts: 66
2525
Location: Cannock		Camber is stock and tyre size 175/50/13 soft compound
DotMatrix
Posted 29/8/2016 1:08 PM (#722642 - in reply to #722640)
Subject: RE: Tyre roll.


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Posts: 4458
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Location: Jelling, Denmark
qedrat - 29/8/2016 1:44 PM

Pressures are 26 front 28 rear cold so hot are 30/30 recommended by yokohama UK when I rang them


I use the exact same tyres on my a-series and I use the same pressures but switched ends. I have tried lower pressures on the front as low as 24, but found that this would cause the tyres to compress to much on the outside edge when cornering hard so now I am using 28 on the front at it seems like I have wear just to the edge of the tyre which seems correct. at the back I used to run 28-30 psi but found that only the middle of the tyre would touch the road so now I use 26 psi on the rear and also this looks like the entire thread is being worn.


Edited by DotMatrix 29/8/2016 1:09 PM
qedrat
Posted 29/8/2016 1:59 PM (#722643 - in reply to #722642)
Subject: RE: Tyre roll.
Member

Posts: 66
2525
Location: Cannock		Thanks dot matriX for the pointers.. sounds like I still have to play around more with pressures more to reduce sidewall roll/compression and think as I am now pushing harder than I did at the beginning of the season the low front pressure might be the cause.

Edited by qedrat 29/8/2016 2:03 PM
Tracktro
Posted 30/8/2016 9:22 AM (#722650 - in reply to #722635)
Subject: RE: Tyre roll.
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Location: Meuspath		You need more camber at the front
t3gav
Posted 30/8/2016 10:02 AM (#722652 - in reply to #722635)
Subject: RE: Tyre roll.
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Location: Herts		I run 175/60/13's (even taller sidewalls) and don't seem to have any issues. Is this for circuit or sprint use? Surprised you only raise pressures 2psi between hot and cold. A048's are known for soft sidewalls.
qedrat
Posted 1/9/2016 10:12 PM (#722662 - in reply to #722650)
Subject: RE: Tyre roll.
Member

Posts: 66
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Location: Cannock		Thanks tracktro .. I presume you mean negative camber?

Edited by qedrat 1/9/2016 10:19 PM
qedrat
Posted 1/9/2016 10:18 PM (#722663 - in reply to #722652)
Subject: RE: Tyre roll.
Member

Posts: 66
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Location: Cannock		Hi t3gav... use the car in sprint racing so 1500 yards max hence 2 to 3 psi increase is what I get the moment. Spoke to technical depth at your hama this week and they seemed of about pressure cold and hot. They also concluded that a camber change is needed so with comments so far I think it's the first port of call... Thanks to everyone who provided input on this thread.. very much appreciated!

Edited by qedrat 1/9/2016 10:20 PM
Tracktro
Posted 5/9/2016 7:38 AM (#722676 - in reply to #722662)
Subject: RE: Tyre roll.
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Location: Meuspath
qedrat - 1/9/2016 10:12 PM

Thanks tracktro .. I presume you mean negative camber?


Yes. Add some negative camber on the front.

How are you planning on doing it?
qedrat
Posted 6/9/2016 7:02 PM (#722680 - in reply to #722676)
Subject: RE: Tyre roll.
Member

Posts: 66
2525
Location: Cannock		Hi traktro,
From what info I have.. Mgf top arms as a start then look at slotting mounts if needed seems to be the common suggestions.

Edited by qedrat 6/9/2016 7:04 PM
t3gav
Posted 7/9/2016 9:54 AM (#722685 - in reply to #722635)
Subject: RE: Tyre roll.
Elite Veteran

Posts: 664
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Location: Herts		You want the MGF lower ball joint, it will give you a bit more castor and more -ve camber. -1 to -1.5 degrees approx. after fitting.
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