Kumho V70a tyres - how much camber angle ?
Discussion
Hi DCL,
Very many thanks for all of that information.
Can I ask what pressures you were looking for hot please ?
Why did you find the 235 on the front too big please ? Difficult to get heat into them ?
I am guessing that you ran 175 on the front ? If so was that with 215 or 235 on the rear please ?
Very many thanks for all of that information.
Can I ask what pressures you were looking for hot please ?
Why did you find the 235 on the front too big please ? Difficult to get heat into them ?
I am guessing that you ran 175 on the front ? If so was that with 215 or 235 on the rear please ?
215 front 235 rear for me and for a lot of the sprint/hill-climb competitors. The extra width seems to be better under braking. Cold pressures about 16psi which should get to around 21/22psi hot. In most hill-climbs you won't get to that though. I ran the same set up for a few circuit races at Brands and it worked well for those as well. I've got the front camber set to around 2.5deg and the rear at the standard 1.5 - others run less front camber.
Sprint car:
My normal set-up is super-soft 215, or 235 (very little difference between them, perhaps the 235 is better in the warm and dry conditions), and the 175 soft on the front. The 175 on 6 inch rims are lighter and helps the un-sprung weight. That is very noticeable on the Caterham and keeps the tyres on the ground, and less drag too. But it's a personal preference rather than anything else - my thinking is if you can get a 175 to do the job then it is pointless going wider. I usually run 16 psi rear 15 psi front, but will go down to 12 if conditions are right.
For longer track sessions, the soft compound works well too. I've no experience of medium and hard compounds.
Here's BTCC driver, Rory Butcher pushing the Kumhos to the limit at Knochhill with the set-up as above. Certainly no understeer, despite the smaller front tyres. https://youtu.be/Qglr6TJ9Wr0
My normal set-up is super-soft 215, or 235 (very little difference between them, perhaps the 235 is better in the warm and dry conditions), and the 175 soft on the front. The 175 on 6 inch rims are lighter and helps the un-sprung weight. That is very noticeable on the Caterham and keeps the tyres on the ground, and less drag too. But it's a personal preference rather than anything else - my thinking is if you can get a 175 to do the job then it is pointless going wider. I usually run 16 psi rear 15 psi front, but will go down to 12 if conditions are right.
For longer track sessions, the soft compound works well too. I've no experience of medium and hard compounds.
Here's BTCC driver, Rory Butcher pushing the Kumhos to the limit at Knochhill with the set-up as above. Certainly no understeer, despite the smaller front tyres. https://youtu.be/Qglr6TJ9Wr0
Definately 215/235 gives better braking performance. Increase of .35g all data logged against 175 front or even 185/215 ZZR set up.
As Shaun says 16psi cold. I did a season trying to make them work at lower pressures down to 12 and although nothing bad happened it wasn't until the end of the year and I reverted back to 16 that I suddenly found the car on its toes again. Felt a little dead at lower pressures.
Where I differ from Shaun is that I began running the front tyre more and more upright until I got even temps across the tyre.
I ended up with .75 neg camber on the 215. No that's due to the way we added the tyre width over the regular 175 to the outer rim. So the outer edge of the tyre could clearly see daylight underneath.
There is no gain in cornering force between the 175/215 front as once on power it's not an issue.
Its just contact patch under braking where the gain is.
As Shaun says 16psi cold. I did a season trying to make them work at lower pressures down to 12 and although nothing bad happened it wasn't until the end of the year and I reverted back to 16 that I suddenly found the car on its toes again. Felt a little dead at lower pressures.
Where I differ from Shaun is that I began running the front tyre more and more upright until I got even temps across the tyre.
I ended up with .75 neg camber on the 215. No that's due to the way we added the tyre width over the regular 175 to the outer rim. So the outer edge of the tyre could clearly see daylight underneath.
There is no gain in cornering force between the 175/215 front as once on power it's not an issue.
Its just contact patch under braking where the gain is.
In relation to this, although I have an S3 chassis and therefore Dedion rear, I would be very interested to hear from any CSR owners running the Kumho's as to what cambers you have found work best for both front and rear please ? ie the CSR having the "luxury" of more options easily available for rear camber settings.
Many thanks in advance for all assistance & advice.
Many thanks in advance for all assistance & advice.
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