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Author: Subject: tyre pressures
rash12

posted on 4/5/16 at 12:55 PM Reply With Quote
tyre pressures

what tyre pressures are people running on thier 7 type cars please?
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mackei23b

posted on 4/5/16 at 01:18 PM Reply With Quote
OK, I'll start - I've run at 18psi for the Caterham and Westfield running on iether 185x60x13 or 205x60x13, I know some that run as low as 16psi though these are race cars - all cold pressures

[Edited on 4/5/16 by mackei23b]

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CosKev3

posted on 4/5/16 at 01:22 PM Reply With Quote
I'm running 18psi too in 195/55 15 NS2-R'S.

Seems to be spot on for road and did some twenty minute sessions at Oulton Park and they were good on there too

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ian locostzx9rc2

posted on 4/5/16 at 02:08 PM Reply With Quote
My striker is 16psi
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David Jenkins

posted on 4/5/16 at 03:28 PM Reply With Quote
I generally run 18psi front and back, although I have also had 20psi front and 18psi back (60% of the weight is at the front). I think I prefer 18psi all round.

This is on a 600kg car.






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daniel mason

posted on 4/5/16 at 04:27 PM Reply With Quote
I run 14 - 15 psi in my Jedi.
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Bluemoon

posted on 4/5/16 at 05:20 PM Reply With Quote
Real answered is to adjust to get the correct contact patch... but 18psi is not a bad starting point.
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sprintB+

posted on 4/5/16 at 07:40 PM Reply With Quote
I have been up and down the pressure range, but after taking advice from fellow Duttoneers settled at 18 psi. some are at 15psi but I did bottle it a bit at such low pressure on old RS alloys. Afraid they may roll the tyre.
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David Jenkins

posted on 4/5/16 at 08:02 PM Reply With Quote
quote:
Originally posted by Bluemoon
Real answered is to adjust to get the correct contact patch... but 18psi is not a bad starting point.


I used a remote IR thermometer to measure the temps across my tyres after an enthusiastic drive - 18psi gave reasonably even results.






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rusty nuts

posted on 4/5/16 at 08:15 PM Reply With Quote
Procomp recommended 25psi when I had my car set up.
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David Jenkins

posted on 5/5/16 at 06:54 AM Reply With Quote
I found that mine was too skittish when I went up to 20-something all round - but that might be a sign that the rest of my suspension needs attention!






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Chris_Xtreme

posted on 5/5/16 at 09:52 AM Reply With Quote
I run at 14psi

Toyo Proxes R1R 195/50 R15

slightly larger 7 style car.

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johnemms

posted on 5/5/16 at 10:47 AM Reply With Quote
I get nice even Tyre wear at 16/17 psi cold - but have to work them to get some warmth in them and sticky asap 185/70/13 Yokohama A021 -

I tried 20's but far too hard and wore heavy in the middle ..

[Edited on 5/5/16 by johnemms]





Own chassis & Build - First time pass!!
"7's" aren't really "cars", they are 'experiences"

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David Jenkins

posted on 5/5/16 at 01:20 PM Reply With Quote
johnemms - you have similar tyres to mine - I wonder if the higher profile makes it easier to use lower pressures?






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rash12

posted on 6/5/16 at 08:19 PM Reply With Quote
thanks for all the replies i will try at 18psi
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