13 replies to this topic

[cradley-heathen]

weather permitting im off to castle combe this weekend, and despite having had a little play with tyre pressures before, i cant honestly say what i found to be the best?

any suggestions?

im running a008 yokos, on 6x10s.

[racingbob]

in hisotric back in the 90's we used falcons

and had to run lots of camber 3 deg

and tyres were upto 39 f 36 r

[cradley-heathen]

im running 2 degress on the front, i was under the impression i needed to drop the pressures to be honest, the harder i ran the tyres, the more wheel spin i get exiting corners. i think i need an lsd!

[Artful Dodger]

racingbob is that cold tyre pressure or hot tyre pressure?

[bmcecosse]

I would agree - start at 40 psi all round then adjust to suit your needs.

[Cater_Racer]

I think BMCEcosse is correct in starting with slightly higher pressures, the risk with A008's are quite soft and you can easily roll them off the rims in the first few laps. (It's not always easy to do steady warm up laps, when everyone around you is showing how skilled they are at circuit driving) . After three laps come in and reduce the pressures to 38 f 36r hot. Check again after the next session.

I used to go out with 14psi in the Caterham on A032R's during qualifying (they ended up at 22psi), but most race drivers like to put 3 steady laps in before they get going, due to MSA regs.

[racingbob]

I would agree - start at 40 psi all round then adjust to suit your needs.

What a load of rubbish, you need to run less pressure, as tires warm up the pressure increases...............

i take it you know by experience

i raced historic for 4 years in a full race cooper s in AUS

we had to run the tryes hard as i say 39f 36 b cold, ( everyone did ) ordinary falcons

they went up about 4 lb when hot, the tyres we used to get taken down

to 2 mm tread to help road holding. we then later were allowed to us

later we were allowed to use hoosiers 26f 24b great tyres

heres the car with the falcons on with 3 deg camber as well

everyone ran like this

[Ben1400]

I haven't run A008s on the track but use them for road tyres. I do use 10" Avon CR6ZZ tyres on the Sprint/Hill Climb track and have in the past used 10" A032Rs & 13" A048rs. I use 24 psi all round for the Avons & 26 psi for the 32s. I suggest the A032rs have similar side wall strength to A008s so I would try 26 psi for your A008s. Don't forget to set them cold!

Regards,
Barry

Edited by Ben1400, 25 April 2012 - 09:22 AM.

[racingbob]

if i can recall the a008 were the same running high like falcons

but when i started the aoo8 and dunlop were banned

and we could only use the falcon , after a couple seasons. people were complainig about the falcons

they brought in the hoosiers. i did get some avons to try from the UK, they were a bit of a handful

and they were run lot less pressure. but were to soft for AUS

hoosiers wernt to bad in the wet either

[racingbob]

mine were 4 deg more on the from at bit less if i can recall on back

after 10 laps. this was back in the late 90's when living in AUS

they were 42 - 43 on the front, this was on 5" rim and hot weather

[Artful Dodger]

we race quite a lot or caterhams and we have about 18 PSI in our dry tyres, which raises to about 22 when they warm up. why do minis run with such high pressures??

[Spud_133]

I run about 22 all round on sierra, running. A021R's, so i'd 008's a bit harder as they're not as soft, maybe about 26-28psi

[R1minimagic]

Tyre pressure is a personal preference as it can affect understeer vs oversteer quite dramatically. There is no right or wrong answer.

I would start a few psi less than normal road pressure and keep increasing in 2psi intervals, do a few laps each time, you will soon see the difference

How long your tyres last is also another consideration vs the above!!

[racingbob]

in the old mini 7 days i used 45 f 40 b

on those race dunlops like a star pattern on the tyre

think they CR70