deano

Hi Guys,

I am using the OEM bridgestone tyres - can anyone suggest a good tyre pressure for doing Hill Climb or short Sprint work?

I am thinking 30psi all around - I have had a search on the forums but can't find any good information.

Thanks,


Deano.

xxup

36 PSI COLD... That right Taka???

deano

Wouldn't the increased pressure give me less grip?

I am only doing 1.2km sprints with no tyre warm up.

MACCAA

At the Nats last year we found 36lb HOT was about right.This translates to around 30lb cold.
Cheers
Len

Revolver

And don't forget to have a quick check of the pressure immediately after each run (right Len?).

takahashi

Agree with MACCAA,

but with shorter climb you might want to have around 37or 38. I have 34psi hot with my slick at Winton!

deano

Hi Taka - its hard to compare a slick to the oem bridgestone though.

I'm going to start at 30PSI - I will do one run at 36PSI as an experiment once I am up to speed - will post the results.

takahashi

I use to track my OEM bridgestone at Sandown.

Syd is a bit warm today and warmer in Qld?

36 hot is the lowest you go. The lower the pressure - the more heat you generate - so don't need that low pressure! I think 36 hot is good starting point - do you have a pump if you need more?

deano

Hi Taka - remember I am only doing 1.2km - thats the equilivant of what, 1/3rd of a lap at Sandown? - zero warm up, and full speed right from the start.

Do you still reckon start with 36 ?

I need maximum grip - the tyres will generate very little heat over that distance even at full speed.

takahashi

I suggest to have 34psi cold at least if not 36 cold to start with

Measure the tyre pressure after 1st run. I suspect it will go above 40psi. Drop it down to 38 psi HOT and try again. Drop further if you like after 2nd run.

deano

Hey guys,

I thought I'd post my results.

The quickest time was from 28psi all round. I would consider trying 26psi but am a little worried about the tyre rolling onto the side wall. At 28psi with the hardest cornering you could imagine - no marks on the side wall so tyre roll is hot a problem at that pressure with the OEM bridgestones.

I did a run at 36psi and another at 40psi - it was traction control city. Sure the car started to turn really easy - but I had zero grip.

28psi gave far better grip levels and resulted in a lot less work from the traction control system.

Everyone at the hill climb was very impressed by the RX8 launches - 6000rpm seemed to yeild the best results.

5 of us got to take some CAMS officials for a hot lap after the event which let me do a launch from 9000rpm on the rev limited. Smoked both tyres for about 200 metres - felt awesome and also a crowd pleaser.


Bring on the turbo!!

Deano.

Revolver

Woohoo! - not sure I'd be game to drop the clutch at 9K.

Glad to see you're having lotsa fun.

deano

I kind of slip it for a second then let it out - its all good.

timbo

Hmmm....is that the stock clutch?

deano

Yes - no slippage at all.

Revolver

...yet!

deano

oh well - better the clutch than the gearbox :-)

Revolver

Correct!