im pretty new to exige ownership,so still learning, i am just wondering what tyre pressure most of you run on trackdays? I am running A048s on my s2, i know alot of it depends on track temp/weather e.t.c but “generally speaking” what pressure to you run? I dropped the fronts down a few psi, and this improved understeer alot!
any advice/tips appreciated.
cheers
As a guide, go for 27 or 28 psi all round when hot!
As a guide, go for 27 or 28 psi all round when hot!
cheers pesky, is that front and back the same?
cheers pesky, is that front and back the same?
Yep, as in “all round”
cheers pesky, is that front and back the same?
Yep, as in “all round”
oops…my bad
I use 23F25R and still wear the middles out first.
I use 23F25R and still wear the middles out first.
On track (& hot), Neil?
On the road, I find that with 20F 22R when cold, I get even wear.
Crickey!
The Owner’s Manual has them up at 30 something!!!
I use 23F25R and still wear the middles out first.
On track (& hot), Neil?
On the road, I find that with 20F 22R when cold, I get even wear.
Hot and cold, track and road. The middles only just wear out first. Maybe my pressure gauge is duff, but seems to work ok for me.
Crickey!
The Owner’s Manual has them up at 30 something!!!
Really? The S1 manual says 23F 26R cold, but with those pressures the middles wear much quicker, hence my post above.
I suppose it just goes to show that peeps need to experiment with the pressures on their cars
I’ve been running mine at 25 all round when hot.
Crickey!
The Owner’s Manual has them up at 30 something!!!
Wasn’t there a discussion in USA where they wearing out the middle as the manual had tire (sic) pressures too high ?
I’m really not in a position to offer any great experience but I’m running 26 rear 24 front (cold) and tyre wear was millimetre even on a Walshy day last week.
I use 28 hot all round on track, which is give or take 22f 23r when cold I am using 48’s tho
I was doing a track day at Bedford Autodrome the other week and asked the tyre guy at the end of the pit road to check my pressures after 3 different sessions { I know but he looked bored }
He suggested 28f 30r Running on AO48 lotus tyres and Olins these pressures stayed pretty constant, when running in the dry.But I am still not convinced this is correct!!
Southport ?? - Bloody hell…will keep an eye out for you!
Its out on Thursday next week for a track day at Castle Combe on Friday. [color:“yellow”] [/color]
Copied from a similar thread on the VX220 forum. This relates to 888s but I assume applies to 048s too.
"My name is Alan Meaker, I am the Motorsport Manager for Toyo Tyres (UK) Ltd.
I was at Rockingham on the Saturday 1ST March at the LOT trackday and worked with a couple of cars using our R888 tyre regarding pressures and tread temperatures.
What I would like to do is to offer some advice on tyre temperatures and pressures and how to achieve the best from our tyres when taking part in either trackdays or racing.
The R888 has a semi race construction (very stiff) and a race tread compound. The optimum tread temperature range is between 85C and 95C measured using a probe type pyrometer, and ideally a maximum difference across the tread of 9C. The maximum hot pressure we recommend is 40psi. Camber angles up to 5 degrees are permissible but the final setting will depend on tread temperatures. It is advisable to have as much positive castor as practical as castor induces a beneficial camber change during cornering. I recommend that the tyres be put through 2 heat cycles before hard use.
The pressures you use will initially depend on the weight of the car, too little pressure on a heavy car can lead to over deflection of the tyre and subsequent failure.
Below are some basic settings:
VEHICLE WEIGHT COLD PRESSURE (HOT PRESSURE)
Very Light < 800kg 17 - 22 psi (22 - 29 psi)
Light 800kg - 1000kg 20 - 26 psi (24 - 32 psi)
Heavy 1000kg - 1400kg 23 - 27 psi (28 - 40 psi)
Very Heavy > 1400kg 27 - 35 psi (37 - 40 psi)
As a tyre gets hotter the pressure increases, this is due to the moisture in the air. The cold pressure you set to achieve a desired hot pressure will depend on the conditions on the day i.e. ambient and track temperature, wet or dry. If the day/track is cold you will need to start with a higher cold pressure as the tyre will not get as hot therefore the pressure increase will not be so great.
Hot pressures must be balanced side to side. Once the tyres have cooled you will find that you will have a difference in pressure side to side, if you have been racing on a right hand track you will find the offside pressures will usually be higher than the nearside.
Changing hot inflation pressures by small amounts can be used to fine tune handling.
Reduce Oversteer Reduce rear pressures or increase front pressures
Increase Oversteer Increase rear pressures or reduce front pressures
Reduce Understeer Reduce front pressures or increase rear pressures
Increase Understeer Increase front pressures or reduce rear pressures
Achieving the required tread temperatures will depend again on the conditions on the day i.e. ambient and track temperature, wet or dry.
You often here competitors saying �My tyres started to go of towards the end of the race�, this is usually due to the tread getting to hot.
The tread temperatures are constantly changing through out a race, hotter when cornering and cooler when on the straights and cooling even more when you are slowing to come into the pits. Therefore the temps you record in the pits will be lower than those during the race. So if you record temperatures within the range given above the probability is the temps will be too high during the race.
Increasing your tyre pressures will cause your tread temperatures to increase, more pressure stiffens the tyre�s casing which results in the tread having to do more work resulting in the tread getting hotter. Lowering your pressures will cause them to decrease.
Inevitably changing one thing will affect other things, the whole set up of your car is a compromise between anything that is adjustable.
Some of you are also asking about different compounds. Originally we only had one compound �GG� (medium hard), but we have now introduced some sizes in a �SG� (soft/wet) compound. This was done primarily for sprint/hillclimb (around 60 second runs) where the distances covered are relatively short and you need the tyres to work/heat up very quickly. This is not a compound I would recommend for race/trackday dry use as the tyres will go off very quickly.
The sizes that will be available are:
185/60R13, 205/60R13, 195/50R15, 205/50R15, 225/45R16, 225/45R17.
Another subject is the introduction of our Proxes R1R. This tyre was due to be launched at the beginning of 2008, unfortunately this has been delayed to at least mid 2008 but there is a good chance it will be latter than this. Regarding sizes, initially we will have a rear fit (225/45ZR17) but not the front (195/50R16).
I hope this is of some use to you.
If I can be of any further assistance please give me a call.
01933 414537
Best Regards
Alan."
I’m really not in a position to offer any great experience but I’m running 26 rear 24 front (cold) and tyre wear was millimetre even on a Walshy day last week.
Tony - were you at North Weald on the 12th then ?
I was !
I’m really not in a position to offer any great experience but I’m running 26 rear 24 front (cold) and tyre wear was millimetre even on a Walshy day last week.
Tony - were you at North Weald on the 12th then ?
I was !
I was there on the Monday with some of the guys of SELOC. Going back again though in the New Year.