Tyre pressures

Tyre pressures

Make sure you buy a tyre pressure gauge of your own, who knows when the last time the air pump at the garage was calibrated.

Buying your own gauge will insure you get similar readings.

Please enter all readings as COLD for Road and HOT for Track

Please beware that tyre pressure is part of your suspension setup and the pressure numbers from the manual is a good start if you run factory geo and OE tyres. Anything else is trial and error.

That said starting at the low end will help you find the correct pressure faster.

As used by other SELOC members:

Elise S1	FRONT	REAR	SIZE	Road or Track?	Used by
Toyo R888	22	24		Road
Yokohama Advan Neova LTS	22	24		Road
Yokohama Advan Neova LTS	20	22		Road	Mr Wiki in the Summer
Yokohama Advan Neova LTS	22	24		Road	Mr Wiki in the winter
Yokohama Advan A048r (M)	23	24	195/255	Road	sc-009
Yokohama Advan A048	27	28		Track
Toyo Proxies T1R	24	26		Road
BF Goodrich G Force Profilers	22	24		Road
Yoko C Drive	22	24		Road
R888	19	21		Road
Kumho Ecsta KU31	24	26		Road
Kumho Ecsta KU31	23	24	195/225	Road (Wet)	sc-009
Kumho Ecsta KU31	26	26	195/225	Track	sc-009
Kumho Ecsta KU31	23	25	195/225	Road	sida
Kumho Ecsta KU31	26	28	195/225	Track	sida
Hankook RS2	24	26	195/225	Road	ReVolt

The Elise manual says 26F/27.5R for Bridgestones on a K series but this may be too high with rear centre tread wearing first.

Elise S2 K series	FRONT	REAR	Road or Track?	Used by
Yoko AD07	22	24	Road & Track
Bridgestones	24	26	Road
Bridgestones	26	27.5	Road (and no abnormal centre wear at all)
Bridgestones	24	26	Track
Yoko AD07	23	25	Road
Toyo R888	22	24	Road
Toyo R888	20	22	Track
Yoko AO48	22	24	Road
Dunlop SP9000	24	26	Road

The Elise manual says 26F/29R for Bridgestones on a Toyota-engined Elise Standard 111R

Elise S2 Toyota	FRONT	REAR	Road or Track?	Used by
Yokohama AD07	23	25	Road
Yokohama A048	22	24	Road
Tyre Name	PSI	PSI	?
Tyre Name	PSI	PSI	?
Tyre Name	PSI	PSI	?
Tyre Name	PSI	PSI	?
Tyre Name	PSI	PSI	?

Exige S2 Toyota	FRONT	REAR	Road or Track?	Used by
Yokohama A048	22	24	Track
Yokohama A048	24	26	Road
Toyo T1-R	26	28	Road

Europa	FRONT	REAR	Road or Track?
Tyre Name	PSI	PSI	?
Tyre Name	PSI	PSI	?
Tyre Name	PSI	PSI	?

Toyo 888 Tyre Pressures

Extracted from the following thread:

http://forums.seloc.org/viewthread.php?tid=222602

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