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Author Subject: R888 setup advice from Toyo UK
farmer

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Location: Southend On Sea

Registered: 20 Aug 2005

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Post #1
Thought this may be usefull to a few people on here.

Pinched from Pistonheads btw.

quote:
SET UP ADVICE FOR THE TOYO PROXES R888

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 a heat cycle before hard use, this will scrub them in and remove any mold release agent.

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

________________________________________

Long live the Sigma 6 Big grin
Team Phase 1 supercharged

XBL ID: farmer uk1
Posted 31st Dec 2009 at 21:16
lotek

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Location: Berkshire

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Post #2
FAQ ?

Looks like i need me some positive caster for summer. Ninja
Posted 31st Dec 2009 at 21:29
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #3
judging my those R888's that were on the C5 wheels I'd say you need to remember to check the temps and pressures more often especially the nearside front wheel Lotek Razz

adding castor to a 306 is quite difficult, adjustable top mounts and smaller diameter springs will help.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 31st Dec 2009 at 21:31
lotek

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Post #4
LOL
Posted 31st Dec 2009 at 21:33
crf450

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Registered: 23 Mar 2005

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Post #5
As I've just been researching how much caster I should run on my race car, that's all very interesting.

________________________________________


Quote "da g man!"
"You've only got to watch the "306 vs ringtaxi" video & you soon realise how good these mod's are! That guy is running Ash's 30mm ARB, Solid Mounts & 23mm Torsion Bars & some adjustments on the camber. Admittedly, the guy is an awesome driver, but it just go's to show how well these cars can handle with the right modification's
Posted 31st Dec 2009 at 23:20
farmer

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Location: Southend On Sea

Registered: 20 Aug 2005

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Post #6
Glad it was of use!

O/T happy birthday Martin!

________________________________________

Long live the Sigma 6 Big grin
Team Phase 1 supercharged

XBL ID: farmer uk1
Posted 31st Dec 2009 at 23:30

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