Toyo R888 Setup Tips Essential info for track driving Track Days and Track… — Volkswagen Bora MkIV

27 мая 2015 | Author: | Комментарии к записи Toyo R888 Setup Tips Essential info for track driving Track Days and Track… — Volkswagen Bora MkIV отключены
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#1 Tabs

Posted 16 July — 03:16 PM

Found on another forum [Y]

My name is Meaker, I am the Motorsport Manager for Tyres (UK)

Ltd.

I was at on the Saturday 1st March at the LOT trackday and

with a couple of cars our R888 tyre regarding and

tread temperatures.

What I like to do is to offer some on tyre temperatures and

pressures and how to the best from our tyres taking part

in either or racing.

The R888 has a semi construction (very stiff) and a tread

compound. The optimum temperature range is between 85C and 95C

using a probe type and ideally a maximum difference

the tread of 9C. The maximum hot pressure we is 40psi.

Camber angles up to 5 are permissible but the final setting

depend on tread temperatures. It is to have as much positive

as practical as castor induces a camber change during

I recommend that the tyres be put 2 heat cycles

before use.

The pressures you use will depend on the weight of the car,

too pressure on a heavy car can lead to deflection of the

tyre and subsequent

Below are some basic

VEHICLE WEIGHT COLD HOT PRESSURE

Very Light 17 — 22 psi 22 — 29 psi

Light — 1000kg 20 — 26 psi 24 32 psi

Heavy 1000kg — 23 — 27 psi 28 — 40 psi

Very 1400kg 27 — 35 psi 37 — 40 psi

As a gets hotter the pressure this is due to the

moisture in the air. The pressure you set to achieve a desired hot

will depend on the conditions on the day ambient and track

temperature, wet or dry. If the day/track is you will need to

start a higher cold pressure as the will not get as hot

therefore the pressure will not be so great.

Hot pressures be balanced side to side. the tyres have cooled

you find that you will a difference in pressure side to

if you have been racing on a hand track you will the offside

pressures will be higher than the nearside.

hot inflation pressures by small can be used to fine

tune

Reduce Oversteer Reduce pressures or increase front

Increase Oversteer Increase pressures or reduce front

Reduce Understeer Reduce pressures or increase rear

Increase Understeer Increase pressures or reduce rear

Achieving the required tread will depend again on the

conditions on the day i.e. ambient and temperature, wet or dry.

You often competitors saying “My started to go off towards

the end of the race”, is usually due to the tread getting to

The tread temperatures are constantly through out a race,

hotter cornering and cooler when on the and cooling even

more you are slowing to come into the Therefore the temps you

record in the will be lower than during the race. So if you

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record within the range given the probability is the

temps will be too during the race.

Increasing tyre pressures will your tread temperatures to

more pressure stiffens the casing which results in the

having to do more work in the tread getting hotter.

your pressures will them to decrease.

Inevitably one thing will affect things, the whole set up

of your car is a compromise between that is adjustable.

Some of you are asking about different Originally we

only had one compound (medium hard), but we have now

some sizes in a ‘SG’ compound. This was done for

sprint/hillclimb (around 60 second where the distances covered are

short and you need the tyres to up very quickly.

This is not a I would recommend for race/trackday dry use as

the will go off very quickly.

The that will be available

185/60R13, 205/60R13, 195/50R15, 225/45R16, 225/45R17.

Another is the introduction of our Proxes R1R. tyre was due

to be launched at the beginning of unfortunately this has been

to at least mid 2008 but there is a chance it will be

latter this. Regarding sizes, we will have a rear fit

but not the front (195/50R16).

I hope this is of some use to

We’ve run our used 888’s at two now. First time at the and the second at anglesey — tracks couldn’t have more different in terms of required for the tyres!

The ring, for us, litle wear on the tread and marginal increases in pressure. a cold pressure of 29psi, to 32psi after a lap dropping the by 1-2 psi all round helped. Maybe we trying hard enough

Anglesey, on the other hand, saw a lot heat and increase in pressure to so much that the front tyre had excessive wear on the of its tread (lots of right We saw pressures nearing 35 psi (hot) but adjust. Lesson learned constantly check pressures each session, adjusting down to around 30-31psi. Do let the warn up in your first (i.e. don’t go out and cane like I did).


Castle combe is next for us and be keen to try and keep a stable setup, possibly adjusting the a little lower than the to offset undertseer.

If you have any of 888’s or any other track for that matter please — very interested in your advice / experience [Y]

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