Toffee

iTrader: (3)

I have just done my first trackday at Oulton Park and Elvinton handling track this week and my normal road tyres just arent up to it, so I am looking at getting a set of track day tyres, any advice?

I am looking at these tyres at present "YOKOHAMA A048 R ADVAN " can anyone advise where to get a pair (just fronts) of these from cheap?

I have also looked at the R888s but I have told that these are just too soft?

Cheers,
Lee.

dunx

iTrader: (3)

Elvington's concrete is hugely abrasive.

R888's are the sprinters choice, a harder compound may last longer if you are out all day.

Bez was great entertainment after a shower this afternoon

dunx

Paul C

iTrader: (12)

are these road legal like the r888?

cheers paul

dunx

iTrader: (3)

They are all supposed to be on the list for becoming non-road legal, if the EU get their way...

dunx

Toffee

iTrader: (3)

I was thinking of getting a couple of extra wheels to put the "trackday" tyres on, so at a push they dont need to be road legal

I have seen the R888s advertised at £194 per tyre !!!!!!!!!!!! surely these can be had for a lot cheaper??

apac

iTrader: (2)

you'd be very lucky to get 888's for under 160 each. try phoning camskill. R888's come in different compounds. The medium compound would be best to choose for any kind of longevity, they are awesome if doing short track day bursts..

on the cheaper side you have Hankook RS2 which are about 100 quid each. Or Bridgestone Potenza RE070 although these take a while to warm up but good for long runs, they have a very very stiff sidewall

Moley

iTrader: (9)

*cough* https://www.scoobynet.com/private-fo...-8-alloys.html

Toffee

iTrader: (3)

I will be looking for some 235/40/18s fella, thanks though

fmp

iTrader: (7)

Generally Yoko A048R's are more expensive than 888's, as they are a better tyre.

Toffee

iTrader: (3)

Makes sense, I was at Grudgement day on Sunday and noticed that 80% were wearing Yoko's

Thanks for the feedback chaps, I have recieved a quotation from Camskill which was more like it

Paul C

iTrader: (12)

are both tyres road legal?

cheers paul

Shaun

888's are fine for something like Elvington for what is a budget track tyre in reality, but not so great for proper track action as they can tend to overheat quite quickly. You just need to be aware of this and cool them down and watch tyre pressures. I have always used 888's for sprint and track stuff though and they were fine on the Spec C.

For Elvington sprints you want something as soft as your pocket will allow as you will struggle to get heat in them otherwise for these short sprints.

A lot of tyre scrub / abuse can be down to geometry and driving style. The idea is to be smooth and the tyres will then treat you well in my view.

At the end of the day you pay for what you get!

shonner

iTrader: (2)

Hi ,have you thought of these
http://www.camskill.co.uk/products.p...m12b0s665p9716
i hill climb on the soft v70a next best thing to a slick, for track day's i think you would need med compound, these are road legal at the moment.

Shonner

fmp

iTrader: (7)

at the moment yes!

Godspeed Brakes

iTrader: (259)

I have about 30 brand new 18" Kumho moulded rally tyres for sale if anyone is interested in these , I want £90 each for them , the size is 220 / 640 / 18 , they fitted fine under my standard arched Type R impreza



Cheers Ian

Godspeed Brakes

iTrader: (259)

These are them fitted on 7.5" x 18" inovite alloys

Toffee

iTrader: (3)

Could you guys also indicate what cold psi you run at the likes of Elvington or at a trackday at somewhere like Oulton/Donington?

D1CCY

Transcript from an old Toyo article for the R888, now seems to have disappeared from their website. Would suggest about 30psi all round as a start point for a heavy car such as a new age scoob.

TOYO R888

Optimisation of motor sport radial tyre performance.

Cold inflation pressures:

Optimum cold inflation pressures are chosen to achieve optimum hot inflation pressures.

Optimum cold inflation pressures are determined by: 1. event distance and, 2. Vehicle weight and, 3. camber settings.
Pressures shown below are for inflation with compressed air.

Event Distance – Dry Tarmac
Vehicle Weight 4 laps or more Very short – Hillclimbs or <3 laps
Very light < 800kg 17 - 22 psi 20 - 26 psi
Light 800kg – 1000kg 20 – 26 psi 21 – 28 psi
Heavy 1000kg – 1400kg 23 – 27 psi 26 - 32 psi
Very Heavy > 1400kg 27 – 35 psi 31 – 38 psi


Hot inflation pressures:

Hot inflation pressures indicate the suitability of the cold inflation pressures. Where hot pressures are too low start with a higher cold inflation pressure or vice versa.
Pressures shown below are for inflation with compressed air.

Vehicle Weight Optimum hot inflation pressures
Very light < 800kg 22 - 29 psi
Light 800kg – 1000kg 24 – 32 psi
Heavy 1000kg – 1400kg 28 - 40 psi
Very Heavy > 1400kg 37 – 42 psi


Hot inflation pressures guide:

The hot inflation pressures shown above have a large range. This takes into account the variances in vehicle weight within the ranges shown, as well as axle weights, for example: a front engine, rear wheel drive vehicle with a front weight bias will usually give best results with hot pressures that are 2-4 psi higher on the front azle compared to the rear axle.


Changing hot inflation pressures by small amounts (1-4 psi) can be used to fine tune handling:

Reduce oversteer Reduce rear axle hot inflation pressure
Increase oversteer Increase rear axle hot inflation pressure
Reduce understeer Reduce front axle hot inflation pressure
Increase understeer Increase front axle hot inflation pressure

Changing hot inflation pressures to change handling bias should be used for fine tuning only. Improving overall grip levels should be done by tuning spring rates, sway bars, suspension geometry etc., using lap times and pyrometer readings to assess changes.

Hot inflation pressure note: Tyres with full tread depths used on dry tracks will have more tread flex and therefore more heat build up compared to tyres with reduced tread depths. One result of this heat build up is slightly increased pressure build up. The amount of pressure build up will decrease as tread depth decreases.

Hot & cold inflation pressures for Proxes RA1 & Proxes R888: Due to a casing construction that has less sidewall deflection compared to the Proxes RA1 the Proxes R888 will provide optimum performance with hot and cold inflation pressures which are 2-4 psi lower compared to the Proxes RA1 under the same conditions.


Using Nitrogen compared to compressed air for tyre inflation:

Nitrogen behaves quite differently compared to normal compressed air when used to inflate tyres. When subjected to heat, compressed air will expand at a greater rate compared to nitrogen. For this reason, all factors being equal, there will be less pressure build up when nitrogen is used for tyre inflation compared to normal compressed air. For this reason cold inflation pressures should be higher when using nitrogen inflation compared to using compressed air.

The advantage of using nitrogen compared to compressed air is that cold inflation pressures are closer to optimum hot pressures. Steering feel and response will be superior with higher inflation pressures for the first 2-3 laps compared to using the lower inflation pressures suitable when using compressed air. Nitrogen inflation also provides less variance in inflation pressures, therefore more consistent tyre performance and steering response.

A good rule of thumb to determine the optimum cold inflation pressures for nitrogen inflation: 1. determine the usual amount of pressure build up that occurs using compressed air, 2. halve that amount, and 3. add the amount from step 2 to the cold inflation pressure used for compressed air. NB When using nitrogen for tyre inflation ensure tyres are purged of compressed air and moisture otherwise the advantages of nitrogen inflation will not be realised.

Wet conditions and inflation pressures:

For wet tracks (standing water) increase pressures by 4-10 psi compared to dry track pressures. Increasing the pressure for wet tracks makes the tyre’s contact patch smaller, making the tyre less susceptible to aquaplaning.

There is less heat build up on wet tracks, therefore less pressure build up. This is another reason cold inflation pressures need to be higher than those used for dry conditions.

For optimum performance on tracks where there is standing water, tyres with new or near new tread depth will provide optimum performance where decreasing tread depth will increase susceptibility to aquaplaning.


Camber settings:

Toyo motor sport radials will provide optimum cornering grip with camber settings between –3 and -6 deg on steer axles. Where adjustment is possible negative camber on drive axles will also improve cornering grip. Optimum camber angles will provide optimum cornering grip, and therefore will be an important contributing factor for improving lap times.

Note: On some vehicles a lack of negative camber can overheat the outside tread shoulder causing grip levels to drop off suddenly and in some cases cause blistering of the outside tread shoulder. Large heavy, front engine cars are most susceptible to this type of tyre damage.


Camber settings and inflation pressures:

Where camber adjustment is limited increasing cold inflation pressures may help to prevent the outside tread shoulder from overheating. This also applies to vehicles that are used on the street as well as the track, where camber settings are a compromise for this dual purpose. Where this is the case, adding 3 - 4 psi to recommended cold and hot inflation pressures usually helps to prevent the outside tread shoulder overheating. Increasing inflation pressures to prevent the outside tread shoulder overheating is only recommended where camber adjustment is not possible and is not always effective.

Toffee

iTrader: (3)

D1CCY ^^^^^^^^^ Spot on mate thanks for that, greatly appreciated

Shaun

I used to run circa 30psi hot all round (track use) for the Spec C regardless of venue.

Toffee

iTrader: (3)

My car was in the garage yesterday having a bit of work/repairs done so I used the opportunity to seek advice regarding tyre temps > 33fr & 32rr hot temps was recommended also recieved a bit of advice on the usually ignored DCCD, I will now start playing with this as well

dj_akademix

I've got a set of A038's on my 7 racer and it's the best rubber i've used. Am considering 888's mediums for trackwork on my GB270