Toyo R888

[lukits01]

OEM STI's were RE070's, MY08 STI's have changed to dunlops, i will check tomorrow for what model

I tried the RE070 (FD2R, NA2R, STi OEM tire) in same size as my RE55S
they were just over 1 sec slower in a 1minute lap
could be me improving my driving
but the RE070 felt really good
impressive street tires

[m0nty]

If budget allows I'd go for an RE55S or A048/50. These tyres cost a bit more but are alot grippier. The only downside is the warm up times. RE55s can sometimes take up to 2 laps to get up to temperature. Not sure on heat cycles but after just 2 days and 10 sessions in my car they were starting to get a little hard. They'd hang in for well over 15 laps though. I ran out of brakes well and truly before the tyres went off.

Not for the faint hearted when it comes to the hip pocket, but that's the price of speed I guess.

[Zilli]

hmmmmmm....... well it sounds as though theyre a good choice as a compromise. im really looking for a great quality tyre that i can run on the street that will also doagood job on the track and strip. can someone tell me alittle more about "GOING OFF" and "HEAT CYCLES". sorry about the noobness

[m0nty]

hmmmmmm....... well it sounds as though theyre a good choice as a compromise. im really looking for a great quality tyre that i can run on the street that will also doagood job on the track and strip. can someone tell me alittle more about "GOING OFF" and "HEAT CYCLES". sorry about the noobness

Semi slick tyres require higher than normal heat to work effectively. Ever seen a race car spin out on a warm up lap? It's very VERY easy to do. It's like driving around on Maccas trays. The weaving you see from race cars in a warm up lap is extremely important in getting tyres up to optimum temperature ASAP. There is also a maximum number of times these tyres can be heated. After the estimated number of heat cycles the tyres lose their grip properties. Kind of like heating a slice of pizza in the microwave over and over. Eventually it just goes hard.

"Going off" is when a tyre exceeds it's optimal temperature and becomes mushy. I've only experienced it a couple of times but you just start to feel as though the car is losing grip. Push harder and the tyres simply give up. Just imagine heating rubber to a limit where it's sticky to touch, then heat it further to the point where it melts and it becomes a liquid. It's the same concept here.

[Zilli]

thanks a lot for that explanation mate. so how many heat cycles will the 888s take? and at what point is a drive considred a heat cycle?

isuppose what im trying to get at is does normal street driving constitute a heat cycle?

[m0nty]

thanks a lot for that explanation mate. so how many heat cycles will the 888s take? and at what point is a drive considred a heat cycle?

isuppose what im trying to get at is does normal street driving constitute a heat cycle?

Tread Temperatures

As for most motor sport tyres, Toyo motor sport radials can be slippery when cold. Caution needs to be exercised until the tyres have had some time to warm-up. For the Proxes RA1 tread compound and the Proxes R888 & Proxes RS1 "GG" tread compound, grip levels will be low when the tread temperature is less than 55 degrees Celsius.

Optimum operating temperatures for the Proxes RA1 tread compound and the Proxes R888 & Proxes RS1 (slick) "GG" tread compound is between 75 and 95 degrees Celsius. Over 100 degrees Celsius, grip levels drop-off rapidly.

Rim widths and tyre performance

Toyo motor sport radials will provide optimum performance where the rim size allows the sidewall to have little or no protrusion from the rim flange.

Each Toyo motor sport radial product information page includes a link to download a PDF file that quotes dimensional information, including approved rim widths. Where possible, use of minimum rim widths should be avoided. For most sizes, optimum tyre performance will be provided with rim widths that are from the mid point to the maximum in the range of approved rim widths shown.

Tread Compounds

Proxes RA1: Available in one tread compound only for all sizes. NOTE: Late production Proxes RA1s will have a UTQG Treadwear Rating of 100. Older Production Proxes RA1s will have UTQG Treadwear Ratings of either 50 or 40, depending on the tyre size. The Proxes RA1 was re-tested, and due to changes with the UTQG testing procedures, Proxes RA1s will now have a UTQG Treadwear Rating of 100. There has been no change of tread compound for the Proxes RA1.

Proxes R888: All Proxes R888 tyres held in stock are "GG" tread compound. The "GG" is a versatile tread compound, suitable for a wide range of applications.

The Proxes R888 is available with the "GGG" tread compound in a small range of sizes from Toyo motor sport dealers by indent order only. No "GGG" tyres are kept in stock due to a short shelf life of this tread compound. The "GGG" tread compound is suitable for a narrow range of applications only, and has a much faster wear rate compared to the "GG" compound.

The tread compound of each Toyo Proxes R888 tyre is marked on the sidewall.

Proxes RS1: All Proxes RS1 tyres use the same "GG" compound as used on the Proxes R888.

Proxes RR1: All Proxes RR1 tyres use the "SG" tread compound. This is a very soft compound that is suitable for use in on wet tarmac only. The shelf life of the "SG" tread compound is very short.

Please contact your Toyo motor sport dealer for Toyo Technical Department for information regarding suitability of tread compounds for specific applications.

Street use

The Toyo Proxes RA1, Proxes R888 & Trampio R8881 are legal for use on public roads but recommended for competition or use on closed circuits. Grooved, street legal race tyres are designed for users who need to drive their vehicle to and from the circuit, and / or where the class regulations specify that street legal tyres must be used.

When compared to high performance or ultra-high performance tyres, when used on public roads, Toyo motor sport radials will:

1. have comparatively poor ride comfort. Toyo motor sport radials have a steel sidewall ply to minimise sidewall deflection for optimum cornering grip.

2. be susceptible to "tram-lining" / "tracking". The casing stiffness provided by the steel sidewall ply and wide belt packages used on Toyo motor sport radials make them susceptible to tram-lining caused by road irregularities common on public roads.

3. have faster tread wear. The tread compounds used on Toyo motor sport radials provide much higher grip levels compared to high performance or ultra-high performance tyres rather than long tread life.

4. be slippery when cold. Due to the tread compounds & construction types, grip levels will be low until the tyres have had some warming-up. This will be especially noticeable in cold and / or rainy conditions.

5. be susceptible to aquaplaning when used with low tread depths (3 -1.5mm) on wet roads, especially in heavy rain conditions. Users need to exercise caution in these conditions with careful monitoring of vehicle speed to avoid aquaplaning. The Proxes RA1 pattern is the exception. The Proxes RA1 has a void ratio that makes it resistant to aquaplaning, where tread depths are >4.5mm. For more information on wet road grip and aquaplaning, click here.

All Information Taken From toyo.com.au

[Zilli]

thank you Monty....

shame there's no info on heat cycles... and how many before the tyres go hard...

anyway, i think i will try them out, i did some calculations yesterday and im lucky to put 500kms a month on it so the wear rating shouldnt matter too much

[tinkerbell]

how many heat cycles = how long is a piece of string?

[Zilli]

fair enoguh Dave, so there is no definite number of times, it just depends...

[tinkerbell]

my 888's lasted the whole supersprint season, but that was only doing 4 laps per session, 6 sessions per even, 8 events in teh year...

i also did a few circiut club days before that... i bought the tyres in April 2006.

my records show that those tyres did 261 'timed laps' in the period from April 2006 to October 2007.

and my times were still improving at each successive event - even though the tyres had gone 'hardish' - they had the rainbow sheen to them and a few flatspots.

so in this sense, the tyres were not the limiting factor to my times, but the driver... so you really need to be a 'gun' driver - who is consistent to withing a few tenths of a second to actually notice a huge difference once tyres "go off"

however - i will say that the RE55's improved my lap time at eastern creek by a few tenths despite being in a lower power 'tune' that took about 7km//h off my VMAX...

[Zilli]

did you use them on the street mate?

[tinkerbell]

no.

[Zilli]

ok... i suppose i'll wait for Howie, i think he did use them on the street

[tinkerbell]

what do you need to know?

[m0nty]

Just keep them for track days. You'll get better life out of them and keep road going tyres for daily driving. Both are better suited to your needs then.