R888 vs Dunlop DZ03G

[Mark A S]

Thanks Trev, appreciate the input, anyone else have an opinion ????????????

cheers

[Thurbs]

Soul Reaver said:

You guys. Pressure is IRRELEVANT. Temperature is where it's at

What I means is this. The pressure guy will say my tires work best at 30 psi. Great everyone goes and sets theirs to 30 psi.

Now turn up at Silverstone for morning quali with an ambient temp of 9 degrees and see how you go! Your tires which were fine at 30 psi at Rockingham on a nice balmy day of 24 degrees are now way too cold and sliding all over the place.

To set tires correctly you must measure the temp in 3 positions (outside, middle, inner) on each tire and try by adjusting pressure to normalize it across all 3 readings and all 4 tires and to do that you need to know what the optimum tire temp is for your tires. So if Dunlop say for the Dirreza that you get optimum grip level at 40 Degress C then that is what you're aiming for on each tire.

For a 245 Direzza on an 18 inch rim a "good" hot pressure is 32 front 34 to 36 rear but when I ran that on said Silverstone day with 9 degrees ambient and damp in the air I was all over the place because the tires were still to cold so we had to up them a lot to get the heat in them.

So I now have a IR gun... the question is...

What's the magic number?

On another forum, 888's were quoted at 70 to 110 degrees Celsius.

[Soul Reaver]

Hi Thurbs

I rang Dunlop Motorsport and they said 40c to 50C max for DZ03G Dirrezas.

[Thurbs]

Soul Reaver said:

Hi Thurbs

I rang Dunlop Motorsport and they said 40c to 50C max for DZ03G Dirrezas.

Brilliant, thanks very much.

[Mansells Tash]

Thurbs said:

Soul Reaver said:

Hi Thurbs

I rang Dunlop Motorsport and they said 40c to 50C max for DZ03G Dirrezas.

Brilliant, thanks very much.

I'm not saying you're wrong, but thats incredibly low as a max temperature, high track temps alone in many countries would see you over that before you've even got going

[Soul Reaver]

I can't be wrong as it's not my information Dunlop can be wrong and you're free to ring them up like I did to ask them. He was a nice chap and he definitely said 40 to 50C

Interesting though that Toyo state 70 to 100C for R888 which is of course way higher. But also interesting is that on that cold day At Silverstone (9C) I could not get my rears above 36.5C and my fronts were around 44C

MR Tyre (just rang him) reckon between 50 to 70C so a bit higher but a lot lower than ToyoR88 still. The highest I have seen mine (AudiS3) was at my Brands race in May where the fronts were around 56 and the rears were around 47. The back was a bit loose sometimes at Graham but the front and turn in was great so we didn't adjust them during the pit stop and I came second by 5 seconds after an hour so something must have been right ha ha.

Edited by Soul Reaver on Wednesday 28th October 13:22

[Mansells Tash]

Soul Reaver said:

I can't be wrong as it's not my information Dunlop can be wrong and you're free to ring them up like I did to ask them. He was a nice chap and he definitely said 40 to 50C

Interesting though that Toyo state 70 to 100C for R888 which is of course way higher. But also interesting is that on that cold day At Silverstone (9C) I could not get my rears above 36.5C and my fronts were around 44C

MR Tyre (just rang him) reckon between 50 to 70C so a bit higher but a lot lower than ToyoR88 still. The highest I have seen mine (AudiS3) was at my Brands race in May where the fronts were around 56 and the rears were around 47. The back was a bit loose sometimes at Graham but the front and turn in was great so we didn't adjust them during the pit stop and I came second by 5 seconds after an hour so something must have been right ha ha.

Edited by Soul Reaver on Wednesday 28th October 13:22

By contrast I can cook Toyos in 5 laps. Direzzas would be toast straight away.

[Soul Reaver]

Yeah If I use R888 they are screwed after 25 mins on a circuit like Brands, they do last a bit longer on the longer circuits. I would use the Toyo as an Inter as my Dirrezas don't work at all in the damp. Ill try the new R888R next year to give it a go in the dry and also wet.

[Mansells Tash]

Soul Reaver said:

Yeah If I use R888 they are screwed after 25 mins on a circuit like Brands, they do last a bit longer on the longer circuits. I would use the Toyo as an Inter as my Dirrezas don't work at all in the damp. Ill try the new R888R next year to give it a go in the dry and also wet.

I can't wait until R888Rs are out available out here!

[Mansells Tash]

Interestingly I ran a race on R888 vs another car on R888R's this weekend. He improved by over a second on Losail from his PB, however the big shock for me was by reducing the tire pressures (28->26psi front and 26->24psi rear) on a fwd 1100kg Civic EP3 all I did was ruin the handling and induce loads of understeer.