wet sprints

[oioi]

Mira (quite damp)

class D winning time - 51.29 (ash) second 53.64, third 53.76

Class F winning time - 51.8, 2nd 52.55 and 3rd 53.06

not sure you can draw a conclusion really...

perhaps it wa a silly question after all.

[Arm]

One I have often thought about.

Not done a back to back comparison so I'm not really qualified to say but I would be suprised in wet weather if the average 1B tyre is worse than the 1A. It will certainly have lost most of its advantage and therefore may give the impression of being terrible but I dont see why it should be worse other than having undermed the drivers confidence. A 1B equipped car should be set-up to take advantage of much better grip levels, the 1A car should be set up for lower grip levels (and the driver will already be happy to slide it around - wet / dry).

Dont see many swapping 1B's to 1A's for 'wet' sprinting.  Acknowledge what Dickie says (except that the field has been levelled and he is better at sliding the car around ?)

Good question.

[oioi]

ollie mount day 1 class F winner 0.1 seconds quicker than class D

ollie mount day 2 class F winner 2.2 seconds faster than class D

same drivers, same track, same cars but weather has gone from (see my avatar wet - im guessing very) to merely wet.

[DickieB]

Ash - thank you!

From discussions at the time, it was more down to operating temperatures.  The slick type tyres need more warmth than the 1As to work well.  I guess the 1As have a broader range where they operate quite well, whereas the sticky tyres have a narrower range where they work brilliantly.  Outside that range the sticky tyres are crap, and the 1As on their "quite well" setting were better!

[Arm]

Dickie

Fair point for a race.

For a sprint, using soft compound ACB 10's ?

[adhawkins]

Anyone here using 21Rs as a wet tyre for the Speed Series? Hope I don't have to find out this year, but that's my road tyre, so would be a candidate for a switch if it did happen.

Andy

[DickieB]

Even more so for a sprint where you have no time to get any heat into them.  However this may well be specific to the Yoko A048s that the RGBs have to use in all conditions.

[fordy]

If your looking at MIRA, then you need the first run only - it dried up throughout the morning - in fact - i seem to recall only the 1st or 2nd practise times would give a comparison, it was dry by the first timed run.

sunday, Pembrey will be a good one to look at - that was V.wet.

I certainly noticed on that day that all the times from the single seaters through to the TVRs,etc, were alot closer together.  I  was only 2 secs off Stuart hills time (stu on 1B's me on 1A's) whereas the saturday (dry,same track) he was way way faster than me.  (im running toyo proxies t1S, there fab)

[ACW]

I think it is a case of many of the answers in life which is 'it depends'. Ive driven wet conditions and by wet i mean a good downpour but sufficient that the water is flowing through the lower points of the surface IYSWIM. In these conditions I's day that standard uncut slick beats, list 1B which beats List 1A in terms of outright grip. I'd say slick has the least reduction in grip, but the greatest variation in grip due to surface water, list 1b next and list 1A next, however as this also hints depending on amount of surface water.

Of course those in 1B and slicks could then use special wet weather tyres - which generally consist of softer rubber, with a much more water shifting tread and lower contact area = higher contact pressure.

[Terry Everall]

I run ACB 10 on my Busa in the dry.

In the damp the ACB 10 can break away with little warning whereas the 1A is more progressive in the wet

In the wet I use CR28 (1B tyres )

At Olivers Mount Paul Edden on1A with screen was similar time to mine but in dry I was 2+ seconds quicker

[davidgh]

So, results from Croft...

which was a lake

Only at Sunny-Out,

and only across half the track  

[Blatman]

You tell me that now...

[machin]

Autocar did a back to back test at one of these tracks with sprinklers (to ensure consistant "wetness"), with the same car on various different tyres (I think they had both 1a and 1b types tyres)...  Can't remember what they concluded but I'll try and dig out the issue... if I remember correctly they did things like braking distances and lap times etc... that'd give a fairly good indication, as comparing times from each class just throws in too many variables (not to mention driver skill...)

My gut reaction was that they found 1a tyres to be best in wet... but I could be making that up........

Machin

[oioi]

would be very interested if you could find the article

OiOi

[MIKEASHTON]

At Olivers Mount earlier in the year, I (1800 on 1A tyres) was only beaten by Steve Robbo running slicks in the rain, and thus beating everyone else in 2L and BEC running a combination of slicks and 1B tyres.