QUOTE (GRAH1 @ 3 Oct 2004, 00:09)......the real problem is the cleaning effect I described earlier the difference it made to me was immense my times increased by 1/2 a second wich really puts you out of the running on a track like pendle , luckily the rest of my runs were fast enough to ensure me a place in the final although it left me with no lane choice but I was happy with black anyway so it was not that bad in the end
Re: the cleaning effect of ortmann tyres.
I did alittle work on this alleged phenomenon before the last Porsche challenge round @ Pendle.
Not desperately scientific but interesting nonetheless
The circuit consists of 70' of cleaned Carrera track with straights of 8', 16' and 12' and two tight infield sections.
First I ran my treated p2 tyred car for one hour, keeping note of laptimes. For the first 45 minutes the laptimes were good, then poor. In the final 15 minutes of the run the track appeared to 'come to' the car and the laptimes dropped by over a second and a half (Low 8s to mid to low 6s).
Next I ran my Ortmann shod car for an hour - laptimes varied between 6.2 and 6.4....
Finally I ran the p2 shod car again - its' laptimes remained in the low 6 second bracket for the following hour - which to my mind appears to refute the 'cleaning' or deleterious effect of ortmann tyres to a rubber shod car.
...and then I went looking for a plaster for the blister on my thumb
Anyway... back to the Pendle Porsche round... All went well till I got the red lane... Not much grip at all
It was like someone had splashed lighter fluid on random bends! Perhaps there's a tyre/prep system that buggers the grip for both ortmanns and conventionally prepped rubber tyres?