981 Winter Tyres - first report

[Krobar]

1db is about 10%, should be detectable in A/B testing.

[gsewell]

sootyvrs said:

As relating to the 7 degree statement... it was said tongue in cheek as it's commonly heard that 7 degrees is the threshold when winter tyres become more effective than summer tyres (in certain curcumstances).. I perhaps should have said when it's "COLD"

Summer tyres and winter tyres will have an overlap where their performance is comparable, probably between 2'C and 12'C or similar. This is the time when there is usually a large window of opportunity to switch the tyres between the two main seasons. I normally switch to summer tyres when the nights remain above 7'C for a week or so and back to winter tyres when the days remain below 7'C for a week or so. But it is not so hard cut as having to carry the spare set of tyres in case the temperature changes during the day!

[bcr5784]

anonymous said:

[redacted]

bks - I suggest you read any of the literature. Eg http://www.globalrph.com/master_speaker.htm It recons 10 db is subjectively twice as loud - and they certainly are that. If you read any other literature on tyres you will find they say that 3db is just detectable 5db is noticeable. Having listened to test records and cds I have some idea what a 10db difference sounds like - you clearly don't.

[bcr5784]

anonymous said:

[redacted]

Usual mindless drivel based upon no evidence whatsoever.. Tyre noise tests are conducted on a specific road surface - see https://www.youtube.com/watch?v=u02SFvuDnqE . If you haven't noticed that in reality noise varies greatly from surface to surface you must be deaf. Before getting abusive, why don't you do a little research, just to check that you are not talking out of your backside.

[ATM]

Lads

I've got some 18 inch Cayman alloys with correct Pirelli N rated winters for the 981 on my Boxster. Thought I'd give them a try. I had the Michelin 19 inch last winter which I still have some where in my lock up. So far I think the ride is a bit crashier than I expected at the back and the car feels a bit loose at the back so ... what pressure should these be on?

Edited by ATM on Tuesday 4th June 19:45

[bcr5784]

The book (page 231) says 32psi all round - but remember thats probably at 20C - so perhaps a tad lower if the car is outside.

[ATM]

bcr5784 said:

The book (page 231) says 32psi all round - but remember thats probably at 20C - so perhaps a tad lower if the car is outside.

Thanks

I dont have a book.