Questions about Tires

ScottyB · Post by **ScottyB** » Thu Oct 26, 2006 3:40 pm

Okay I have two questions:

1) I have a track day coming up next week and it is expected to be a high of 50 degrees F. Would you guys recommend I use my AD07's or 25's
I figured you guys would have more experience with track days in cold temps then on my side of the pond.

2) Also, I've noticed on both sets of tires, that I get a steering wheel vibration at around 90 mph. A lot of us in the US have the same problem. Have you guys experienced this as well? or is it a Fed Elise problem?

Uldis · Post by **Uldis** » Thu Oct 26, 2006 3:57 pm

Those are not common tyres over here, but googling I found:

http://www.tirerack.com/tires/tires.jsp ... Neova+AD07

basically not a cold weather tyre.

I can't find anything about the 25 you refer to.

The reference tyre we use over here is the A048:

http://www.tirerack.com/tires/tires.jsp ... ADVAN+A048

What is the 25 like?

MacK · Post by **MacK** » Thu Oct 26, 2006 4:09 pm

Uldis, the AD07 is standard fit on Elises now, and most of us have changed to them from Bridgestones on S2's.

ScottyB, I have the AD07's, but can't comment on them as a track tyre, as I've never tracked with them. If you are expecting a wet track, they would be good, but if it's just dry and cool, I'd imagine other tyres would be better.

ScottyB · Post by **ScottyB** » Thu Oct 26, 2006 4:39 pm

Uldis wrote:Those are not common tyres over here, but googling I found:

http://www.tirerack.com/tires/tires.jsp ... Neova+AD07

basically not a cold weather tyre.

I can't find anything about the 25 you refer to.

The reference tyre we use over here is the A048:

http://www.tirerack.com/tires/tires.jsp ... ADVAN+A048

What is the 25 like?

Sorry I did mean the A048's. I must have been doing some math at the time to come up with 25's.

Post by ed » Thu Oct 26, 2006 4:44 pm

id def stick with the 48s, perhaps just up the pressures slightly.

I run 24/25 cold/road and normally run sub 30 hot/track.

Hope this helps, cheers Ed

Andy G · Post by **Andy G** » Thu Oct 26, 2006 4:46 pm

48'S DEFINATELY FOR THE TRACK.

TRY 22F AND 24R

make sure to take some footage

mac · Post by **mac** » Thu Oct 26, 2006 5:56 pm

50f isn't that really quite cold? - like 10 or 12c?

What's the surface like - is it black tar or a lighter colour?

If it's lighter and as cold as I've said then :-

If so I'd go for the tYre with the tread block to get some heat into the tyre.

That's the problem with the 48's there's no block movement so it's hard to get heat into the tyre on a cold track.

2p or should that be 2c

Mac

Post by **simon** » Thu Oct 26, 2006 9:51 pm

I have to say my AD07s were superb on track at a very cold East Fortune earlier this year. I would use them if it's pretty cold and if it's cold and wet at the SIDC and I decide to book, I'll probably just stick with mine too.

kenny · Post by **kenny** » Thu Oct 26, 2006 10:01 pm

I prefer the 48's on a cold track.

Mine were melting last time in a wee bit of heat.

Uldis · Post by **Uldis** » Fri Oct 27, 2006 9:37 am

Scotty,

those temperatures are firly common here, basically most of the time.
And the 07's have some water clearing capabilities, better that the 48's.

So IMO if you expect rain, you could use them on the track, If dry, stick with the 48's, they're much better.
Pressures have a big say and they vary according to your driving style. Aim to run them at about 26 psi hot (measure just after the session).

And the vibration, it's most likely the tyre fiter not using the correct adapter to balance (for the offset).
I found this in several places and currenly know only one place that can balance them properly.
The Elise/Exige's offset is very different than otehr cars so people are not used to it.

I guess you will have to try several places until you find the best one.

ScottyB · Post by **ScottyB** » Fri Oct 27, 2006 1:13 pm

Thanks for the replies guys.

The vibration thing has a lot of us just scratching our heads. Cars aligned, wheels re balanced, and it's still there. At least on this Elise it's at 90mph and above. My other Elise was a lot more prominent at 80mph.

Post by ed » Fri Oct 27, 2006 1:15 pm

do flat spots cause vibrations despite being properly balanced?!

im sure after my walshy days that this ws the case!

ScottyB · Post by **ScottyB** » Fri Oct 27, 2006 1:50 pm

ed wrote:do flat spots cause vibrations despite being properly balanced?!

im sure after my walshy days that this ws the case!

It's possible, but wouldn't it stop the vibrating after the tires heat up and the flat spots go away?

mckeann · Post by **mckeann** » Fri Oct 27, 2006 1:52 pm

if you flat spot your tyres the flat spots dont just go away when you use them the next time

Uldis · Post by **Uldis** » Fri Oct 27, 2006 1:57 pm

Does it dissappear if you fit new tyres?
Becuase if not, it's down to the balancing as I mentioned...