bloke

Viken,

At least you got your sense of humor back today. As for me back to work so I can be more miserable.

Greg Fishman

[quote]Originally posted by 02_996_C2:
<strong>Greg, I don't agree with you! I strongly believed the germans prep their cars as close to spec as possible when they roll out of the assembly line. </strong><hr></blockquote>

Strongly believing something doesn't make it true. I haven't done any scientific research but how much pressure is in your tires at delivery is hardly a noteworthy spec. I sure wouldn't put any credence in that. If your car was delivered with a quart of oil low (mine was) does that mean all Porsche should have less than the stated oil level? Absolutely not, the dealer just overlook this and other things as well.

Greg

02_996_C2

Greg, please read what i said, every manufacturer has their range of tolerances on production. I also mentioned germans prep their cars as close to spec as possible. There is always human errors, overlook of things. I also said, depend on your luck!!!

A quart of oil less when you got your car, still within safety margin...not going to hurt your car/engine.

Differences in tire pressure in your car is also kind of tolerances in manufacturing standpoint. That's why not all 996 has the engine problem. Some do, some don't. That is tolerances, or your luck!

I just want to share my findings with everyone here, just trying to tell everyone 44psi on tire is ridculous! That is! You can run anything you want anyway. Just read that, the PAG recommends number is way off!!!!

Nothing offensive, but back to the point, PAG rec. tire pressures are questionable and german cars are prepped among the best is unquestionable. <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

996FLT6

With respect to tire pressures what can go wrong with having PAG's recommendations for tire pressures? I imagine if for street it shouldn't be a problem but for track use that's a different story since tires get so hot tire pressures go way up above 44 psi. I set mine at 36 rear/32 front for track but inflate to normal specs for street. Regards. Mike

Palting

OK. Let's see if we can confuse the issue some more. Here are pictures of PZero's on a friends '02 996 TT that he runs at the recommended pressures of 36/44 on the street, and slightly HIGHER when he runs on the track. And, boy, does he run on the track. He's been to Dijon, Nurburgring, and Dijon again, all in the last few months.

Without further ado, here are the pics:

Early on:




Much later:

ignacio

palting

how many miles on the tires in the "much later" pictures? they certainly don't appear worn out in the center of the tread alhough the outer edge has lost almost all tread.agreed?

what do you think viken? <img src="confused.gif" border="0">

Pierre

[quote]Originally posted by ignacio:
<strong>palting

how many miles on the tires in the "much later" pictures? they certainly don't appear worn out in the center of the tread alhough the outer edge has lost almost all tread.agreed? [...]
</strong><hr></blockquote>

Hi guys,

These tires are (were!) mine, so here are the details. (Hey Palting, nice to see you here too!)

Pictures 2 (front tire) was taken at the end of a track-day in Dijon. Picture 1 (rear tire) has been taken a few days later, after about 500-600 km driven on the street. I then had to replace the rear ones in prevision of some other track-days and of some longer trips.

Picture 3 is from the left rear tire. But this is not the same tire as pic 1 and 2. This tire survived 4 days at the Nuerburgring, 2 days in Dijon, and quite a few 'normal' km. After my last day in Dijon, it was obvious that the left-hand tires were much more worn out than the right-hand ones. Yeah, Dijon and the N'ring both turn clockwise.

About the pressure: I've no real clue what pressure to use on the track, that's why I keep the street settings. I've been recommended to set it a little bit higher, but I'm still looking for good advices... BTW, I'll spend next Sunday and Monday in Imola/IT, and will ask the instructors about that.

Greetings,
--Pierre

993RS

I discussed this with a friend of mine who is a Carrera Cup driver. When racing, they use: 20-21 cold which becomes when hot 30-31 on both front and rear.

Palting

Hey, Pierre, good to see you here! You'r my kind of guy. The kind that doesn't obsess about his Porsche. Just takes it and drives it!

OK, there's the skinny on those tires, guys.

Viken

[quote]Originally posted by 993RS:
<strong>I discussed this with a friend of mine who is a Carrera Cup driver. When racing, they use: 20-21 cold which becomes when hot 30-31 on both front and rear.</strong><hr></blockquote>

I don't think we should confuse the issue by including racing slicks into the picture.

Greg Fishman

[quote]Originally posted by 993RS:
<strong>I discussed this with a friend of mine who is a Carrera Cup driver. When racing, they use: 20-21 cold which becomes when hot 30-31 on both front and rear.</strong><hr></blockquote>


RS,
You can't equate a race tire's pressure with anything street legal. Interesting data point, but totally irrelevant.

As Viken noted earlier, Ferrari even recommends different pressures for different tires.

993RS

Why irrelevant? It seems to point out to me that for extreme racing low tire pressure is used. At the other end, Porsche AG recommends high tire pressure to optimize tire safety in street usage (less deformation).

Greg Fishman

RS,
The reason it is irrelevant is because you are trying to make a comparision of racing slicks to street tires. Anyone that has driven on both of them knows that what works for one will mostly likely not work for the other. Kind of an apples to oranges comparision. NO make that watermelon to lemons.

And when I race on DOT R compounds I start with 31/33 and end up with close to 40. What does that tell you? Absolutely nothing.
Greg

993RS

Sorry, I was not clear: he has a Carrera Cup car but is competing in Club Sport which races with Pirelli Pzeros not slicks.

996FLT6

993RS- Does your friend with the cupcar feel that the pressures he's using is optimal setting for his car and has he tried other pressures for a comparison. What was the discernible difference running at those pressures versus running on higher pressures? Last- can I have your car : )? Regards. Mike