: Tire Pressures



Innisfree
09-11-12, 08:14 PM
Sorry if this is an old topic!

I have 2011 M6 V White Diamond (after 2009 A6 Black Raven)

Struggling to find optimal tire pressures. Don't track. But like to drive quick (even though I''m well over the magic 60 mark, I can still hit a 0.9g turn on the road)

Find that 32 gives me too much "thwack" noise from the tires and too much flex

Sweet spot seems to be 38 or so, equivalent to high speed driving

What do you think? Am I harming the tires (I work for Michelin, so I should know, but I don't)? Where do you find the sweet spot?

Interested in ride/handling above all else. Let me know what you think.

Rob

RGaret
09-11-12, 09:28 PM
Sorry if this is an old topic!

I have 2011 M6 V White Diamond (after 2009 A6 Black Raven)

Struggling to find optimal tire pressures. Don't track. But like to drive quick (even though I''m well over the magic 60 mark, I can still hit a 0.9g turn on the road)

Find that 32 gives me too much "thwack" noise from the tires and too much flex

Sweet spot seems to be 38 or so, equivalent to high speed driving

What do you think? Am I harming the tires (I work for Michelin, so I should know, but I don't)? Where do you find the sweet spot?

Interested in ride/handling above all else. Let me know what you think.

Rob

Good question. My BMW had 36 front and 42 rear tire pressure. I always go by the sticker on the door jamb as I assume the chassis engineers worked all of this out. I check my tire pressures religiously and always keep them correct. I want my tires to last as long as possible as tires for this car are just too expensive. I look forward to other peoples responses.
.

smackdownCTSV
09-11-12, 10:19 PM
High 20s in the rear at the track, high 30s on the highway, and low 30s for everyday driving.

1997BlackETC
09-11-12, 10:47 PM
I just leave mine at 33 all around all the time. Anymore than that and the car rides too rough for these bumpy roads around where I live.

baabootoo
09-11-12, 11:28 PM
High 20s in the rear at the track, high 30s on the highway, and low 30s for everyday driving.

Why so low at the back? I use 40 rear and haven't really noticed anything bad. I'm always open for info though. Thanks.

smackdownCTSV
09-11-12, 11:31 PM
That's a silly question. Not sure if serious.

baabootoo
09-11-12, 11:50 PM
I was serious, but maybe we weren't thinking of the same "track". I meant a road curse and not dragstrip.

smackdownCTSV
09-12-12, 12:06 AM
40 is still kind of high, even for the rear tires. Low/Mid 30s gives you the most contact patch. Unless the engineers were lying.

larry arizona
09-12-12, 06:23 AM
dragstrip low 20s sounds right for larger contact patch and I would max out the fronts for less rolling resistance.

baabootoo
09-12-12, 11:28 AM
40 is still kind of high, even for the rear tires. Low/Mid 30s gives you the most contact patch. Unless the engineers were lying.

Ok, I'll give that a try then. thanks.

smackdownCTSV
09-12-12, 12:23 PM
Yup, just going by what the engineers/reps at the V labs advised. Although, I did notice the pressure on the high side at the MMC.

readyact
09-12-12, 04:21 PM
Here's one of the original threads on this same topic. Also keep in mind the tire pressure reading in the DIC is not very accurate so a reliable handheld gauge may be best:

http://www.cadillacforums.com/forums/2009-cadillac-cts-v-general-discussion/175729-best-tire-pressure.html

FLTRI
09-12-12, 04:25 PM
My Vagon shows 32 front, 35 rear on the door sticker. Same for you Coupe & Sedan owners, or is the Vagon different?

JFJr
09-12-12, 04:32 PM
My Vagon shows 32 front, 35 rear on the door sticker. Same for you Coupe & Sedan owners, or is the Vagon different?32 all around for the sedan.

FLTRI
09-13-12, 02:52 AM
32 all around for the sedan.

Thanks, guess the Vagon is just heavier in the rear...

Trionalaw
09-13-12, 09:17 AM
I have my at 37 all the time. Not as supple a ride on street but when heat up on track it keeps the outside quarter of tire from wearing faster. Got the pressures from this forum but didn't save the tread.

jim