New Shoes on the Grand Sport!!
05-14-2013, 11:09 PM
#1
Safety Car
Thread Starter
New Shoes on the Grand Sport!!
Been waiting to put the new Michelin PSS's on, finally got it done today, along with a PFADT Street alignment.
All I can say is WOW!
I went with stock 275's up front, and stepped up to 345's in the rear. I am thinking I could have gone with 285's in front...
I really like the way the 345's fill up the rear wheel well. As you can see from the side-by-side pix of the Michelin's next to the GY Gen 2's, the PSS's are more of a square-shouldered tire, and the 345's are about 3/4" wider than the GY 325's. The PSS 345's were cheaper than PSS 325's, as well.
Got the tires from Discount Tire Direct. The rears were $415, and the fronts were $254. Thats $1338, NO TAX, FREE SHIPPING! I missed out on the $70 Michelin rebate, but the installer gave me $100 for the stock tires, so install was FREE. The alignment was $101...
I had them douse the lowering bolts with Liquid Wrench while the tires were off, just in case I eventually decide to drop it slightly...
Original stance with the stock tires..
With the new PSS's... hasn't really settled yet.
Alignment...
I am very pleased!!!
All I can say is WOW!
I went with stock 275's up front, and stepped up to 345's in the rear. I am thinking I could have gone with 285's in front...
I really like the way the 345's fill up the rear wheel well. As you can see from the side-by-side pix of the Michelin's next to the GY Gen 2's, the PSS's are more of a square-shouldered tire, and the 345's are about 3/4" wider than the GY 325's. The PSS 345's were cheaper than PSS 325's, as well.
Got the tires from Discount Tire Direct. The rears were $415, and the fronts were $254. Thats $1338, NO TAX, FREE SHIPPING! I missed out on the $70 Michelin rebate, but the installer gave me $100 for the stock tires, so install was FREE. The alignment was $101...
I had them douse the lowering bolts with Liquid Wrench while the tires were off, just in case I eventually decide to drop it slightly...
Original stance with the stock tires..
With the new PSS's... hasn't really settled yet.
Alignment...
I am very pleased!!!
05-15-2013, 12:32 AM
#3
Burning Brakes
Looks Good!
But be alert for potential traction control override issues when T/C is activated (default mode). You're right on the cusp running a 1.6" front/rear diameter differential, but I think you'll be okay. If not, you may have to go to 285s up front.
But be alert for potential traction control override issues when T/C is activated (default mode). You're right on the cusp running a 1.6" front/rear diameter differential, but I think you'll be okay. If not, you may have to go to 285s up front.
05-15-2013, 12:44 AM
#4
Le Mans Master
You are gonna love these tires !
05-15-2013, 01:20 AM
#5
Tech Contributor
I continue to read about Z06 guys running 295 30 18 and 345 30 19 tires which gives a ~2" differential and they report no issues.
05-15-2013, 01:52 AM
#6
Sr.Random input generator
Bottom-line: Any config not closely matching the stock ratio (not even the difference in diameters, the exact ratio of diameters between front and rear) degrades and reduces the robustness of the traction control and the stability control. If you're turning everything off whenever you drive your car, sure, not a big deal, but if you depend on these systems like most Corvette owners do, it's less than ideal.
As I mentioned before, having a larger diameter difference has the effect of 'numbing' the nannies, so for those using that 295/30/18 345/30/19 set-up with Michelin Pilot Sport Cup tires at the track, it's less of an issue. I would personally not recommend it for the street use.
05-15-2013, 02:12 AM
#8
05-15-2013, 02:18 AM
#9
Sr.Random input generator
05-15-2013, 02:19 AM
#10
Sr.Random input generator
Are you sure about this? I don't remember non-run-flat C5 Corvettes coming with different pressure recommendations; do I recall it wrong? I personally run all tires at 30 PSI flat on all corners. PSS tires usually come to about 34-35 PSI on highway, which I believe is the sweet spot for these tires.
05-15-2013, 02:31 AM
#11
Tech Contributor
Having the ratio difference closer than the stock is one problem, having it much higher is another. The setup you mentioned in the quote is the latter, and may cause "Engine drag" message to be displayed at high speed especially if all nannies are fully turned on. Having the ratios closer than they already are is a bigger issue, though, since it causes active handling/traction control to light up since the drop in (rotational) speed difference in between tires suggest that there must be a traction issue (like spinning, etc.), while there isn't.
Bottom-line: Any config not closely matching the stock ratio (not even the difference in diameters, the exact ratio of diameters between front and rear) degrades and reduces the robustness of the traction control and the stability control. If you're turning everything off whenever you drive your car, sure, not a big deal, but if you depend on these systems like most Corvette owners do, it's less than ideal.
As I mentioned before, having a larger diameter difference has the effect of 'numbing' the nannies, so for those using that 295/30/18 345/30/19 set-up with Michelin Pilot Sport Cup tires at the track, it's less of an issue. I would personally not recommend it for the street use.
Bottom-line: Any config not closely matching the stock ratio (not even the difference in diameters, the exact ratio of diameters between front and rear) degrades and reduces the robustness of the traction control and the stability control. If you're turning everything off whenever you drive your car, sure, not a big deal, but if you depend on these systems like most Corvette owners do, it's less than ideal.
As I mentioned before, having a larger diameter difference has the effect of 'numbing' the nannies, so for those using that 295/30/18 345/30/19 set-up with Michelin Pilot Sport Cup tires at the track, it's less of an issue. I would personally not recommend it for the street use.
05-15-2013, 07:04 AM
#16
Team Owner
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05-15-2013, 07:17 AM
#17
Melting Slicks
It looks good you will see a huge difference from the GY's.
Why does your rear mud guard look so much different in color from your diffuser?
Why does your rear mud guard look so much different in color from your diffuser?
05-15-2013, 08:08 AM
#19
Team Owner
