Pilot Sport Cup 2 345 30ZR19 in the rear for ACR

[Jack B]

Just an opinion, i would not worry about it until the roads warm up. Trying to make ESC/traction control non-invasive with the viper's torque is tough. Another opinion, the viper is severely limited unless you run corsa's or 888's (or similar). I log pedal versus throttle, the nannies are there, even when they are not felt.

[ViperGeorge]

Jack, With my Wrangler Rubicon 4Wheel Parts (the company I go to for my Jeep stuff) used an inexpensive tuner device to change tire sizes so that my speedometer stayed roughly correct. Could the same be done for the Viper to make ESC/Traction work properly with different tires? Could this be done with HPT?

[serpent]

FWIW, I’m on 295/30-19 front and 345/30-20 rear. Michelin Pilot Sport 4S.
Car is lowered on MCS WNR1 coilovers. I get a slight amount of rubbing in the front. Since these are street tires I’m going to experiment with a 285 wide front.

No issues with traction or grip. I went up 1” all around in wheel diameter.
They grip on cold roads too. Car feels way more planted than the pzero grip tires.

[texasram]

FWIW, I’m on 295/30-19 front and 345/30-20 rear. Michelin Pilot Sport 4S.
Car is lowered on MCS WNR1 coilovers. I get a slight amount of rubbing in the front. Since these are street tires I’m going to experiment with a 285 wide front.

No issues with traction or grip. I went up 1” all around in wheel diameter.
They grip on cold roads too. Car feels way more planted than the pzero grip tires.

Did you have regular p zeros or corsas

[Jack B]

Jack, With my Wrangler Rubicon 4Wheel Parts (the company I go to for my Jeep stuff) used an inexpensive tuner device to change tire sizes so that my speedometer stayed roughly correct. Could the same be done for the Viper to make ESC/Traction work properly with different tires? Could this be done with HPT?

The G5 version of hpt is very basic. Unless something changed recently wheel speed can not be addressed. Arrow can access wheel speed, however, they may not want to generate "one-of" tunes.

[serpent]

Did you have regular p zeros or corsas

regular p-zero. if they were corsas i would've said corsas.

[ViperGeorge]

FWIW, I’m on 295/30-19 front and 345/30-20 rear. Michelin Pilot Sport 4S.
Car is lowered on MCS WNR1 coilovers. I get a slight amount of rubbing in the front. Since these are street tires I’m going to experiment with a 285 wide front.

No issues with traction or grip. I went up 1” all around in wheel diameter.
They grip on cold roads too. Car feels way more planted than the pzero grip tires.

I believe the traction system uses the proportional wheel speed front to rear to determine slip. Increasing diameters both front and rear may keep proportions similar to OEM. I'd have to do the math on your setup to see how close the ratio front to rear is to stock.

[serpent]

I believe the traction system uses the proportional wheel speed front to rear to determine slip. Increasing diameters both front and rear may keep proportions similar to OEM. I'd have to do the math on your setup to see how close the ratio front to rear is to stock.

Yea the stock pzero tires are 295/30-18 front and 355/30-19 rear.

[texasram]

regular p-zero. if they were corsas i would've said corsas.

So why did you call the regular p zeros "grip tires" if the corsas have more grip.

[ForTehNguyen]

PZero tires = Zero Grip tires

[texasram]

PZero tires = Zero Grip tires

yes on the hellcat forum, pzeros are notoriously hated because of their low grip/relative high cost/tread-wearing properties

[ForTehNguyen]

they came on the 2015-2017 Mustang GT performance packs, and the rears would be destroyed in 8k miles even without heavy use. People swapped, including me, to PSS and the difference was night and day. Why I opted to go with 285/345 width PSS on the viper. I did not want pirelli poop zeros again

[serpent]

So why did you call the regular p zeros "grip tires" if the corsas have more grip.

PZero tires = Zero Grip tires

the nguyen is right, i meant to say zero grip. the regular p zeros are shit. Had experience with them on a '13 5.0 and '15 viper now.

[LmeaViper]

yes on the hellcat forum, pzeros are notoriously hated because of their low grip/relative high cost/tread-wearing properties

PZero tires = Zero Grip tires

------------

Not sure I would say zero grip. Granted they aren't like Corsa's, however as best I recall, I can still go full throttle in second on them on the street and not get more than a little wheel spin.

[PkB2014]

I haven't had any ABS or Esc issues and I run Hoosiers for some Autocross on my Car in
315/30r18
345/30r19
Going to use regular PZeros in stock sizes for stock class since it's really the only option close to the 200TW limit. Maybe PSS would be better IDK, but I'm trying these out for a few events.

[Jack B]

I haven't had any ABS or Esc issues and I run Hoosiers for some Autocross on my Car in
315/30r18
345/30r19
Going to use regular PZeros in stock sizes for stock class since it's really the only option close to the 200TW limit. Maybe PSS would be better IDK, but I'm trying these out for a few events.

what about corsa's

[ForTehNguyen]

PSS is unquestionably better than Poop Zeroes

[PkB2014]

what about corsa's

What about them? I liked them, but they are 60TW so they are not allowed for SS class in SCCA Autocross. I can run SSR, but then I might as well run Hoosiers, which is what I do when I run in that class.

PSS is unquestionably better than Poop Zeroes

Can you show me some verified numbers in Autocross times that compare the two? I had PSS before on other cars and thought they were good, but I'm more concerned about concrete numbers instead of "feel". Sadly most Autocross tire comparisons are for the actual Autocross tires like RE-71r and Rival S 1.5. But no one makes a good Stock class 200TW tire for the Viper. Kumho ACR tire is no longer legal either.

[ViperGeorge]

I haven't had any ABS or Esc issues and I run Hoosiers for some Autocross on my Car in
315/30r18
345/30r19
Going to use regular PZeros in stock sizes for stock class since it's really the only option close to the 200TW limit. Maybe PSS would be better IDK, but I'm trying these out for a few events.

I wonder if they changed the calibration of the ESC/Traction system. I ran these exact sizes in my 2015 TA 2.0 and the car was not driveable with the ESC/Traction system on. Had to turn it completely off.

[ForTehNguyen]

dont have numbers, just know that even on my GT the tires would break loose from an aggressive launch with the PZeros but didnt with PSS. PZeros cost just as much, were noiser, less smooth, and treadwear was trash.

[PkB2014]

dont have numbers, just know that even on my GT the tires would break loose from an aggressive launch with the PZeros but didnt with PSS. PZeros cost just as much, were noiser, less smooth, and treadwear was trash.

I understand that viewpoint from a drag race on the street having fun in a straight line point of view. I'm more interested in warmed up tires on a (small) road course with turns and good braking. I might just need to get some 18" rear wheels to fit some 335s like the corvette guys use. I'll see how the PZeros workout first though.

[ForTehNguyen]

note that PS4S front 18" tires are available in a viper size 285/35/18, now they just need to make the 19" have a 345 width. Widest they have now is 325/30/19

Wish continental made their new ExtremeContact Sport in viper sizes, they are suppose to be on par with PSS but less expensive. They do make a 285/30/18 front but widest 19" they have is 325/30/19

[ViperGeorge]

note that PS4S front 18" tires are available in a viper size 285/35/18, now they just need to make the 19" have a 345 width. Widest they have now is 325/30/19

Wish continental made their new ExtremeContact Sport in viper sizes, they are suppose to be on par with PSS but less expensive. They do make a 285/30/18 front but widest 19" they have is 325/30/19

The stock Gen 5 front tire on a non-ACR is a 295/30/18 and 295/25/19 on an ACR (about the same diameter). The 285/35/18 is 10mm narrower and almost 1 inch taller.

[LmeaViper]

I understand that viewpoint from a drag race on the street having fun in a straight line point of view. I'm more interested in warmed up tires on a (small) road course with turns and good braking. I might just need to get some 18" rear wheels to fit some 335s like the corvette guys use. I'll see how the PZeros workout first though.

I have driven both the PZero's and PSS on track for a full day each. Keep in mind the PZero's were on the Viper and the PSS were on a different smaller car. My personal assessment is that on track, the PSS to me seemed ok to decent, but the PZero's were better than I expected.
lol how's that for an objective and definitive response?

[ViperGeorge]

I ran the Pzeros in One Lap for two years on a 2015 TA 2.0. They scared the hell out of me in the rain. Hydroplaned like crazy. Now I run Michelins. Pzeros suck IMO.