Upgrading ss to z28 suspension and maybe further? - Page 3 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Matty Ice · 05-22-2020, 10:16 AM

You don't need 11" wheels to take advantage of the Z28 suspension, a 10" wheel wheel be just fine for the street. There is not much difference between a 305/11 and a 285/10. Keeping the square setup and tire choice makes more of a difference. The reason GM went with the 19x11 was that it was a proven max effort for the track. They were going with a lighter wheel than the ZL1/1le platforms and since they using a different wheel might as use the biggest possible. There is a Motor trend article where they swapped wheels/tires between a 1le and a Z28. Then there is the reason GM put the 20x11 on the 1le. They wanted to remove under steer and stretching the 285 tire on the 11" helped them attain that. That carried over to the Z28 a little bit by using a 11.5" wheel. If you run a 19" wheel you will have serious fender gap issues, that's why GM put the wheel flares on the Z28. If you are only driving on the street a 20x10 set up will be the best for you as you can rotate the wheels/tires. Optimal would use 20x11 in the rear to take out some under steer.

Scooter18155 · 05-23-2020, 10:56 AM

Quote:

Originally Posted by Matty Ice

You don't need 11" wheels to take advantage of the Z28 suspension, a 10" wheel wheel be just fine for the street. There is not much difference between a 305/11 and a 285/10. Keeping the square setup and tire choice makes more of a difference. The reason GM went with the 19x11 was that it was a proven max effort for the track. They were going with a lighter wheel than the ZL1/1le platforms and since they using a different wheel might as use the biggest possible. There is a Motor trend article where they swapped wheels/tires between a 1le and a Z28. Then there is the reason GM put the 20x11 on the 1le. They wanted to remove under steer and stretching the 285 tire on the 11" helped them attain that. That carried over to the Z28 a little bit by using a 11.5" wheel. If you run a 19" wheel you will have serious fender gap issues, that's why GM put the wheel flares on the Z28. If you are only driving on the street a 20x10 set up will be the best for you as you can rotate the wheels/tires. Optimal would use 20x11 in the rear to take out some under steer.

Great info thanks for this.

VR Baron · 05-23-2020, 07:10 PM

Why I use 20x10.5 with 285/35 On the street. For autocross I use 19x10.75 and 305/30 for autocross . Though the 19s snd 3.91 gears are fun on the street

05-22-2020, 10:16 AM	#29
Matty Ice Drives: 2015 SS/RS 1LE Join Date: Dec 2014 Location: Milwaukee, WI Posts: 537	You don't need 11" wheels to take advantage of the Z28 suspension, a 10" wheel wheel be just fine for the street. There is not much difference between a 305/11 and a 285/10. Keeping the square setup and tire choice makes more of a difference. The reason GM went with the 19x11 was that it was a proven max effort for the track. They were going with a lighter wheel than the ZL1/1le platforms and since they using a different wheel might as use the biggest possible. There is a Motor trend article where they swapped wheels/tires between a 1le and a Z28. Then there is the reason GM put the 20x11 on the 1le. They wanted to remove under steer and stretching the 285 tire on the 11" helped them attain that. That carried over to the Z28 a little bit by using a 11.5" wheel. If you run a 19" wheel you will have serious fender gap issues, that's why GM put the wheel flares on the Z28. If you are only driving on the street a 20x10 set up will be the best for you as you can rotate the wheels/tires. Optimal would use 20x11 in the rear to take out some under steer.

05-23-2020, 07:10 PM	#31
VR Baron SoCal Camaro5 Race Team Drives: 2021 Shadow Grey Camaro 2SS 1LE Join Date: Mar 2010 Location: SO CAL Posts: 14,297	Why I use 20x10.5 with 285/35 On the street. For autocross I use 19x10.75 and 305/30 for autocross . Though the 19s snd 3.91 gears are fun on the street