305s and 285s vs 285s all around?

[PumpinIron]

I've got 20x11 rear wheels and 20x10 front wheels. I'm debating on whether to go with 285/35R20s in the front and 305/35R20s in the rear, or just go with 285s all around like the 1LE was equipped with.

Has anyone tried both setups? I'm looking for opinions.

The car is not a drag race car, nor is it a daily driver. It is a spirited driving weekend car and may occasionally see a track day or two per year. It never gets driven during the rain or inclement weather.

Also worth nothing is that it is a 2013 SS (LS3) with soon to be around 520rwhp, and an end goal of about 600rwhp (naturally aspirated).

[pyroguy]

A quality, appropriate tire will get you there with either, but you're more likely to hook up that power regardless of the tire with a 305 than a 285.

[PumpinIron]

That was part of my concern as well, is the 285s in the rear being able to put as much power down.

The only reason the 285s all around appealed to me was because I heard that on the 1LE it helps to dial out a lot of the understeer.

However (and correct me if I'm wrong), with that much power and coilovers / sway bars coming soon, I should be able to dial out a lot of the understeer just with the suspension setup alone.

[KillboyPowerhead]

With that kind of power I'd opt for the wider rears. As mentioned, if you feel there is too much understeer or oversteer you can choose your sway bars and spring rates accordingly (stiffen the rear for less understeer/more oversteer, or vice versa).

[UBB]

I have 285's on all four corners and am at approx 520 HP.

While the car handles really well it doesn't hook worth a damn FWIW

[DRKS1D3]

Originally Posted by PumpinIron

That was part of my concern as well, is the 285s in the rear being able to put as much power down.

The only reason the 285s all around appealed to me was because I heard that on the 1LE it helps to dial out a lot of the understeer.

However (and correct me if I'm wrong), with that much power and coilovers / sway bars coming soon, I should be able to dial out a lot of the understeer just with the suspension setup alone.

The difference is going to be negligible. Neither tire is going to get the car to hook from a dig. The only way that is going to happen is if you go with a street slick. Now, if you're just using the car for spirited corner carving (as you stated), a square set-up is where it's at. I ran a 285 square w/ Hotchkis 1 1/2" Race Springs on my Camaro SS and it handled like it was on rails.

[PumpinIron]

Originally Posted by DRKS1D3

The difference is going to be negligible. Neither tire is going to get the car to hook from a dig. The only way that is going to happen is if you go with a street slick. Now, if you're just using the car for spirited corner carving (as you stated), a square set-up is where it's at. I ran a 285 square w/ Hotchkis 1 1/2" Race Springs on my Camaro SS and it handled like it was on rails.

Which tires were you running?

[DRKS1D3]

Originally Posted by PumpinIron

Which tires were you running?

GY Eagle Supercar G2's. The same tire that came on the 5th Gen 1LE and ZL1.

[Marotrent]

Originally Posted by PumpinIron

I've got 20x11 rear wheels and 20x10 front wheels. I'm debating on whether to go with 285/35R20s in the front and 305/35R20s in the rear, or just go with 285s all around like the 1LE was equipped with.

Has anyone tried both setups? I'm looking for opinions.

The car is not a drag race car, nor is it a daily driver. It is a spirited driving weekend car and may occasionally see a track day or two per year. It never gets driven during the rain or inclement weather.

Also worth nothing is that it is a 2013 SS (LS3) with soon to be around 520rwhp, and an end goal of about 600rwhp (naturally aspirated).

Just a question but what type of mods will you need to get to 600whp NA?

[PumpinIron]

Originally Posted by Marotrent

Just a question but what type of mods will you need to get to 600whp NA?

Currently I have the GPI Max Performance package along with full headers, exhaust, intake, MSD manifold, and underdrive pulley. That’s good for around 500-540 at the wheels depending.

Next I am going to do a built 427 block. That should get me to around 600rwhp give or take.

[pnwdan]

The general consensus from people I have talked to is the advantage of running a square setup is in the track cornering. It will handle better on curves. If you have a goal of 500-600 hp you should be fitting as much rubber as you can under there

[shibbs]

I went with 285s in the front, 305 or 315 in the back. Then adjusted my alignment to have neutral toe in the front, with 1.7 degrees camber, and a tiny bit of toe in in the rear with only half a degree of camber.
Basically, the wider tire will allow you to use less camber to get the same amount of grip.

....And 13" of tire in the back just looks badass.

[DRKS1D3]

Originally Posted by PumpinIron

I've got 20x11 rear wheels and 20x10 front wheels. I'm debating on whether to go with 285/35R20s in the front and 305/35R20s in the rear, or just go with 285s all around like the 1LE was equipped with.

Has anyone tried both setups? I'm looking for opinions.

The car is not a drag race car, nor is it a daily driver. It is a spirited driving weekend car and may occasionally see a track day or two per year. It never gets driven during the rain or inclement weather.

Also worth nothing is that it is a 2013 SS (LS3) with soon to be around 520rwhp, and an end goal of about 600rwhp (naturally aspirated).

I just noticed that you're running an 11" wheel in the rear. That is going to be a stretch for a 285 tire. I ran a 20x9 square when I swapped to 285 tires on all corners. If you're going square, 305's on all corners may be your best bet. JMHO.

[gpskinzhut]

Originally Posted by DRKS1D3

I just noticed that you're running an 11" wheel in the rear. That is going to be a stretch for a 285 tire. I ran a 20x9 square when I swapped to 285 tires on all corners. If you're going square, 305's on all corners may be your best bet. JMHO.

Nah. 1LE's come with 285/35's in the rear on the 11" rims from the factory.