ZL1 1LE

[02gtnh]

You're correct, the aero and suspension settings are different. How much the suspension settings are difference, who knows. GT350R has thinner profile tires. That effectively increases the rear diff gear (3.73 -> 3.89 I believe). The R also has stickier tire which is also wider. That's a double whammy.

It won't make up the whole difference, but it will definitely eat up a lot of it. Equally tired I'd say the R is between a half to a full second faster on a high speed 2 minute course.

The question is, how much better are the cup2 over the PSS to really know. That tire test showed Trofeo tires over cup2 and gained 2 sec on the lap. So putting these tires would give the R a 5 sec lap difference. So putting Trofeo tires on a GT350 gain it 5 sec?:shrug:

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[cosmo]

The question is, how much better are the cup2 over the PSS to really know. That tire test showed Trofeo tires over cup2 and gained 2 sec on the lap. So putting these tires would give the R a 5 sec lap difference. So putting Trofeo tires on a GT350 gain it 5 sec?:shrug:

Quite a bit better. Different compound, lighter, much stickier.

[ame]

Best thing I could find quickly, owner believes it is about a 2.2s difference for his car on that track by upgrading to Cup 2 tires over Pilot Super Sports.

Trofeo R's are even more extreme, but also are a bit more temperamental I believe to the correct temperature and wear even quicker than the Cup 2.

 

[richtor]

How much weight did the zl1 1le lose over the 3900lb zl1?

 

[02gtnh]

How much weight did the zl1 1le lose over the 3900lb zl1?

60lbs

 

[Childs Play]

The zl1 1le is Suspension tuning and tires with no tread that's it. Put race slicks on any car and it will be faster. That's all gm did with this car.

So you're saying we should put slippery tires with crap suspension on performance cars? Cause what you're saying is pretty much the recipe for any manufacturer and quick car.

How dare they improve the suspension and improve the car with this and other kind of stuff instead of magic...

 

[richtor]

So by your logic, a GT350 is just as fast as a R with same tires. Boy those who bought a R got screwed.:doh:

Take off 150lbs and add tires it be real close. Those that bought the R got a steal if they did not pay adm. those wheels make up the price difference by themselves.

The question is, how much better are the cup2 over the PSS to really know. That tire test showed Trofeo tires over cup2 and gained 2 sec on the lap. So putting these tires would give the R a 5 sec lap difference. So putting Trofeo tires on a GT350 gain it 5 sec?:shrug:

I've heard 1 to 2 sec on a 2 min track. Cup 2 on the 350TP its running the same time as the z28. Trofeo of the TP and its beating the z28.

Interesting note the z28 could not beat the 2012 zl1.

60lbs

From what, the mag Suspension weighs that much?

How dare they improve the suspension and improve the car with this and other kind of stuff instead of magic...

What I'm saying is race tires on street legal car is smoke and mirrors to the true performance gain. Non oem items and tuning, shaved tires to market invisible gains. Nice job GM!:cheers:

 

[Voodooo]

From what I have read, there is more then that. The suspension, aero, tuning are also different. Just can't see just tires making up 3 sec on the track.:shrug:

I know for a FACT a car with similar set up as mine with same driver same day same track would dust an R by 4+ seconds.

 

[Freedom]

Here's the thing about the R wheels/tires.
The R has less rotational inertia(unsprung weight) and thats a fact. As actual performance gain I wouldnt know.

I know for a FACT a car with similar set up as mine with same driver same day same track would dust an R by 4+ seconds.

Maybe im reading into too much but your setup is modded pretty heavily with tunes and R parts.

 

[richtor]

From what I have read, there is more then that. The suspension, aero, tuning are also different. Just can't see just tires making up 3 sec on the track.:shrug:

Tires make a huge difference in lap times.

#7
The Panther's AvatarThe Panther , 04-04-2012 11:49 AM
Stock C5 Coupe. Switched from NT555 (street tire) to NT-01 and cut ~6 seconds at Road Atlanta. Average driver at best.

 

[Voodooo]

Here's the thing about the R wheels/tires.
The R has less rotational inertia(unsprung weight) and thats a fact. As actual performance gain I wouldnt know.


Maybe im reading into too much but your setup is modded pretty heavily with tunes and R parts.

Take away my headers and tune I'd still be faster then a R.

 

[02gtnh]

I know for a FACT a car with similar set up as mine with same driver same day same track would dust an R by 4+ seconds.

I have no doubt a GT350 can be made faster then a R for less then what a R cost. I only suggested it's going to take more then just tires as someone suggested. If your going to track your car, imho you would be foolish to get a R. But if you want a very good bone stock car that is rare and have the money, then go for it.

 

[richtor]

I have no doubt a GT350 can be made faster then a R for less then what a R cost. I only suggested it's going to take more then just tires as someone suggested. If your going to track your car, imho you would be foolish to get a R. But if you want a very good bone stock car that is rare and have the money, then go for it.

All it takes is tires. Try the A7/R7. Someone cut 4 sec off of a 50 auto cross course by switching tires 4 sec on less than a min course. That's huge!

For gm to place barely legal street tires on their car and say it's faster is a big stretch. Yes it's faster the tires made it faster...
They've doing this forever i.e. shaving tires for better ring times.

 

[02gtnh]

All it takes is tires. Try the A7/R7. Someone cut 4 sec off of a 50 auto cross course by switching tires 4 sec on less than a min course. That's huge!

For gm to place barely legal street tires on their car and say it's faster is a big stretch. Yes it's faster the tires made it faster...
They've doing this forever i.e. shaving tires for better ring times.

Start that topic in the gt350 section, curious on what people would say.:cheers:

 

[JohnnyUtah]

All it takes is tires. Try the A7/R7. Someone cut 4 sec off of a 50 auto cross course by switching tires 4 sec on less than a min course. That's huge!

For gm to place barely legal street tires on their car and say it's faster is a big stretch. Yes it's faster the tires made it faster...
They've doing this forever i.e. shaving tires for better ring times.

So basically any manufacturer that makes a performance car that adds cup/R comp tires that are barely street legal are stretching it? I don't get it. Should every car come with all seasons so that it's fair in your eyes?

Guess what? Pretyy much every manufacturer with a serious performance division makes a package where you get an R comp tire... including Ford.

 

[richtor]

So basically any manufacturer that makes a performance car that adds cup/R comp tires that are barely street legal are stretching it? I don't get it. Should every car come with all seasons so that it's fair in your eyes?

Guess what? Pretyy much every manufacturer with a serious performance division makes a package where you get an R comp tire... including Ford.

Cup 2 are different than Trofeo/slicks in my eyes. If you don't see that no worries.

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