[wnta1ss]

Originally Posted by Stephen12ZL1

sorry about the inaccuracy...11.4@127 is indeed what GM publishes. At near 0ft DA my '17 ZL1 trapped 129.1. No dyno #s unfortunately. Aero drag wasn't really any hindrance running the 1/4 mile. Seems like on the road course above 130mph I can feel more drag in the ZLE but no data to back up this "feeling". It certainly didn't feel like it was dragging an anchor for the second 1/8 mile. If a ZLE were running the 1/2 mile likely the numbers would suffer compared to a standard more slippery ZL1.

Agree that the 1/4 mile trap does not yet show the significance of the higher aero drag of the ZLE model compared to the normal ZL1. However in longer runs, it does become very apparent. For example, all 3 supposed to be stock cars here, the ZLE was tested in a standing mile, and the report was a 161.5mph trap speed. Compare that to the 173.9mph and 175.1mph trap speeds that a couple of normal ZL1s ran in the standing mile, and the aero difference between the models is clear. Watching in-car videos of the ZLE and ZL1 during the tests shows that the ZLE is struggling to continue accelerating at higher speeds when compared to it's brother ZL1.

[JSH]

Originally Posted by wnta1ss

Agree that the 1/4 mile trap does not yet show the significance of the higher aero drag of the ZLE model compared to the normal ZL1. However in longer runs, it does become very apparent. For example, all 3 supposed to be stock cars here, the ZLE was tested in a standing mile, and the report was a 161.5mph trap speed. Compare that to the 173.9mph and 175.1mph trap speeds that a couple of normal ZL1s ran in the standing mile, and the aero difference between the models is clear. Watching in-car videos of the ZLE and ZL1 during the tests shows that the ZLE is struggling to continue accelerating at higher speeds when compared to it's brother ZL1.

Fastest laps test results:

[Z OH 6]

Originally Posted by Stephen12ZL1

sorry about the inaccuracy...11.4@127 is indeed what GM publishes. At near 0ft DA my '17 ZL1 trapped 129.1. No dyno #s unfortunately. Aero drag wasn't really any hindrance running the 1/4 mile. Seems like on the road course above 130mph I can feel more drag in the ZLE but no data to back up this "feeling". It certainly didn't feel like it was dragging an anchor for the second 1/8 mile. If a ZLE were running the 1/2 mile likely the numbers would suffer compared to a standard more slippery ZL1.

I got to disagree that the wing isn't slowing it down some in the 1/4 though. There are have been quite a few people remove the 1LE wing and make back to back 1/4 runs and seen up to a 2mph difference.

[wnta1ss]

Originally Posted by JSH

Fastest laps test results:

Those are just ESTIMATES for the 1/2 and mile though, and highly questionable ones as far as I'm concerned. Check out some track testing (much more meaningful than some estimate) of the 2 models that I mentioned in my post:

First, the ZLE trapping 161.5 in the mile

Now, the normal ZL1 trapping 173.9 in the mile

Should be evident which model accelerates better at higher speeds, and it's not the ZLE. This is NOT insulting the ZLE, it's just the truth. ZLE gives up some of the all-around capabilities of the ZL1 to become a more-focused road-course car is all.

[JSH]

Originally Posted by wnta1ss

Should be evident which model accelerates better at higher speeds, and it's not the ZLE. This is NOT insulting the ZLE, it's just the truth. ZLE gives up some of the all-around capabilities of the ZL1 to become a more-focused road-course car is all.

My post was mainly about stock quarter mile and shorter times which is what the OP thread is about. Almost no one ever races half mile and one mile in a stock ZL1. I don't believe that Colorado has any such races this year

[Z OH 6]

Originally Posted by JSH

My post was mainly about stock quarter mile and shorter times which is what the OP thread is about. Almost no one ever races half mile and one mile in a stock ZL1. I don't believe that Colorado has any such races this year

If there's a 12.4mph difference in the half mile between a ZL1 and a 1LE, you can bet some of that is going to show up in the 1/4 too. Some members on the FB groups have done back to back tests with the wing on and off and see up to a 2mph difference on a stock ZL1. If the car is modified and travels even faster through the 1/4, that difference is going to be even greater.

[KILLA BEE]

Originally Posted by Stephen12ZL1

I have a '21 ZL1-1LE which is stock. The only mod is flex fuel sensor and appropriate Jannetty tune for the flex fuel...running 47%E. I am a road course guy but my friend rented MIR dragstrip so I said, "what the hell...why not?".

The DA was +250ft and Maryland is known to be a fast track. Unfortunately, I only had two runs and the first was the best. Rain caused the lack of runs. This thing was ridiculously rapid considering my previous '17 ZL1 in near 0ft DA ran 11.003@129. I used my buds 285/35-19 M/T drag radials on CTS-V wheels. Slips posted below:

I LOVE THESE STORIES FOR ALL THE AERODYNAMIC CRAP TALKERS! #A10 4lyfe

[KILLA BEE]

Originally Posted by Stephen12ZL1

Love that A10

[KILLA BEE]

Originally Posted by Stephen12ZL1

sorry about the inaccuracy...11.4@127 is indeed what GM publishes. At near 0ft DA my '17 ZL1 trapped 129.1. No dyno #s unfortunately. Aero drag wasn't really any hindrance running the 1/4 mile. Seems like on the road course above 130mph I can feel more drag in the ZLE but no data to back up this "feeling". It certainly didn't feel like it was dragging an anchor for the second 1/8 mile. If a ZLE were running the 1/2 mile likely the numbers would suffer compared to a standard more slippery ZL1.

Doubt it run it and see

[KILLA BEE]

Originally Posted by Z OH 6

If there's a 12.4mph difference in the half mile between a ZL1 and a 1LE, you can bet some of that is going to show up in the 1/4 too. Some members on the FB groups have done back to back tests with the wing on and off and see up to a 2mph difference on a stock ZL1. If the car is modified and travels even faster through the 1/4, that difference is going to be even greater.

FALSE!’ that aero dynamics crap people love bringing up doesn’t really kick in until 150. That’s not gone touched in a shorter race

[mlee]

Holy Crap... just now saw this thread. 10's with E and DRs... that's unreal!!!

Great 60' too

[Z OH 6]

Originally Posted by KILLA BEE

FALSE!’ that aero dynamics crap people love bringing up doesn’t really kick in until 150. That’s not gone touched in a shorter race

Oh it's certainly not false. As I've already stated, people have done back to back tests removing the wing and see up to 2mph trap speed difference in the 1/4. Sorry man, but the laws of physics apply to you too. There's no free lunch.

Even Motortrend found a 1mph difference in the 1/4.

https://www.motortrend.com/features/...e-cars?slide=6

[JSH]

Originally Posted by KILLA BEE

I LOVE THESE STORIES FOR ALL THE AERODYNAMIC CRAP TALKERS! #A10 4lyfe

The 1LE is overall so much quicker than the Zl1 that the haters are left to grope around for some metric to point at in an attempt to diminish our car's superiority. ZOH6, who's on my ignore list so I can't see his posts, is one of the loudest haters (so please don't quote him). And of course, he's probably never owned either car.

[KILLA BEE]

Originally Posted by JSH

The 1LE is overall so much quicker than the Zl1 that the haters are left to grope around for some metric to point at in an attempt to diminish our car's superiority. ZOH6, who's on my ignore list so I can't see his posts, is one of the loudest haters (so please don't quote him). And of course, he's probably never owned either car.

Agreed