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Hot Lap Videos of 2:20 lap time at COTA on OEM tires/brakes & M7 ZR1 vs A8 ZR1 racing

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Hot Lap Videos of 2:20 lap time at COTA on OEM tires/brakes & M7 ZR1 vs A8 ZR1 racing

 
Old 05-23-2019, 04:02 PM
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SilveradoSS500
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Default Hot Lap Videos of 2:20 lap time at COTA on OEM tires/brakes & M7 ZR1 vs A8 ZR1 racing

For starters, my rear tow was set near 0 degrees vrs a good amount of tow-in and I had to bedd in new brake pads on fresh tires. You can easily force a heat cycle but it will kill some precious rubber and rotor material, so I did 2 proper heat cycles on the brakes before I stuffed it into T1 at 150mph. After I fix the rear tow and get another set of tires, Iím thinking it will do a 2:18.80 or easily a 2:19 lap time at COTA on OEM tires.

Notice my downshifts 5th down to 2nd...you canít stuff the A8 car like this because the tranny wonít be ready for corner exit as it looks for speed per gear etc for downshifting...if you decelerate at a massive rate, it will only deny the shift so you gotta work with that A8 and learn how to brake at its pace! I did install the LG shifter and itís glorious. I have the Hurst in my LS7 C5Z and had the MGW in my old Z07, Iím sorry but this is the best shifter on the market, period.

So, the A8 ZR1 and my M7 ZR1 have the same exact mods except he has drop spindles and AP Brakes. His car out brakes mine, simple. We were both shocked how hard my car pulls his car. I knew the M7 would be quicker but man it pulls a bus length. We did try to line them up but it didnít work out, Iíve driven his car also... the M7 is quicker in some cases, with a good driver of course. I also donít have PTM on, itís all off. He was in race mode...both cars on OEM tires. We also run our wings near ďflatĒ BTW...

Iím running a 4-point DOT safety belts and ran the 3-point over it lol, 7-points baby! ANDDDD...Iím still flying out of the seat/harness. This thing pulls some serious Gs, it knocked the GoPro off my helmet and I noticed today my steering wheel is loose...with the safety belts, I wasnít even pulling hard on the wheel. Iím only 155lbs lol, it probably wasnít properly torqued at the factory, never had that happen on any of the other 100 Corvettes Iíve driven on track, but all good, that's an easy fix!

I only did a total of 4 on laps, cool down laps between the runs. It went 164mph on the back straight and it was hot outside. Just listen to this thing scream, it dyno'd 711/653 with intake tube/corsa x-pipe a while ago. I've added the Katech Ported TB since then and my blower is screaming... the Katech ported TB and Weapon X intake tube are a MUST!

PDR 2:20.79

Helmet Cam 2:20.79
Camera settings were messed up during this run

A8 ZR1 chasing me, my car laying down liquid rubber

A8 ZR1 chasing me during 2:20, first 1.5 laps are warm up

Harness bar mount camera view during run 2




Last edited by SilveradoSS500; 05-24-2019 at 03:19 PM.
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Old 05-23-2019, 04:12 PM
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For the "worst C7 to leave Bowling Green" - looks like it was an awfully fast run by an amazing car! Congrats on a great run, and thanks for sharing!
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Old 05-23-2019, 06:42 PM
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Good times - I gotta get down there and check it out. I am up in the DFW area.

D.
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Old 05-23-2019, 09:05 PM
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Thanks for posting. Glad you are enjoying that beast. What is a 4-point dot safety belt? Also what do you have for a roll bar? Do you have pics? Also was considering getting a new shifter and will look at the lg shifter. I really enjoyed your video from the roll bar mount.

Ken
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Old 05-23-2019, 09:19 PM
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Originally Posted by Basil2000 View Post
Thanks for posting. Glad you are enjoying that beast. What is a 4-point dot safety belt? Also what do you have for a roll bar? Do you have pics? Also was considering getting a new shifter and will look at the lg shifter. I really enjoyed your video from the roll bar mount.

Ken
Thanks! Itís actually a harness bar, a shark bar. Iím using a Scroth Hans 5-point belt but only 4-points. Iím about to cut a slit in the back of the seat and run the bottom part of the harness so I can use all 5-points. I really need the extra support in this car. No way can you drive this car at the limit without belts, you will move around like crazy and lose focus.
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Old 05-24-2019, 12:19 AM
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Great info and videos! Thanks for sharing.

What do you recommend for toe for the front and rear?
What did you notice as a difference with the addition of the Katech ported TB?

Thanks, Bob
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Old 05-24-2019, 11:07 AM
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Awesome videos, thanks for sharing. And after having just finished Spring Mountain, I gotta say great driving skills. Looks like everything they taught us and much more. The video on the harness bar was my favorite. I liked being able to see you steering inputs. Seems like you gotta have fast hands with that much HP coming out of turns.
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Old 05-24-2019, 10:00 PM
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OP different results from what people with a8s have been posting. After seeing the performance of the a8 in the c7z and the regular c7, I'd opt for a manual too.

**edit, I meant regular c7

Last edited by serpent; 05-24-2019 at 10:45 PM.
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Old 05-24-2019, 10:41 PM
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Originally Posted by serpent View Post
OP different results from what people with a8s have been posting. After seeing the performance of the a8 in the c7z and the regular c8, I'd opt for a manual too.
Automatics/A8s will net the quickest lap time, for the most part but Iím more talking about the gear ratio differences and weight differences from the M7 and A8. I remember back in 2016, I had my bone stock M7 Z07 and pulled about 4 cars on this other Z06 A8. I find out he was modded and I was shocked but also knew deep down that a good driver that can lay down power in the M7, can be quicker on acceleration.

Iíve done some wild laps in A8 cars but of course personally want the M7
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Old 06-06-2019, 08:44 PM
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Originally Posted by Bob U View Post
Great info and videos! Thanks for sharing.

What do you recommend for toe for the front and rear?
What did you notice as a difference with the addition of the Katech ported TB?

Thanks, Bob
PM for my alignment spec suggestions. The Katech ported TB increased throttle response, blower wine, feels faster from the seat, honestly is just as smooth as stock or might be smoother now at partial throttle inputs. The M7 will react poorly at low speeds with a over ported TB. The Katech TB is perfect...I had some bad experiences with other ported TBs on my Z07 LT4 M7 at low speed conditions.
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Old 06-06-2019, 09:52 PM
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Originally Posted by SilveradoSS500 View Post
PM for my alignment spec suggestions. The Katech ported TB increased throttle response, blower wine, feels faster from the seat, honestly is just as smooth as stock or might be smoother now at partial throttle inputs. The M7 will react poorly at low speeds with a over ported TB. The Katech TB is perfect...I had some bad experiences with other ported TBs on my Z07 LT4 M7 at low speed conditions.
Thanks for the feedback on the TB. Iíll call them tomorrow. Iíll PM you about alignment.
Thanks, Bob
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Old 06-06-2019, 10:03 PM
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Thanks for sharing and nice runs.
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Old 06-08-2019, 09:03 PM
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Steering wheel loose unfortunately seems like a common zr1 problem which impacts some cars and not others but when it happens, there is no solution. My car has been at the dealer for 6 weeks now being repaired for various things, steering wheel being one issue.

The entire column assembly including telescope has been replaced in my car under the supervision of a corvette field specialist and column is still loose. Service manager keeps asking GM what to do, GM has no answer. I suspect some tolerances are too loose in zr1 and some unlucky cars are just unlucky.

But dont expect the loose column to be a ďsimple fixĒ. It isnt.
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Old 06-09-2019, 07:00 AM
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Originally Posted by UnhandledException View Post
Steering wheel loose unfortunately seems like a common zr1 problem which impacts some cars and not others but when it happens, there is no solution. My car has been at the dealer for 6 weeks now being repaired for various things, steering wheel being one issue.

The entire column assembly including telescope has been replaced in my car under the supervision of a corvette field specialist and column is still loose. Service manager keeps asking GM what to do, GM has no answer. I suspect some tolerances are too loose in zr1 and some unlucky cars are just unlucky.

But dont expect the loose column to be a ďsimple fixĒ. It isnt.
I felt a shift in the column on track. I took the airbag out because I thought the steering wheel came loose, maybe not properly torqued. Noticed the column had failed...they put a new column in my car in a few hours. I went out of town, picked up the car last Friday. Steering column now makes squeaky sounds while it turns, horn doesnít work ANDDDDDDD the icing on the cake, you ready, one of my head lights is delaminating. So, whole front end will be coming off for the headlight swap, it was coming off anyways for some factory fender damage we are about to address!

Maybe parts suppliers are trying to cut costs for the last round of C7 production?? Headlights coming apart, steering columns failing... Iíve never ever seen these issues on previous year C7s. My 2015 Z07 was a ROCK.

All that aside, this car is fast!

Last edited by SilveradoSS500; 06-09-2019 at 11:43 AM.
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Old 06-09-2019, 01:45 PM
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Originally Posted by SilveradoSS500 View Post
I felt a shift in the column on track. I took the airbag out because I thought the steering wheel came loose, maybe not properly torqued. Noticed the column had failed...they put a new column in my car in a few hours. I went out of town, picked up the car last Friday. Steering column now makes squeaky sounds while it turns, horn doesnít work ANDDDDDDD the icing on the cake, you ready, one of my head lights is delaminating. So, whole front end will be coming off for the headlight swap, it was coming off anyways for some factory fender damage we are about to address!

Maybe parts suppliers are trying to cut costs for the last round of C7 production?? Headlights coming apart, steering columns failing... Iíve never ever seen these issues on previous year C7s. My 2015 Z07 was a ROCK.

All that aside, this car is fast!
I dont think it has to do with suppliers. It has to do with the front end of the zr1 being completely different including the fenders, hood, and bumper. I also think it has to do with extra radiators. Something somewhere in assembly causing this looseness due to these new components being insufficiently tested due to small production run.
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