Full ZR1 Article:
11-08-2017, 03:46 PM
#21
Race Director
Notice the front fenders are wiser as well and don't require the black lip...GM spent a ton of money on this new zr1. This does not seem like a 18 month run.
The idea of a two year or more extended run makes a lot more sense for the front engine rear drive c7.
I wonder if that massive rear wing can be easily dismounted and mounted for track days. On the street it's ridiculous for many of us. Even the smaller less track ready rear wing is over the top...
Still..over all the zr1 looks awesome..the tech is off the chart...notice the m7 and the A8 are the transmissions. MRC shocks included... big money was spent here developing this car....new front fenders ..new hood. New front fascia, new rear wing attachment points.
New supercharger, altered internals to handle the power increase.
Excellent read...I have a subscription to car and driver but have not received it yet.
This years lightning lap should be insane.
2.5 seconds quicker than the z06 which is already a track champion....
Well done
The idea of a two year or more extended run makes a lot more sense for the front engine rear drive c7.
I wonder if that massive rear wing can be easily dismounted and mounted for track days. On the street it's ridiculous for many of us. Even the smaller less track ready rear wing is over the top...
Still..over all the zr1 looks awesome..the tech is off the chart...notice the m7 and the A8 are the transmissions. MRC shocks included... big money was spent here developing this car....new front fenders ..new hood. New front fascia, new rear wing attachment points.
New supercharger, altered internals to handle the power increase.
Excellent read...I have a subscription to car and driver but have not received it yet.
This years lightning lap should be insane.
2.5 seconds quicker than the z06 which is already a track champion....
Well done
11-08-2017, 03:46 PM
#22
Le Mans Master
I was hoping that the ZR1's LT5 would be a 32 valve twin over head cam mill. From what I see this new ZR1 is basically Callaways 757 Z06 without the spats. I still like it though, but without the large wing (ZTK performance pkg)
Last edited by Supersonic 427; 11-08-2017 at 03:53 PM.
11-08-2017, 03:53 PM
#23
Team Owner
The European thing is referring to the "Ped Pro" or Pedestrian protection test. This is the reason the Z06 over heats in my opinion. When they supercharged the Z06, they likely considered a blower the same size as the one on the C6 ZR1, but it was too tall so it wouldn't allow enough clearance to pass this new European test. Instead, they used a smaller 1.7L supercharger spun faster to allow sufficient gap between the supercharger cover and the hood. This way when a head hits the hood, the hood has some give before hitting the cover. Unfortunately, the 1.7L blower is spinning out of it's efficiency range generating much of the heat that plagues the Z06.
I suspected they would use a larger blower for the C7 ZR1 to keep things cool. If they pushed the 1.7L further, it would only make the existing problem worse. This article seems to confirm that. "Like the Z06’s engine, this one is capped by an Eaton supercharger. The blower is bigger than the LT4s pumping 52 percent more air with each revolution, and taller by 2.9 inches." Does that mean the blower is 2.6L?
Also of note, is that the hood has a cut out in it. The supercharger cover peeking out is fixed to the top of the supercharger. This likely helps reduce height and increase visibility but still won't pass the European pedestrian test. It will be interesting to see if the aftermarket offers a clear cover replacement reminiscent of C6 ZR1.
Also, if those with Z06s are able to swap to this blower hood and cover, they could get a power bump and a blower that that is properly sized.
I suspected they would use a larger blower for the C7 ZR1 to keep things cool. If they pushed the 1.7L further, it would only make the existing problem worse. This article seems to confirm that. "Like the Z06’s engine, this one is capped by an Eaton supercharger. The blower is bigger than the LT4s pumping 52 percent more air with each revolution, and taller by 2.9 inches." Does that mean the blower is 2.6L?
Also of note, is that the hood has a cut out in it. The supercharger cover peeking out is fixed to the top of the supercharger. This likely helps reduce height and increase visibility but still won't pass the European pedestrian test. It will be interesting to see if the aftermarket offers a clear cover replacement reminiscent of C6 ZR1.
Also, if those with Z06s are able to swap to this blower hood and cover, they could get a power bump and a blower that that is properly sized.
It is the lack front air flow the bumper cover area is not enough thus the open ZR1 bumper cover with a lot of coolers.
11-08-2017, 03:56 PM
#24
Drifting
The European thing is referring to the "Ped Pro" or Pedestrian protection test. This is the reason the Z06 over heats in my opinion. When they supercharged the Z06, they likely considered a blower the same size as the one on the C6 ZR1, but it was too tall so it wouldn't allow enough clearance to pass this new European test. Instead, they used a smaller 1.7L supercharger spun faster to allow sufficient gap between the supercharger cover and the hood. This way when a head hits the hood, the hood has some give before hitting the cover. Unfortunately, the 1.7L blower is spinning out of it's efficiency range generating much of the heat that plagues the Z06.
I suspected they would use a larger blower for the C7 ZR1 to keep things cool. If they pushed the 1.7L further, it would only make the existing problem worse. This article seems to confirm that. "Like the Z06’s engine, this one is capped by an Eaton supercharger. The blower is bigger than the LT4s pumping 52 percent more air with each revolution, and taller by 2.9 inches." Does that mean the blower is 2.6L?
Also of note, is that the hood has a cut out in it. The supercharger cover peeking out is fixed to the top of the supercharger. This likely helps reduce height and increase visibility but still won't pass the European pedestrian test. It will be interesting to see if the aftermarket offers a clear cover replacement reminiscent of C6 ZR1.
Also, if those with Z06s are able to swap to this blower hood and cover, they could get a power bump and a blower that that is properly sized.
I suspected they would use a larger blower for the C7 ZR1 to keep things cool. If they pushed the 1.7L further, it would only make the existing problem worse. This article seems to confirm that. "Like the Z06’s engine, this one is capped by an Eaton supercharger. The blower is bigger than the LT4s pumping 52 percent more air with each revolution, and taller by 2.9 inches." Does that mean the blower is 2.6L?
Also of note, is that the hood has a cut out in it. The supercharger cover peeking out is fixed to the top of the supercharger. This likely helps reduce height and increase visibility but still won't pass the European pedestrian test. It will be interesting to see if the aftermarket offers a clear cover replacement reminiscent of C6 ZR1.
Also, if those with Z06s are able to swap to this blower hood and cover, they could get a power bump and a blower that that is properly sized.
11-08-2017, 04:02 PM
#25
Race Director
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St. Jude Donor '16-'17,'22,'24
I wonder how much they have to pay the "volunteers"?
11-08-2017, 04:57 PM
#26
There are a multiple compound issues with Z06 cooling really, but they start with the extra heat that needs dissipated in the first place. You're correct though that there are air flow issues with the C7 Z06. This just exacerbates the problem. Putting a better breathing bumper on the Z06 alone wouldn't fully solve the problem.
The ZR1 looks to have more than adequately addressed this problem both by reducing creation of heat (larger more efficient blower) and also improving heat dissipation (better coolers, imported air flow etc). I'm guessing GM didn't want another embarrassment so the C7 ZR1 likely received a lot of special attention in this area.
11-08-2017, 05:01 PM
#27
Team Owner
11-08-2017, 05:12 PM
#29
Clearly both the C6 and C7 ZR1 would fail the Euro tests with the hard supercharger covers. The splitters don't look very leg friendly either. At least we have good carbon ceramic brakes that hopefully prevent us from hitting people in the first place.
Last edited by CloudLS9; 11-08-2017 at 05:12 PM.
11-08-2017, 05:22 PM
#30
Le Mans Master
11-08-2017, 10:06 PM
#31
Team Owner
11-09-2017, 03:48 AM
#33
Race Director
How many Europeans bought corvettes per year anyway...? Let them buy z06 s....
glad GM make the hood cool.
glad GM make the hood cool.
11-09-2017, 06:53 AM
#34
Racer
I like it. I'm just the biggest fan of the incredibly busy body style...it looks like a modern day batmobile, which is good and bad. lol.
i'm assuming with that kind of HP this car would make a mid 10 second pass pretty easily. Demon beater perhaps?
i'm assuming with that kind of HP this car would make a mid 10 second pass pretty easily. Demon beater perhaps?
11-09-2017, 07:32 AM
#35
Melting Slicks
Member Since: Jun 2005
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2018 C6 of Year Finalist
St. Jude Donor '10, '17
It is a road course car, not a 1/4 mile car and was not produced to compete with the Demon. You don't put a giant wing on a car and then run it down a drag strip, or at least you shouldn't. The factory sponsored C7R races in the IMSA racing series in the GTLM class, not the NHRA.
11-09-2017, 08:18 AM
#36
Charming.
11-09-2017, 08:56 AM
#38
2.5 seconds faster than the z06 at VIR sets a new lap record and faster than the ACR's precious record (2:38.8 zr1 vs 2:40.0 acr) - well done!
and despite it not being designed for the drag strip, I bet it will be comparable to most runs against a Demon (note no mags have come close to replicating the demons official hero run lap times).
This car will be trapping well over 130 mph too.
and despite it not being designed for the drag strip, I bet it will be comparable to most runs against a Demon (note no mags have come close to replicating the demons official hero run lap times).
This car will be trapping well over 130 mph too.
Last edited by Achmed; 11-09-2017 at 09:01 AM.
11-09-2017, 09:02 AM
#39
It is a road course car, not a 1/4 mile car and was not produced to compete with the Demon. You don't put a giant wing on a car and then run it down a drag strip, or at least you shouldn't. The factory sponsored C7R races in the IMSA racing series in the GTLM class, not the NHRA.
11-09-2017, 09:16 AM
#40
The ZR1 should be significantly better past 100mph than the Z06 though. That's what I'm looking forward to. It should be able to drop below 7 minutes at the ring with the new aero setup.