Z51 axle ratio
08-22-2019, 09:13 AM
#101
Guys... put the moron on your ignore list and move on. He doesn't stop.
The following users liked this post:
JerryU (08-22-2019)
08-22-2019, 10:28 AM
#102
Safety Car
If you do the math assuming 1:1 trans gear, at 475lbft there will be about 90lbft difference at the wheels
I might be incorrect but 90lb on a 3.62 would be the same as adding 24lbft of tq at the rear wheel if you kept the 3.62...
gearing like high stall converters benefits can be hard to visualize until you run it at the drag or a 0-16 0-100 test. My opinion of course, but remember the c6zr1 achieved 205 in 6th gear and when gm changed
the gearing to match the z06, if memory serves me right the zr1 would slow
down if put in 6th during a top end run.
I might be incorrect but 90lb on a 3.62 would be the same as adding 24lbft of tq at the rear wheel if you kept the 3.62...
gearing like high stall converters benefits can be hard to visualize until you run it at the drag or a 0-16 0-100 test. My opinion of course, but remember the c6zr1 achieved 205 in 6th gear and when gm changed
the gearing to match the z06, if memory serves me right the zr1 would slow
down if put in 6th during a top end run.
Last edited by mirage2991; 08-22-2019 at 10:29 AM.
08-22-2019, 12:00 PM
#103
Melting Slicks
If the cars is .3 quicker to 60 mph, it will be .3 quicker in the 1/4 mile. Like the difference between 12.0 and 11.7, that is significant or 3 car lengths in the 1/4 mile.
08-22-2019, 04:13 PM
#104
Race Director
Member Since: Dec 2006
Location: Fort Worth, Texas
Posts: 11,135
Received 2,061 Likes
on
1,313 Posts
I hear ya, but who says it’s .3 faster to 60? If it is, then it’s not just the gears making that happen is all I’m saying.
08-22-2019, 05:11 PM
#105
Melting Slicks
I would bet the 0-60 time on a base C8 and a Z51 C8 is going to be 3 tenths difference. Much more tire grip and more gear should do it. Even if its only .2 difference, it will be couple of car lengths.
08-22-2019, 06:45 PM
#107
Premium Supporting Vendor
That's not Brad aka @Subdriver . I still see Brad at VIR as he's racing ST2 with NASA, but he rarely comes on here.
@Sub Driver is a different guy.
@Sub Driver is a different guy.
Given my work schedule, family commitments, and trying to race when I can, I don't post often anymore - but I am on the forum almost daily either answering PMs or looking up info. Just got to Mid-Ohio for a NASA ST2 race and plan on making the NASA Championships here 18-22 Sept.
Sorry for the hijack and back to the debate on gearing (which I will abstain from joining in on).
__________________
C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Ordering Information (Retail sales using reference #1206638 benefit the forum.)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
AMSOIL Catalog
C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Ordering Information (Retail sales using reference #1206638 benefit the forum.)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
AMSOIL Catalog
The following 2 users liked this post by C66 Racing:
RapidC84B (08-22-2019),
xcaliber501 (08-22-2019)
08-22-2019, 07:09 PM
#108
Banned Scam/Spammer
08-22-2019, 09:18 PM
#110
Race Director
Member Since: Dec 2006
Location: Fort Worth, Texas
Posts: 11,135
Received 2,061 Likes
on
1,313 Posts
.2 in the 1/4 may be 2 car lengths if traveling 120mph, but .2 at 60mph is 17.6’ or basically one car length as it’s half the speed. If the surface is prepped then the softer tire doesn’t necessarily have as much of an advantage if any. Then it comes down to the suspension possibly giving a traction advantage, the NPP, the launch control or trans gearing possibly being more aggressive.
08-22-2019, 09:36 PM
#111
I can't believe you guys are having such a heated argument over this.
The reason Chevy went from 3.62 to 3.80 gears on the Z51 is trivially simple.
The Z51 PS4 tires likely can handle ˜5% more torque off the line (from say 1.00g to 1.05g), therefore, since they were changing from mech LSD to eLSD anyway, they specced the optimal gearing for both applications. Simple as that.
It is not a *huge* difference. It is a marginal difference. But in a competitive market, ˜0.5g of linearly acceleration, particularly when it comes at no extra cost (the eLSD had to pick a gearing ratio anyway) is not to be thrown out.
Can you feel it? I think the better gearing, combined with the faster locking eLSD can be felt by SOME people, SOME of the time.
The reason Chevy went from 3.62 to 3.80 gears on the Z51 is trivially simple.
The Z51 PS4 tires likely can handle ˜5% more torque off the line (from say 1.00g to 1.05g), therefore, since they were changing from mech LSD to eLSD anyway, they specced the optimal gearing for both applications. Simple as that.
It is not a *huge* difference. It is a marginal difference. But in a competitive market, ˜0.5g of linearly acceleration, particularly when it comes at no extra cost (the eLSD had to pick a gearing ratio anyway) is not to be thrown out.
Can you feel it? I think the better gearing, combined with the faster locking eLSD can be felt by SOME people, SOME of the time.
Last edited by baron95; 08-22-2019 at 09:37 PM.
The following users liked this post:
PRE-Z06 (08-22-2019)
08-22-2019, 10:11 PM
#112
You are so right!
Also why do people want a supercar with all season tires and smaller brake rotors and calipers and non adjustable sound of the exhaust?
If you do not like the Z51 rear spoiler you can always take it off or install an aftermarket one because the holes will already be there.
The better gearing and faster 0 to 60 and ESLD are the icing on the cake and all worth the extra $5k for the Z51 package.
Also why do people want a supercar with all season tires and smaller brake rotors and calipers and non adjustable sound of the exhaust?
If you do not like the Z51 rear spoiler you can always take it off or install an aftermarket one because the holes will already be there.
The better gearing and faster 0 to 60 and ESLD are the icing on the cake and all worth the extra $5k for the Z51 package.
08-22-2019, 10:25 PM
#113
Race Director
Member Since: Dec 2006
Location: Fort Worth, Texas
Posts: 11,135
Received 2,061 Likes
on
1,313 Posts
I am raising my hand. That is the exact car I want. A supercar with all season tires and smaller brake rotors and non adjustable sound because this car will be used on remote western roads at extremely high RPM, noise will not be an issue. And as far as seat of the pants, I can easily feel the difference between a full tank of gas and a half a tank, so the debate on the the gear ratio will definitely be noticeable to those who truly drive this car as it is meant to be driven. Brakes are never an issue on public roads and the all season tires will put a trip up the ALCAN Highway right on the radar. Wish me luck, 10k miles on the new C8 Corvette before my first payment. Previously 5k on a Porsche Cayman GTS before first payment was made. All my cars end up in the junk yard, used and abused....haha.
08-22-2019, 10:33 PM
#114
Race Director
Member Since: Dec 2006
Location: Fort Worth, Texas
Posts: 11,135
Received 2,061 Likes
on
1,313 Posts
I can't believe you guys are having such a heated argument over this.
The reason Chevy went from 3.62 to 3.80 gears on the Z51 is trivially simple.
The Z51 PS4 tires likely can handle ˜5% more torque off the line (from say 1.00g to 1.05g), therefore, since they were changing from mech LSD to eLSD anyway, they specced the optimal gearing for both applications. Simple as that.
It is not a *huge* difference. It is a marginal difference. But in a competitive market, ˜0.5g of linearly acceleration, particularly when it comes at no extra cost (the eLSD had to pick a gearing ratio anyway) is not to be thrown out.
Can you feel it? I think the better gearing, combined with the faster locking eLSD can be felt by SOME people, SOME of the time.
The reason Chevy went from 3.62 to 3.80 gears on the Z51 is trivially simple.
The Z51 PS4 tires likely can handle ˜5% more torque off the line (from say 1.00g to 1.05g), therefore, since they were changing from mech LSD to eLSD anyway, they specced the optimal gearing for both applications. Simple as that.
It is not a *huge* difference. It is a marginal difference. But in a competitive market, ˜0.5g of linearly acceleration, particularly when it comes at no extra cost (the eLSD had to pick a gearing ratio anyway) is not to be thrown out.
Can you feel it? I think the better gearing, combined with the faster locking eLSD can be felt by SOME people, SOME of the time.
Last edited by PRE-Z06; 08-22-2019 at 10:34 PM.
08-22-2019, 11:19 PM
#115
True. One of the reasons I am so excited about getting this car is the engine. There is a Russian guy I believe on Youtube driving a C6 Z06 on the Ring, and the motor just sounds insane revved out! He ran a 7:17 BTG I believe; Denis Malevanyl Sept 18 2014, on Youtube
The following users liked this post:
Poorhousenext (08-24-2019)
08-23-2019, 12:05 AM
#117
Race Director
Member Since: Dec 2006
Location: Fort Worth, Texas
Posts: 11,135
Received 2,061 Likes
on
1,313 Posts
08-23-2019, 04:02 AM
#119
Base...…. 3.1 sec 0-60.... Top speed 194mph
Z51...…… 2.95 sec 0-60.... top speed 187mph
There's your difference in gearing and tires..... Is this really earth shattering? When you have 2 cars really close together it's about the driver at that point... You think .15 seconds is going to be noticeable? Hell that's if you could even get 2 people to launch at the exact same time…. What about different fuels being used, Tire pressure, Driver weight, Passenger or not and secondly none of this will mater once the Z06 comes out...
When I had my non Z51 Stingray on the road course a Z06 started 1/2 lap behind me.... After watching the video.. He was trying but he never caught me... Never even closed in to 1/4 track.. I'm no expert but I was obviously better than the Z06 driver who had 200 more HP..
Z51...…… 2.95 sec 0-60.... top speed 187mph
There's your difference in gearing and tires..... Is this really earth shattering? When you have 2 cars really close together it's about the driver at that point... You think .15 seconds is going to be noticeable? Hell that's if you could even get 2 people to launch at the exact same time…. What about different fuels being used, Tire pressure, Driver weight, Passenger or not and secondly none of this will mater once the Z06 comes out...
When I had my non Z51 Stingray on the road course a Z06 started 1/2 lap behind me.... After watching the video.. He was trying but he never caught me... Never even closed in to 1/4 track.. I'm no expert but I was obviously better than the Z06 driver who had 200 more HP..
The following users liked this post:
PRE-Z06 (08-23-2019)
08-23-2019, 03:55 PM
#120
Le Mans Master
What Aero!? ;)
Base...…. 3.1 sec 0-60.... Top speed 194mph
Z51...…… 2.95 sec 0-60.... top speed 187mph
There's your difference in gearing and tires..... Is this really earth shattering? When you have 2 cars really close together it's about the driver at that point... You think .15 seconds is going to be noticeable? Hell that's if you could even get 2 people to launch at the exact same time…. What about different fuels being used, Tire pressure, Driver weight, Passenger or not and secondly none of this will mater once the Z06 comes out...
When I had my non Z51 Stingray on the road course a Z06 started 1/2 lap behind me.... After watching the video.. He was trying but he never caught me... Never even closed in to 1/4 track.. I'm no expert but I was obviously better than the Z06 driver who had 200 more HP..
Z51...…… 2.95 sec 0-60.... top speed 187mph
There's your difference in gearing and tires..... Is this really earth shattering? When you have 2 cars really close together it's about the driver at that point... You think .15 seconds is going to be noticeable? Hell that's if you could even get 2 people to launch at the exact same time…. What about different fuels being used, Tire pressure, Driver weight, Passenger or not and secondly none of this will mater once the Z06 comes out...
When I had my non Z51 Stingray on the road course a Z06 started 1/2 lap behind me.... After watching the video.. He was trying but he never caught me... Never even closed in to 1/4 track.. I'm no expert but I was obviously better than the Z06 driver who had 200 more HP..
Last edited by johnglenntwo; 08-23-2019 at 03:55 PM.