Z51 gearing for road course work
Thread Starter
Melting Slicks
Joined: Aug 2017
Posts: 2,516
Likes: 942
From: Fl
Z51 gearing for road course work
Tadge said yesterday that the Z51 shifts twice by the time it gets to 60 mph. That eliminates any usefulness of 2nd on the track. With 6th gear probably a top speed gear and 7th and 8th for gas mileage that leaves 3-4-5 for track work. They’re going to be spread out pretty far.
Banned Scam/Spammer
Joined: Aug 2015
Posts: 3,166
Likes: 3,780
Melting Slicks
Joined: Aug 2014
Posts: 2,586
Likes: 873
The math was done in another thread, 3-4-5 will be very similar to current c6/c7 m7 cars 2-3-4 final ratios. It will be fine for track. With only 60ms b/w shifts, you should always be in the effective torque band for the engine.
Last edited by SladeX; Aug 26, 2019 at 01:12 PM.
Thread Starter
Melting Slicks
Joined: Aug 2017
Posts: 2,516
Likes: 942
From: Fl
Car is gonna fall flat on its face at 120 mph. Should be a rocket up to that point though.
Last edited by fatsport; Aug 26, 2019 at 06:11 PM.
Team Owner
Joined: May 2005
Posts: 20,160
Likes: 400
From: NY
St. Jude Donor '26
Maybe not. The z51 has a really deep rear end. 5.17 or something crazy. Probably packaging, they went with higher gears and a deeper rear end. Like mentioned before should be comparable to the C7 over-all ratios.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
7 Bolt-On Upgrades From Extreme Online Store to Level Up Your C6 Corvette
Pouria Savadkouei
Le Mans Master
Joined: Dec 2000
Posts: 9,891
Likes: 1,829
From: Hot Springs AR
Instructor
Joined: Feb 2019
Posts: 163
Likes: 107
From: Seattle
Tech Contributor
Joined: Jan 2015
Posts: 5,684
Likes: 1,449
Thread Starter
Melting Slicks
Joined: Aug 2017
Posts: 2,516
Likes: 942
From: Fl
4th in the C8 Z51 looks great, tops out at 118. 5th tops out at 158 though, still a 40 mph span. I don’t get it. You’ll never see a Porsche with a 40 mph gap. I guess GM feels different.
Last edited by fatsport; Aug 31, 2019 at 04:06 PM.
Tech Contributor
Joined: Jan 2015
Posts: 5,684
Likes: 1,449
I had a GS Z07, 4th was miserable. Felt like taking a nap on a straight. Got a point by from a Civic Type R and it took forever to get around him. A frikkin Civic. He did have E85 though, we had a good laugh between sessions.
5th in the C8 Z51 looks great, tops out at 118. 6th tops out at 158 though, still a 40 mph span. I don’t get it. You’ll never see a Porsche with a 40 mph gap. I guess GM feels different.
5th in the C8 Z51 looks great, tops out at 118. 6th tops out at 158 though, still a 40 mph span. I don’t get it. You’ll never see a Porsche with a 40 mph gap. I guess GM feels different.
Last edited by BrunoTheMellow; Aug 31, 2019 at 04:01 PM.
Thread Starter
Melting Slicks
Joined: Aug 2017
Posts: 2,516
Likes: 942
From: Fl
They’re track gears. Stink on the street but great for the track. Z51 is just the opposite. Car will be a rocket up to 118 with 4 gears(not 5, I corrected my previous post)but then will bog down.
Last edited by fatsport; Aug 31, 2019 at 04:05 PM.
Banned Scam/Spammer
Joined: Mar 2005
Posts: 8,083
Likes: 3,869
From: Bonita Springs FL
The gearing difference between Z51 and non is like 0.18 which is next to nothing as that stuff goes. Anyone who coughs 5 grand expecting a much harder accelerating C8 is going to disappointed. You might get 0-60 a tenth of a second faster which is something that you will never feel and not worth talking about. Wait for the Z06 if a significantly faster car is what you are after.
Instructor
Joined: Aug 2019
Posts: 127
Likes: 66
From: SE MASS, FREEDOM NH
GT4 gearing is tall and some do not like it. But for autocross it is also tall until you drive the snot out of it. If you can keep the speed up you can kick some butt. I have a few season wins at autocross with a GT4. Will see what the C8 does and as soon as mine has some smiles on it I will track the beast. Maybe not autocross at first, do not know yet. But for sure the stock tires/wheels will be saved for ?? Track will be on MPSC 2s. No desire to go to R comps. Maybe take the 3 season stock tires for rain days.
Safety Car
Joined: Nov 2007
Posts: 3,882
Likes: 2,933
From: N.E. Suburb MN
C8 z51 6th is stronger than 5th on the C7 z51 because of the diff. That being said after 1st they are very close, but 4-5-6 are the old 3-4-5.