[Z06] Gear Help
Thread Starter
Racer
Joined: Apr 2008
Posts: 332
Likes: 0
From: Arizona
Gear Help
Im thinking about going with 390's any comments or input would be appreciated. Car is a 02 Z06 with STS twin turbos. Power at the wheels just over 500. Currently have stock gears.
Le Mans Master
Joined: May 2007
Posts: 5,393
Likes: 17
From: Belleville Mich.
Wrong Way?
Itsphonix, that's a call, only you can determine. This spring,with my 03 Z. I went from stock to 3:90 . Didn't really feel much difference. I'm @ 400 rwhp. 11 sec. in 1/4 mi, before gear change. Havn't raced w/ new gearing yet. I imagine maybe 1 or 2 tenths better? That said, now wishing I had gone w/ 4:10's. With your HP @ 100 more than I, and maybe your looking at some more future HP? You may want to reduce your rear gearing or go to an M6 instead of the M12.
Last edited by bumble-z; Sep 26, 2009 at 12:49 PM.
Le Mans Master
Joined: May 2007
Posts: 5,393
Likes: 17
From: Belleville Mich.
Quicksilver, you may want to jump to the 4:10's. You'll be able to get a better ET. and be able to have a better seat of the pants feel. Your going to have to go w/ a good set of strip tires(drag radials) and install a diff/trans strut brace to keep any possible damage to a minimum. Good luck.
Race Director
Joined: Nov 2004
Posts: 15,678
Likes: 1,097
From: birmingham Alabama
St. Jude Donor '09 and '13
With more gear, you are going to blow the tires off of the rear of the car. You will LOSE traction with more gear, unless you tub out the rear and put some huge tires on the back. Your car has 3.45's, which is perfect with your TT setup. I have the stock 3.45's in my TT, and I love it.
Instructor
Joined: May 2009
Posts: 230
Likes: 0
From: Clarkston MI
If you're consering changing the gears this chart is very helpful. You can enter the gear, tire size etc and it will tell you at what rpm/speed each gearshift and crusing rpm in 6th gear.
http://xse.com/leres/bin/gearratio?t...diameter=25.21
While you might have more traction issues in the lower gears as meadowz06 mentioned but you can pedal the throttle, it's not an on/off switch. The gears should help most up top. Based on my calculations I'll be switching to a 3.90 as it would put me right in the powerband throughout 4th in the 1/4 mile.
http://xse.com/leres/bin/gearratio?t...diameter=25.21
While you might have more traction issues in the lower gears as meadowz06 mentioned but you can pedal the throttle, it's not an on/off switch. The gears should help most up top. Based on my calculations I'll be switching to a 3.90 as it would put me right in the powerband throughout 4th in the 1/4 mile.
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