Have 3:42 gears thinking of going to 3:90 need imput?
12-02-2007, 08:28 AM
#2
TECH Addict
iTrader: (1)
Join Date: Sep 2007
Location: Orange Park Fl
Posts: 2,206
Likes: 0
Received 0 Likes
on
0 Posts
390 I got a lot more wheel spin (first & second useless on the street), about 2 mpg loss in mileage but all great at the track. I seemed to have picked up about .30 in the quarter mile (my sixty foot went from 1.64 to 1.489). I have had to hit the brakes before busting the 11.5 rule recently. Best new run was 11.52 at 91 mph (hit the brakes real hard at the end). Hope to run a complete run next Saturday. Pit-man
Last edited by pittman; 12-02-2007 at 10:04 AM.
12-02-2007, 07:10 PM
#4
11 Second Club
Join Date: Jun 2005
Location: Was New Orleans, but swam to Baton Rouge
Posts: 1,537
Likes: 0
Received 0 Likes
on
0 Posts
If you have a cam you will swear the car should have came with 3.90s. It works great for everyday driving, and my local road course the car is fast out of the turns.
12-03-2007, 04:11 AM
#6
TECH Regular
iTrader: (5)
Join Date: Sep 2005
Location: CA
Posts: 405
Likes: 0
Received 0 Likes
on
0 Posts
^ Lol, I just put some street tires on my FRC (wore out the Nitto DR's) and I can spin the damn tires in 5th 
S0 needless to say I just ordered some new DR's and my street tires are practically new 
99FRC...I dont know from personal experience, but I have heard the 3.90's are pretty sweet. Personally I've always liked stock gearing in all my cars, im more of a highway hunter so to speak.
S0 needless to say I just ordered some new DR's and my street tires are practically new 99FRC...I dont know from personal experience, but I have heard the 3.90's are pretty sweet. Personally I've always liked stock gearing in all my cars, im more of a highway hunter so to speak.
Trending Topics
12-04-2007, 10:45 AM
#11
11 Second Club
iTrader: (4)
Join Date: Jul 2005
Location: Ogden, Utah
Posts: 1,294
Likes: 0
Received 0 Likes
on
0 Posts
hes talking about the steeper gearing from 1-3 gear. basically it makes a normal C5 act like a Z06 gearing wise from 1-3 but it will have a gearing advantage once both hit 4th.
do you guys like 3.90's in your Z's??? i am leery going with a steeper gear in the rear with already steep trans gearing. is it worth it?
do you guys like 3.90's in your Z's??? i am leery going with a steeper gear in the rear with already steep trans gearing. is it worth it?
12-04-2007, 12:27 PM
#12
11 Second Club
Join Date: Jun 2005
Location: Was New Orleans, but swam to Baton Rouge
Posts: 1,537
Likes: 0
Received 0 Likes
on
0 Posts
I really like it and would not go back to the 3.42s. I am making close to 500 rwhp and 475 rwtq with my 383 stroker right now and I still love the 3.90s in the back. The car was meant to be with those gears. They make even leisure cruising in the Z fun. I know I can break the tires loose when I want to or just putt around.
12-04-2007, 04:19 PM
#13
I really like it and would not go back to the 3.42s. I am making close to 500 rwhp and 475 rwtq with my 383 stroker right now and I still love the 3.90s in the back. The car was meant to be with those gears. They make even leisure cruising in the Z fun. I know I can break the tires loose when I want to or just putt around.
12-04-2007, 04:52 PM
#14
On The Tree
Join Date: Aug 2007
Posts: 185
Likes: 0
Received 0 Likes
on
0 Posts
I have 3:90's and all I can say is they are awsome.... It takes a little more effort to launch and not break the tires lose but love it anyways.... 80mph on the highway 2500 RPM... No more 200mph runs though )-:
12-04-2007, 04:55 PM
#15
I went from 3.42's to 3.90's last spring. Over the summer with my Goodyear GS-D3's, they were hard to break loose from a roll. Now that its cold (car is away now) they break loose easily in 1st and 2nd. I have 396 hp. In the spring I am doing new heads and a different cam so I am sure that breaking them loose in hot weather will not be an issue. The only thing I can add is I wish I put them in a long time ago. 6th gear on the highway is much better, 3rd gear will pin you in the seat, 2nd gear is holy crap time and 1st is usually when the wife begins the scream. She is usually out of breath by third though 
12-04-2007, 07:17 PM
#16
11 Second Club
Join Date: Jun 2005
Location: Was New Orleans, but swam to Baton Rouge
Posts: 1,537
Likes: 0
Received 0 Likes
on
0 Posts
12-04-2007, 11:03 PM
#17
Launching!
Thread Starter
Join Date: Feb 2005
Location: Central California
Posts: 228
Likes: 0
Received 0 Likes
on
0 Posts
Made the decision to get the 3.90's put my deposit down this morning being installed a week from Saturday. The work is being done by Rick at Synergy.
Can't wait
Can't wait
12-05-2007, 02:53 AM
#18
TECH Regular
iTrader: (5)
Join Date: Sep 2005
Location: CA
Posts: 405
Likes: 0
Received 0 Likes
on
0 Posts
Well keep us posted. I will have to go to LB one of these days and meet up with you. Well once I get it up and running again Lol, my clutch is slipping pretty bad so I ordered a Mcleod Twin Disk, so in a couple weeks when it comes in it will be back on the road, so in the meantime I have to drive the Z06 (LOL)
Lol, my clutch is slipping pretty bad so I ordered a Mcleod Twin Disk, so in a couple weeks when it comes in it will be back on the road, so in the meantime I have to drive the Z06 (LOL)
12-05-2007, 06:08 AM
#19
Good choice I went to a 3.90 a few months ago and definately think any one should do it. Unless over like 700 whp!
I have 2 in car videos below before and after they are not exactly from the same start and stop points but you kind of get the idea
3.42 30-105 run
http://videos.streetfire.net/video/9...a2013d33b9.htm
3.90 20-130 run
http://videos.streetfire.net/video/a...e001607f98.htm
I have 2 in car videos below before and after they are not exactly from the same start and stop points but you kind of get the idea
3.42 30-105 run
http://videos.streetfire.net/video/9...a2013d33b9.htm
3.90 20-130 run
http://videos.streetfire.net/video/a...e001607f98.htm
12-05-2007, 06:28 PM
#20
On The Tree
Join Date: Aug 2007
Posts: 185
Likes: 0
Received 0 Likes
on
0 Posts
YOU SHOULD WAIT ON THE GEARS UNTIL YOU GET THE CLUTCH>... Save money on isntall...
I am pretty sure.... For the gears they have to drop the whole tq tube assembly and will have to do it all over again for the clutch.... Might save you some money to do it all at once with the car already apart. (-:
I am pretty sure.... For the gears they have to drop the whole tq tube assembly and will have to do it all over again for the clutch.... Might save you some money to do it all at once with the car already apart. (-: