traction issues
07-17-2003, 03:20 AM
#1
Member
Thread Starter
Join Date: May 2003
Posts: 160
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Z28
Engine: 5.7L LT1
Transmission: 4L60
traction issues
I have a 1991 Z28. We just put a LT1/auto in the car. Also have 3.73's. Air intake, exhaust, stage 2 fast chip etc. I've tried launching the car a few times. Brake torqing is not going to happen. The car breaks loose and spins like crazy. Launching from idle spins but not as bad as I thought it would. It definately pulls harder from idle, front end jumps right up! I was thinking of going to Nitto drag radials but am worried about blowing the 7.5 rear end. should I be concerned, and how should I launch this car? I have firestone firehawks on the car right now. Thanks!
07-17-2003, 06:03 AM
#2
Supreme Member
iTrader: (1)
Join Date: Apr 2002
Location: Waterloo, Iowa
Posts: 4,671
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
Transmission: Oldani TH400 w/ BTE 9" convertor
Axle/Gears: 31 spline Moser/full spool/4.11Rich
Factory rear longvity is kinda of a trick question when you start putting power to it and traction. Some guys frag them for no good reason and others like me have had pretty good luck so far-knock on wood. Second season racing with this factory rear, consistent 1.80 shorts, I'm not 100% confident with this rear as I'm just waiting for that time when it let's go, but so far so good.
07-17-2003, 07:48 AM
#3
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 35 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Stiffening rear cover and welded tubes go a long way in helping them last. Any hint of wheel hop must be eliminated (poly bushings, boxed or tube LCAs).
07-17-2003, 07:34 PM
#4
Moderator
Join Date: Jul 1999
Location: 51°N 114°W, 3500'
Posts: 17,120
Likes: 0
Received 123 Likes
on
104 Posts
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
I ran mid to low 11's on a modified 7.5". Solid rear cover with bearing cap supports. Solid crush sleeve. Welded tubes. Aftermarket 28 spline axles. 4.10 gears.
I was getting low 1.7x 60' times and ran it for about half a season. I switched to a 9" when I installed a transbrake.
I was getting low 1.7x 60' times and ran it for about half a season. I switched to a 9" when I installed a transbrake.
Thread
Thread Starter
Forum
Replies
Last Post