|
10-02-2008, 02:20 PM
|
#1
|
10 Second Club
Join Date: Aug 2004
Location: Hatfield, PA
Posts: 1,292
|
car losing traction about 10 ft out of the hole
what would make my car hook good, but then about 10ft out of the hole it looses traction? I would like to get this hammered down so i can spray a 175-200 shot out of the hole.
car has all spohn rear end with rod links, -2 pinion angle, and also a x-duty sway bar.
28 x 11.50 slicks with a good burn at 16.5 psi
|
|
|
10-02-2008, 03:06 PM
|
#2
|
Join Date: May 2005
Location: under a roof
Posts: 2,034
|
what kind of shocks do do you have in the rear? I usually run 11-12lbs in my slicks.
__________________
1973 Chevy Nova - best e.t.-10.04 - currently disassembled
1989 Pontiac Trans Am GTA
2016 Dodge Durango R/T
2015 Ram 3500 Dually Cummins
Last edited by mc73nova; 10-02-2008 at 05:32 PM.
|
|
|
10-02-2008, 03:12 PM
|
#3
|
'08 East Coast Nats Best of Show
Join Date: Aug 2006
Location: Sellersville, PA
Posts: 97
|
I would try getting rid of those girlie tires and put some real rubber back there by tubbing it. Then that bitch will hook! HAHAHA!!!!!!
Last edited by Pro90rscam; 10-02-2008 at 03:13 PM.
|
|
|
10-02-2008, 03:26 PM
|
#4
|
Join Date: May 2005
Location: under a roof
Posts: 2,034
|
That tire should be more than enough. I 60' 1.40 on a 9" and have been 10.52@127.
__________________
1973 Chevy Nova - best e.t.-10.04 - currently disassembled
1989 Pontiac Trans Am GTA
2016 Dodge Durango R/T
2015 Ram 3500 Dually Cummins
|
|
|
10-02-2008, 07:24 PM
|
#5
|
Join Date: Feb 2005
Location: Orange County NY
Posts: 579
|
what shocks are in the car. drop the psi down to 13.5
__________________
2000 Camaro 25.5 Turbo car X275
|
|
|
10-02-2008, 09:01 PM
|
#6
|
10 Second Club
Join Date: Aug 2004
Location: Hatfield, PA
Posts: 1,292
|
BMR tubular front suspension with coil overs and lakewood 90/10 struts
rear is all spohn with lakewood 50/50's with stock springs
|
|
|
10-02-2008, 09:22 PM
|
#7
|
Sliderule / Moderator
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
|
If you can get a vid of the car launching and watch if the rear is unloading/rocking too much forward.
Try going -3 on the pinion, just to rule out some odd deflection if the angle goes to 0?
Somewhat common is that after the inital hit and the rear squats that as the shocks rebound it can rock back forward causing the rear to unload. if so put air bags in the springs and work with the pressure.
__________________
93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
|
|
|
10-02-2008, 09:31 PM
|
#8
|
Queen of Destruction / NJFBOA Supporting Sponsor / Moderator / 12 Second Club / 2006 Member of the Year / PITA
Join Date: Aug 2004
Location: I dunno..
Posts: 8,327
|
Quote:
Originally Posted by Pampered-Z
If you can get a vid of the car launching and watch if the rear is unloading/rocking too much forward.
Try going -3 on the pinion, just to rule out some odd deflection if the angle goes to 0?
Somewhat common is that after the inital hit and the rear squats that as the shocks rebound it can rock back forward causing the rear to unload. if so put air bags in the springs and work with the pressure.
|
listen to him. also, how far up are the wheels coming up? is it unloading when the wheels hit the ground? how old are the tires? definitely drop the psi down some.
also, very important, and you probably know, but only change ONE thing at a time. If you change too much and it still doesn;t work, you won't know if one thing would have fixed it and the other made it worse.
__________________
We're a drinking team with a racing problem.
|
|
|
10-02-2008, 09:31 PM
|
#9
|
10 Second Club
Join Date: Aug 2004
Location: Hatfield, PA
Posts: 1,292
|
i aways though that airbags hurt torque arm suspension launches?
|
|
|
10-03-2008, 05:57 AM
|
#10
|
NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
|
Quote:
Originally Posted by Pro90rscam
I would try getting rid of those girlie tires and put some real rubber back there by tubbing it. Then that bitch will hook! HAHAHA!!!!!!
|
Why don't you just trade him since that pop gun under your hood can't spin tires in snow. lol
|
|
|
10-03-2008, 11:21 AM
|
#11
|
NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
|
Two questions:
Are you lifting the fronts at the hit?
What are your front and rear suspension packages?
If the front tires are coming up, you may be getting something similar to limiter bounce. Time to put on your high school physics hat.
When the front tires come up, the front suspension drops down. Now remember, every action has an equal but opposite reaction, so when the front suspension "bounces" to a stop, it actually pulls load off of the rear tires.
Switching to lower rate, longer front springs, and front shocks with more travel can help with this kind of unloading.
-Tim
|
|
|
10-03-2008, 02:22 PM
|
#12
|
10 Second Club
Join Date: Aug 2004
Location: Hatfield, PA
Posts: 1,292
|
suspension mods are already listed above.
tires are barely coming off (like an inch)
|
|
|
10-03-2008, 02:38 PM
|
#13
|
11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,619
|
I had this happen to me.. turned out a broken sway bar bolt.
__________________
1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
|
|
|
10-03-2008, 09:50 PM
|
#14
|
Sliderule / Moderator
Join Date: Oct 2004
Location: Catawissa PA
Posts: 2,294
|
Quote:
Originally Posted by camaroracer1992
i aways though that airbags hurt torque arm suspension launches?
|
Your not going to be putting in so much air that it's going to raise the car or change the angle ( that is a common mistake ), you want just enough that it stiffens up the rear so the shocks don't compress down too far causing the suspensions angles to change drastically or that when the shocks uncompresses it pushes all the weight back onto the front tires.
__________________
93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
|
|
|
10-04-2008, 11:12 AM
|
#15
|
NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
|
Get a softer spring in the rear, like a stock V6 spring. Should let it sit and stay down better.
|
|
|
10-04-2008, 07:28 PM
|
#16
|
Token v6 Guy
Join Date: Sep 2004
Location: No longer neon land :(
Posts: 5,703
|
When I was spraying off the line and had the rear QA1's set to all loose this was happening.
As I tightened them up this gradually became less.
I ended up having the right rear shock set one less than the left rear and much better.
Lots of trial and error
__________________
2013 Dodge Challenger SRT8 - 12.079 at 116.45
2010 Ford Taurus SHO - stage 4+ tune and an intake - no times yet
|
|
|
10-05-2008, 12:59 PM
|
#17
|
Join Date: Jan 2005
Location: boonton
Posts: 639
|
i feel your pain man. i get consistant low 1.7 60s using the footbrake. forget about using the trans brake. i get mid 1.8s with the transbrake.
|
|
|
10-06-2008, 07:09 PM
|
#18
|
NJFBOA Supporting Sponsor
Join Date: Feb 2006
Location: HULMEVILLE, PA
Posts: 2,023
|
First off tire pressure is too high.
What is the weight bias of your car?
Spring rates front and rear?
__________________
JSSPEEDANDCUSTOM.COM
|
|
|
10-07-2008, 12:59 AM
|
#19
|
I <3 sheep
Join Date: Mar 2005
Location: Belmar
Posts: 4,907
|
Quote:
Originally Posted by NJSPEEDER
Get a softer spring in the rear, like a stock V6 spring. Should let it sit and stay down better.
|
QFT, and drop the pressure a little. Just make sure you have the wheel well clearance as the softer springs will allow the rear to squat more.
__________________
Quote:
Originally Posted by Tru2Chevy
Steve has a thing for sheep....
|
'78 Big Wheel- 2FWFP
Last edited by SteveR; 10-07-2008 at 01:00 AM.
|
|
|
08-13-2009, 06:52 PM
|
#20
|
Join Date: Aug 2009
Location: Newark Delaware
Posts: 37
|
Quote:
Originally Posted by camaroracer1992
about 10ft out of the hole it looses traction
|
Tighten the rear shocks. Loosen up the front.
__________________
1986 Camaro
1996 firehawk (crashed)
Retired NHRA driver
Frank...
|
|
|
08-13-2009, 07:22 PM
|
#21
|
Guest
|
holy year old post!!!
|
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
|
|