Re: Launch dilema
[Re: 7sec.cuda]
#1097605
10/19/11 05:32 PM
10/19/11 05:32 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Have you tried raising your wheelie bars some so it will transfer more EDIT I assume this is a 4 link... whats the length and height
Last edited by MR_P_BODY; 10/19/11 05:37 PM.
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Re: Launch dilema
[Re: 7sec.cuda]
#1097609
10/19/11 06:01 PM
10/19/11 06:01 PM
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Joined: Dec 2005
Posts: 872 NJ
SSDAcuda
super stock
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super stock
Joined: Dec 2005
Posts: 872
NJ
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Raising wheelie bar won't help, its not even trying to transfer, let alone hitting the bar.
Have you checked your tire gauge against another. Slicks look like radials to me…
Did you try loosening front shock extension?
SS/DA 1924
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Re: Launch dilema
[Re: SSDAcuda]
#1097611
10/19/11 06:05 PM
10/19/11 06:05 PM
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Joined: Dec 2005
Posts: 872 NJ
SSDAcuda
super stock
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super stock
Joined: Dec 2005
Posts: 872
NJ
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Maybe try softening rear compression also. What # spring on the rear? Where is the IC of the four link?
SS/DA 1924
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Re: Launch dilema
[Re: SSDAcuda]
#1097612
10/19/11 07:03 PM
10/19/11 07:03 PM
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Joined: Apr 2004
Posts: 12,339 somwhere
smokinwoody
I Live Here
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I Live Here
Joined: Apr 2004
Posts: 12,339
somwhere
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Quote:
Maybe try softening rear compression also. What # spring on the rear? Where is the IC of the four link?
watching the vids, and seeing the bouncing, looks like the springs are too stiff, tires looked hard or over inflated...
maybe a change in the 4 link setup...
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Re: Launch dilema
[Re: 7sec.cuda]
#1097613
10/19/11 07:46 PM
10/19/11 07:46 PM
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Joined: Jan 2003
Posts: 1,624 Orange County, Ca.
B1CUDA
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,624
Orange County, Ca.
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Have you changed anything in the suspension since it was last out? If not, here is my .02
I had the same PS Hemi in the car I just sold, and I know how finnicky they can be. I would start by taking timing out of it, at the hit, so that you can get the car to leave (although it may be a pooch to start off), and than start ramping the timing back in, as you get the chassis figured out. I would share my old launch RPM settings, etc., but, with your big tire, I am sure that your settings are far more agressive.
Do you have a Racepak? If so, what has the driveshaft rpm been in the past, at the 1 second mark? I would back it down with timing, than sneak back up to where the graph is showing it's happiest point.
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Re: Launch dilema
[Re: 7sec.cuda]
#1097614
10/19/11 07:48 PM
10/19/11 07:48 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I didnt see a vid the first time I looks... but looking now and seeing it, it looks like the springs are real stiff and it looks like the tire pressure is high... do you know what the IC is... whats the weight (front and rear)
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Re: Launch dilema
[Re: 7sec.cuda]
#1097615
10/19/11 07:49 PM
10/19/11 07:49 PM
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Joined: Nov 2009
Posts: 3,410 Belpre,Ohio
CHAPPER
master
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master
Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
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If I had a car that was leaving with some 1.teens,,and then started acting like that,,,I'm not sure what I would do..!! You are spinning the tires on the line easier than I can in the water box..!! Hard to tell from videos, but appears the tires might have WAY to much air for some reason, if that is possible...I suppose the tires are still 'decent' for this time of the season..? That is surely amazing that this would happen over 5* temperature. I can't give you any info on 4 link suspension,,I can't even get my ladder bar sled to work like I want it to.. But, that is one of the most frustrating launches I have ever seen.
If you like drag racing, support your local track.
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Re: Launch dilema
[Re: 7sec.cuda]
#1097617
10/19/11 08:03 PM
10/19/11 08:03 PM
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Joined: Apr 2004
Posts: 12,339 somwhere
smokinwoody
I Live Here
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I Live Here
Joined: Apr 2004
Posts: 12,339
somwhere
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Quote:
we thought we had tire issues so we just bought new ones beginning of year these only have bout 15 runs like i said its amazing when its hot the car 60fts awesome but get colder the car is a different animal
what are the tires and compound rating..
are they Goodyear's D compound?
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Re: Launch dilema
[Re: 7sec.cuda]
#1097618
10/19/11 08:06 PM
10/19/11 08:06 PM
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Joined: Nov 2003
Posts: 10,384 Upstate NY
Bigcube
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,384
Upstate NY
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Could it have been the track prep at LVD? I know Shakedown was off the hook, I've only been to LVD a few times and the prep was never stellar. I agree with the rest, something in the back seems way too stiff, could the shocks be frozen up?
Jim
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Re: Launch dilema
[Re: Bigcube]
#1097620
10/19/11 08:10 PM
10/19/11 08:10 PM
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Joined: Jun 2007
Posts: 478 Stratford,Ct
7sec.cuda
OP
mopar
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OP
mopar
Joined: Jun 2007
Posts: 478
Stratford,Ct
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Jim brand new shocks,springs front and rear chasis gone over front to back twice this year car works excellent when hot does not work in cold weather .track prep wasnt the best but i had same issues at shakedown
Last edited by 7sec.cuda; 10/19/11 08:11 PM.
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