Re: 60' still stinks
[Re: sshemi]
#1779393
03/15/15 01:08 AM
03/15/15 01:08 AM
|
Joined: Jul 2012
Posts: 430 Washington
skrews
mopar
|
mopar
Joined: Jul 2012
Posts: 430
Washington
|
Quote:
Looks like front susp tops out too fast.
X2 Not enough travel IMO.
|
|
|
Re: 60' still stinks
[Re: weedlayer]
#1779395
03/15/15 11:43 AM
03/15/15 11:43 AM
|
Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
|
I Win
Joined: Jan 2003
Posts: 32,394
|
Quote:
If the converter is tight, which it appears, then the car lost a lot more weight after all the modifications than 2 different scales years apart show. The scales say it lost about 220, but the time slips say it lost closer to 400. I guess that would make the converter tighter. I did not change anything in the driveline, so the .3 to .4 decrease in et and 5 to 6 increase in mph is all weight loss. I do know I need to increase my launch rpm, which should help the converter situation.
So, assuming I have the front shocks as loose as they will go, what's the secret to loosening the front end? It is a Bob's profab with coilovers. QA1 single adjustable.
need to talk to Bob on that deal.
|
|
|
Re: 60' still stinks
[Re: Quicktree]
#1779399
03/15/15 02:04 PM
03/15/15 02:04 PM
|
Joined: Jan 2005
Posts: 3,639 Oakland, MI
dizuster
master
|
master
Joined: Jan 2005
Posts: 3,639
Oakland, MI
|
I don't know about the particular valving of that shock... but... it is VERY VERY VERY (did I say VERY?) unlikely that 180% anti-squat will want the rebound on full loose. Especially with that big of a tire. At 180%+ anti-squat, it's trying to hit the tire VERY hard and separate the body. If you have the shock on full loose, it will slam the tire into the ground and use up all of it's travel very quickly in the run. In extreme cases it will actually hit the tire so hard, the tire will bounce back off the ground and unload the tire (which is what's probably happening here). If you watch the video, the rear is out of travel before the motor ever even makes it up to the flash RPM, within the first 5 feet of the run or so. The only other thing that would make it act like this is if the shock didn't have enough travel for the separation that the body is trying to achieve at 180%+ anti-squat. I'm not sure what you have the compression settings at, but if you're going to run the anti-squat that high, I would run them near full tight on compression, and put them somewhere in the middle on rebound to start with. Full loose on the fronts is fine for now. If you get in a situation where it starts to pitch rotate, and suddenly spins a few feet out, that is a symptom of the front shocks topping out and unloading the rear tire. I don't think that's what you're dealing with here at all though. Here is a thread I posted last fall... sort of talks about/shows the tire hit that I'm referring to with the shocks too loose. Mine is a cal-track car, but not so different then your 4-link with the Anti-Squat up that high. https://board.moparts.org/ubbthreads/show...amp;Search=trueGood luck! Scott
|
|
|
Re: 60' still stinks
[Re: dizuster]
#1779402
03/15/15 07:02 PM
03/15/15 07:02 PM
|
Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
|
I Win
Joined: Jan 2003
Posts: 32,394
|
Quote:
Month it went 1.40's with the same tire and caltracs before. Something is going on with the new suspension.
depending on what the conditions were we he ran that vs now. and the 4 link needs a little power to work it. like Monte said big tire low power thats what you get. been there done that.
|
|
|
Re: 60' still stinks
[Re: Quicktree]
#1779403
03/15/15 07:14 PM
03/15/15 07:14 PM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
For one thing.. I think he is putting too much emphasis on the anti squat.. that goes in line with the IC.. if the IC isnt right its picking up from the wrong point of the car... if it isnt hitting the tire hard enough move the IC back and up... but when the IC is up it doesnt hold the hit as if its lower
|
|
|
Re: 60' still stinks
[Re: weedlayer]
#1779406
03/16/15 12:22 AM
03/16/15 12:22 AM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
The closet I can get to that according to my program would be the following
That also means I went the wrong way again.
I don't really care about chasing et, just want to optimize the set up for consistency.
Well.. hows it working now... you have to change so why not try what someone suggest.. its no big deal to put it back to what doesnt work
|
|
|
Re: 60' still stinks
[Re: Quicktree]
#1779408
03/16/15 03:30 AM
03/16/15 03:30 AM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
I can tell you I moved mine a few times and it did absolutely nothing.
What did you move Tony.. IC length or height.. once you find the right place there is only 4-6 changes that work for your car... yeah the 4 link has a pile of adjustment points but that helps you find the RIGHT points to play in... once you find the right place you only get a few minor moves
|
|
|
Re: 60' still stinks
[Re: Quicktree]
#1779409
03/16/15 03:42 AM
03/16/15 03:42 AM
|
Joined: Aug 2003
Posts: 43,744 Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,744
Bend,OR USA
|
Quote:
I can tell you I moved mine a few times and it did absolutely nothing.
I've moved the front adjustments on three different ladder bar cars trying to improve the 60 ft times, those three cars weren't spinning the tires so nothing made it better. The OP is spinning now so he needs to fix that problem, doing nothing changes nothing I did end up changing the front shocks on my ladder bar Duster at first and finally ended up with a set that helped the 60 ft. times some, not a bunch, but some I later changed the rear single adjustables to double adjustables and experimented on setting and that help some more I learned like Mike is saying once you get it close minor changes can help you some more, not a bunch though OP, try what you want to
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: 60' still stinks
[Re: MR_P_BODY]
#1779411
03/16/15 04:00 AM
03/16/15 04:00 AM
|
Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
|
I Win
Joined: Jan 2003
Posts: 32,394
|
Quote:
Quote:
I can tell you I moved mine a few times and it did absolutely nothing.
What did you move Tony.. IC length or height.. once you find the right place there is only 4-6 changes that work for your car... yeah the 4 link has a pile of adjustment points but that helps you find the RIGHT points to play in... once you find the right place you only get a few minor moves
both, made no difference on the way the car reacted, just not enough power.
|
|
|
|
|