Re: Launch critique
[Re: dizuster]
#2163720
09/28/16 03:50 PM
09/28/16 03:50 PM
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Joined: Feb 2007
Posts: 1,608 fresno ca
mikeysmopars
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I didn't even watch the video (sorry at work), but I am sure the front shocks are too loose. I have the same AFCO DA's, I'm 300lbs nose heavy on a 116" wheelbase, and mine are STILL almost full tight. Got some 200 lb springs one the way, I started full tight when i first ran the car and it spun hard, I made two click increments and got a little better each run but still would chatter the tires and its full loose now which i did get the best ever 60foot but i know there is a lot more there to get. I appreciate everyone's input! My goal is to get a consistent low 9.50s and I'm close.
Founder and CEO of the Central Valley Mopar Drag Pack
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Re: Launch critique
[Re: MR_P_BODY]
#2164189
09/29/16 08:57 AM
09/29/16 08:57 AM
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Joined: Jan 2003
Posts: 10,016 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I Live Here
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Being a A-body those rear springs are too stiff so the design length on the shock will be way to long.. measure the design length. its not separating the body(lifting which is planting the tires).. you want just enough spring to hold the body up.. about 110-120 depending on the rear weight You may need to go as low as 85# on the springs, if your Dart is light in the back. I did. A ladderbar car like mine needs a ton of shock control on extension. You are probably close, if you have a three speed tranny or stick. No expert on the subject here, but I would think a soft spring rate allows the shocks to do their job best, which is steady application of rear axle speed.
Last edited by gregsdart; 09/29/16 09:03 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Launch critique
[Re: gregsdart]
#2164347
09/29/16 01:34 PM
09/29/16 01:34 PM
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Joined: Feb 2007
Posts: 1,608 fresno ca
mikeysmopars
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OP
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Being a A-body those rear springs are too stiff so the design length on the shock will be way to long.. measure the design length. its not separating the body(lifting which is planting the tires).. you want just enough spring to hold the body up.. about 110-120 depending on the rear weight You may need to go as low as 85# on the springs, if your Dart is light in the back. I did. A ladderbar car like mine needs a ton of shock control on extension. You are probably close, if you have a three speed tranny or stick. No expert on the subject here, but I would think a soft spring rate allows the shocks to do their job best, which is steady application of rear axle speed. I'm definitely no expert which is why I'm always askin for help here, What I have a hard time wrapping my mind around is it use to pick the front up and stick the tires with the 6 banger torsion bars and calvert 90/10 shocks. I did nothing to the rear and with setting the ride height in the front and adjusting the shocks as instructed by AFCO, I went from stiff to completely loose in the front and still seems like it needs to rotate a little higher to plant the rears. I have lighter front springs on the way but I cant understand why I may need lighter rear springs but i'll try anything to get it to hook like it use to. Keep the advise coming , I have thick skin so keep em cumin!
Founder and CEO of the Central Valley Mopar Drag Pack
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Re: Launch critique
[Re: J_BODY]
#2164588
09/29/16 07:12 PM
09/29/16 07:12 PM
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Joined: Feb 2007
Posts: 1,608 fresno ca
mikeysmopars
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OP
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get a pict of your front spring set up Mike... seemed to me at the ride height you were at, the spring seats were moved up quite a ways on the shock (spring compressed). Scroll up J, I posted pix of the fronts and rears earlier.
Founder and CEO of the Central Valley Mopar Drag Pack
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Re: Launch critique
[Re: Cab_Burge]
#2164666
09/29/16 08:50 PM
09/29/16 08:50 PM
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Joined: Feb 2007
Posts: 1,608 fresno ca
mikeysmopars
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Cab, I started at 14 and foot braking it spun bad, Adjusted the front shocks and took the pressure to 11 and still sun but not as much. Adjusted the shocks again and got a little better but was chattering the tires. I finally adjusted it full loose in the front and full loose in the rear and too the tires to 10 and it got the best 60 foot 1.35 but still chattered. I really don't think I'm far off but need a little something to get it to stick. One of the things I'm thinking of is pulling the stop and see if it will give it that much more front lift to get that little extra?
Founder and CEO of the Central Valley Mopar Drag Pack
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Re: Launch critique
[Re: FastmOp]
#2164677
09/29/16 09:01 PM
09/29/16 09:01 PM
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Joined: Feb 2007
Posts: 1,608 fresno ca
mikeysmopars
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That's why I suggested a longer spring That makes sense,
Founder and CEO of the Central Valley Mopar Drag Pack
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Re: Launch critique
[Re: mikeysmopars]
#2164689
09/29/16 09:24 PM
09/29/16 09:24 PM
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Joined: Aug 2008
Posts: 4,075 Mo.
racerx
master
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master
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Mo.
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Being a A-body those rear springs are too stiff so the design length on the shock will be way to long.. measure the design length. its not separating the body(lifting which is planting the tires).. you want just enough spring to hold the body up.. about 110-120 depending on the rear weight You may need to go as low as 85# on the springs, if your Dart is light in the back. I did. A ladderbar car like mine needs a ton of shock control on extension. You are probably close, if you have a three speed tranny or stick. No expert on the subject here, but I would think a soft spring rate allows the shocks to do their job best, which is steady application of rear axle speed. I'm definitely no expert which is why I'm always askin for help here, What I have a hard time wrapping my mind around is it use to pick the front up and stick the tires with the 6 banger torsion bars and calvert 90/10 shocks. I did nothing to the rear and with setting the ride height in the front and adjusting the shocks as instructed by AFCO, I went from stiff to completely loose in the front and still seems like it needs to rotate a little higher to plant the rears. I have lighter front springs on the way but I cant understand why I may need lighter rear springs but i'll try anything to get it to hook like it use to. Keep the advise coming , I have thick skin so keep em cumin! I'm in the same boat, i'v installed the the Bob's frontend kit with afco's and 250 lbs springs and can't seem to get it to hook, I use to 60' anywhere from 128-29's to now just 132 with the afco's/250 springs. Talk to bob a few weeks ago and he say to start loose on the shocks and foot break it, i went out last night and mange to get two pass in without much luck. I'll keep an eye on this thread let us know the outcome.
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Re: Launch critique
[Re: mikeysmopars]
#2164818
09/30/16 12:02 AM
09/30/16 12:02 AM
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Joined: Nov 2004
Posts: 6,890 North Alabama
Monte_Smith
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North Alabama
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What exactly is or do you mean by "chattering" the tires.
The only video you have shown it seemed to leave fine. So without seeing what it is doing, it is hard to diagnose an issue. I still don't think lack of front end travel has anything to do with the issue. If this car has enough power to go mid 9s, it needs very little front end travel.
And if you intend to use the trans brake, use it while sorting the car as well
What tire?
Last edited by Monte_Smith; 09/30/16 12:03 AM.
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Re: Launch critique
[Re: mikeysmopars]
#2164887
09/30/16 02:04 AM
09/30/16 02:04 AM
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Joined: Feb 2007
Posts: 1,608 fresno ca
mikeysmopars
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Tires shake or chatter is the only way I can describe it. It use to only do that when my slicks were going away but these are new, Hoosier 29.5 10.5 tread width is right at 11.2 across. I do intend on using the brake on the next outing. With all the new changes to the car I've only used the brake once and it spun pretty bad so I've been footbraking it to sort the front. I still only have about ten runs on the new combo.
Founder and CEO of the Central Valley Mopar Drag Pack
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Re: Launch critique
[Re: mikeysmopars]
#2164931
09/30/16 03:28 AM
09/30/16 03:28 AM
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Joined: Jan 2003
Posts: 19,382 Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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IMO better video will help a lot here..
My question is what are you trying to accomplish? Best footbrake launch or planning on using the transbrake? IMO if you plan to run the car on the brake all this stuff footbraking is kinda useless IMO. If the goal is to make it the best it can be while on the brake then why even bother with how it works footbraking, or are you looking to run a class where you have to footbrake it? Even if you do find a way to make it work decent footbraking all that may be totally useless using the brake.
Generally speaking on the brake it should take little front end movement to get the car to hook, on a footbrake IMO it will end up taking a great deal more travel up front to work..But that is just a guess. IMO from what I saw in the video was a decent working footbrake car. But that means little if you are not looking to footbrake it..Just seems counter productive to worry about how the car leaves footbraking if that is not the intention.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Launch critique
[Re: mikeysmopars]
#2165012
09/30/16 11:24 AM
09/30/16 11:24 AM
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Joined: Feb 2007
Posts: 1,608 fresno ca
mikeysmopars
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Thanks Al, my plan is to run c gas or 9.60 class. Last outing was purely to get the the front end sorted out and would spin just footbraking it. Towards the end it was getting better but even having the chip at 3000 would blow the tires on the hit.
Founder and CEO of the Central Valley Mopar Drag Pack
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