Re: Anti squat
[Re: Ohio Joe]
#1740537
01/27/15 08:56 PM
01/27/15 08:56 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Thanks for answering Mr P Body, guess I'm just a little leary of making to big of a change.
If you have a 4 link program your gonna find that you will end up with maybe 6 settings that work well.. and that will be with different IC lengths and where you are on the anti squat line (whether you want more hit or less and if it stands up to much)... in my pic in my sig here its up.. great for pics.. this other pic is how I normally launch.. this is a 1.19 60'.. mine doesnt change much in the 60' except for the height.. and it does set down smoothly
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Re: Anti squat
[Re: MR_P_BODY]
#1740538
01/27/15 09:10 PM
01/27/15 09:10 PM
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Joined: Jun 2013
Posts: 51 1.5 miles west of Jacksonburg ...
Ohio Joe
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My brother got a video of the same pass as the picture was taken. The car carries the wheels no higher than what they are in the pic but suddenly drops them about 15 to 20 feet out. Really don't know if it's just running out of power or it's my suspension set up. Thanks again for your help.
66 Dart GT " Rat Racer"
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Re: Anti squat
[Re: Ohio Joe]
#1740540
01/27/15 09:30 PM
01/27/15 09:30 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Posts: 52,972
Romeo MI
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Quote:
My brother got a video of the same pass as the picture was taken. The car carries the wheels no higher than what they are in the pic but suddenly drops them about 15 to 20 feet out. Really don't know if it's just running out of power or it's my suspension set up. Thanks again for your help.
What are the numbers on a normal run
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Re: Anti squat
[Re: MR_P_BODY]
#1740541
01/27/15 09:39 PM
01/27/15 09:39 PM
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Joined: Jun 2013
Posts: 51 1.5 miles west of Jacksonburg ...
Ohio Joe
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Strange struts on the frt set as loose as we can get them. Afco da's on rear. When we make adjustments to the shocks in the rear it shows up in the 60' times. I must say my son and I are not real happy with the struts. Thinking about having them revalved.
If I remember the 60' time on that run in the pic was 1.32 and that was the best it has ever done . That weekend every pass was in the mid 9.80s .
Last edited by Ohio Joe; 01/27/15 09:45 PM.
66 Dart GT " Rat Racer"
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Re: Anti squat
[Re: Ohio Joe]
#1740542
01/27/15 10:59 PM
01/27/15 10:59 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Posts: 52,972
Romeo MI
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Quote:
Strange struts on the frt set as loose as we can get them. Afco da's on rear. When we make adjustments to the shocks in the rear it shows up in the 60' times. I must say my son and I are not real happy with the struts. Thinking about having them revalved.
If I remember the 60' time on that run in the pic was 1.32 and that was the best it has ever done . That weekend every pass was in the mid 9.80s .
It might want the shorter IC... thats the thing with cars... nothing is the same... my setting wouldnt most likely work for you... just start trying but move the IC back to about the CG point.. it will most likely like it just behind the CG... testing is the only way
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Re: Anti squat
[Re: Ohio Joe]
#1740544
01/28/15 06:55 PM
01/28/15 06:55 PM
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Joined: Dec 2005
Posts: 11,621 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,621
Fulton County, PA
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Not interested in causing a train wreck so I will just add this.
For a long time, I have not paid attention to ICs or anti-squat numbers. I am only concerned with geometry; upper and lower bar angles, front and rear spread and height, percentage of rear spread above and below the axle centerline, etc. These are the things that determine what happens when torque is applied to the pinion.
I've seen old 4 link brackets with the holes in the wrong locations, front brackets in the wrong place, things that make it impossible to put the bars where they need to be. Sometimes it's not as simple as moving a bar or making a shock adjustment.
Torque and stroke matter. Effective low gear ratio matters, as does many other factors. Shocks and spring rates are more important than most would think.
Once a base line is established, the car will tell you what adjustments it wants once you get it to the track.
If the results don't match the theory, change the theory.
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Re: Anti squat
[Re: CMcAllister]
#1740545
01/28/15 08:08 PM
01/28/15 08:08 PM
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Joined: Jun 2013
Posts: 51 1.5 miles west of Jacksonburg ...
Ohio Joe
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Thanks for the reply, just looking for suggestings because I believe that there is more left in the car and I want to get the most out of it. I can tell u that the bottom bar is 2.5 degrees down and the upper is 9.8 degrees down. It has an 11.5 inch spred in the rear and 8 inch spred in frt. Plotting it out puts the IC at 102 inches out. The motor sits back in the car and the weights are 1320 lbs in the frt and 1430 in the rear. 727 trans and 4.88 gear with a 470 ci low deck. Thanks for your time.
Last edited by Ohio Joe; 01/28/15 08:10 PM.
66 Dart GT " Rat Racer"
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Re: Anti squat
[Re: dvw]
#1740549
01/28/15 10:13 PM
01/28/15 10:13 PM
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Joined: Nov 2003
Posts: 1,969 Chandler, AZ
Duner
top fuel
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Posts: 1,969
Chandler, AZ
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Quote:
If I'm wrong on this I'd like an explanation. My feeling is if the car is up on the tire w/o excessive spin and chassis/housing movement, a suspension change isn't going to make it go any quicker. I think power has a way bigger influence on 60 ft that most people think. Whether it be gear, converter, engine or a combination of any of the three. Doug
That "IF" thing gets me every time.
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Re: Anti squat
[Re: dvw]
#1740550
01/29/15 04:45 PM
01/29/15 04:45 PM
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Joined: Dec 2005
Posts: 11,621 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,621
Fulton County, PA
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I wondered the same thing a long time ago. There is an awful lot of things happening from the time the driveshaft starts to turn until the front tires break the 60' beam. Making it all happen as efficiently as possible is the trick.
If the results don't match the theory, change the theory.
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Re: Anti squat
[Re: dvw]
#1740551
01/29/15 08:51 PM
01/29/15 08:51 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
If I'm wrong on this I'd like an explanation. My feeling is if the car is up on the tire w/o excessive spin and chassis/housing movement, a suspension change isn't going to make it go any quicker. I think power has a way bigger influence on 60 ft that most people think. Whether it be gear, converter, engine or a combination of any of the three. Doug
It is the whole package... I have some good video of my car with some slippage(controlled) to get up on the tire.. and I have some other settings that it gets up on the tire(again controlled slippage).. on my car it just lifts the front higher with the same 60' numbers... but with it up higher I get more wind under the car and tends to show up in the 330'... but I have to make sure whether its the fronts or rears hitting the 60' lights.. but usually its easy to see by the numbers
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