Re: 20 inch springs or longer?
[Re: MattW]
#2248269
02/06/17 02:30 AM
02/06/17 02:30 AM
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Joined: Jan 2007
Posts: 685 pennsylvania
poboyengineering
mopar
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mopar
Joined: Jan 2007
Posts: 685
pennsylvania
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The longer spring will move the leverage point, but the short spring will be stiffer. If you keep the front segment as stiff as the short spring there may be some gains.
It may be ugly, but it sure is slow.
Girls comb their hair in rear view mirrors and the boys try to look so hard....
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Re: 20 inch springs or longer?
[Re: poboyengineering]
#2248302
02/06/17 04:29 AM
02/06/17 04:29 AM
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Joined: Jan 2003
Posts: 6,146 Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,146
Melbourne , Australia
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With a Caltrac or similar traction device, the old stiff front segment idea basically becomes a moot point. If you choose to go this route, Calvert can build a split mono with either a 24" or 25" front segment. I don't really see any negatives.
I do recall Monte talking about some theories of his that made a lot of sense. Hopefully he chimes in, I don't want to get it wrong and be misleading
Alan Jones
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Re: 20 inch springs or longer?
[Re: MattW]
#2248835
02/06/17 11:50 PM
02/06/17 11:50 PM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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The point of the two, listed bars is to make the front section stiffer, so I would go with the standard length A body length section. Unless you could use more front tire clearance on the tire vs wheel well clearance. Your best bet is to stick with the length you have now. A longer front section will have a effect on drive shaft length But, there is a spacer bracket you can use to negate effect as well.
How fast is your ride? What kind of performance et are you expecting or planning for?
Last edited by Sport440; 02/07/17 02:45 AM.
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Re: 20 inch springs or longer?
[Re: Jeremiah]
#2248933
02/07/17 02:53 AM
02/07/17 02:53 AM
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Joined: Oct 2007
Posts: 3,978 Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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How far did the longer segment move the wheel back Dom? The spring is 5 inches longer, you move your front mounting point. You can then chose where ever you want your tire.
Brett Miller W9 cnc'd heads STR Chassis fabraction
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Re: 20 inch springs or longer?
[Re: MattW]
#2248994
02/07/17 10:52 AM
02/07/17 10:52 AM
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Joined: Sep 2012
Posts: 1,563 Janesville, WI
SpareParts
pro stock
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pro stock
Joined: Sep 2012
Posts: 1,563
Janesville, WI
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Like what's been said, both can work especially in that range. On paper the 25 is better. My car has 20" segment and I haven't had any problems that I would blame them for. I guess it's your call is kinda what it comes down to.
Last edited by SpareParts; 02/07/17 10:55 AM.
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Re: 20 inch springs or longer?
[Re: MattW]
#2249039
02/07/17 12:42 PM
02/07/17 12:42 PM
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Joined: Mar 2010
Posts: 625 Indianapolis In. usa
Quickrunner
mopar
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mopar
Joined: Mar 2010
Posts: 625
Indianapolis In. usa
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Check out my build thread. I did 25 inch front with fabbed front and rear mounting.
05 Ram 1500 Daytona package 71 Demon Gen3 hemi drag radial project
Missin' my 9 second 70 runner!
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Re: 20 inch springs or longer?
[Re: MattW]
#2249043
02/07/17 12:46 PM
02/07/17 12:46 PM
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Joined: Oct 2007
Posts: 3,978 Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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Nice looking set up quick runner.
Brett Miller W9 cnc'd heads STR Chassis fabraction
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Re: 20 inch springs or longer?
[Re: Jeremiah]
#2249053
02/07/17 01:07 PM
02/07/17 01:07 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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How far did the longer segment move the wheel back Dom? I didn't move the rear back just moved the ft. box 5"'s forward into my sub-frame connectors which stiffened it up even more........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 20 inch springs or longer?
[Re: J_BODY]
#2249826
02/08/17 06:14 PM
02/08/17 06:14 PM
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Joined: Nov 2004
Posts: 6,890 North Alabama
Monte_Smith
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master
Joined: Nov 2004
Posts: 6,890
North Alabama
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seems I remember people discussing the longer sections.... but then pointed out Jason Digby was still running the 20" segment. Digby's car is fast, no doubt. But so far they haven't been able to get it to 60ft anywhere near where they would like it to. So, is that due to short segment, or they just haven't nailed the setup yet? Remains to be seen. So far when they have tried to 60 it much harder than 1.14 or so, it's knocked the tires off and we know of leaf cars that go 1.0s. So they still have work to do. Lyle and I were discussing this very issue in Bradenton. Now while we don't have many fast leaf Mopars to base any conclusions on, we do know, as mentioned above that there are several fast leaf cars that 60ft in the 1.0s. Those are GM cars. That doesn't really mean anything either, EXCEPT those cars all have longer front segments........so, form your own conclusions. I think either will likely work, but maybe one is easier to make work The hardest 60 footing leaf car that I know of, is Ron Rhodes. He has been 1.04, maybe quicker, but the car is light which helps. But I also know of some in the 3000lb range that have been in the 1.0s as well
Last edited by Monte_Smith; 02/08/17 06:22 PM.
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Re: 20 inch springs or longer?
[Re: MattW]
#2249964
02/08/17 10:32 PM
02/08/17 10:32 PM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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I'm setting the car up for low 8 secs. Whether I get there or not is another matter. I want to build it once. If it's easier to set up a 25" over a 20" at the track then so be it I'll put in the 25. Didn't know you were willing to go to 25" when I posted. In that case yes, I would go with it. When you get the shorter segment to become stiff, it needs a lot more shock resistance to control its movement. The longer lever will be better in your case. It can be done though, as others are doing it, with the shorter stock option segments.
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Re: 20 inch springs or longer?
[Re: Sport440]
#2249982
02/08/17 11:04 PM
02/08/17 11:04 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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It comes down to HP and the CG of the car.. in theory you want the bars or IC to lift from not too far behind the CG of the car to give the max loading on the bars/springs... then if you add boxes to it you would want to lower them for a longer sustained hit
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