Re: coil over spring rates with ladder bars
[Re: RustyM]
#2499533
05/23/18 03:59 PM
05/23/18 03:59 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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It's going to have a 150 or 170 spring on it, depending on how much energy you want to store in the springs. 150s will take a good shock to control the housing on the hit.
Need to know shock manufacturer and part number, or extended, compressed and installed lengths.
Does it have an adjustable shock mount so that ride height can be adjusted independent of shock installed length?
Why are the ladder bars wonky one side from the other? Is it sitting that crooked or not put together right? I see you said it was level. Was that eyeballed or measured?
Once it's back together, you'll have to neutral everything and start over with the corner weights.
Weight distribution has less to do with hooking (or not) and more to do with leaving and driving straight.
Last edited by CMcAllister; 05/23/18 04:02 PM.
If the results don't match the theory, change the theory.
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Re: coil over spring rates with ladder bars
[Re: RustyM]
#2499598
05/23/18 06:04 PM
05/23/18 06:04 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'd probably start with a 150, and run the shock at about 13.750 C-C at ride height. That shock should work if it's not worn out, but you'll have to crank it up some. I'd like to see a DA on it though.
Beyond that, I'd want to know what's going on with the bars. Way heavy on the RR if the driver's in the car.
If the results don't match the theory, change the theory.
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Re: coil over spring rates with ladder bars
[Re: RustyM]
#2499638
05/23/18 07:41 PM
05/23/18 07:41 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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Bars varying 2 degrees from side to side is substantial. Something is bent, way out of adjustment or installed wrong. Thread count being close on all the adjustments kind of rules out the thing being adjusted that far out of whack. Is there an adjustment link provided in the bars?
DA = double adjustable shock.
If the results don't match the theory, change the theory.
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Re: coil over spring rates with ladder bars
[Re: CMcAllister]
#2499650
05/23/18 08:13 PM
05/23/18 08:13 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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Is the rear end back braced.. if not I would look there first to see if its twisted.. the 2.5 degrees is a fair amount and I'd look at the axle housing
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Re: coil over spring rates with ladder bars
[Re: RustyM]
#2499727
05/23/18 11:08 PM
05/23/18 11:08 PM
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Joined: Mar 2006
Posts: 9,861 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,861
MI, usa
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What are the front ladder bar bolt heights from the ground with driver in the car? By the weights shown it has a ton of preload on the RR, +100lbs. That could account for some or all of the ladder bar angle difference. I'm assuming the angle was measured with the driver. No way you need 150lb springs in my opinion. This video is almost your weight with 122lb springs/6 cylinder bars. No problem with weight transfer. Doug https://www.facebook.com/debby.kersantywright/videos/10211668943904056/?t=7
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Re: coil over spring rates with ladder bars
[Re: RustyM]
#2499974
05/24/18 01:52 PM
05/24/18 01:52 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 have never hear of people running 200# springs on a car in that weight range.. with the 1/4" of space your just trying to make the spring lighter in weight(cant happen)in my car(lighter) I use 90# springs.. you just want them to hold up the body.. the stiffer they are the harder to get transfer(no movement in the rear)
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Re: coil over spring rates with ladder bars
[Re: RustyM]
#2511550
06/22/18 12:00 AM
06/22/18 12:00 AM
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Joined: Feb 2017
Posts: 566 Texas
RustyM
OP
mopar
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OP
mopar
Joined: Feb 2017
Posts: 566
Texas
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Hey Guys: wanted to update folks and say proper a proper “ Thank you” as best I can from here.
The update : We put the 150lbs coils in the rear, 4 cornered the car and ended up with 23 lbs heavy on passenger rear and drivers weight distributed pretty evenly over car/ drivers side .
Car went lazer straight , best 60 ft ( 1.46 ) and ran it all night. Ran best time - 6.58 ( 1/8) and ran it consistently .
Still not where it should be, what’s desired realistically but, man, what a beautiful change in the car.
Thank you to everyone here- literally , just a huge thanks !! Best community I have ever had the pleasure of associating with- just top drawer!
Still little movement/ weight transfer. Bump stops were too tight so we opened that up to get some movement there. I still think rear springs are a little to heavy , i’m Thinking the car will like 130lbs. Ladder bars are nuetral - parallel with ground / middle Hole, May need to drop them down one but would like to see video of the hit and 60 ft first . He should be able to get my video this weekend . Car ended up at 3340 lbs with driver/ helmet / jacket in car, fuel cell full.
Most of the “ imbalance on the 4 corner weights was in the torsion bars - they were fighting each other. Main thing right now- car leaves/ runs straight thus safer for everyone , it’s quicker as well and it’s not beating the car up .
Thank you all very, very much. Any new advice is welcome of course!!
Blessings of Grace and Peace Rusty
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Re: coil over spring rates with ladder bars
[Re: RustyM]
#2511709
06/22/18 12:38 PM
06/22/18 12:38 PM
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Joined: Jan 2004
Posts: 8,300 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,300
fredericksburg,va
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"a correction CM: He does have lighter spring tension torsion bars , RUNS TRAVEL LIMITERS."
I see a problem there, friend had a 427 Vega, very hard to hook the tires, no rotation. He sold the car and the first thing new owner did was remove cable limiters off the front a-arms. First time out with no other changes carried the front wheel 1-2 ft and would hook on snott and picked up 2 tenths. Original friend wanted the "pro stock look", didn't like the tires hanging down on launch.
Last edited by cudaman1969; 06/22/18 12:50 PM.
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