Re: 4 link bar lengths
[Re: eds dart]
#716270
06/05/10 10:42 AM
06/05/10 10:42 AM
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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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The problem with the longer bars is you cant get some of the shorter IC points.... my bars are 19" on a short wheel base car 
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Re: 4 link bar lengths
[Re: MR_P_BODY]
#716271
06/05/10 10:49 AM
06/05/10 10:49 AM
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Joined: Nov 2005
Posts: 656
Kokomo, IN
540dust
mopar
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mopar
Joined: Nov 2005
Posts: 656
Kokomo, IN
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Have you tried ballast, I forgot to mention I'm setting at 51.5% on the rear wheels. And what about tire and compound, that can make a difference in the heat. You going to Indy tomorrow ? Thinking about it. Tonight looks questionable for weather.
Last edited by 540dust; 06/05/10 10:51 AM.
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Re: 4 link bar lengths
[Re: eds dart]
#716274
06/05/10 11:37 AM
06/05/10 11:37 AM
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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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Quote:
I will be at Indy Sunday. I put an 8d battery in it to no real effect. It slowed some with the weight but would still spin unpredictably out of the blue. current tire is hoosier 32x14.5 stiff d05. i,ve used goodyear d4a and d5 compound tires over the years. with any new tire its great for 20 to 30 passes then the inconsistancies start showing up. can,t afford new tires every 30 passes so i need to get a handle on this.
Whats your IC location... the height is most likely
to high
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Re: 4 link bar lengths
[Re: MR_P_BODY]
#716275
06/05/10 12:27 PM
06/05/10 12:27 PM
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Joined: Feb 2007
Posts: 206
indy
eds dart
OP
enthusiast
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OP
enthusiast
Joined: Feb 2007
Posts: 206
indy
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Re: 4 link bar lengths
[Re: eds dart]
#716277
06/05/10 12:47 PM
06/05/10 12:47 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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Quote:
38 out 10 high
I would lower the IC to 6" for a lighter hit but it
will give you a longer sustained hit
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Re: 4 link bar lengths
[Re: eds dart]
#716278
06/05/10 01:20 PM
06/05/10 01:20 PM
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Joined: Sep 2006
Posts: 3,749
Chowchilla,ca
Chassisman
master
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master
Joined: Sep 2006
Posts: 3,749
Chowchilla,ca
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Quote:
38 out 10 high
You need to be around 42-47 4.5 -5.5 up.....bottom bar paralell to the ground as close as possible. Do you run tubes?
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Re: 4 link bar lengths
[Re: eds dart]
#716280
06/05/10 09:25 PM
06/05/10 09:25 PM
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Joined: Sep 2006
Posts: 3,749
Chowchilla,ca
Chassisman
master
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master
Joined: Sep 2006
Posts: 3,749
Chowchilla,ca
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Quote:
rear wheels are 14 wide back space 7. not sure if i can get 6 up with a 38 out. dont run tubes, current pressure is 10 lbs. bottom bar is up .5 inch up in front. when i raised the bottom up one hole for the .5 inch the car really started to wheelstand, those are the 38 out 10 high settings.
Running tubes would be the first step. They help support the sidewalls. IF your "dead" hooking your actually destroying your sidewalls. The tubes will be a band aid til you can get your settings right. But the tubes help keep the tire consistant.You actually need your tires to spin just a little....it's call wheel speed....dead hooking can cause in consistant 60' times.
Have you actually mapped your 4 link or are you going off their work sheets?
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Re: 4 link bar lengths
[Re: Chassisman]
#716281
06/05/10 10:25 PM
06/05/10 10:25 PM
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Joined: Feb 2007
Posts: 206
indy
eds dart
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enthusiast
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OP
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indy
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i,m trying the dead hook route because the vast majority of racing i do is sat night stuff. over the years i,ve found myself at 4 cars around 1am and blam here comes a .480 red and or a .02 breakout with ic set lower and longer, ie with wheel speed. late at night when the track comes to my car if i dont guess right and add some to the box and or dial down some i,m going home. but sometimes taht doesn,t happen and i,m .520 and ,o2 over or worse. what happens is at some point the car dead hooks instead of giving a half turn at the hit. i,m just trying to eliminate that late night variable. i,m using induction motorsports calculator for 4 link. i appreciate all the comments, keep em coming.
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Re: 4 link bar lengths
[Re: SCATPACK 1]
#716284
06/05/10 10:46 PM
06/05/10 10:46 PM
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Joined: Feb 2007
Posts: 206
indy
eds dart
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enthusiast
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OP
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Posts: 206
indy
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ic 38 long 10 high. Bill yeah thats a bummer. i have enough room to use a six inch backspace wheel. would be nice to try something different. seems i remember have the regular points race in conjunction with the diesel race some years ago.
Last edited by eds dart; 06/05/10 10:51 PM.
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Re: 4 link bar lengths
[Re: eds dart]
#716286
06/06/10 12:30 AM
06/06/10 12:30 AM
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Joined: Sep 2006
Posts: 3,749
Chowchilla,ca
Chassisman
master
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master
Joined: Sep 2006
Posts: 3,749
Chowchilla,ca
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Quote:
my original question about length of bars relates to the fact that the holes in the brckets front and rear are a constant. different length bars will change the angle of the top bar when using the same holes long bar versus short bar. i,m beginning to think the angle of the top bar is more important than ic location. all the tractive effort the rear/tires impart into the chassis goes into the car at the front brackets, not at the i/c. dave morgan mentions this in his book and i was wondering if anyone has changed bar lengths to test this.
Then try this....here's my other default...if all else fails....make the top bar go nose down at a 10 degree angle from dead level.The bar length will change the I/C's...but it almost sounds like you might have some shock issues.
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