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Author Topic:   Front Suspension
Rook78
Dirt Maniac

Total posts: 106
posted October 12, 2004 09:09 AM  
I am not sure if this will make sense, but here goes. I am thinking of rebuilding my front suspension on my DRE car. Currently I have very little angle from upper ball joint down to where heims mount to the chassis. I am thinking of moving mounts down and spread them out farther using longer swedge tubes. Hope this makes sense. What, if any affect will this have on front end.

Thanks
Rook

paulickr
Dirt Maniac

Total posts: 110
posted October 12, 2004 12:20 PM  
this change will raise your roll center , why not just get longer upper ball joints and install them to raise the roll center. where is your roll center located right now.
this will reduce chassis roll theoretically

[This message has been edited by paulickr (edited October 12, 2004).]

paulickr
Dirt Maniac

Total posts: 110
posted October 12, 2004 12:24 PM  
this change will raise your roll center , why not just get longer uper ball joints and install them to raise the roll center. where is your roll center located right now.
this will reduce chassis roll theoretically

Rook78
Dirt Maniac

Total posts: 106
posted October 12, 2004 12:51 PM  
Remember...I am a rook, I could not tell you the difference between roll center and rock and roll.

I need to make these changes to sturdy up the suspension. I wish I could show you a picture of what it is now. I have a straight square bar that attatches to the stock mounts on the clip for the upper A arm. the heims then bolt to that bar. I broke three or four of them this season and want to move the mounts to the chassis. Again hope this makes sense.

Now if the affect of creating more angle in the bars from ball joint to chassis is greater roll center, A) what handling affect will that have. B) please define roll center.

Thanks for you input.
Rook

zeroracing
Dirt Forum Champ
Total posts: 1875
posted October 12, 2004 01:19 PM  
there is a good roll center calculator on the tool box section. get a good book like a steve smith and read what the changes will do and a target area. then download the calculator, and move stuff till it works good.

Rook78
Dirt Maniac

Total posts: 106
posted October 12, 2004 02:57 PM  
The car works real well now, I guess the bottom line is there will be a significant change to the handling with the above mentioned changes. Thanks for the info, I will get reading.

Rook

[This message has been edited by Rook78 (edited October 12, 2004).]

paulickr
Dirt Maniac

Total posts: 110
posted October 13, 2004 11:01 AM  
I RECENTLY CHECKED THE ROLL CENTER ON MY NEW (TO ME) DW8 AND DISCOVERED THAT THE ROLL CENTER WAS 3/4" BELOW GROUND AND 20" TO THE PASSENGER SIDE.
I RAISED THE INNER PIVOT POINTS OF THE UPPERS AND ALSO PUT LONGER LOWER BALL JOINTS IN AND USED THE COMPUTER PROGRAM FROM THE TOOLBOX ON THIS SITE. MY ROLL CENTER NOW IS 2.75" ABOVE THE GROUND AND 4" OFFSET TO THE DRIVERS SIDE. THIS SHOULD YEILD PREDICABLE APEX HANDLING AND MORE CHASSIS ROLL THAN I HAD.

ONE OF THE MOST IMPORTANT ADJUSTMENTS TO YOUR CAR IS THE ROLL CENTER......LEARN IT........KNOW IT.........LIVE IT.

Rook78
Dirt Maniac

Total posts: 106
posted October 13, 2004 12:16 PM  
Houston, we have a problem....I went into the roll center program in toolbox, and about a hundred pop ups came up. It tells me the file could not be found. Any help??

paulickr
Dirt Maniac

Total posts: 110
posted October 18, 2004 08:45 AM  
from what i understand, the calculator has been taken off and the program owner now charges 10.00 for it.
try a search for roll center calculators and see if you can finds it or try like i used to and lay it all out in chalk lines on the floor in actual scale and see where it is. its much easier with the program .

NJantz
Dirt Forum Champ
Total posts: 755
posted October 18, 2004 01:46 PM  
The best way to do this if you don't drawing software or the program is to make a full scale model out of poster board paper.

Rook78
Dirt Maniac

Total posts: 106
posted October 18, 2004 04:15 PM  
Not too sure I understand the drawing/postboard ideas. I have received the Steve Smith IMCA Mod book, I have not had the chance to get into it. I also pulled a couple of articles out of Circle Track that should hopefully help me to understand this better.

I am sure I will have questions even after reading. More to follow.

Mass confusion grand illusion!!!

JAW
Dirt Full Roller

Total posts: 48
posted October 18, 2004 05:20 PM  
What is a DRE car, never heard of that chassis before.
Where you from?
I agree with the others,remeber rookie
keep it simple.

Rook78
Dirt Maniac

Total posts: 106
posted October 19, 2004 08:47 AM  
The car is a David Ray chassis. He does not put too many cars out a year, but they seem to work very well. Mine is an older chassis, but has been updated. I live in Minnesota.

I agree with simple, but I am trying to get a grip on some of these things that for now I am ignorant on.

Like I say, this car works really well, but I would like to get some of the finer tuning done on it. I think it can still be better.

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