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Post by volksmech on May 4, 2015 11:14:57 GMT -6
the car is not loose , it is trying to steer the rear towards the wall going down the strait streatch. Looks like lowering one of the lower bars should help but I am trying to figure the pros and cons for either.
here is the set up. 09 harris 4 link. Chevelle front clip
springs are 550 lf 600rf 175 both rear. Rear is coil over with lr behind axle rf in front
52% left 56% rear. 51% cross 80lbs lr bite
j bar is 1 inch below pinion and is 6 inch higher on the frame
4 inches of drop in the limiter chain.
car is set up exactly to the harris spec sheet in every way I can find.
I am currently leaning towards dropping the lr lower bar a hole
Ideas?
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Post by volksmech on May 4, 2015 11:18:03 GMT -6
By not loose I mean it is still hooked up. It is not blasting the tires off
1 inch stagger front and rear on a dry slick track.
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Post by flipflopoo1oo on May 4, 2015 21:27:49 GMT -6
If using the j- bar 3-5 is in the house but the split up front needs to be more and try keeping the right side bars higher than the left to get it to close the rear on the throttle-- square the rear to lower ft ball-joint grease fittings as to a correct starting point and make it your last setting on the ground or scales! Arear split doesn't matter so much but I run a 25 stronger left to hold cross and lean the car left one inch up front and 1/2 rear! lower j-bar to 3 inches and then you might find the other things as to oversteer! Using the j-bar as a traction device can muck up the right drive to push the car left with out having to steer right to catch the left rear hike causing oversteer on the throttle-- 6-8 on a 3 linkor get a neg on left lower to control hike!!!
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Post by volksmech on May 5, 2015 6:47:41 GMT -6
the rear j bar is exactly where harris told us to put it. every where else i have read on other manufactures they are running less split than 6 inches. more like 3 to 5 but i set it up as thier manual says. after looking around a lot i am gonna drop the left lower bar a hole and see how it reacts. if it does well i can lower the right side lower also if it still needs a bit more. both of the lower bar angles are more uphill than i think they are supost to be which will give me the issue i am getting. just dont want to over tighten the car by doing both at the same time right off the bat.
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Post by flipflopoo1oo on May 6, 2015 1:54:12 GMT -6
As long as you keep at least 2-3 degrees difference with the car's leaned left one inch ft. and a half rear you can run the same holes -- ours after getting it dialed in is 4 left and 6 right on a three bar car! We go for drivability in our set-up and then add traction with cross and lead mounted low left and rear to hold and keep from loosing it as the car noses and roll down on the right side! Too much j-bar angle kicks the left up off of the spring and causes too much angle change that overcomes the balance of rear drive when rolled! We try to get right drive off the corner to push the car left and stop steering on exit!!!
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Post by volksmech on May 10, 2015 14:26:42 GMT -6
Update 5-9-15: ended up dropping both bottom bars 1 hole. Great improvement. Driver said the car needs more side bite now but has good forward drive. Moved 25 pounds up 9 inches in the rear center by the pumpkin and 2 inches right..... and 25 pounds up 9 inches from its previous place in the left front on the motor plate. Had to put 1 turn in the lr to get the bite back. See how this works out. If it still needs side bite I am thinking we need to move weight right.
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