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Author Topic:   burning up the brakes
dirtywrench13
Member
posted July 15, 2003 10:59 PM
the driver is complaining of his car not wanting to set for the corners,and after 20 laps the brakes are just about on fire.went from unequal z-link to 4-z with short panhard bar or j-bar,depending on roughness of the track. d-w 8 650 &700 front , 275 & 250 in rear.ride heights around 6inches in rear,5&3/4 in front. 55.1l,58.6r,48.0c. any help here would be great.5.83 gear,1/4 mile track.long pull bar.


rocketwildone
Member
posted July 16, 2003 10:06 AM
48% cross weight?? Thats gotta be almost RR heavy??Try some LR, maybe, that will help it turn.We ru about 50 to 51% cross.About 100lbs LR heavy.


outlawstock17
Member
posted July 16, 2003 10:25 AM
lower the rear gear. a 5.83 sounds a bit too tall for a 1/4 mile track. a low gear will help slow the car down when the driver is off the gas and help the car take a set by dragging the rear tires going into the corner.


uforacing51
Member
posted July 16, 2003 02:44 PM
I had the same problem, raised my cross also, Look at the post called 4 bar/Zlink handling bug. Its should answer your questions.


dirtywrench13
Member
posted July 16, 2003 10:00 PM
i have a crazy idea so hang on,it seems to me that dropping the rear spring rates to 150 &175 may help more,because the car looks like its beeing held up,and he's using the brake to drag it down.we had 200&250 in it with the z-link on both sides,but we had a ton of balast in it also,to get tail weight up to get the forward bitewe needed.now bite isn't a problem,but getting it set is.we've always run a 5.83 gear and could turn 7500 in the feature,and set it by burping the throttle.HELP!


dirtywrench13
Member
posted July 16, 2003 10:55 PM
oh and i forgot to tell you folks that the driver weighs in at almost 300 lbs keep in mind that the car has a lot of left side also and most of the split in weights is in the front.the car seems to handle ok but he's using the brakes way too much & too long.,


lucky13
Member
posted July 17, 2003 07:22 AM
we run on hockey pucs,the problem is that half of the engine belongs to the other driver,and we dont have another gear 5.83 is as tall as it getsat our shop.all of my bars on the 4-z are set at dirt works angles,flat on the z-link,lower on the 4-bar is flat,and the upper is one hole from the bottom.short bar on the left upper.actually think dropping the spring rate and raising bar angles might get me where i want to go.what do you guys think?


dirtywrench13
Member
posted July 20, 2003 11:43 PM
as it turns out my theory on the springs was mostly correct.i still think lucky13 is right about the gears,i've been asking around and some of the faster cars around here are using up to a 6.00 gear in the cars with 4-link or z-link,and 4-z's especially.it was my belief that since i had little or no angle in the link bars that the springs were doing all the lifting and were carrying the car too well,thus the brakes were being used to pull the car down to set it for the corner.went from 275 - 250 to 225-200 on the rear and raised the front z-link bar to the top hole.now it will set for the corner without stabbing the brakes so hard,and it will come off the corner without tailing out as much.thanks for all the help guys!


bobbuck
Member
posted July 21, 2003 03:22 PM
you might want to raise the rake in the car to give the suspension more room to work try at least 1 inch. 48% needs to go up to low to mid 50's try 125 to 150 lbs of bite and move the right front foreward to 4 to 4.5 degrees you are probally about 3. springs do not sound too bad. keep your front close to even when you scale out. and toe out 1/4 in.my son is also 300lbs we had to shift fuel cell and battery to the right were running a 543 on 3/8s turnnin around 7200rpm


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