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Author Topic:   Right rear hot on 4-bar/z-link
de94wcc
Dirt Forum Racer

Total posts: 87
posted August 26, 2004 07:58 AM  
DW-8 with standard 4/z setup from Dirt Works. Have a 225 lr and 200 rr. Car is really very good, just would like it to come up off a little bit straighter. Car tends to be just a little "twitchy" off, and the rr is really smoking some nights. Seems like the lr has heat in it, but nowhere near the rr. The car lays over so hard it's beating the **** out of the underslung (I wonder some nights if it's not pulling the tire off the ground!), and it seems to me if I could just calm it down a little off the corner it would keep more weight on the lr, thereby solving my rr hot problem. Have a 14" panhard straight to the pinion, 7" up on frame, and second hole from the bottom (about 15 deg.). 4 bar lengths are approx. 15" eye to eye on top, and 13" eye to eye on bottom. z lengths are 13" eye to eye also. Car has phenomenal side/forward bite and I don't want to lose that. As I said, the car is working very good on all track conditions, I think it is just laying over too hard and I would very much appreciate any input.

Chad
Dirt Freak

Total posts: 269
posted August 26, 2004 08:49 AM  
If you raise the rollcenter in the rear by raising the straight panhard bar (up on the pinion and the frame), this will keep the car from rolling over as much. The downside is if you go too far, it will decrease your sidebite and your forward bite. Move it a little at a time.

badfastjr
Dirt Maniac

Total posts: 193
posted August 26, 2004 10:54 AM  
TRY PUTTING A 5/3 TIE DOWN SHOCK ON THE LR. THAT SHOULD HELP KEEP IT FROM ROLLING OVER SO HARD AND SHOULD MAKE IT DRIVE OFF THE CORNER BETTER

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to finish first, first you must finish

de94wcc
Dirt Forum Racer

Total posts: 87
posted August 26, 2004 11:04 AM  
Shocks make no difference to this car. I went as far as a a 60/10 on the left rear, no difference. My thoughts are 1) I need longer bars, 2) Move all the lead over to the left side of the car, or 3) I need a stiffer rr spring to allow less weight to transfer. I've always been taught to load the cold tire, so putting a stiffer rr spring doesn't entirely make sense, but any suggestions are appreciated.

zeroracing
Dirt Forum Champ
Total posts: 1875
posted August 26, 2004 11:33 AM  
sounds like your overheatingthe rr by spinning it hard. i would add some rr rearward bar angle, take some angle out of the lr upper bar, longer panhard or j bar if you can. and maybe some more rr spring. that will plant the rr more and level out the car and free it up off the corner, not that jump for the wall many cars have.

NJantz
Dirt Forum Champ
Total posts: 755
posted August 26, 2004 11:54 AM  
How about trying a j-bar or trying stiffer(slower) compressing shocks at the RF and RR to slow down the weight transfer to the right side of the car? Take some bar angle out of the LR upper bar and that will calm the car down some.

I've felt that "twitchy" feeling with soft springs before and youre sprung a little soft.


NJantz
Dirt Forum Champ
Total posts: 755
posted August 26, 2004 11:55 AM  
yeah, what zero said...LOL

CUSTOMPERFORMANCE
Dirt Forum Champ
Total posts: 1172
posted August 26, 2004 11:59 AM  
Rear springs are a little soft, I would run 250-275 in rear. 200 and 225 springs are what i run in 3 link cars most of the time.

de94wcc
Dirt Forum Racer

Total posts: 87
posted August 26, 2004 01:27 PM  
Thanks for the input. I guess a spring change is the next thing I will try. We haven't got as much racing in as we should have this year due to engine failures, and we only have about 6 nights on this suspension. We have run 3-bar cars for years. We'd hoped to have it figured out by now since we're heading to Boone in a few weeks. Don't want to be out to lunch there. What do you guys think about the bar lengths? Would longer bars help from getting up on the lr so quick? Does that have anything to do with why it gets on the rr so quick and stays there till I lift?

Kromulous
Dirt Forum Champ
Total posts: 796
posted August 26, 2004 01:42 PM  
I think i would move the rear roll center up before changing anything else, that should do what you want. Like Chad said, small adjustments at a time.

Raise it 1 hole on the pinion and 1" on the frame, keep the same angle and try it. If it dont work, change it back and up the spring on the right side, if that dont work. Combine both adjustments. 25lb stiffer RR spring and raise the panhard bar 1/2" on the frame side.

paulickr
Dirt Maniac

Total posts: 110
posted August 26, 2004 02:02 PM  
i run a dw 8 with a 4-z too, i also run a 225 on the left and had a 200 on the swingarm on the right. the problem there is that if you figure out the spring rate at the wheel with the 200, the rate is about 115lb at the wheel. way too soft.
i tried a 250 on the swingarm this week and also have a shorty bar on , what i found was the typical dirtworks push but also found that the harder i threw it in the corner the harder i could lay on the loud pedal and the faster the car was............this takes some getting used to because the corners are bad fast but if you stay with it coming out and dont lift much it corrects itself. we also run 1/2" static rear steer.
i run the offset wheels that dirtworks recommends but i may try a 4" offset on the rf or a a 3" beadlock to get my tight condition on entry to go away. it happens when i get off the gas unless i get off the gas really early. then everyone gets by me.
good luck

chizelnutz
Dirt Newbie

Total posts: 3
posted August 27, 2004 08:03 AM  
I would look into cutting out the frame where it is hitting. (dirtworks set up sheet suggestion) then maybe try a shock extension. If you are pulling the left rear off the ground the car will want to spin out the instant the left rear comes off the ground.

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