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Author Topic:   good and bad....need help.
MOD RACER#93
Dirt Freak

Total posts: 251
posted June 17, 2001 02:19 PM
here is what i have...
dirt works... 3 link.
650lf 750rf
225lr 150rr
lr spring in front, rr spring on top...
50/50 shock's, easy up on rf...
cushion J-bar mounted the way afco recomended. 20" long...
afco pull bar w/progressive spring, 20deg..
90/10 on top...
track is 3/8 mile banked. DRY slick. kinda flat on the bottom...

the car is good going in...good through the middle will run very very low and stick, (push if im not careful) but when i come off corner im losing. like it's not hooking up. im not getting but like 2 inches (at the most) of shock travel on the rr. like the car is not rolling over enough or something. i have my cell mounted to the right high, even my battery high on the left. also have a little weight over the rr tire. my rr tire is soo hot after the heat race it will burn you. and the outside edge is wore off. and the tread is wavy like. (these are hoosier tires A-40) last time i raced couple weeks ago, the car waz a rocket. passing lots of cars low. last night track waz little drier, and the car just wouldnt get much coming off. i can run under cars going in and through the middle (even have a awsome pic of 3 wide racing with me on the bottom) but last night coming off they take me. is it my rr tire is just going away. or is already GONE??? harder compound maybe??? track is BONE dry. should i have more shock travel at the rr??? the car dont feel lose coming off just wheel spin. any opinions or help would be greatly appreciated..... thanks in advance..

CUSTOMPERFORMANCE
Dirt Freak

Total posts: 213
posted June 17, 2001 05:25 PM
WHAT I DO IN THAT CASE IF I AM COMFORTABLEE WITH A CAR THAT IS DOING SAME AS YOURS IS , IS TO PUT A TALLER GEAR IN IT FOR THE TIMES THE TRACK IS GONNA BE SLICK, CUTS RPMS DOWN A BIT.

dirtracr
Dirt Full Roller

Total posts: 34
posted June 17, 2001 11:05 PM
i agree with that, weve had success with that on dry slick..ive also put the progressive link on the carburetor with success..with that rr being so much hotter, you may try more wedge..a softer lr shock will load the lr quicker coming off too..

[This message has been edited by dirtracr (edited June 17, 2001).]

irace74
Dirt Roller

Total posts: 24
posted June 17, 2001 11:06 PM
I have also experienced mixed results with the progressive spring pull bar. I think you will find that Dirtworks is recommending a biscut bar or a standard linear spring on the pull rod. Could Too hot a right rear indicate that your car is basically tight and you are making it loose with the throttle? With little spring travel on the right rear this what it sounds like. Have you tried lowering the panhard bar on the chassis or raising it on the 3rd member? Alittle higher roll center will allow the car to go ahead and roll over. I agree with custom performance, A higher gear will help slightly reduce wheel spin.

LITTLEMAN
Dirt Forum Racer

Total posts: 82
posted June 17, 2001 11:09 PM
First thing I'd do is get rid of the progressive try a straight rate,like a 600 to 700 in order for your set-up to gain forward bite the rearend must rotate so the left rear spring will lift the left side of the chassis gaining left rear weight and roll at the same time,even a soft bisquit bar would work,remember rotation of the rearend is the key.good luck let me know how its going.LITTLEMAN

wfoondirt
Dirt Maniac

Total posts: 142
posted June 18, 2001 09:28 AM
If your rr tire is that much hotter than the lr and by the sound of the wear pattern i would say that your already working the rr too hard and i don't want the car to roll more. Basically you just need to tighten exit., typically by adding rr lead or more cross. But without knowing your current setup i cant say for sure. I also agree with littleman on the torque link spring, the softer spring allows for axle rotation to add wedge under accel, if the tires are hooked up. Another thing that may help if possible move the torque link a few inches to the left of center. The biggest thing to driving a dry slick track is a light right foot, once you get the tires spinning its over, alot can be done with thottle linkages to help the driver be smooth on the throttle. As a sidenote to irace74, lowering the panhard bar overall reduces roll resistance not raising it.

start79
Dirt Full Roller

Total posts: 56
posted June 18, 2001 10:36 AM
Ya'll need to get mod racer 93 fixed, I race at the same track and had the same problem. Cars are almost the same..The only notable exception would be that when I exited the turn mine was bad loose. I run the harris spring bar that is adjustable, I'm going to move it to the left and try again....

MOD RACER#93
Dirt Freak

Total posts: 251
posted June 18, 2001 07:04 PM
i appreciate the input guys... my pull bar is favoring the right, i can move it to the center or to the left... also i have the spring bar mounted in such a way that it (spring)is like forward. most ive seen are mounted above the rear axle. would this make any difference??? i figure i am getting good sidebite cause the car sticks going in. i have a pretty good foot control on dry, and have progressive throttle linkage. i waz thinking today that maybe the axle is rotating when i start applying the gas, but when the progressive spring reaches the stiffer stage about the time im getting on it good coming off the turn the tires are breaking loose. does this sound correct??? i am very careful with my right foot when the track is like this... "got to have the soft touch"... at least thats what my g/f says.. sometimes i just floor it too.. but that doesnt do any good...lol. the rr tire has me concerned i am going to have to get another "new" one now, this one is trash. should i go a harder compound??? i race on a budget and need them to last a little longer than just one night..lol. thanks to a very generous "gift" (i would call it) i am still able to continue to race at this track... start79 will know what im talking about... tiny little peice of red plastic with a wire coming out of it.......... anyway..the A-40's are realatively soft, and after the feature the tire waz like blistered on the outside edge, and wore all funny.. the lr seemd ok like wore even across. i think i will get a straight rate spring for the bar a 600# ??? this track is bad dry.. water gone after hot laps.. but i still love it.. again thanks for the input and help...

LITTLEMAN
Dirt Forum Racer

Total posts: 82
posted June 18, 2001 09:14 PM
I'd go for the 600 lb. watch travel also having the left rear trailing arm uphill helps promote bite and rollsteer so when you do get it to hook up better the rearend will turn in the center with more roll.The harder compound sounds like a good choice to me won't get as hot as fast and will last longer so it won't gain as much air from heat,so stagger will stay more consistant.also going up on right front spring by 50 lbs. might be something you should think about.

Racer64
Dirt Roller

Total posts: 8
posted June 18, 2001 10:02 PM
I am having similar troubles. I have almost the exact same setup as you but I am now running the DW monte bar and helped me alot. I was running the spring link with the 600 lbs. spring and really didnt notice the difference like I did when I went to the rubber biscuit but like they say everyone drives different. Just adding my 2 cents.

spde
Dirt Roller

Total posts: 13
posted July 04, 2001 01:12 AM
ok i got a question ? how much rear weight are you running? are you up about 60% or more? i think also if you have to much angle on the pan-bar it hurts your off corner speed because the weight transfers slower back to the left. we run a dry track also and just put a new spring combo in were the
lf 650 rf 600
lr 225 rr 175
this seemed to let the car role forever and then hooked it up fast coming off. this is just an opion so good luck

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