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Author Topic:   3 link help
doghouse racing4
Dirt Forum Racer

Total posts: 91
posted August 23, 2004 01:48 PM  
I have a 3 link Harris and have made some changes to it and seemed to help the foward bite but I raced on a one lane dry slick track and I had to drive this car hard into the corners to get it to turn and my momentum would carry me a half lane to a lane out of the bottom grove which is where a car does not want to be. If I tried to let it roll through the corner it pushed bad. Here are my numbers, if anybody has some suggestions would apprieciate it. Also in the heat race, track had a little tack and the car would 3 wheel about 6-8 inches. Was pretty fast. Would also have to drive in hard to get car to turn but track would hold better.......springs lf 650, rf 750, lr 225 on slider in front of housing, rr 175 on top of housing. LR trailing arm 12 1/2" at 15* angle, RR arm 20" at 5* angle. rear end, RR leading LR 1/4".....Pull Bar has a progressive spring at 18* angle........ Scale #'s LF-489,RF-573, LR-787, RR-668. Cross=54.0 Left=50.7, Rear=57.7. 119 of LR bite...I scaled it with 20 gallons of fuel and no driver like Harris wants.....between heat and main moved the pull bar 1/2" to left which was over the drive line. In heat ran it 1/2" to right of driveline. Shocks LF 75/3, RF 75, LR 95/3 RR 93/5. First number is compression/rebound. This is the first time I ran my lower bar this short and the first time I ran this shock set-up. I do not want to hurt my foward bite but I need it to roll into the corners better. Thanks....sorry it is so long!!!!!

JT54
Dirt Maniac

Total posts: 170
posted August 23, 2004 03:45 PM  
Hey doghouse sound like your heading in the right direction......try trailing the right rear 1/4 to 1/2 this will help car roll into the corner when you get off the gas....also with that rear shock combo it is going to keep the car rolled over longer....if that is what is happening that could be the cause of the entry push.....my car was staying rolled over to long and was hard to be consistant especialy in traffic ,so I put a 93-5 on the left rear and a 95 on the rifgt rear ...these shocks slowed the transfer of weight down just enough that the car can drive anywhere on the track now except up in the marbles......good luck and keep at it !

mod70
unregistered Total posts: 170
posted August 23, 2004 04:44 PM           send a private message to JT54   Edit/Delete Message   Reply w/QuoteBBBBBB
I agree with 54, you sound like you are pretty close with that setup. What I am curious about and didn't see is what are your wheel offsets and what are you running for a pan bar and at what angle? To me it sounds like the car is staying too flat and not rolling over enough to plant the right side tires.

I also agree with not trailing the LR and either going square or trailing the RR. On dry slick you want the rear steer to get you around the corners, not the throttle.

[This message has been edited by mod70 (edited August 23, 2004).]

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted August 23, 2004 05:16 PM  
I am running a shorty panhard bar. Not sure of the angle but it is 4" higher on the chassis side and it is in the second hole from bottom, about even with the pinion. I checked it and it is 20* angle. It is 11" long. Beside leading the rearend what else would help with this push. I think I will run a more convention shock combo and see if that will work. I am running 3" offset on the LF and LR. 2" on RF, and 4" on RR.

[This message has been edited by doghouse racing4 (edited August 23, 2004).]

[This message has been edited by doghouse racing4 (edited August 23, 2004).]

badfastjr
Dirt Maniac

Total posts: 193
posted August 23, 2004 05:25 PM  
try taking angle out of the pnhard bar, with the shorty bar you dont need much angle and the less you have the smoother the car will be all around.

------------------
to finish first, first you must finish

[This message has been edited by badfastjr (edited August 23, 2004).]

155fan
Dirt Maniac

Total posts: 163
posted August 23, 2004 06:29 PM  
I think the 1st thing I would do is come up to the 2nd hole on pinion with about 2" rake and I bet it's the right direction but might have to go back down to 3rd hole with only 2" rake . 4" with that shorty is too much and 3rd hole down is pushin it maybe but more the 4" rake .

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted August 29, 2004 07:42 PM  
Ok from my original post I made the following changes....put in a 600 LF spring, RF stayed at 750. raised my shorty bar up 1 hole on pinion and took rake down to 2 3/4" at 15*. Heat race didn't have enough foward bite so I dropped the shorty back down 1 hole (even with pinion and ran it at 15* with 2 3/4" rake. I have the LR leading the RR by 1/4". changed shocks to LF 75, RF 75-3, both rears 93. everything else is the same as in the above post. STILL could not get the car to roll into the turns...push trying to roll into corner and did not have a ton of foward bite. Also a little tight on throttle, but not to bad. I think if I can fix the roll in problem the push on throttle is ok. I just can't kill any foward bite with any changes. What do you all think????????????????????

155fan
Dirt Maniac

Total posts: 163
posted August 29, 2004 08:23 PM  
Where is your stagger at on front and rear ? Man this thing sounds like the right direction to free it up goin in , especially you softening the lt. frt. spring . You could maybe add some more cross and raise the panhard to 2nd hole on pinion at the same time . The added cross and panhard will help free up gettin in but the added cross should keep ya gettin off good . A full fuel load (32 gal) will free you up gettin in too along with gettin you off good . Have you checked your brake calipers and master cylinders to make sure they're workin good ? I had a lt. rr. caliper screwed and was tight as **** gettin in .....worried about other **** not being right til I found the brake problem ..... Bingo , fixed it with new calipers .

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted August 30, 2004 09:28 AM  
Thanks for the reply, I would hope more people would reply. I am getting really frustrated over this ****!!! I checked the brakes this morning and everything seems to be ok. When I put the 600 LF in, it put my cross at 54.8. I raised my shorty up 1 hole in the heat with less angle and it took some foward bite away. In the main I dropped it back down even with the pinion with less angle then I originally ran and it would not turn into the corner. I always run with a full load of fuel. I think I am going to bring the rf in next and maybe go to a 800 RF spring (200 lb split) next. Any ideas please respond!!!!!!!!!!!!!!!!

[This message has been edited by doghouse racing4 (edited August 30, 2004).]

CUSTOMPERFORMANCE
Dirt Forum Champ
Total posts: 1172
posted August 30, 2004 09:46 AM  
If you are fighting the car for forward and side bite after making all the changes described take the rearend out and have the housing checked for straightness. You would be amazed at how big a slightly bent housng can make in the handling of a car.

JT54
Dirt Maniac

Total posts: 170
posted August 30, 2004 10:17 AM  
Hey dog house if you are running on a short track dont be afraid to trail the right rear 1/2 inch or lead the left ,....picture this ...when you are entering the turn and the car drops the short left link will flatten out past your static setting .for example if you have it set at 16 degrees when the car drops and your shock travel indicator moves 3 1/2 inches your link will flatten out to 10 degrees or less which causes the rear end to use up that 1/4 inch of lead and then some . I believe this is whats causing you to push .to see what the car is doing ,in the shop measure your static rear stear then push the left rear up into the wheel well to where it takes up the amount of shock travel you have been using( I usualy just screw my eliminator down to check this )your rigt side should come down about half way to the shock travel indicator if it is mounted in front of rear ,now re measure your rear steer and you should see a difference......keep working with static rear stear up to 1/2 inch ,if this dosnt fix it ,its probably just finding the right ballance between bar angle and static steer ......good luck and let us know what you find!

dirtywrench13
Dirt Freak

Total posts: 324
posted August 30, 2004 11:48 AM  
TRY TAKIN SOME WEIGHT OFF OF THE RF WHEEL, IT MAY NOT BE LETTIN IT ROLL OVER AND PLANT THE RR.

dirtywrench13
Dirt Freak

Total posts: 324
posted August 30, 2004 12:17 PM  
WHY NOT TRY TO SCALE THE CAR WITH YOU IN IT, THEN WE CAN GET A BETTER IDEA WHAT YOUR DEALIN WITH.

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted August 30, 2004 12:44 PM  
I will scale car with me in it and full of fuel, then I will post numbers. The Rf weight does throw a flag up to me. If I try to take weight off RF, my ride hts get messed up and I can't get the cross to where I want it. Yes I do change weights at all four corners when I have attempted to do this. thanks for the replys, keep them coming!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted August 31, 2004 08:56 PM  
TTT.....any new ideas?

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