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Author Topic:   WE STINK......NEED 4-LINK HELP
JERP27
Dirt Roller

Total posts: 22
posted July 17, 2002 08:42 AM
We stink.....need 4-link help

This is for a mod, but the more people that get a chance to look at it the better...

I'm seeking the vast knowledge of the reading audience. I need help with our 4-link car. There has to be something that we are missing. Here is what we run: 1/2 mile high banked clay track that gets black by feature time. We are ok until it's gets black then we go backwards. Here's our set-up:
50/50 shocks on the front with 40/40 on the rear, 1000lb spring on the LF & 900 on RF, 250 on LR, 225 on RR and 300 spring on the lift bar. "J" bar that goes from the right side of the chassis to the left side of the pumpking.
Link's
LR:
-Top: 1 dn from top
-BTM: Btm hole
RR:
-Top: 1 dn from top
-BTM: Btm hole

The scaleing #'s are as follows: Race ready full of fuel
LF: 495
RF: 590
front%: 44.9
Left side: 52.6%
Right side: 47.3%
Cross: 56.5%
LR: 775
RR: 554
Rear Split: 55.0

3" REAR STAGGER, 1" FRONT

Chevelle front clip, the the LR spring behind the rear end.

This past weekend started 3rd and finished 12th, max rpm of 6600 with 5.00 gears. rear tire temps, 140's for LR and only 160's for RR, so he wasn't over driving the car.

Any help and or suggestions would be much apreciated.

ridgerunner21
Dirt Newbie

Total posts: 2
posted July 18, 2002 12:41 PM
Are you wanting to turn more rpms? Is the car spinning? I would try putting more bite across the rear with the shock behind. What does the car look like on the track? Is it rolling over like it ought to?

[This message has been edited by ridgerunner21 (edited July 18, 2002).]

JERP27
Dirt Roller

Total posts: 22
posted July 18, 2002 03:13 PM
Other than having no fwd bite off of the corners the car is tight mid way through until exit of the corner. Entry is good. We are just looking for bite on the dry slick. We have the LR spring behind the rear end housing.

[This message has been edited by JERP27 (edited July 18, 2002).]

niclosr
Dirt Newbie

Total posts: 1
posted July 25, 2002 09:19 PM
try puting stuffer spring on rf that should tight you up off the corners

bizkit
Dirt Full Roller

Total posts: 66
posted July 26, 2002 07:01 AM
YOur car is tight across the center and the driver is basically busting the tires to keep it turning so he can exit the corner, then on exit the tires or spinning? If this sounds like it could be whats happing put more LS% in the car, get it up to 57% with the driver in the car, if that makes you to loose in, remove 1% at a time until you find a happy medium, also making the right side 4 link bars longer might help turn it acorss the center, which might would hook you up off are at least keep you from having to make her turn thru the center. I would try the LS% first though....160 degree on that RR if its a Hoosier D55 is getting real close to be to hot

wefly
Dirt Roller

Total posts: 19
posted July 29, 2002 10:18 AM
OK,here you go

Rear%, 57-58.5
Cross, 53 -53.5 no more
left side, OK
left rear , 135-155 the tires and the cars of this type dont like much more than that.

get yourself a 75-3 shock for the front
depending on track 75s, to 75on the right and 75-3on the left front for the heat race and ,75-3 on RF, 75-3 on the LF for the feature.

move the top bar on the RR down 1 hole

stagger 1.5-1.75 max for the heat
.5 to -.75 for the feature according to how slik the track is

Springs 900 LF, 800 RF ,250 RR ,225-250 LR

Front tires need to be close to the same weight or maybe just 20-30lbs heavyer on LF

can the j bar be moved to the left side ,if so if your pinion plate has 4 holes a good place to start would be 2nd hole down from the top and about 3degrees down hill to the pinion


this is a much faster car than the one you run now and a much smoother car thus decreasing lap times.

Let me know how it works!!!

JERP27
Dirt Roller

Total posts: 22
posted July 30, 2002 09:18 AM
How is this set-up going to affect the handling of the car? Loosen it up? Improve fwd bite? We have never ran that low of stagger before, we are always around 3-4".

wefly
Dirt Roller

Total posts: 19
posted July 31, 2002 02:07 AM
it will improve bite,and make the car better through the turn
quote:
Originally posted by JERP27:
How is this set-up going to affect the handling of the car? Loosen it up? Improve fwd bite? We have never ran that low of stagger before, we are always around 3-4".


wefly
Dirt Roller

Total posts: 19
posted July 31, 2002 02:09 AM
with that much LR the car will push in the middle

JERP27
Dirt Roller

Total posts: 22
posted July 31, 2002 08:54 AM
We found out that we had a bent RF shock, we replaced that and we'll see how the car does this weekend. We are planning on changing the set-up if does not improve, and we'll take a hard look at your suggestions. Thanks for the input.

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