late model setup, need help

Hello everyone,

I have a real (and good) question for all of you,
I have an ACT Late Model ; and I’m presenting you my set up with details and I will have some questions at the end of this post.
First thing, next week end, I will be on a short track 1/3 mile with 12 degrees of banking; with the set up that I will present to you, I’m fast but loose at the entry. The end of the curve is OK (I can be push if I decrease too much my speed) but the worst is for this major felling of lose at the entry.

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This is the report of my circle track analyzer of trends performance:



Front Suspension                      RIGHT           LEFT

Spring Rate, lb/in                     350           300.
Motion Ratio                           .734           .733
Motion Ratio Squared                   .538           .537
Spring Angle, deg                      18.0           19.7
Wheel Rate, lb/in                      188.4          161.1
Instant Center Height, in              2.0            3.4
Instant Center Arm from Tire, in       62.3           39.6
Scrub Radius, in                       3.71           4.30
Anti-Dive, %                          
Roll Bar Rate, lb/in                           300
Roll Bar Motion Ratio                          .454
Roll Bar Motion Ratio Squared                  .206
Natural Frequency, cycles/sec          1.82           1.49
Roll Center Height, in                         1.52
Roll Center Offset, in                         13.99    Left

Front Roll Stiffness, ft lbs/deg               899.8
% Front Stiffness from Roll Bar                41.6
% Total Vehicle Roll Stiffness                 67.1

Front Lateral Load Transfer, lb/G              222.0
% Front Lateral Load Distribution              45.9

Rear Suspension                        RIGHT           LEFT

Spring Rate, lb/in                     225.           175.
Roll Bar Rate, lb/in                           0.
Roll Bar Motion Ratio                          .623
Roll Bar Motion Ratio Squared                  .389
Roll Bar Rate at Tires, lb/in                  0.
Natural Frequency, cycles/sec          2.24           1.75
Roll Center Height, in                         10.00
Roll Center Offset, in                         -.88 Right

Rear Roll Stiffness, ft lbs/deg                441.2
% Total Vehicle Roll Stiffness                 32.9

Rear Lateral Load Transfer, lb/G               261.6
% Rear Lateral Load Distribution               54.1


Total Vehicle ------------------------------------------------
Vehicle Roll Stiffness, ft lbs/deg             1341.0
Roll axis to CG ht Moment Arm, in              10.2
Level ground roll rate, deg/G                  1.88
Total Lateral Load Transfer, lb/G              484.
General Over/Understeer Rating                 some Oversteer

Comments:
 The average Front spring's Natural Frequency (1.65) is not significantly higher than the
   Rear spring's Natural Frequency (2).
 The average Rear spring's Natural Frequency (2) is somewhat higher than normal.
 A high Natural Frequency means the springs are too stiff.

 Your FLLD of 45.9% is somewhat Lower than typically used.
 A suggested 'starting point' for FLLD (Front Lateral Load Distribution) is 54%.
   This is based on adding 5% to this vehicle's 49% Front Weight Distribution.
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More set up infos:
Toe = 0
Bump steer = 0
Ackerman = 0
Housing = square and center
Training arm = LR = 4    RR = 2   and the third link at 6.5 degrees
Panhard 9 -11
       Stagger = 3
       Rear travel around 2 ½ - 2 ¾

FLLD = 45.9 %   ? Is that very important to have 54 % like it’s suggested in book ????
Mean . I’ve 49 static + 5% = 54…


weight

left:55.9% (56%max)
cross: 53.5%
Front:51%
total : 2880

coil
LF: 300
RF: 350
LR: 175
RR: 225


With the program, when I am simulated the track, the car is understeer at 17 % max at the entry and oversteer at 43 % out of middle. What is the right thing that we are supposed to have ????

I would like to try my front roll center around 2.2 of the ground and 4 to the left. Can it be better ???

I’m missing informations on that point.
That’s it for now…if someone can take time to read me, understand what I mean and also taking care for helping me with an answer, I will appreciate a lot.
Thank you and let me know if some infos are missing to complete my “puzzle”  

check your brake bias.  Turn acouple clicks forward.

might help.  

if i where you i would swop your rear springs and check your break bias, turn it all the way one way and count how many turns it takes to go all the way the other way, then go back half way and put 2 turns to the front. you want the fronts to be about 100 deg's hotter that will be pretty close.  

I agree with RLR-5124 on swaping the rear springs. You should have the heavier spring on the left rear. The rear springs decides what tire gets more bite/grip. A heavier spring on the left will decrease the loose condition. If the car starts to push to much, you may need to reduce the rear spring split from 50 lbs to 25 lbs. You may want to change toe settings to 1/8" to 1/4" toe-out. At 0 toe your front tires are fighting one another in the turns.  
Go Fast Turn Left..
Taylor Racing Fan Page on Facebook..  http://www.facebook.com/pages/Taylor-Racing/301029283402

I know that this is a bit late to post this for the time of your race but I thought for future reference I could weigh in a bit.  It sounds like your lose entry problem could be caused by too much roll in the front end on entry.  maybe trying a bigger sway bar or shorten your rod ends on the sway bar.  if your  dealing with problems on entry you'll never address the problems on exit cause the poor entry condition will affect the whole corner.