How to properly set the preload.

406Monte

Dragway Regular
Nov 30, 2007
1,019
0
0
Hubert, NC
I installed a set of the following suspension parts on my car and it said youneed to set the preload just right or it can cause the pparts not to perform at there best. Well, first let me say that my car usuall never really runs a consistent sixty. It seems that it is always all over the place time wise. I run anywahere form a 1.75 to a 1.90 in the sixty. I have a set of Mickey Thompson Street E.T 28 x 12.50 x 15 tire. I have a limited slip in with 3.73 gears and a 3400 rpm coonverter. I hope that this helps with the equation. Now for the following parts i put on. I nstalled a set of the UMI double adjustable upper control arms and a set of UMI single adjustable lower control arms. I put in a set of 90/10 Competition Engineering shocks and a set of the 60/40 rear Competition shocks on the rear. I have Moroso trick front and rear springs and one air bag in the right rear spring. I don't have an anti roll bar or sway bar in the rear. I do however take out the fron sway bar bolts at the track for maximum weight transfer which makes it stick real hard and i have even had the front tires off the ground 2 times now, even with a crappy sixty foot time. I have not been able to set the pinion angle yet either that could be part of the problem i am having. I just thought that with all the parts i have installed my sixty would have dropped a tenth or two or am i wrong. Sorry for being long just wanted to get it all out there fo all to analyze. ](*,) :-k
 

crd89stang

Dragway Regular
Jun 19, 2005
750
0
0
attleboro ma
i would def install a sway bar of some type in the rear. check out baseline suspensions website tons of good info on there he is a new sponser
 

ky malibu

Weekend Racer
Aug 22, 2007
59
0
0
Ledbetter,kentucky
The limited slip rearend is most of your problem. Posi and an anti roll bar will fix your problems. Try about 2 or 3 neg on your pinion angle.
 

Excelerater

MalibuRacing Junkie
May 22, 2003
6,799
0
0
Memphis,TN
I have never preloaded my cars,always neutral....but usually it is just a simple adjustment of
an upper control arm...depending on which way your car is pulling towards
 

406Monte

Dragway Regular
Nov 30, 2007
1,019
0
0
Hubert, NC
Well, the car seems to hook for the most part. I have lately seen in the vids that it is spinning about 1-2 rotations on the line then it hooks pretty good. I have had the tires off the deck twice. I am running 18 psi in the tires. I can't remember what the air bag psi is right now. I mean it leaves hard and strong but it needs to be faster out of the hole. I wonder if more converter like a 4000 or slightly larger would help me? Is all my parts a good selection for my weekend strip runs and occasional street cruises?
 

Stangboy

Dragway Regular
Jan 27, 2004
833
0
0
Ky
Replies...?
 

Al

Pro Stocker
May 25, 2003
2,018
0
0
Harker Heights, TX
ky malibu said:
The limited slip rearend is most of your problem. Posi and an anti roll bar will fix your problems. Try about 2 or 3 neg on your pinion angle.
I think you're confusing limited slip with single track. Posi (short for Positraction) is a term used for Chevrolet's limited slip diff.
 

87montess

Amateur Racer
Jul 10, 2007
169
0
0
PHILLY
take the air out of the bag it does not work with the trick springs and 13psi in the tires i have all most the same set up and i get 1.5 60 foots all day the air bag made it 1.7 60s and that is low 1.5 i got a arb in know i am hopping for 1.4 60s
 

slimbo

Moderator
Staff member
May 21, 2007
4,223
0
0
www.yellowbullet.com
if its transferring and hooking then suspension work wont make it faster. more converter. just remember as you go upin converter you are going to find a point where the suspension needs to work. my car used to hook all day and run 11.70's. when i went to a 4500 stall converter to put the motor in the powerband the suspension problems really showed themselves. took me a whole summer to get it sortedout but now it runs consistent 1.48 - 1.53 60 foots on radials when im running 11 teens on motor. on a 50 shot ive gone 1.40 10.71
 

toxicbu

Frequent Racer
Feb 25, 2009
616
0
0
romeoville il
im runing a 9in spool rear no air bag no swaybar 90/10 drag shocks and the weekist rear spring i could find .she hooks hard and go's strait every time. my buddy had a malibu wagon with the same problem thay emptied the air bag and it hooked harder. tubeler swaybars help out .
 

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darius smith

Amateur Racer
Jul 12, 2006
206
0
0
fort valley, ga
it all depends on your power level what you need to work for you. i'm saying this because i have had all the g-body suspension on my car and still havent got the 60ft. in the 1.40s on motor. with trick spring on all 4 corners and 90/10 up front 60ft. was in hi 1.50s. i added a airbag with 15lbs and all it did was take sum of the twist out. got rid of springs in rear and replaced them with qa1 coil over springs (12" 130lb) and arb. the 60ft dropped to mid 50s and this was using 2 converters a 3600 nos and a 5400 t-brake. there was no different in the 2. my motor make a little over 600hp(flywheel). the new set up is qa1s R on all 4 corners. some time you just have to test and tune on the suspension the same way you have to do on the motor. i been at for at least 2 yrs and still havent reach my goals.
 
Are the front shocks set the same?

Set the p/s to 90/10 and d/s to 70/30 so it is a little "harder" to lift , helps it lift more square.

Got 1.46 60s that way with single adjustibles on the rear at 6 clicks (approx. 50/50),air bag at 7 psi, stock front spring and eibach lowering springs in the rear.

I have since moved on to double adjustibles up front.

Even a stock swaybar will help.

Agree on no air in the bag, the trick springs and the bar are doing the same thing, maybe TOO much.

I also suggest getting what you have to work before changing drivetrain parts.

I am still learning my combo and am trying to restrain for touching the motor for my 9.

My buddy needs his Dominator back so back to square one when "my" carb and manifold go on. Fun isn't it.

Good luck.

Oh, listen to Todd (10secbu ) he helped me out quite a bit .
 

kasper69

Amateur Racer
Jul 31, 2003
144
0
0
Romeoville , IL
How are you launching your car on t brake or foot brake if your foot braking are you tring to get up on the converter or are u get a little above idle and flashing the converter?
 

Malibu355

Pro Stocker
Feb 21, 2009
1,803
0
0
La Marque, Texas
kasper69 said:
How are you launching your car on t brake or foot brake if your foot braking are you tring to get up on the converter or are u get a little above idle and flashing the converter?
I foot brake my car, which is better? Flash or stall?
 

kasper69

Amateur Racer
Jul 31, 2003
144
0
0
Romeoville , IL
Just need to do trial and error.Some motor like coming of a brake and some like to be stalled and some like to take a run a the converter. The malibu in pic gets 5800 on the brake and the 2 step is set 4800 and a freinds s10 that gets 4000 but motor like flashing the converter from 1500