Scaling problems!!! Help

[powerslide]

unhook your shocks also.if its on a pull bar unhook it also.

Stop please. You are confusing alot of people. If you unhook the pullbar the driveshaft will either bottom out in trans or pull out and let the rearend fall forward until the j-bar heim binds up.

Original poster. when you say you did everything. I assume you are cranking on the weight jack bolts and the wedge is not changing?

Do you have any racing veterans in your area? I would have someone look over it.

Sounds like a shock is bent or maybe bottoming out? Birdcage binding? Driveshaft bottoming out? Look at LR shock/slider

[sj valley dave]

I agree...I don't care if you have 100 lbs of RR static weight in the car...You should look around and see where your lead is located though....Once you start cranking down on the LR shock and RF shock you should start seeing the bite come up on the LR...period...We do not disconnect our shocks as some people say, as we are on the track with the shock connected to the car...All that aside, if you are cranking in more preload in the RF and LR and taking out preload on the RR and LF and you don't see anything changing, something is bent or bound up..

[TeamGRT12x]

Weight jacks do not put pre load on springs. Where did you come up with that?

[crateracer16]

Yes we were cranking jacking bolts and coil overs. We didn't change all 4 corners to keep all the ride height though. Going to try it tomorrow hopefully. there is no lead on the car at all. Im 200lbs over our minimum weig as it is. If I need a little to get the numbers right then I'll put some on. The driveshaft isnt bottoming out. Double checked that. Going to pull all shocks off tonight and check to make sure that they are straight.

[texas racer]

I would put it on stands pull lf sus. all the way down and put it back on say thing on the rf. Put jack under the center of the rear end pull everything loose and ck. Make sure the drive shaft does not have the spines twisted and it sides in the transmission with ease.

[powerslide]

Weight jacks do not put pre load on springs. Where did you come up with that?

When you turn a weight jack the spring is either getting shorter(more preload) or getting taller(less preload) It may not be a great term to use but i believe this is what he was trying to say.

[sj valley dave]

If you are talking about my post, maybe the term is not what you use, but if you take your coil over adjuster and crank it down to shorten, or put more pre load on the spring, you should see the wheel weight number go up...period

[TeamGRT12x]

The spring doesn't get taller or shorter. The chassis changes ride heights, which changes wheel weights. The only way a spring is going to compress more is by putting much more weight on it than it currently has. Why do you think when you put 5 rounds in the right front, the chassis height raises on that corner? If what you think is true, the ride height would drop.

[sj valley dave]

So let me ask you, if the shock is extended all the way out and you keep cranking down on the adjuster what do you think happens...The installed height of the spring does get shorter. Granted, when the car is at ride height and you screw down the adjuster you are altering ride height, but there will come a point when the shock is fully extended and then you are compressing the spring

[TeamGRT12x]

If your shock is fully extended, then you need to work in that area of the car. Are we really having this conversation? This is race car scaling basics. If that was the case, you'd need to change spring rates all the time.

[dirttrackrocker]

I agree... If your shock is fully exteneded, you have a very different set of problems to worry about. GRT is correct. Weight jacks do not add preload to a spring. When one end of the spring is on a movable part (control arm) you are not compressing the spring and adding pre load, you are simply adding static weight.

[stock car driver]

The spring doesn't get taller or shorter. The chassis changes ride heights, which changes wheel weights. The only way a spring is going to compress more is by putting much more weight on it than it currently has. Why do you think when you put 5 rounds in the right front, the chassis height raises on that corner? If what you think is true, the ride height would drop.

When I crank down on my rf or lr wt jack bolt that puts more weight on that corner and in turn makes that spring shorter...

Not sure why your in this argument, your not helping anyone get faster or smarter thats for darn sure. If you want to argue for arguement sake go to the gossip section.

[powerslide]

When we put "wedge" in a car we go around the car maintaining our R/H's. For this to occur something is compressing and something is lengthening. IE the spring so therefore the spring is getting shorter/longer or in SJ's term getting some "preload"

[HEAVY DUTY]

When we put "wedge" in a car we go around the car maintaining our R/H's. For this to occur something is compressing and something is lengthening. IE the spring so therefore the spring is getting shorter/longer or in SJ's term getting some "preload"

Absolutely right.
If they didnt get shorter with weight added and taller with weight taken away we would never be able to change the wedge without changing the ride heights a bunch. This is something most guys dont understand when scaling a car.If you screw a half inch into a spring, it usually doesnt raise the car a half inch, because the spring is compressing some when weight is being added to it. The corners straight forward and straight acroos will get higher because of weight coming off those springs.That is why you have to check all 4 corners when making an adjustment to one spring.

[crateracer16]

Ok. Changed my ride heights a little. Moved the fuel cell to the lr more. Lf shock was extended all the way(moved the mount down) and had the lr spring slider catching on the birdcage. Got her right on the scales now. Went to practice and turned 3rd quickest time on record and I've been out of a car for 4 yrs( not to toot my own horn. Lol) thanks for suggesting the 90lbs in the seat. That was a lot easier than me getting in and out of the car since I'm such a small guy. Thanks for all the help!!!!!!!!!!!!