5th coil spring choices

[Matt49]

I kind of agree with CCHIEF here. A 5th coil change isn't going to take you from junk in the slick (what you're describing) to running up front. Go back to standard 5th coil rate and location and figure out why you're not getting any body roll. Something could be in a slight bind that tractioned up conditions is overcoming. Body roll starts with side bite and then you can really start to hike the LR and get forward bite.
Check both right side shock travel indicators after a run in the slick and this can tell you a lot about where you're lacking side bite.
Where are your j-bar heights at each end?

[MLR19]

If you are really 2000 lbs @ 3" travel in the slick, I would expect the car to act exactly as you describe. I would wory less about load numbers & more about RF travel when the track slicks off.

[slingindirt83]

Im with MLR19 . That seems high for a 3" number. Try to get that at 4" and see if it helps. The numbers and travel go hand and hand . So to me it just sounds too stiff at that amount of travel.

[MasterSbilt_Racer]

So I remember seeing a specific load number mentioned in this thread, and I wanted to go back and confirm the number. And I now see that "people" must have been displeased with the amount of information the OP provided (look at the time and reason for editing).

Hey @DK1, I applaud your openness with information in merely trying to help your situation! And I hope you got the information you need. But for those who apparently had issues, those who think everything in racing needs to be so "hush, hush!" Get over yourself!

I realize much or most is gained through trial and error, and once learned is not often shared, but in the end what are we really doing for our sport? I see a lot of chatter lately by front runners about "this lapped car held me up" or "a lapper cost me the race." Did any of those leaders ever think of maybe going over and helping one of those lappers? Even just a little? "Hey, I see you're struggling getting into the corner. Where are you at on your RF?" You're not going to take a back marker and turn him into a feature winner just by sharing some information. But if you make him a little better, isn't that gonna help you not get "held up" when you're leading? (And I'm not saying the OP is a back marker, as I don't even know who he is.)

I attended one of the first Mark Bush classes, and he made it clear that he wanted us to better understand this stuff to keep us in racing. Because even though his business at the time was selling parts, when we don't understand something and start guessing, we start buying a bunch of parts (like 20 different springs or something). Sounds good on paper, but after a while we're broke, and guess what? No more buying parts from Mark Bush because we quit racing.

Nobody gives a rat's tootie what I run on my car, but if you ask me a question I'll give you a straight up, honest answer. I don't even back my car into my pit because I have nothing to hide. I used to do the tarp thing back in the 90's, but not because I had something trick, it was really just to mess with people. I'm sure there are drivers out there that could win (locally at least) in my car. But that doesn't matter, because they don't drive my car...I do. So whatever works for them may not work for me, but to act like they've got the secret formula or something...come on.

There are some who don't hesitate to share very valuable information, like Matt49, Mastersbilt Racer, and Billet Birdcage just to name a few, and I have always appreciated their posts very much. But I feel sorry for @DK1 for whatever was said to him. The guy's just trying to get better...

I can't believe anyone got upset over such dated info. Oh well...

[25jrjr]

Slowest I have ever been is with a 250. Lol. Never worked for me

I agree....that was my first adventure with a longer/softer. Our local track was Putnam County and you know how sandy slick that place was. We had to put a ton of side bite in the car as well.....equal trailing arm lengths, lowered j-bar, and stacked 350/150 left rear.

[DK1]

Thanks for the help everyone! It is much appreciated! Thank You!

That 3" number was actually the 4" number my mistake.

I made some changes and went through the car and found somethings. Will try it again on Friday.

[MasterSbilt_Racer]

Thanks for the help everyone! It is much appreciated! Thank You!

That 3" number was actually the 4" number my mistake.

I made some changes and went through the car and found somethings. Will try it again on Friday.

That makes more sense. Good luck!

[talclipse]

So are you guys always looking for X amount of load at 4" of travel? Or does that value change throughout the night? Which is more important, the wheel load or achieving the desired travel?

[MLR19]

As the track slicks off & lap times get slower, the car will generate less load. The RF front must either be softened or preload taken out of bump stop to allow the same travel with less load. How much depends on track condition & driving style.

[CCHIEF]

Preload taken out of bumpstop??Did You mean spring?

[zeroracing]

Probably meant shims out of the bump stop.

[MLR19]

Correct, remove packers to delay bump stop engagement, resulting in more travel with less force.

[CCHIEF]

Got it, now I'm with you.

[7uptruckracer]

Travel is way more important from a camber gain and geometry standpoint, but these days much more importantly from an aero standpoint. Granted on exit you do see some nose lift because the shocking they use in the slick to get some weight transfer

[huckleberry_hound]

Seen that exact thing before, hikes fine if there is some brown but if both tires in the black it's flat as a pancake no matter bar angles or etc. Is your battery mounted to the right over on the X, instead of over behind driver or over LR area? Is you left side % less then 54.0% (like 53.8% with driver)? I'm assuming this is a non xr1 car correct?

Do you recommend moving battery to center of car?



Your driveshaft isn't too long is it? and hitting trans just may not notice it in the traction cause there is traction there

We had this problem and overlooked it for some time until we found the driveshaft was too long and bottoming out against trans... didn’t seem to hurt when track was heavy but not enough drop when it slicked off