Heavier RR spring for slick?!

[Dirtmod13]

Swartz , how big of track is it where u run 275?Haven't heard of that heavy but willing to try it.

[slmcrewchief99]

Our guys made a mistake Saturday night and put in a 325 and it was suppose to be a 225. I wasn't there but I watched the video. That thing was a hank to the center but pushed like a dozer on exit. LOL. And naturally that hurt drive when he did get it to turn. The track was bad dusty and hurt traction till about lap 20 and it cleaned off. Then the car got better but was still tight in the center. Track was also rutted up. (not a nice word)(not a nice word)(not a nice word)(not a nice word) thing bounced like a pogo stick. Can't see how he ran 3rd but he got up on the wheel and did. I am sure spring rates that high on the RR have a place but not at JMS. lol
Just remember that for every action there is an equal or opposite reaction. So when you change the spring to help the car in 1 place it can take away from another. So you may have to do more to offset. Just get you a good baseline setup. Make small changes at the track and dial it in. Test somewhere if you can. That is by far the best way to explore multiple adjustments.
Wish us luck this weekend. I'm taking everyone in our crew glasses this weekend. Maybe the 325 will stay in the cabinet like it should. LOL

[Punisher88]

Why not leave the 325 and go up on lr spring to take drive away? Or raise the right top rod? If it was that good on entry why couldn't you adjust exit to make it better? You could be on to something.

[Matt49]

That big of a spring split in the rear has some pretty serious implications on rear roll center also. I would avoid that type of setup.

[Punisher88]

I know what my shock guy has me on and it is a larger split than that and it works very very well. And he is a very reputable builder.. which I am on a higher banked very momentum dedicated track.

[Matt49]

I know what my shock guy has me on and it is a larger split than that and it works very very well. And he is a very reputable builder.. which I am on a higher banked very momentum dedicated track.

Rear roll center to the right should work well in your situation and that's what you have if you have a big split with the RR being heavier. That will free the car on it's own (not taking the springs into account independently). It may not work as well on a flat stop-and-go track.

[Punisher88]

I doubt it will I will switch back to a more standard rear spring set up. But it certainly woke my car up for my normal Saturday night track.

[Punisher88]

To add to it though I was very surprised the one night that the track slowed down and the bottom cam in that I was able to really roll the bottom and still get the drive center off with the left rear even as slick as it was.

[Matt49]

To add to it though I was very surprised the one night that the track slowed down and the bottom cam in that I was able to really roll the bottom and still get the drive center off with the left rear even as slick as it was.

Yeah...I would also expect the RR to somewhat overpower the LR too much in slick conditions with that type of setup. But it sounds like you've found something pretty balanced. Were you taking out quite a bit of RF shock rebound when it went slick?

[7uptruckracer]

Sometimes its about momentum I mean look at Eldora they had no drive to speak of just carry entry and middle and pedal pedal pedal.

[Punisher88]

I did take 3 or 4 clicks out. Probably 7 clicks from full lock. But I also tied the left front shock down to 2 clicks from full lock.

[25drtrkr]

I know what my shock guy has me on and it is a larger split than that and it works very very well. And he is a very reputable builder.. which I am on a higher banked very momentum dedicated track.

Someone refresh my memory, but isn't that what O'neal stumbled on in 07 when he won all those Speedweek races. I was there for most of them, he could pick up the throttle 2-3 car lengths before anyone else.

[Matt49]

Sometimes its about momentum I mean look at Eldora they had no drive to speak of just carry entry and middle and pedal pedal pedal.

It was kind of interesting to watch some of the guys that tried to run the bottom before it came in. To your point, no forward bite at all and it looked like they were just wheel spinning.

[hucktyson]

There was nothing at all on the bottom in the late heats Saturday ... They talked about eldora not being top side dominate anymore but after last week I call BS

[Matt49]

Someone refresh my memory, but isn't that what O'neal stumbled on in 07 when he won all those Speedweek races. I was there for most of them, he could pick up the throttle 2-3 car lengths before anyone else.

Eastbay (at least back then) was a completely different animal. Not sure about setup but O'Neal told me that he drove that place like a sprint car. Back the corners up, spin the wheels to the cushion, then let the big motor eat. But I can see where a bigger RR spring would help with that.