Recent content by alpharomeofifetwo

We went up on the front springs 900 LF / 800 RF Had a test session Friday night and tried a 175lbs spring on the rr and had the same results tire temp wise. I was getting 5-6” of dynamic spring compression on the RR. LR was static loaded to 600lbs and getting 700-800lbs total of dynamic load...

I’m completely bamboozled at this point then. I reset RC to be dead center, up 3”. Raced tonight and still had excessive roll and lateral load transfer. Very loose mid/off. (Turned 4th quickest and finished p4) LF OAT+5° RF 130° LR 130° RR 180° Feathering laterally across tires (RR Extreme)...

I did have it set pretty well but we’ve rescaled it and lowered the car 1/4” since. Also took my measurements without someone sitting in the car so I’m sure it’s off a tad. I’m going to take another look at in today and rerun the numbers.

you should see what I’m looking at on my screen… I purchased the Performance trend software and the front roll center is ugly. 2.5” high, 12” right (this is what it was from the previous race)

Yeah I had a ton of RF travel (outboard mounted shocks, see motion ratio from earlier post) RF 6” LF 3” Going to stiffen RF from 650 to 800, LF 700 to 900, RR from 200 to 175

So how would I differentiate between the RR getting too much vs too little dynamic load? I was under the impression I was transferring too much load laterally and sliding the tire. The feathers on rr are toward the centerline of the chassis (laterally, not longitudinally)

I’m chalking this whole issue up to the shock package and shipping them off today to be redone like I mentioned in a prior post . Reference: https://www.physicsforums.com/threads/race-car-suspension-class.326355/page-51 Sent the shocks off to be redone and the shock expert said exactly what we...

Finally got to run Saturday night. Through processes of elimination, I firmly believe a shock change is due. Shop work Double checked all chassis mounts/measurements to make sure everything was square. Ran rear roll steer numbers and got about a 1/4” max trail in dynamic on RR 0 lead/trail on...

I’m slowly coming to terms with this idea. I did get to check the MR on every corner but the RF LF 2.5” shock travel to 1.5” spring travel(5:3) LR and RR and pretty close to a 1:1 ratio RF Guesstimate based on load stick #’s would be a 2” spring travel to a 4” shock travel 1:2 No spring...

I’ll have to get you that information later tonight or next weekend. I’ll measure middle of inner pivot point -> center of spring then inner pivot to outer ball joint. MR= D1 / D2 I figured that’s what you were getting at because I realized where those spring rates you recommended were coming...

Been doing my due diligence on this refrigerator with wheels the past two days, love some good math problems. Here’s what I’m guesstimating: Load transfers Front loads (measured with a load stick...

I think I’ve discovered a major issue. The LF has a 2.25” drop roll bar upper shock mount so it’s pushing the whole shock down and The shock is bottoming out. Here is what it has currently and I’m going to change it to a roll bar swivel style (yes, I know the phot is of a different roll bar...

No sir. Big spring car 5.5x9” springs on front 5x20” on LR, 5x13” on RR I just got some more measurements for you though: LF static compression 1” + 3.25” dynamic = 4.25x750= 3187lbs dynamic load RF static compression 1.5”+ 4.25” dynamic = 5.25x700= 4025 dynamic load RR static...

Here’s where the fun part is in my general curiosity: This exact set up feels pretty good on a tacky/wet track if not a touch tight mid off (needed to add cross) We also have screw jacks/weight jacks on all four corners of the car so we can smash springs to change load/ride height. I’m not...