Or just get coilovers :look:I did a SUM calibration today. Holy crap 4c worked exactly as I always wanted. For one drive cycle.
I'm tempted to capture the wave form from the first cycle and build a manual controller for 4c. It did what I wanted before returning to utter ****.
Welcome to my world. Except mine's best cycle is typically the 2nd one after a re-cal.I did a SUM calibration today. Holy crap 4c worked exactly as I always wanted. For one drive cycle.
What do you mean by manual controller? Will it do proper active-chassis stuff like APPROPRIATELY stiffening the rears under acceleration and the fronts under braking and the outers while turning, etc? Recording the SUM's output(s) -- "THE wave form"? -- won't help much when it comes to proper decision-making. Even if you captured all 4 outputs and also captured all its inputs, that still wouldn't necessarily reveal what's going on ... some IF statements lead to very non-linear results... What we really need is access to the controller's decision-making software...I'm tempted to capture the wave form from the first cycle and build a manual controller for 4c.
Oh, you noticed... According to Volvo, you're not supposed to do that!It did what I wanted before returning to utter ****.
When 4C behaves acceptably well in an R, it tends to bring out the Irv Gordon in us all. (I've expressed this to Volvo, but it fell on deaf ears connected to dysfunctional twisted corporate greed-head brains.)peterjk4 said:You and me both, it was fantastic put 55 miles on the car, and now its back to rough/jittery/harsh
Same here ... right after the system demonstrates how good it can/cound be, it reverts to floating like a butterfly and stinging like a bee. If waste is a sin, this is a pretty big sin.What kills me is it did that for the one drive cycle I after SUM calibration.
Your suspicion is totally incorrect. For one thing, at 100% (IOW, no PWM, just 12V...) these mighty dampers don't damp, they effectively don't move at all; you'd have had zero suspension. I've driven with a scope on the LR output signal for weeks and weeks now, so trust me when I tell you that if you'd have had a 'scope on the output traces, they would have appeared indistinguishable from any other driving cycle. Sometimes 4C does "a little" too much damping a few hundred microseconds too soon (counter-punching a bump, or else just hits the next bump unexpectedly while still very briefly doing too much damping following the previous one -- it seems like 4C could be trying to limit/halt suspension motion overshoot by momentarily stabbing the suspension brakes via very briefly calling for very high damping, and screws that up by starting too soon, clipping the end/top of the bump)... if the tires are not rock-hard, 4C gets (some of) its info some milliseconds later; if the tires are rock-hard, it's extra-painful when 4C screws up...I suspect that all 4 shocks were in full advanced mode 100% duty cycle while it learned.
I don't have a means of measuring inductance, but would still love to hear what you come up with, TIA!Logic says coil overs...
Now I have to deal with the joy of fooling the SUM I to silence. I'll be measuring the inductance of these units to see if I can figure out how to get it to shut up.
My 4Cs where great till I installed to TME springs this summer,now it crashes all the time. 4Cs have just 50K miles on them.My 4C was GREAT when I had brand new struts and TME springs. Great right up until a solenoid on one failed and there was a great deal on KWs.....