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Thinking on it some more, I don't think it's a good idea. You probably can't get the cut end to sit flat in the seat, and given that C/O springs are not as stable as big springs that's a problem. Spring stability in general matters especially once the axle seats start rotating (this tends to...

Thanks for the explanations. I'm guessing that the AS math gets kind of messy once you start considering pitch. I wasn't really trying to see how the braking issue would relate to corner-carving (my avatar, sig, etc., notwithstanding). More as an item of interest for hard braking at the end...

Continuing the IC behind the car issue a bit . . . isn't it more likely for this to occur with a combination of shorter UCAs and higher rear ride heights? I do see the anti-squat value changing more rapidly with respect to ride height as the UCAs get shorter, which may be a good thing on...

It is not necessary to have a front bar in place in order to do a front end alignment. Without knowing anything more, I think you'll want slightly more than the preferred OE caster spec in order to provide a little more directional stability at the big end. Zero or slightly positive camber and...

I think what you need to do is first center the axle (shorten the passenger side UCA, lengthen the driver side UCA). Then adjust both UCAs the same amount in the same direction (i.e. both longer or both shorter) to bring the pinion angle to where you want it. It's when the UCAs are adjusted...

Re: Hotrod to ####'s Truck Arm Suspension A guy who used to post quite frequently on the montecarloss board said pretty much the same thing a while back, and my thoughts are that it's likely to depend on whether your cornering is mostly steady-state or highly transitional. There's more you can...

Re: Hotrod to ####'s Truck Arm Suspension Got to thinking a little more on this, and since the truckarms are clamped to the axle, they already provide you with some roll stiffness, kind of like being a rear sta-bar that doesn't look like one. Think of it as a virtual rear bar, maybe. IOW...

Re: Hotrod to ####'s Truck Arm Suspension Easy question first. Unless this is specifically for competition and you're going to do extensive testing, double adjustables aren't going to help you that much more than single-adjustables can. But I would consider SA's even for mostly street driving...

Re: Hotrod to ####'s Truck Arm Suspension Didn't take it that way. Mostly I'm curious as to whether Hotchkis did anything beyond stiffening up the suspension to keep it in the range where its geometry is at least "OK". BTW, I think it was Junior Johnson who first ran it, apparently because...

Re: Hotrod to ####'s Truck Arm Suspension I'm a little bit curious about whether the magazine article discussed things like predictability, as well as what made up the rest of the suspension. And what the Hotchkis setup was. I'm not a big fan of the OE converging/triangulated 4-link, and have...

Did you install the control arms and torque their bolts with the rear suspension drooping? If so, the static weight of the car has used up the "soft" part of the bushings' range of torsional compliance (flexibility). Loosen all of the control arm bolts, roll the car back and forth a few feet a...

No problem ;) Bushing material does figure into it, if you're looking at a kinematic (geometry) & compliance model rather than just the pure geometry effect that I was describing above. Since a bushing's stiffnesses (compliances) affect how accurately it approximates a spherical rod end...

Best overall street manners really requires a balance between the front and rear bars. Otherwise, there is the potential for being "loose" if you ever find yourself in a situation where you do have to corner hard. Normally, this is based on having front and rear wheel/tire packages of at least...

You've got a pretty strong case of what the corner-carvers in this group would call roll steer. What happens is that as the car rolls to the right, the axle steers slightly to the left. It's a geometric function of the rear control arm inclinations in side view and the amount of roll. In the...

When you say "leaves to the left" do you mean that the rear tries to head to the left on its own (forcing you to also steer slightly left to keep the rear end behind the front)? If so, I'm pretty sure I can explain it. I have no idea what you mean by "stretches out". Norm

Thanks for reposting this article, Fred. I saw later on in this thread mention of an ECU, and I'll say right now that you absolutely need to understand all of that stuff if you ever get into tuning EFI ignition maps. But when you do understand it, EFI ignition tuning is pretty simple and at...