Quote:
Originally Posted by garickman
... Taking the shock off the lower control arm has reduced the load on the spindle. .... The push rod mount on the top of the spindle is being redesigned to take some of the angle out of the push rod. He wanted me to add (as some people have already pointed out) it is difficult to know exactly what is going on by just looking at the few photos I have posted.
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I disagree that it will take load off the spindle. It has changed the loads, yes, but not taken them off. The lateral and fore aft loads are still applied through the spindle but now a moment has been added about the attachment points with now a shorter moment arm. In addition, the "vertical" load from the shock / spring has now been moved from the lower ball joint to the upper ball joint. However, the ATS spindles are 6061-T6 and OE Vette spindles are A356-T6. So you are gaining some strength and elongation there which is a big plus. Whether or not you'll have an issue depends on so many other things like vehicle weight and distribution, tire diameter, and on and on, that really no one can tell you for sure if this is an issue within pro-touring operating use.
Good to hear the push rod angles are being optimized. It was very hard to tell from the pics whether or not it could be an issue, but it looked like there was a good chance that at least you'd see undesired variation in spring rates.
Quote:
Originally Posted by barraza
Do what you want, but a viper and corvette both have upper links that provide fore and aft locating of the spindle (both use A arms). All IRS's I have ever seen have either triangulated control arms (a arms), trailing links, or trailing arms, or a combination thereof. Nobody makes an IRS rear with a single, unbraced upper link
I would take their engineering over a street rod builder.
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I think the OP was mainly concerned with function, and not whether or not this was the optimum IRS style. It will work without toe links. Yes, most other IRS's have a toe link, but there are not many "swing arm" style IRS's out there, but there are some good ones. Check out the previous BMW X5 rear suspension for instance. Quite different from the OP's suspension and does have two upper links, but not really a toe link. Nor are the upper links all that effective at completely limiting roll / twist as they have rubber bushings.
Lots and lots of things that may or may not achieve ones goals.
Good luck to the OP and his builder!
