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 Post subject: Re: C5 Suspension
PostPosted: December 8, 2016, 3:14 pm 
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Joined: October 13, 2011, 9:19 am
Posts: 1314
Location: Denver Co
ok so this is what i cam up with for this type of car in the front. thoughts? My other concern is that i need to flip the solstice uprights to work with the rack which may be an issue since the upright has some mechanical trail built in.


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You can build the most awesome thing in the world but at some point, an 80yr old man in a crx is probably going kick your butt on the track... don't ask me how I know.
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 Post subject: Re: C5 Suspension
PostPosted: December 8, 2016, 6:08 pm 
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Joined: April 26, 2008, 6:06 pm
Posts: 3019
Location: Under the weather. (Seattle)
A few things to keep in mind. Camber change with respect to roll is roughly 1/2 that with respect to bump. So .25*/degree roll (or 25% recovery) is roughly .5*/inch bump. Anti-squat is considerably less effective on an IRS than a live axle. And the actual weight acting on the tires is going to have more to do with their deformation under load than the weight distribution percentage, so a lightweight rear biased car with wide low profile tires will still have more problems getting them to grip off-angle than a heavy car with a somewhat more forward weight distribution.

The question of which sacrifice(s) to make is the really crux of all suspension design...Even at its best, everything is still just one big compromise.

In regards to the posted geometry, I don't think you're going to want a car with 0 caster and 0 mechanical trail. I've driven one, and while it amusing in its own way, I wouldn't want to push the limits on it...Especially if it were a low MOI mid-engine car.

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Last edited by Driven5 on December 8, 2016, 6:23 pm, edited 1 time in total.

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 Post subject: Re: C5 Suspension
PostPosted: December 8, 2016, 6:18 pm 
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Joined: October 13, 2011, 9:19 am
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Location: Denver Co
Yeah I didnt put any caster in the the suspension design as of yet. I generally keep it simple to start, after I get the rough geometry where I like it, I add in 5deg of caster and modify things from there.

I think the camber curve will work fine but... we will see once caster is tossed in. Scrub looks good to me along with the kpi, roll height (and it's vertical movement) and toe change

Any other thoughts? I still need to address the rear but it won't be too much different.

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You can build the most awesome thing in the world but at some point, an 80yr old man in a crx is probably going kick your butt on the track... don't ask me how I know.


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