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He's like the project leader for the company that he works with, and I don't know how tight the security is for his company, so I would say to get in trouble over for not being to wait 3 more hours to check this forum and make a post would be kinda silly.
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So what is the optimal angle for the FLCA?
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^ Depends on your ride height and strut angle as well.
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Assume the chassis mounting point is infinitely adjustable, whats the optimal angle compared to the strut?
And where can I find these http://i24.photobucket.com/albums/c2...atebracket.jpg Can't find them on the PBM site. |
You need to figure out the CG of the car right, then you can figure out about where you would want your roll center to be, and thus, arriving at a conclusion as to about where you would want to place your FLCAs.
There isn't a "for this much lowering, the FLCAs must be at ____ angle" rule. It's all relative. Look up how to find your CG and roll center and stuff, there are plenty of racing suspension related websites that go into detail how you can calculate for that kind of stuff. |
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http://performanceshock.com/images/BookAndCD.jpg |
Will someone please clear the foam stuff out? Interesting subject, someone should start another thread on it (only with pics, those kids of threads fail without pics).
Thanks. It's too bad PSM can't hurry up! I want to see what their drop knuckle is going to look like! |
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The track rod is parallel to the ground which means it will effectively get slightly shorter through out bump and droop. The lower control arm is pointing upwards towards the hub. This means it will effectively get shorter during bump and longer during droop. During bump the effective shortening of the arm will narrow the track width of the hubs but because the steering doesn't change length at the same rate it steers the wheel towards toe in. Dunno if that makes sense?? But basically instead of reducing bump steer I think that the psm knuckles increase it dramitically. Kev |
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YouTube - Tomei / Cusco WRX STi Time Attack Car
Goes over some of the suspension mods for the Cusco STI including the custom uprights. |
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I personally ran kazama tie rod ends on my car for about a week. Just from driving on the street I thought that I could feel moree bumpsteer. The car darted around more when you would hit bumps with one side of the car only. After that experience I decided that I wasn't going to mess with the steering geometry untill I was going to mess with the roll center as well. Once my setup is all done I am going to set the tie rod end spacing using a bump steer guage. |
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Just do a search for chassis foam on google and that should be like one of the first links to show up. He went through the whole thing pretty thoroughly, so if you still have questions after that, I'll try to relay the message to him and see if he'll make a post or at least reply to your questions. Looks like he's been pretty busy lately, so that would explain why he's not been on here. |
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The front upright looks like it has a pretty big drop. |
IIRC STi's run a multi-link set up not too much different than 240's
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BTW, I ran SPL tie rods ends on my first car and they are magical. Definitely improved my bump steer. Just spaced them down to be parallel with the LCA.
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^I did the same but lowering the car makes it garbage... after i corner balanced the car the guy that did the work made me raise it... car felt so much better.... but i think it had slightly less grip in some respects i dunno.... but easier to drive...
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My car was slammed on Tein Super Drifts. Soooo, you did something wrong.
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I've noticed that with stock FLCAs and stock tie rod ends, the car does have a little bit of bump steer, but it's not that bad at all, and my car is slammed on Stance GR+. |
i have spl tie rods and the flcas and tie rods were parallel.
That being said, the car felt bumpier, shittier, rolled more, was more out of control. it was all quite pronounced and noticable. Raising it back up, car felt more controllable, more compliant, significantly less roll, etc... That's why I want the geometry all corrected properly while get the benefit of being lower (from a functional not look perspective). I don't drift, I track for lap seconds around a road course. |
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oh thought you were one of those guys who were just like "tell me the BEST EVAR SETUP!" type of poster. Sorry! hehe.
Anyway. I've played with roll center a bit and after adjusting it here and there my chassis was at it's happy spot with ~30mm of height in the front and 15mm in the rear. When I had it at about 50mm of adjustment I would get sudden understeer through corners, which could be due to the shocks bottoming out, or just too much roll center adjustment vs the rear, or in other words the front being too high vs the rear. http://i7.photobucket.com/albums/y25...g?t=1264141311 You can tell in the picture that the pivot points of the LCA is pointing up, significantly increasing roll center height.. This was with ~50+ mm roll center correction. I'm sure the car would've handled mo-betta if I had more adjustment in the rear, as the rear arms were still angled down, rather than up. So going back to your question, it is highly unlikely that you'll find a solid answer; all things (sway bars, suspension settings, springs, wheels) affect roll center among other things. |
To be fair my question was vague and sounded very lazy. Sorry!
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HEY!
So a few pages back i posted pictures of my modified my ae86 knuckles and boxed lower control arms. anyways UPDATE! i have installed these. Boxed lower arms shortened knuckles megan tie rods battle version nrca energy bushings trd 8k 6k springs kyb agx shocks Now this setup rocks! full lock is wicked. no rubbing, does a circle like crazy, road feel and steering response is sweeet. i want to shorten another set MORE and see what happens. next project is to make some rear traction brackets and weld up a panhard bar. |
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I thought you meant that your car's bump steer was worse after you fixed the arc... But to be honest, unless the FLCAs were also spaced down via roll center adjusters or whatever, the tie rod ends shouldn't be spaced down either, since that'll create two different arcs and could cause bump steer to get worse. Anyway, fix your roll center and make sure nothing is binding up man. |
Awaiting anxiously mmdb's review on driftworks stuff.
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That video of the Tomei/Cusco Impreza has me brainstorming, and I've been drawing up some stuff. |
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The driftworks stuff is likely very good, but for THAT much money the damn things should come with sphericals. I'm willing to bet that that is the only gripe that anyone will have about those. The design looks pretty damn good, though I do wonder how heavy they are.
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