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Post your competition suspension set ups here!

Old Jul 27, 2018, 10:13 AM
  #16  
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Originally Posted by Dallas J View Post
Do you know roughly your front and rear weight? Im 900/600 but should be 875/575 after this winter. That puts my NF in the 3.3f/3.55r range. So its keeping right in the middle of that 0.2-0.3hz split. I think I could even go stiffer in the rear depending how things are on concrete. But this is AX where I want the car to move because I need to yaw around element.

Track is certainly different where you need more of that throttle balance and need to keep stability to confidently push it. Similar to my Hill Climb friends setup, need to be able to push with out losing the rear.

And thats correct, no front bar. My geometry is fixed just about as good as I can get without making the car wider, and stiff enough overall that I can get to only using a bar as a trim device on the end that needs to be un-stuck. One thing we have noticed as a trend, every time we soften the front bar and stiffen the front spring, we get faster. So decided to go all the way and get that weight off the car at the same time. At first it was terrible on race tires and pretty fine on street tires. Just took more rear spring and less rear bar and things really started to work.

My rates certainly sound stiff on paper, but the car is totally composed even on our terribly bumpy lot. It just seems to absorb it all no problem to the point Im just not concerned with it anymore.
Sounds like ive been going the wrong way over the past year. i decreased front spring rate instead of going up on the rear. which is contributing to my front outer corner diving so much in turns. Think ill definately go back to the 16kg front and maybe even harder in the rear.

Im going to cornerweight it in the next month or 2 so ill know exactly what the cross weights are which hopefully then i might be able to figure out the correct spring rates. We put a stiffer front bar in and put it on full hard and found gains but i think that just proves that my front spring rate is waaaay too low at 12kg. esp with the aero and grip ive got on 280 slicks.

Im trying to slowly upgrade to all your custom wizardry! just sent you a PM actually. if you could let me know how much your LCA's are also i might package them together.
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Old Jul 28, 2018, 12:44 AM
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Originally Posted by Dallas J View Post
I think I could even go stiffer in the rear depending how things are on concrete.
yep, a lot more.

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Old Jul 28, 2018, 07:04 AM
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Megan Street Coilovers (Fronts 7kg / Rear 8kg)
Whitelines 26mm front sway bar
Whitelines 24mm rear sway bar
GT Spec Front Strut Bar
Whitelines Precision Steering Kit
Whitelines Rear Diff Bushings
dd Aluminum lower control arms
Solid driveshaft bushings
ABS deleted
STM Staging Brake Kit
Plate swapped Evo 9 rear diff
Qualfe LSD center diff
255/40r17 Bridgestone Potenza RE11A tires
Level of competition: Moderate. Car is setup for use on the street or drag strip
Few things I would like to do is go with a smaller brake kit on the front that would allow me to runs 15" inch wheel and a 24.5x8.5x15 slick. Otherwise I am overall happy with my setup.
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Old Jul 28, 2018, 10:59 AM
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Heres a shot of my upside down arms

Measured RAKE from pinch welds to ground (measured approx 6" rear of front tire & 6" fwd of rear tire)
  • 6.75" front
  • 7.5" rear
Need those SSB components

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Old Jul 28, 2018, 11:46 AM
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Originally Posted by MinusPrevious View Post
Heres a shot of my upside down arms

Measured RAKE from pinch welds to ground (measured approx 6" rear of front tire & 6" fwd of rear tire)
  • 6.75" front
  • 7.5" rear
Need those SSB components


Ahh, thats what I suspected. Angled down a little is certainly ok, but at a certain point you really do get some funky geometry issues.
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Old Jul 28, 2018, 11:50 AM
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Originally Posted by griceiv View Post
yep, a lot more.
Seems like Im pretty much at or beyond the limit of these flags and the crazier the rate the more it seems to matter. I may try and snag a set of 1300s but wont get a chance to test on concrete before nebraska. So, the question is do I just get them and swap in now or leave it all alone and compensate with air pressure at Nats?
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Old Jul 28, 2018, 05:20 PM
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Bad angle ,but when looking from directly in front, it may also be upside down. I could swear it was level.
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Old Jul 29, 2018, 01:45 PM
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FA510's 10k front and 11k rear.
The rear fork mount thingy is a little modded(see screenshot below)
Super pro offset lower control arm bushings in the front.
Whiteline roll center kit in the front.
Reardiff restacked
Rear diff/trailing arm and mustache bar poly bushings.
265/35/18 on 18x18.5 works wheels
Around neutral rake or a tad lower in the rear.

Here is a video of my rear suspension spliced with my autocross run. Pretty cool to see the rear in action.
https://www.youtube.com/watch?v=pb0e...ature=youtu.be

Got some extended mount in the rear from fortune auto(had to get the black mount part weld work to make it fit) so I can fit helper springs and have them work their full range.



Original left modified right


Modified sitting static
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Old Jul 29, 2018, 01:58 PM
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Watching that vid really looks like you're over dampened on rebound in the rear. You can see when it rolls over the tire lifts before it stops moving even. If you go of the notion of being somewhere around 0.65 of critically damped, that definitely shouldnt happened. This would be a scenario where damping is > 1. I wonder if its in feel of trying to compensate for probably needing more rear spring.

Now I could certainly be doing the same, and its probably something I should take a look at on my own car.
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Old Jul 29, 2018, 02:02 PM
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^^^Have never seen that lower modification done. I read your note about the helper springs but not sure why the C/O'r needed extending

Now, that Vid was pretty cool. Dont think Ive ever seen that particular shot of the EvO rear susp ACTIVE. Well done
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Old Jul 29, 2018, 02:12 PM
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I just picked up an extra GoPro.. I'm so gonna make videos like that LOL. Maybe by filming the front and back of mine, I can find some adjustments to make. That's a really good idea.
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Old Jul 29, 2018, 02:18 PM
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Originally Posted by kaj View Post
I just picked up an extra GoPro.. I'm so gonna make videos like that LOL. Maybe by filming the front and back of mine, I can find some adjustments to make. That's a really good idea.
Yes Jason. Now we can see our upside-down front suspensions working poorly (very upset over this)

Im not even that low compared to others. Still curious what your pinch weld to ground Dims are?
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Old Jul 29, 2018, 02:51 PM
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Originally Posted by MinusPrevious View Post
Yes Jason. Now we can see our upside-down front suspensions working poorly (very upset over this)

Im not even that low compared to others. Still curious what your pinch weld to ground Dims are?
My seams are a bit messed up due to "emergency" lifting at the track LOL. Mine end at about 1/8" below the flange where the lower part of the fender bolts to the car (see pic below). From that spot, I am 7 9/16" from the ground, or 192mm. So, give or take however much rail should be sitting below that fender tab. Hopefully that makes sense LOL. Google image search failed me and it's too hot/I'm too lazy to go out and take a pic

Last edited by kaj; Jul 29, 2018 at 04:21 PM.
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Old Jul 29, 2018, 02:54 PM
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7 9/16in and 39.7mm are two very different numbers...

Just measured to my seam, its about 6.75"
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Old Jul 29, 2018, 04:15 PM
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Originally Posted by Dallas J View Post
Watching that vid really looks like you're over dampened on rebound in the rear. You can see when it rolls over the tire lifts before it stops moving even. If you go of the notion of being somewhere around 0.65 of critically damped, that definitely shouldnt happened. This would be a scenario where damping is > 1. I wonder if its in feel of trying to compensate for probably needing more rear spring.

Now I could certainly be doing the same, and its probably something I should take a look at on my own car.
thanks for the feedback. What would you recommend me doing, higher spring rate in the rear and then soften the rear damper some? It's a daily driver so I wouldn't want anything crazy in spring rates.
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