Is our suspension setup correctly by aftermarket strut MFR's? Is the bias correct?

[2faststealth4u]

I was looking up coil overs today and after reading this post I am getting picky.. Reading almost every coilover in my price range was 14k front 10k rear

[J. Fast]

Has anyone looked into ISC coilovers? I don't know if many 3000gt people run them but they are quite popular on the subaru platform. I have them in my suby and I really love the way it handles. I'm not a serious track racer though, and I don't know a whole lot about shock dynos. I've just done a few autocrosses for fun. But ISC's are supposively made in MA so maybe they would be willing to work with someone on custom spring rates or dampening. They were able to get me sti coilovers with different top hats for my 98 impreza, and special rear adjustable camber plates.



Shock Dyno Results | ISC Suspension NA


ISC COILOVERS

Those plots look pretty good. 60-70% critically dampened at low speed and 30-40% at high speed. Nice progression.

[J. Fast]

I was looking up coil overs today and after reading this post I am getting picky.. Reading almost every coilover in my price range was 14k front 10k rear

Select your tires, weigh your hubs, brakes, lug nuts, wheels, tires (all un-sprung weight) and then corner weigh it and call me bro. Those spring rates aren't right for a performance improvement. I don't think you can spring that high with a street tire. That's DOT slick territory and requires big ass brakes for the grip associated with race comp tires. Select 10/10 springs at most with a street tire and have them valved for 60-70%Cc in low speed and 30Cc in high. You will have to custom order them and do some weighing and measuring. Off the shelf = not right. Might be wise to call Jason Daniels at Vorshlag or Andrew @ GTWorx and have them help you package a setup. We have 0 suspension support for this platform. I sought my answers from Evo, Porsche, and Hyundai suspension engineers and cleared, plowed, and paved my own way. OT = You still in Michigan bro? When you come to visit come see me and scope the fleet, they're ridiculous!

[2faststealth4u]

Select your tires, weigh your hubs, brakes, lug nuts, wheels, tires (all un-sprung weight) and then corner weigh it and call me bro. Those spring rates aren't right for a performance improvement. I don't think you can spring that high with a street tire. That's DOT slick territory and requires big ass brakes for the grip associated with race comp tires. Select 10/10 springs at most with a street tire and have them valved for 60-70%Cc in low speed and 30Cc in high. You will have to custom order them and do some weighing and measuring. Off the shelf = not right. Might be wise to call Jason Daniels at Vorshlag or Andrew @ GTWorx and have them help you package a setup. We have 0 suspension support for this platform. I sought my answers from Evo, Porsche, and Hyundai suspension engineers and cleared, plowed, and paved my own way. OT = You still in Michigan bro? When you come to visit come see me and scope the fleet, they're ridiculous!

Yeah I'm up here decided might as well go to U of M then relocating to Aurora in a few years but ill be that way hopefully in the next few weeks .. I get on the c3s and troll around a bit ill say hi on there when I do
And yeah before I purchase any of this ill ring you.. You can buy quality coilovers for a focus but not our platform? Chit is cray

[J. Fast]

Had my first navigator ride today, DK77, since getting the latest coilovers revalved and fine tuned. I should never have to make another big adjustment unless I put on rain tires. Words can not express how happy I am with the grip and ride feel. Flat turn-in, neutral feel, minimal body roll, grip and power everywhere. I actually wish I would have modded the suspension first now. I

I've two test and tune track days planned for this next week and then it's time to commission for racing.

[Nihil]

Had my first navigator ride today, DK77, since getting the latest coilovers revalved and fine tuned. I should never have to make another big adjustment unless I put on rain tires. Words can not express how happy I am with the grip and ride feel. Flat turn-in, neutral feel, minimal body roll, grip and power everywhere. I actually wish I would have modded the suspension first now. I

I've two test and tune track days planned for this next week and then it's time to commission for racing.

So what are your final suspension specs then? This is great news!

[DK77]

Riding in J's car is ridiculous LOL. He could flick the steering wheel at 75 mph and cut across 3 lanes and the car didn't protest at all. I'm pretty sure had I not been buckled in he could have thrown me out the window just with the G-forces he could pull doing a hard corner at pretty much any speed he wanted. Unfortunately now I'm going to drive my car and just be like what the hell, this handles terrible compared to that haha.

[J. Fast]

So what are your final suspension specs then? This is great news!

WinGeo geometry yielded .85 motion ratio for the front and .96 for the rears. The springs I selected based on my corner weights, corner un-sprung weights, suspension travel, aero considerations, and tire selections were 628lb rear and 600lb front. My setup is digressive/digressive in compression/rebound and 65% critically dampened at 3in/sec. Tire is a BFG R1 Road Race. Stock sway bar in the front, stock bar in the rear. + 3/F 2/R camber, 0 toe, + 2 caster. Don't mind sharing, means nothing without explicit knowledge of my setup, internal shock shim-stack configurations, and knob positions... my setup is unique. One last thing... Big thanks is due to Peter Zlamany at SCR Performance for fielding questions and teaching me hands on how to optimize race suspensions. Guy spent some serious time working with me until wee hours of the night to help track prepare and test, and most importantly understand my data acquisition.

[2faststealth4u]

From now on I'm calling the company before ordering. So the whole 10k front 12k rears worked well then.. Hmm maybe even 12front 14 backs

[J. Fast]

Might be a little drift car biased with a rear spring that hard and no aero or rake with a stock sway bar. Equal spring rates puts you in the ballpark for neutral handling. Really depends on each setup... 742lb rear springs might work well with no rear sway. Best grip scenario is no sways and some compensation for droop on a spring divider and compensation for it in the shocks. Independent 4 wheel suspension is very compliant. I've tried 5 sets of dampeners, 12 sets of springs, sways, no sways, helper springs, dual rate spring setup, single knob dampeners, dual knob shocks, 3 knob adjustable shocks, 4 OEM shock/spring combos and several variations of brake and wheel/tire combo's. Kinda got a real good picture of okay/good/better/best and how each grips and what I like.