EVS tuning adjustable lower ball joints installed

[optronix]

Recently got around to doing some springtime mods in preparation for the fun season. Previously I had installed Eibach Pro-kit springs, and was pleased with the aesthetics from the drop but was quite disappointed in the increased understeer introduced from the additional rear camber vs the front due to the strut/multi-link suspension geometry. I was left with ~-1.5 front and -2.5 rear camber after the springs install. I am now sitting at -3.5 front camber in the most aggressive setting. Turn-in is noticeably improved from just mild street driving, I can't wait to get this thing in a setting where I can assess the expected elimination of understeer.

I would suggest anyone who has springs or coilovers (without "top hat" camber adjusters) to invest in these (there are a few options available, including Whiteline and I believe J's Racing, to name a few), because as previously mentioned the rear camber is going to be more affected than the front when the car is lowered. The alternative is to get a rear camber kit to add more positive camber to the rear to get it closer to factory spec. But for me, having more negative camber in the rear than the front is a net negative for this platform. I chose to "lean into it" for a more aggressive alignment because I don't put many miles on my car and also do track stuff.

And then there's the aesthetic advantage. Honestly the pics don't do it justice. The camber really does add just a bit more subtle aggressiveness to the overall look of the car without going full obnoxious "stance style"- especially when combined with the +45 offset wheels and the drop. Forgive the relative uncleanliness; I have yet to do the spring detail.

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Before and after for reference:
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[StingertimeNC]

Tasty! Really making me want to do this mod as well. for the track What is optimal? -3 up front, -2 in the rear. Still on summer tires. I think I remember @Victorofhavoc saying something like -3 front with street tires. Maybe I'm thinking of one of Zygrene's vids.

 

[Victorofhavoc]

Tasty! Really making me want to do this mod as well. for the track What is optimal? -3 up front, -2 in the rear. Still on summer tires. I think I remember @Victorofhavoc saying something like -3 front with street tires. Maybe I'm thinking of one of Zygrene's vids.

Depends on the tire really.

Generally speaking for stock travel:
A sticky 300tw or more endurance minded 200tw will like -2 to 2.5 up front on a mcstrut
A super sticky 200tw -2.3 to 2.7
A 100tw -2.5 to 3.5
A 40tw -3 to 4

Tires that like higher tire pressure can tolerate lower camber curve. Higher camber can help lower pressure needs.

Lower the range of travel increases camber needs and/or tire pressure depending on the tire.

Add front bar to reduce roll and you need less camber/pressure.

The only way to truly know needs is to get a pyrometer and measure. Second best way is to track wear and chalk the sidewalls to measure rollover.

Also keep in mind that increasing neg camber typically decreases braking and acceleration in a straight line, which is why increasing castor (to increase dynamic neg camber like the c8 does) provides better overall performance.

 

[optronix]

I went as far as -3.5 primarily based on Zygrene's and others feedback, and my own anecdotal evidence that the tires really just want to pull themselves right off the rim. My theory is that if I notice any detrimental effects I have the rest of the life of these PS4S to use as a barometer before wasting an expensive set of 200tw in a couple months, and if necessary at that time I'll back it off to -2.5.

FWIW Zygrene has decided that -4.2 is too much for his use case and wants to fall back -3.5. Ben (PointbyPatrol) also wants the sweet spot of around -3.2.

I will also get a rear anti-roll bar; I'm not screwing around with the front right away lol. But yes that's next on the list, probably do it same time as exhaust.

 

[Victorofhavoc]

It definitely depends on many factors. Every driver is also different. Even in F1 the same team with the same car will run two different setups for each driver, and they play at a consistency level we can't comprehend. If you're harder on trail braking for example, you'll get more rotation and need less camber.

You're lowered so you're starting at an already higher static camber need. If you chopped the bump stop to gain clearance, more neg is required.

What tire pressure are you running?
Are you keeping a logbook?

 

[StingertimeNC]

So on Track, Conti Extreme Contact 02 tires, 275/30, 19 inch, (these are 240 TW summer tires) I'm running 45-46psi front, in order to keep the tire from rolling too far. Running 38-40psi rear. Interestingly, that increased pressure seemed to improved stability under heavy braking. Rear end is far less squirmy. I wonder if adding an eibach front sway bar is the way to go. Hoping to move to 200TW tires once these continentals wear out. Maybe just leave the front set at -2 camber and not worry too much about it.

 

[Victorofhavoc]

So on Track, Conti Extreme Contact 02 tires, 275/30, 19 inch, (these are 240 TW summer tires) I'm running 45-46psi front, in order to keep the tire from rolling too far. Running 38-40psi rear. Interestingly, that increased pressure seemed to improved stability under heavy braking. Rear end is far less squirmy. I wonder if adding an eibach front sway bar is the way to go. Hoping to move to 200TW tires once these continentals wear out. Maybe just leave the front set at -2 camber and not worry too much about it.

That's all sounding about right. With toe close to zero or slightly out, I'd bet most people would find the car fairly neutral to oversteer prone under trail braking.

You'll find the 200tw need less tire pressure because their sidewall is a lot stiffer than comfy ecs or ps4s. More bar can be helpful, but my 2c is to do tires first and see how you feel. You may find you want to run a different 200tw or that after 12 sessions the 200tw fall off enough that your driving style and setup needs adjustment. One change at a time makes things easier to account for .

 

[StingertimeNC]

Awesome, thank you.

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