srovner

Hi Everyone,
I am hoping to get some advice about the following:

I have a 2006 with stock sway bars (300 front; 311 rear) and Ohlin DFV Coilovers with 10/8 Springs. I want to reduce body roll some more. I bought a set of the Swift 12lb springs from Patrick at Urge Designs but have not yet installed them.

Would it be better to install the Swift 12lb springs so I would have 12lb front/10 rear OR leave 10/8 current springs and install the bigger CR front sway bar?

I currently run my Ohlin 10/8 5 clicks back from full stiff all 4 corners; I have 7.5" front wheels; 9" rears; light-to medium aero; very aggressively driven car.

Thanks, guys.

Scott R.
Colorado

B serious

Springs and swaybars will definitely help with body roll.

What is your indication that there is too much roll? That may help answer your question.

Car Analogy

To see the impact of upping yhe spring rates or swaybars on front rear balance, use my suspension calculator spreadsheet. IM your email address, and I'll send it to you (anyone else welcome to as well).

You type in spring rates and swaybars, it will show you front vs rear balance as a percentage. Will also show you natural frequency.

It will also let you compare your values to stock balance for each iteration year.

Apex1.0

RedCelica

I run 6/5 clicks, feels great actually. 10/9 was way too soft for my liking. Bump em up!

B serious

He runs 5 clicks back on his 10/8 springs.

srovner

Hey Guys,
Thanks for your comments. I tried opening/accessing member CarAnalagy's suspension spreadsheet but noting open up to add my suspension values/numbers. To help everyone better understand my problem, I have a Lotus Elise that is almost totally flat throughout tight turns. There is virtually no body roll at all. I am trying to make my 06 AP2 a little flatter especially during tight turn ins fully powered up. Some of this may simply be the Lotus has a really stiff chassis and sits even lower than my AP2.

I am convinced going to 12lb front swifts/10 lb rear springs will help improve my AP2 without sacrificing too much ride quality. I feel the OEM stock sway bars on an 06Ap2 are ridiculously too soft for my liking.

Thanks guys.

Scott R
Golden, COLORADO

srovner

I forgot to mention my current AP2 does not dive too much during hard breaking. I do really like that! I installed the CR quicker steering rack and Flashpro so my AP2 is a higher performance than stock. I think reducing body roll will enable faster turn ins and permit harder acceleration coming out of the hole.

Scott R

noodels

Just installed a CR front ARB on the standard 10/8 kgs and improved roll from <04 MY>300/311 oem ARBs 10 clicks front & 9 clicks rear.
Roads are bumpy in my parts of UK
Found my fronts springs had sagged a little and gave another 2 turns spring preload,can feel the oem anti squat/dive top arms<set at 5deg> working better when hard braking, now rear is 2-3 mm higher allowing for full fuel tank ect.
That's the issue I have when putting a lot of fuel in, the 8Kg does not feel strong enough & thinking a 10Kg all round set up in the future.
Rear preload 15mm with 8Kgs
11kgs x4 would be nice,though cutting costs 10/10 would be my better option.

B serious

Stiffer springs and swaybars will help you corner flatter.

Wider wheels and tyres and roll center adjusters will help also.

All that may or may not help with grip.

But...street car setups are more about feel than actual result.

I'm assuming this car isn't being used on a track or analyzed for body roll rates. It just doesn't feel like an Elise?

The Elise is lower and probably proportionally wider...and has the mid engine steering feel. Idk if the chassis is actually stiffer.