noddaz Reader
Nov. 24, 2012 8:18 a.m.

The subject: 1997 Jetta GT The Mod: Eibach Sportline springs #4.5485

Springs are on the car. Springs are mounted on Koni STR.T struts purchased spring 2012. Car is back on the street. Lower control arms were replaced at the same time to take care of worn bushing/balljoints.

The problem: (Perceived or otherwise) Maybe the car sits too low? When I view the front suspension sitting on the pavement the ball joint end of the arms are slightly higher than arm inner pivot end. The arms are not sitting flat at rest. (see bottom picture page 30 of VW sport Tuning by Per for example) So far the Jetta is not exhibiting any bad manners during street driving. The car has not been driven hard yet. Should I be concerned? Should I try to find spacers to put under or over the springs to pick the car up about 1/2 inch? Inquiring minds want to know.

DeadSkunk Dork
Nov. 24, 2012 9:12 a.m.

The ultimate handling in mid-corner will be compromised by being that low. For street driving it will have minimal impact. It depends how you going to use the car.

noddaz Reader
Nov. 24, 2012 10:22 a.m.

The car would be used for normal DD and Auto Cross when I can...

mad_machine MegaDork
Nov. 24, 2012 10:35 a.m.

unless you are getting weird camber issues... I would not worry about it for a DD and occasional cone killer

92CelicaHalfTrac MegaDork
Nov. 25, 2012 11:45 a.m.

I don't think it'll be worth worry about even right now. While common thought with MacStrut cars says the arms should be parallel at the most or with the ball joints pointing down, all of my cars have gone the opposite way, and i've never noticed anything bad.

That said, i haven't really pushed the hell out of any of them but the MX6. (Which is also the worst offender. It handles great.)

series8217 New Reader
Nov. 25, 2012 11:53 a.m.
noddaz wrote: Maybe the car sits too low? When I view the front suspension sitting on the pavement the ball joint end of the arms are slightly higher than arm inner pivot end. The arms are not sitting flat at rest. (see bottom picture page 30 of VW sport Tuning by Per for example)

The angle of the arms to the ground is not relevant; you need to measure the angle vs. the strut axis.

The closer the arms get to being perpendicular to the strut axis, the less camber gain you will get from a given amount of body roll. If the angle goes past 90 degrees (i.e. the arms are angled way up), camber will go more positive with any further body roll. This is bad.

Ideally, your suspension should gain at least 1 degree of negative camber for every degree of body roll, and maybe a bit more depending on tires (and if you need to make up for some lost due to steering axis inclination).

With MacStrut suspension, its possible (perhaps likely) for a car to handle worse when lowered than at the factory ride height. The camber curve will invariably be worse, and you can even end up getting more body roll since the roll center may drop. That compounds the camber problem...

Travis_K UltraDork
Nov. 25, 2012 12:18 p.m.

The springs are junk, they are too soft and short, and unless you like crashing against the bumpstops hard enough to rattle the windows on the freeway and skipping sideways in a corner everytime you hit a tiny bump and use up the little suspension travel that is left, get rid of them and get some different springs. They will also wear the struts out way faster, and likely help crack the strut towers like vws like to do.

You'll need to log in to post.

Also on Grassroots Motorsports

From the GRM Vault: Subaru Bounces Back

2 days ago in Articles

Proof that motorsports involvement can lead to corporate success.

Your Projects: SkinnyG's V8 Pontiac Firefly

2 days ago in News

Talk about a sleeper.

Calling All LS-Powered Track Machines to Holley LS Fest

2 days ago in News

Holley LS Fest will once again feature the Grassroots Motorsports Road Course Challenge.

From the GRM Vault: A Dual-Engine Honda CRX and 10 Other Cool Cars Hit the Dyno

3 days ago in Articles

Back in 1997 we put 11 cool cars on the dyno in search of horsepower and truth.

You Need This: Our Mustang GT CAM-C Project Car

3 days ago in News

Soon for sale: Our Mustang GT autocross project.

Deal of the Month: Christmas in July!

3 days ago in News

Get a year of our magazine for just $10.

Your Projects: Smith College's $2017 Challenge Miata

3 days ago in News

Smith College is entering the Grassroots Motorsports $2017 Challenge

Big News From Mazda's Prototype Racing Effort

4 days ago in News

This just in: Mazda's prototype racing effort is changing hands.

Grassroots Motorsports LIVE! on Wednesday, July 19: Track Prep Your Daily Plus a Look at the Only Stick Shift GT3 RS

4 days ago in News

Tune in as we discuss pre-event inspection and prep. Also, a special appearance by a very cool Porsche.

Project Ridgeline Tows Home Another Project

4 days ago in Project Cars

We may or may not have gotten sidetracked on our Smoky Mountain Tour.

You Need This: Supercharged Toyota MR2

5 days ago in News

Rebuilt engine? Check. Extra power? Check. Early MR2 cool factor? Double check.

2017 Volvo V90 Cross Country T6 AWD

5 days ago in New Car Reviews

We're keeping the all-wheel-drive wagon theme rolling. We reviewed the Subaru Impreza last week and the Volkswagen Golf SportWagen before ...

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More
Ls6K3bDKO8l3AFnjlAYLXMThxV0KYqbE