Rear Sway Bar Adjustment

[Tiramisu]

Hello,

I am finally getting around to installing some sway bar upgrades (21.5 front and 19 rear) I purchased from a cool guy I met here at Pelican.

I got the front bar installed ok (just waiting for some Rennbay bracket braces) but I have a question regarding the rear bar. On the bottom of the drop link there looks to be eccentric (did I spell that right?) adjustment? I looked in the Haynes manual and didnt see anything about how this should be adjusted and what effect it has. Do I need a special tool or ? Any help on setting this up would be appreciated.

Thanks

[Cocacolakidd]

Hello,

There is not an adjustment on the rear bar - no extra tools needed either - that is if the drop links and bar are all OEM Porsche. Are the drop links factory or has someone changed out something with them? If someone has added a pre-load type eccentric bolt it can be replaced by a standard straight bolt in this area. An eccentric bolt would give a small amount of pre-load but it is doubtful it would be useful in such a small amount. Two straight bolts holding the drop links and rear sway only.

[Tiramisu]

Everything looks to be stock to me. I will snap a picture tonight and you can let me know what you think. Thanks for the reply.

[flash968]

if you have the M030 19mm rear, there are 3 holes on each lever arm - placement allows for effective rate change - placing the link in the hole nearest the torque tube, thereby shortening the arm, makes the bar stiffer - conversely moving the link toward the end of the lever makes is softer

depending on your setup, a stiffer rear bar generally moves toward oversteer, and softer moves toward understeer

the eccentric at the bottom of the droplink is for camber adjustment

[The Glademister]

I'm pretty sure what you're referring to is part number 477 511 515, camber eccentric. A pretty nifty piece of hardware that not only secures the end of the rear sway bar but also serves as a rear camber adjustment. There is no need to loosen the bolt on the inside of the trailing arm but you will have to take off the nut on that bolt to get your sway bar on. There's a large bolt head (19 mm?) on the outside of the trailing arm that you can put your wrench on to keep the camber adjustment while you loosen the nut. As far as rear sway bar adjustment - that would be multiple bolt holes in the ends of sway bar. The 968 M030 rear sway bar has three adjustment and there's one available from Lindsey racing that has five. I think your OEM 19 mm sway bar probably has only one attachment option.

[smokin_944]

Are you sure about this setup? If they are OEM sways, a M030 19mm rear bar on the back is a lot of bite for a small front bar. You will have to run the rear bar on the softest setting. Even then the match up seems a little off. I think you might need a fatty on the front, a 26.8mm or even a 30mm bar to even things out.

[Tiramisu]

Thanks for all of the help on this. I looked at my rear bar and it is not the M030 bar as it only has one hole. The camber eccentric bolt came with the droplinks that I purchased on ebay so I am going to assume they are already on the car (I have not taken the wheel off to take a look yet). After looking at the bar more closely it might not be a 19mm bar but perhaps 14mm as it seemed fairly thin compared to the front bar. I will check the diameter with a micrometer just to be sure tonight. I found a part number on the bar but it was hard to make out. I am pretty much clueless when it comes to car setup. All I know is that I want to make the car generally neutral and perhaps 19mm is too much it sounds like?

[Tiramisu]

Here is a picture of the droplink with the camber bolt. So if this bolt is not on my car do I assume the car has 0 degrees of camber in the rear or does the 944 have a set degree of camber built into it?

[krystar]

if the eccentric isn't on the car...u wouldn't be able to adjust the camber. but that doesn't mean the camber will "rezero" itself. it'll just be at whatever position the 2 securing bolts holding the swing arm to the spring plate is.

[Techno Duck]

Cars with no rear swaybar still have the camber rear eccentric, the difference is it will not be a double sided bolt. You just need to replace the bolt. Camber will not change as it requires turning the eccentric to get the spring plate to move (that is why it has the offset 'cam' on the bolt base). Just put it back in the same orientation.

The rear bar you will have is either a 14, 16 or 18mm. The later two being a little much for the 21.5mm front. I would try and find atleast a 25.5mm front if its the 16mm bar or up.

[Tiramisu]

I measured the rear bar and it was in fact a stock 14mm bar so that is good news. I was worried that I was going to have buy another bar. Thanks everybody for the help!

[krystar]

how is that good news? 14mm is the stock bar. more rear sway = more fun.

[Tiramisu]

My car didn't come with any rear bar so 14mm will be plenty of adventure for me!

[krystar]

u should buy the m030 19mm adjustable. hehe

[Tiramisu]

Today I tried to install the rear bar but could not get the camber eccentic bolt out of the trailing arm. I think the bolt has rusted a bit. Is that bolt threaded into the arm or can I whack it out with a hammer?

[krystar]

the securing nut is on the other side....u did remove it right? it's a 19mm nut

[Tiramisu]

Yes I took the nut off but that is the least of my problems now. Disaster struck while installing the front bar

[krystar]

uhoh. what disaster?

[Tiramisu]

While installing the rennbay bar bracket (keeps the stock bracket from flexing) I broke one of the crossmember bolts that it attaches too. No idea what to do about it yet.