IRS alignment setting for wide rear tires

[Panelfantastic]

Ok, I figured out where I saw it... Feb '04 Excellence. Article near the back about tuning coilovers on a 911. Shows pics (page 146) of the slotted mount, NOT a hiem like I thought. Would be very easy to duplicate.
Sandeep, I'll try sending you a scan from the page. It shows specifically what you want to be able to do.

(I would post it, but I think that's a big copyright no-no )

[boygenius]

As long as your not doing it for profit and you list your source the copyright police shouldn't have a problem with it.

[Sandeep]

Thanks for the pic Panel. It makes sense now. I was looking on the web and found a similar pic.



This is from the Rennwerks website where they are restoring a GT2. Look at the trailing arm mounts and see how they are adjustable for camber.

Sandeep

[Sandeep]

The more I think about this, the more it makes sense .. I want to go with a coilover / 935 style springplate rear suspension in the future, and it would be cool to lower the car AND have proper camber for WIDE rear tires.

I saw a pic of a 911 RSR buildup with 17x11 rears and in the article, they lowered the rear of the car and kept the camber in check with the camber boxes.

MAKE IT SO !

Sandeep

[Rob]

Hey Sandeep,

Let me know if you are going after this. If you get a mchineshop to make the mounts, you can have them make me a set as well

Rob.

[Panelfantastic]

Yeeesss! Welcome to the dark side!
Gotta have the steamrollers out back!

What could possibly be wrong with a contact patch like this???

[boygenius]

Will my 944 late aluminum trailing arms have enough camber adjustment for 18" X 10" rears.

Which bolts adjust camber? The eccentric bolt for the sway bar or the eccentric bolt in the spring plate.

[paul_f]

Originally Posted by Sandeep

Thanks for the pic Panel. It makes sense now. I was looking on the web and found a similar pic.



This is from the Rennwerks website where they are restoring a GT2. Look at the trailing arm mounts and see how they are adjustable for camber.

Sandeep

How do you lock this mounting point into position though?? I have seen the clamps on IRSed buses move before - so surely it must happen hear unless the use a toothed adjuster or something??

This way is better than a rotating clamp as you won't get as severe toe changes with the change in camber.

Hey Panel can I have a copy of that picture too please

[Panelfantastic]

Sure Paul but it's not as clear as the one Sandeep posted. I'll try to post them here so everyone can see.
These were taken from Excellence magazine so all rights are theirs... If I get in trouble, I'm sayin' boygenius told me to

[boygenius]

Originally Posted by paul_f

How do you lock this mounting point into position though?? I have seen the clamps on IRSed buses move before - so surely it must happen hear unless the use a toothed adjuster or something??

This way is better than a rotating clamp as you won't get as severe toe changes with the change in camber.

Hey Panel can I have a copy of that picture too please

You could thread both the inner and the outer pieces of metal in the pivot. Next you could remove some of the threads about a 1/2 inch from the base of the adjuster bolt. You can thread the bolt through both pieces of metal but as soon as the bolt goes through the bottom bracket it will stop threading in since the threads have been removed. If you can place a nut on both the top and bottom of the lower plate you can "LOCK" them together to prvent the camber from changing. Just an idea...

[boygenius]

I found this picture right here in the forums of a camber box.

[paul_f]

Great picture boygenius, mmmm now i need to get something made up for my bus!

Paul

[Bruce2]

You can adjust camber on VW trailing arms. Just loosen the bolts securing the trailing arm to the spring plate and allow the rear of the trailing arm to rise relative to the spring plate. If it won't go, file the holes into slots.

When I ran 225/50s I noticed the right tire was wearing out faster than the left. I measured the camber and found -1.5º on the left and -3º on the right. Eventually the left tire wore out completely even across the tread. When I replaced both tires, the replacements wore out the same.

[Panelfantastic]

Anybody have any tech info on what would be a good camber setting for a street car??

[Sandeep]

Bruce2,

Thanks for this information ! I will try your method first.

I'm going to try -1 deg front, -1.5 to -2 rear camber first, not sure about toe yet and see how that performs first. Still researching though. I'm looking to keep tire wear at a minimum but still agressive enough to have fun on the track.

Sandeep