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-   -   WTF, 3 different alignment specs for an E46? Any alignment gurus out there? (http://forum.e46fanatics.com/showthread.php?t=606207)

thefitter 09-06-2008 08:40 PM

WTF, 3 different alignment specs for an E46? Any alignment gurus out there?
 
Anyone know why I would find 3 different alignment spec sheets? I have 1 from the dealer, 1 from an independent BMW shop and one from a Goodyear tire shop that does other automotive repairs. All 3 are using Hunter alignment racks and all three are different. I have found reference online to the specs from the indie shop and the Goodyear shop but not what I got from the dealer. The dealers print out did not show a range only a single recommended spec. Oh and… from what I can tell it’s NOT due to wheel size.

I have no idea what I should set this car up too. It’s really dumped and I have adjustable rear camber arms but not front camber/caster plates. I want the handling to be aggressive but I do not want to eat up the new PSIIs I just put on.

A tech at the dealer said that since the suspension is so far from stock that stock specs do not apply and that I need to find a “suspension guru” that really knows how to properly align a dumped car.
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jpr 09-07-2008 09:52 AM

Here's the alignment tech thread - http://forum.e46fanatics.com/showthread.php?t=416660

If you post the various spec sheets you've got, I'll bet you'll find one is the sport settings, one is either the standard or the E36 settings, and the one from the dealer is the ride height compensated version.

Generally speaking though, this will get you in the right range for what you want and then can further tune to taste from there -
Front: -1.0 to -1.2 camber, zero toe
Rear: -1.7 to -2.0 rear camber, total toe of 0.18 to 0.22

thefitter 09-07-2008 09:08 PM

Thanks, but the Bentley manual seems to have different specs also! I think my head is going to explode! I have never with so many differing "technical specifications" in my life. I'm begining to think this is art not science.:hmm:

I will try and scan all these and post them. I posted this yesterday on a another forum.

http://forums.bimmerforums.com/forum....php?t=1076560

jpr 09-07-2008 09:45 PM

Quote:

Originally Posted by thefitter (Post 8497448)
Thanks, but the Bentley manual seems to have different specs also! I think my head is going to explode! I have never with so many differing "technical specifications" in my life. I'm begining to think this is art not science.:hmm:

I will try and scan all these and post them. I posted this yesterday on a another forum.

http://forums.bimmerforums.com/forum....php?t=1076560
Quote:

I'm sorry I guess I was not very clear. What I meant was that I got print outs from the alignment machines showing what the specs should be. And they had different data in their programming for the same vehicle.

For instance the left front camber:

BMW Dealer Spec Range -0.6 0.0

BMW Indie Spec Range -0.7 0.0

Goodyear Spec Range -1.1 -0.4

(I converted these so they use the same format.)

Dealer Spec range = standard suspension specs, ride height compensated

Indie Spec range = standard suspension specs

Goodyear spec range = sport suspension specs

thefitter 09-08-2008 01:13 AM

What do you mean by ride height compensated?

The dealer printed me 2 different spec sheets, one for a "BMW 99-06 E46 Coupe 17" Wheel" and "BMW 99-05 E46 Sedan/Wagon 16" Wheel", both spec sheets are identical.

From your post it seems the best specs for a dumped E46 would be the Goodyear ones. When we were picking the data lines in the Goodyear computer it only offered two choices standard and sport. Even though my car was not purchased originally with sport I choose that due to all the after market suspension mods. I'm going back to the shop and get a standard printout to compare. If its the same I will scream!:yikes:

thefitter 09-08-2008 01:26 AM

Heres another example off the three sheets:

For instance the left rear camber:

BMW Dealer Spec Range –1.8 -1.2

BMW Indie Spec Range –1.8 -1.3

Goodyear Spec Range –2.3 –1.8

(I converted these so they use the same format.)

jpr 09-08-2008 05:45 PM

Read the thread I linked in post #2 and all your questions will be answered.


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