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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Alignment specs with spacers.



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      03-05-2017, 11:34 PM   #1
agustincuenca
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Alignment specs with spacers.

I've been looking around and found nothing close to conclusive.
I'm doing front M3 TRW control arms this Thursday and taking it for an alignment the very next day. I know that adding these parts will make the alignment specs for the front as the E9X M3 factory specs but, the question is, does having spacers on affect any of these specifications by any considerable margin? I know adding spacers changes the suspension geometry to some extent but unless you go to crazy wide ones that change is ignored. I maybe overthinking this...
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      03-06-2017, 12:41 AM   #2
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Quote:
Originally Posted by agustincuenca View Post
I've been looking around and found nothing close to conclusive.
I'm doing front M3 TRW control arms this Thursday and taking it for an alignment the very next day. I know that adding these parts will make the alignment specs for the front as the E9X M3 factory specs but, the question is, does having spacers on affect any of these specifications by any considerable margin? I know adding spacers changes the suspension geometry to some extent but unless you go to crazy wide ones that change is ignored. I maybe overthinking this...
Good question! I will need alignment soon too and my research says modest spacers will not change geometry much to matter for alignment. That being said I myself just recently discovered that it turns out for proper alignment you need to have 150lbs weight on driver seat - otherwise your alignment will be off
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      03-06-2017, 09:09 AM   #3
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Spacers have no affect on alignment.
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      03-06-2017, 11:57 AM   #4
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Will affect scrub radius so it will made difference how the car handles and could introduce inside tire wear.
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      03-06-2017, 12:18 PM   #5
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It will change it a tiny amount, as the reading will be taken further from the adjustment points, but then different equipment will read different distances from the hub face anyway, so it's nothing to actually worry about. In theory the further from the hub face the measurement is taken the more accurate it will be.
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      03-06-2017, 01:41 PM   #6
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Guys can I just skip 150lbs on driver seat requirements for proper alignment - it's hard to find a shop that has weights for that (I can try stealership, but not sure what they charge for alignment). How much affect will that have, is it something must do or I can skip it?
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      03-06-2017, 02:18 PM   #7
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Quote:
Originally Posted by n55jb4 View Post
Guys can I just skip 150lbs on driver seat requirements for proper alignment - it's hard to find a shop that has weights for that (I can try stealership, but not sure what they charge for alignment). How much affect will that have, is it something must do or I can skip it?
Any independant shop that specializes in BMWs should be able to do it. A BMW dealer would charge $150 for 4 wheel align.
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      03-06-2017, 02:19 PM   #8
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Originally Posted by Digitalize View Post
It will change it a tiny amount, as the reading will be taken further from the adjustment points, but then different equipment will read different distances from the hub face anyway, so it's nothing to actually worry about. In theory the further from the hub face the measurement is taken the more accurate it will be.
thanks!!
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      03-06-2017, 03:18 PM   #9
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Quote:
Originally Posted by n55jb4 View Post
Guys can I just skip 150lbs on driver seat requirements for proper alignment - it's hard to find a shop that has weights for that (I can try stealership, but not sure what they charge for alignment). How much affect will that have, is it something must do or I can skip it?
Absolutely, you can skip the weights. It will only make a marginal difference anyway if you primarily drive solo.

In reality, EVERY car should be aligned with weights. The suspension obviously compresses under load. This changes alignment. That's why you want to align the car AFTER your typical cargo has already compressed the suspension a bit. This is accomplished with the weights, and BMW usually places weight in 4 seats to simulate a full car. Someone who drives alone would probably want to only put a weight on the driver seat... Or a weight in the passenger seat too to simulate an instructor (HPDE).

There is no difference to aligning a BMW than any other car... expect for the star bits and the alignment machine specifying the weights...
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      03-07-2017, 06:12 PM   #10
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A good alignment place should have some weights to simulate a rough driver weight but it's not always done and isn't the end of the world if it isn't.

I tend to try and aim for just above 1/2 a tank of fuel, and keeping anything I regularly keep in the car in there too.
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