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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Jun-22-2012, 03:52:54 AM   #1
nis350
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Default Effect of rear toe setting

I read that the incorrect front toe setting would cause the car not tracking straight, off center steering wheel & pulling to one side etc...

Assuming all other settings are within spec., what would be the impact of out of spec toe setting on the rear? Does it have the similar effect as the front toe?

I do realize that both would cause abnormal tire wears which would take some miles.

Thx.
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Old Fri, Jun-22-2012, 04:18:24 AM   #2
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Default Re: Effect of rear toe setting

I'm no expert on rear tow, but in a word, no, not the same effects as front.
Can't remember all the directions/extreme combos, but the effects - and this assumes it is a setting, not something bent - are better behavior in turns, vs being jittery/unstable at high speed.
Since there is no steering in rear, there are less joints, so you tend to have less one-sided wear trouble, or tracking troubles - again assuming nothing is bent. You can scrub cyclic patterns in the tread like on the front if really bad, but you just don't see much of this unless something is bent. More frequently, rear tire wear problems, even if totally even across the tread, are due to RTAB wear. There are other bushings, but RTABs are often shot at about 50k miles or more.

Others can give you better detail on the rear toe effects, but if you're having a problem, the starting assumption is almost always either RTABs, or something is bent (wear on one side or alignment won't come into spec). Don't waste money on an alignment until you are certain the bushings are ok.

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Last edited by RedM3/4; Fri, Jun-22-2012 at 04:19:22 AM. Reason: clarity
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Old Fri, Jun-22-2012, 04:50:21 AM   #3
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Default Re: Effect of rear toe setting

incorrect rear toe will chew them tires off alot faster than you think if set wrong. why are you asking anyway? are u having problems with tire wear or car skidding and hopping. Does the car feel un-stable at high speeds. If you are un-sure on what exactly to look for, take it to a good Indy shop that has good techs and ask for a complete suspension inspection front and rear. They should be able to tell you what is wrong, anything broken or worn out, future maitenece... getting an alignment with out having done a proper inspection and fixing any worn out items is tossing ur money out the window. You have any pics of your tires if they are wearing un-even?
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Old Fri, Jun-22-2012, 01:00:54 PM   #4
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Default Re: Effect of rear toe setting

Basicly the more negative toe at the rear, the harder the car will oversteer, but when it does it will be very fast and hard
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Old Fri, Jun-22-2012, 02:02:31 PM   #5
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Default Re: Effect of rear toe setting

Actually incorrect rear toe can also affect pulling to one side, etc. If both rear tires are toed in the same direction (one toed in and one toed out / /) the car will definitely not go straight.
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Old Fri, Jun-22-2012, 05:16:08 PM   #6
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Default Re: Effect of rear toe setting

Quote:
Originally Posted by tony(topaz,SMG) View Post
Actually incorrect rear toe can also affect pulling to one side, etc. If both rear tires are toed in the same direction (one toed in and one toed out / /) the car will definitely not go straight.
what if one side is out of spec with more toe in than the other? would the car still track straight at fwy speed?

Common sense tells me that it wouldn't and possibly cause the steering wheel to be off center due to compensation of one rear side pushes more than the other to one direction. Just guessing.
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Old Fri, Jun-22-2012, 05:35:52 PM   #7
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Default Re: Effect of rear toe setting

Insufficient rear toe in will cause some fun handling issues (think massive oversteer as you get on the gas coming out of corners).

You can get "dog tracking" when the rear toe is set wrong, but it has to be pretty far out.

The tire wear comments above are correct.

One side being different than the other is tough to detect if the difference is minimal.

Lowering the rear of the car will cause the rear to toe out.
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Old Fri, Jun-22-2012, 08:43:19 PM   #8
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Default Re: Effect of rear toe setting

Rear tow cannot cause the steering wheel to be off center - at rest - which is how things are set. As mentioned, you could end up needing to correct steering and holdthe wheel off center to go straight if it were extreme on one side. If one were +, other - to a major extreme, you really couldn't even correct this with the wheel, you would drift out of the lane no matter what you did, but these are something is bent extremes IMO.
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Quote:
Originally Posted by nis350 View Post
what if one side is out of spec with more toe in than the other? would the car still track straight at fwy speed?

Common sense tells me that it wouldn't and possibly cause the steering wheel to be off center due to compensation of one rear side pushes more than the other to one direction. Just guessing.
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06 SMG/ZCP - April 09, MCS 2WR (replaced Dinan over Konis/replaced OE), Supersrpint street section3, RAC RG63, homelink with off-delay, multifunction steering wheel buttons, RacingBrake Front kit.
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Discussing Effect of rear toe setting in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)