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Wheel Alignment For Best MPG

alignment MPG tire wear

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13 replies to this topic

#1 OFFLINE   SnowStorm

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Posted 17 May 2015 - 10:47 PM

"The Enterprise" needs wheel alignment (inside edge wear).  Does anyone have the alignment specifications - preferred values and allowed ranges for each parameter both front and rear?  What values would give the lowest rolling resistance?  Have read that the allowed ranges are not just a "tolerance" but there to allow adjustment for preferred handling characteristics.  Would like to have the details before going to the shop.

 

(One F150 owner noted 2 mpg increase after alignment and an Escape owner claimed 4 mpg!  Extrapolating to the C-Max should give, maybe, 6 mpg! happy%20feet.gif )


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#2 OFFLINE   ls973800

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Posted 18 May 2015 - 07:52 AM


Didn't copy to here, see the next reply by me.
 


Edited by ls973800, 18 May 2015 - 08:10 AM.


#3 OFFLINE   ls973800

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Posted 18 May 2015 - 08:09 AM

Copied from my Ford DVD Service Manual.  Specs shown are for 2013-2014 C-Max Hybrid and C-Max Energi

 

Attached File  20150518_090042.jpg   67.91KB   7 downloads


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#4 OFFLINE   ptjones

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Posted 18 May 2015 - 08:24 AM

"The Enterprise" needs wheel alignment (inside edge wear).  Does anyone have the alignment specifications - preferred values and allowed ranges for each parameter both front and rear?  What values would give the lowest rolling resistance?  Have read that the allowed ranges are not just a "tolerance" but there to allow adjustment for preferred handling characteristics.  Would like to have the details before going to the shop.

 

(One F150 owner noted 2 mpg increase after alignment and an Escape owner claimed 4 mpg!  Extrapolating to the C-Max should give, maybe, 6 mpg! happy%20feet.gif )

No wonder we didn't get 47HWY, all FORD had to do is Align our cars, they would have saved a lot of money. LOL :lol2:

 

Paul


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#5 OFFLINE   Plus 3 Golfer

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Posted 18 May 2015 - 09:39 AM

My guess is that anything that causes the tire to "scrape" more will decrease FE - probably toe-in and then thrust angle more so than camber.  Note that the camber front RH and LH specs are not the same.  The specs are slightly biased for right hand driving roads.  

 

If you are serious about this and the garage is willing to do so, I'd try setting the front toe in to near 0* and the rear toe in such that the total toe in is minimal.  If there is an effect on FE, my guess is this would have the largest effect.  It will be interesting to see how the car tracks with virtually no toe in.  Maybe EPAS will compensate and keep the car going straight. :)  ;)


Edited by Plus 3 Golfer, 18 May 2015 - 09:42 AM.

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#6 OFFLINE   ptjones

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Posted 18 May 2015 - 09:49 AM

I know from experience rear camber can't be adjusted without replacing a upper arm suspension part. In my case I didn't notice any improvement in MPG's ;) 

 

Paul 



#7 OFFLINE   SnowStorm

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Posted 18 May 2015 - 11:47 AM

Copied from my Ford DVD Service Manual.  Specs shown are for 2013-2014 C-Max Hybrid and C-Max Energi

 

attachicon.gif20150518_090042.jpg

Thanks! Does anyone know what Toe "@ curb ride height" means? I'm guessing "ride heaight @ curb weight", that is, car empty. Hope to get it done this week and, assuning its out, get an idea this weekend about any improvement.

 

+3   I see the front Toe is already 0 and rear is quite small so maybe the standard settings are already optimized for mileage. One would think so.



#8 OFFLINE   Plus 3 Golfer

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Posted 18 May 2015 - 05:51 PM

Thanks! Does anyone know what Toe "@ curb ride height" means? I'm guessing "ride heaight @ curb weight", that is, car empty. Hope to get it done this week and, assuning its out, get an idea this weekend about any improvement.

 

+3   I see the front Toe is already 0 and rear is quite small so maybe the standard settings are already optimized for mileage. One would think so.

No, here's a better pic of the specs below.  The specs for front toe are between 0* and 0.2*.  So, the techs will likely shoot for around 0.1* toe each side.  What I'm saying is to have them shoot for 0*.  The total toe would be between 0* and 0.4*.  Same with the rear toe but for the rear total toe, the total toe should be between 0.18* and 0.58*.  So it's not possible to set each rear toe to the minimum of -0.01 and meet the total toe spec.

 

Since the vehicle is in essence unloaded when doing alignments, toe at ride height would be toe at curb weight.  But there may be owners that carry significant additional weight in their vehicle all the time.  So, that's probably why it says ride height and those owners should leave the additional weight in the car when doing alignments.  Also, if altering the ride height via suspension or perhaps taller tires, one probably needs to do a new alignment. 

 

gallery_167_32_27078.jpg


Edited by Plus 3 Golfer, 18 May 2015 - 06:59 PM.


#9 OFFLINE   Plus 3 Golfer

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Posted 18 May 2015 - 06:37 PM

XXX


Edited by Plus 3 Golfer, 18 May 2015 - 06:57 PM.


#10 OFFLINE   SnowStorm

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Posted 18 May 2015 - 07:38 PM

Well I jumped the gun - should have waited for your answer.  Shop had a 3:30 opening today so took it in.

Before | After values are given below (of course a lot of these can't be adjusted anyway):

 

Camber LF = -0.7 | -0.7  RF = -0.6 | -0.6 

Caster LF = 4.6 | 4.6  RF = 4.2 | 4.2

Toe LF = 1/16" | 1/16"  RF = -1/32" | 1/16"  Total Toe = 1/32" | 5/32"  Steer Ahead = 0.09* | 0.02*

(the RF Toe and Steer Ahead were flagged as out of spec)

 

Camber LR = -2.2* | -2.3*  RR = -1.8* | -1.9*

Toe LR = 3/32" | 3/32"  Toe RR = 1/16" | 3/32"  Total Toe = 5/32" | 3/16"  Thrust Angle = 0.05* | 0.01*

 

So it looks like I ended up with more toe in than before!  So much for +6 mpg!

Not sure yet how to convert inches to degrees (crazy system - what's wrong with degrees?)

 

The -2.2* rear camber is near the limit, flagged "yellow" on their system, but that's the one that needs a replacement control arm to correct (gives a fixed +1* correction).  Don't yet have a price but there's some suspicion that it might help the inside edge wear problem (if you call a bit of abnormal wear at 65k miles a problem).  Other option would be to reverse mount the tires half way through their life and re-balance - that costs $60 total.  Paul, how much was the new control arm and how far off was the alignment before replacement?

 

I guess I'll drive these settings for a bit and see.  Then maybe get it redone when new tires go on.  We normally have a total load of about 400 pounds, sometimes more, rarely less.

 

+3, are you saying it would be best to weight the car with a "normal" load and then get it done at 0 toe?  Thanks everyone.



#11 OFFLINE   Plus 3 Golfer

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Posted 19 May 2015 - 09:01 AM

I haven't seen inches used in alignments for a long time as specs in inches is affected by tire size.   The angular measurement for alignment is accurate not matter what the tire size.  Tire wear as it changes the diameter of the tire will affect the spec (albeit not much) of the alignment when using the "inches" measurement method.  Although I haven't worked through the math, the conversion from inches to angular is:  Total_Toe_angle = atan(Total_Toe_inches / Tire_Diameter).

 

I doubt a several hundred pound will affect the ride height much.  If one was always transporting around the limit of the C-Max, one might want to get the alignment done fully loaded.  I would also guess that if the alignment was near the middle of the spec ranges, the ride height would still be in spec.  But if one was going to shoot for the edges of the spec range (like 0* front total toe in), then when fully loaded one might not see the intended results.  Maybe we can find something "credible" on the net.



#12 OFFLINE   fbov

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Posted 19 May 2015 - 10:17 AM

A couple things...

 

Toe-in/out, when I was learning decades ago, was measured to the RIM, not the tire. This seems intuitively obvious when one realizes how easy it is to defect a tire sidewall by 1/32". Accurate measurements can only be taken between hard points. Assume a 8.5" radius when calculating the angle.

 

Statis toe-in must be >0 or you will drive with toe-out. The implied 0.1 degree toe-in is the nominal you should target unless you've replaced all your front bushings with urethane. If a car does not have static toe-in, you will have toe-out on the road, when all the suspension parts are loaded, all bushings deflected, and both front tires slightly behind their rest locations. .

 

Don't get me wrong, toe-out can be a lot of fun. It was a cheap autocross tricks (if you didn't drive far), as a car with toe-out wants to turn. The car is dynamically unstable, just what you want in competition, with trained, experienced drivers, and should avoid in day-to-day driving.

 

But I'm darn impressed with the rear specs; more like semi-trailing arms...

 

HAve fun,

Frank



#13 OFFLINE   SnowStorm

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Posted 19 May 2015 - 10:52 PM

There seem to be several options for the rear camber adjustment:

  1. Fixed length replacement arm with +1 degree change
  2. Adjustable arms (seems like the "proper" way to go)
  3. Replacement bolts with off-center bushing (use original arm but may have to cut off a welded on nut)

Any experience or thoughts on the adjustable options?

 

BTW, tried the "shade tree" camber measurement where you stand a level vertical next to the wheel and measure the distance to top/bottom edges of rim.  I got 3/4" difference on left & 5/8" on right with a rim diameter of 18.5" (at measurement point).  Now arcTan(0.75/18.5)=2.3 degrees (considered negative) and arcTan (0.625/18.5)=1.9 degrees.  Exact same numbers as alignment shop!


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#14 OFFLINE   SnowStorm

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Posted 03 August 2015 - 06:50 PM

Went with adjustable arms that were installed today and the wheels look so much better sitting up nice and straight.  Camber is now about -0.7 (right near the limit) instead of, like, 3 times that amount.  Bought the arms from Massive Speed System, made in USA, purple anodized aluminum (other colors available!) - a shame they're under the car where you can't see them!  BTW, web site may say they don't fit the C-Max but they do - they're on my car right now.  Go get your own set for just over $200.  (No, I have no association with Massive - just delighted to find stuff made in America.)

 

Now I just need to keep up with tire rotations!  No more "snow tires" in summer!


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