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 > first report new springs with a surprize result

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pianotuna

Regina, SK, Canada

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Posted: 11/15/19 07:33pm Link  |  Quote  |  Print  |  Notify Moderator

Hi,

I replaced the springs and had a leaf added on each side.

There were air bags that may have been improperly installed from the get go--7 inch bags in a 5 inch space, so the brackets torn away from the frame.

The air bags have been replaced with timbrens, which do not touch the frame--but might if I had full water tanks (66 gallons).


I put on new monro shocks at the rear.

Results (big surprize).

The RV rides 2.5 inches higher at the rear.

Ride is improved

And now the shock. It appears from early results that gas mileage has gone up by about 1.5 to 2 mpg. I've asked one mechanic and he is totally puzzled.

Anyone care to offer an explanation?


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Terryallan

Foothills NC

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Posted: 11/15/19 08:09pm Link  |  Quote  |  Print  |  Notify Moderator

Could raising the rear have lowered the front, OR changed the angle of the wind over the front? would be my wild guess.


Terry & Shay
Coachman Apex 288BH.
2013 F150 XLT Off Road
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MrWizard

Traveling

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Posted: 11/16/19 01:54am Link  |  Quote  |  Print  |  Notify Moderator

Weigh the axles/ wheel weight
And compare to previous
I think the center of gravity has moved
Putting more weigh forward and less on the rear drive wheels


Radiate The Happy
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jjrbus

FT Myers FL

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Posted: 11/16/19 04:30am Link  |  Quote  |  Print  |  Notify Moderator

NOt a mechanic but have spent a lot of time on the forums over the years. One thing that is common and often reported is noticeable mpg improvement after wheel alignment. Did the bad springs contribute to poor alignment? But 1.5-2 that is a 20% improvement for most, far beyond anything I have heard. Start with checking your math LOL

pianotuna

Regina, SK, Canada

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Posted: 11/16/19 06:34am Link  |  Quote  |  Print  |  Notify Moderator

The wheels had been aligned less than 1000 miles ago.

Chris Bryant

Arden, North Carolina

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Posted: 11/16/19 07:14am Link  |  Quote  |  Print  |  Notify Moderator

You were going uphill before [emoticon]
Seriously, I would bet aerodynamics relating to the underside of the coach.


-- Chris Bryant

pianotuna

Regina, SK, Canada

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Posted: 11/16/19 08:42am Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the replies so far. I'll know in about 2 weeks if the bump up in mileages was a wind effect--because by then I'll have about 2700 miles and several fuel fill ups.

theoldwizard1

SE MI

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Posted: 11/16/19 03:05pm Link  |  Quote  |  Print  |  Notify Moderator

My E150 started sagging at about 5-7 years, especially when I hooked up my pop up to it (NO WDH). Added a leaf, What a difference ! It does sit a bit high when empty, but I would rather have that.

JaxDad

Greater Toronto Area

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Posted: 11/16/19 05:28pm Link  |  Quote  |  Print  |  Notify Moderator

As a pilot with a degree in aerospace engineering I can tell you that “parasitic losses” can manifest themselves in many weird and wonderful ways. Likewise the gains created by eliminating them, witness the little air tabs (originally designed for aircraft) that can measurably increase fuel mileage on a coach.

In this case, I’d say an overloaded suspension created excessive (even if you weren’t aware of it, the slow creep is imperceptible) motion which created the losses you’re now recouping.

time2roll

Southern California

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Posted: 11/16/19 07:45pm Link  |  Quote  |  Print  |  Notify Moderator

Just take it and don't look back. Sometimes you wonder why you waited so long.


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
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