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MCU's lengthen time to air up...
05-05-2010, 06:35 AM
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#1
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Senior Member
Winnebago Owners Club
Join Date: Oct 2009
Posts: 1,169
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Ever since I put the motion control units on, it takes much longer to air up before the coach is ready to roll. Sometimes 10 minutes. Is this what others have experienced? Joe
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2008 Itasca Latitude 39W. Cummins ISB 6.7 Turbo 340HP. Allison 6 Speed. Freightliner XCS. Michelin XRV 255/80R 22.5 LRG. SuperSteer MCU. Safe-T-Plus.
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05-05-2010, 07:49 AM
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#2
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Senior Member
Join Date: Mar 2002
Location: Western WA
Posts: 481
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I have not noticed any significant delay airing up the suspension on ours.
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'07 Winnebago Journey 34H,
Toad - "08 Ford Taurus X
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05-05-2010, 08:43 AM
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#3
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Senior Member
Join Date: May 2006
Location: Central Florida
Posts: 620
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No difference on airing up on my coach either. It is a bit slower airing down but not significantly so.
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Harry
2005 Itasca Horizon 40KD
2006 Honda CR-V
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05-07-2010, 07:37 AM
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#4
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Senior Member
Join Date: Aug 2004
Posts: 709
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If you have a smart wheel you can raise the idle up by turning on the cruise control. The higher rpm will fill the tanks quicker.
Jim
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2007 Winnebago Vectra 40TD, 2004 Dodge Dakota
Our Photos
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05-07-2010, 10:19 AM
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#5
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Feb 2008
Location: Pensacola, Florida
Posts: 3,549
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I've had my MCUs on for three years and have not noticed any delay in dumping the air or airing back up. Might check and make sure that they are tight and that you don't have a leak.
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Travel well, travel safe,
Jim & BJ
2006 Tiffin Phaeton-2009 GMC Sierra CC 4X4
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05-08-2010, 05:31 PM
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#6
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Senior Member
Freightliner Owners Club Fleetwood Owners Club
Join Date: Nov 2001
Location: Southern California
Posts: 1,105
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It takes me about 30 seconds longer to deflate my air bags since my MCU install, but inflation time is the same. Sounds like an air line obstruction of some sort. 10 minutes is an awfully long time.
Craig
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2005 Fleetwood Providence 39J CAT C7 350, MP-8 Programmer
My wife does all the driving - I just hold the wheel...
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05-10-2010, 08:15 PM
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#7
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Junior Member
Winnebago Owners Club
Join Date: Apr 2010
Posts: 10
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Just had MCU installed on mine, it is not any slower or faster than it was before. Maybe your dump valve is having some sort of malfuntion?
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05-11-2010, 06:58 PM
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#8
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Senior Member
Join Date: Aug 2004
Posts: 709
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For those of you that say there is no difference, did you actually time the inflation/deflation before and after the MCU's were installed? Mine gained about 3.5 minutes on both cycles.
Jim
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2007 Winnebago Vectra 40TD, 2004 Dodge Dakota
Our Photos
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05-12-2010, 04:56 PM
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#9
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Senior Member
Join Date: Jan 2004
Location: Albuquerque, NM
Posts: 600
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Hi azloafer (as in the shoe I hope),
I absolutely love the MCUs that I installed about a year ago. The handling was great to start with, and it’s improved 5 fold.
As to the time to inflate, I haven’t noticed any increase in up time but now that you mention it, there may be a slight increase in time. I use a fast idle of 900 to 1000 RPM as I’m ready to leave and this reduces the air up time considerably. I believe it’s about 3 to 4 minutes. It also helps with the electrical load placed on the system by the HWH dump valves.
The down time is increased just enough to be noticeable. It’s also made the dump procedure a lot less noisy. Our Journey really screeched when it was dumped to the point that I had to make silencers for the exhaust air from the dump valve. I’m sure that the MCU’s would have quieted the screech to a very reasonable sound level.
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Have Fun!! Mark & Donalda 04 Horizon 40WD no TOW 90,900+ miles and counting 
Triumph Bonneville & Susuki S40 on the back 
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05-13-2010, 08:48 PM
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#10
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Senior Member
Winnebago Owners Club Texas Boomers Club Freightliner Owners Club
Join Date: Jul 2006
Location: Port Aransas, TX
Posts: 704
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I haven't really noticed a difference, but I really wasn't paying attention before I got them.
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Michael
2008 Itasca Meridian, Cummins ISB 350, Allison 3000, Progressive EMS, Supersteer MCUs, Aventa II, Air Force One, Tire Safeguard TPMS, 15,000 BTU roof AC, Blue Ox Tru Center
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05-14-2010, 04:55 PM
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#11
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Community Moderator
Join Date: Jan 2007
Location: Litchfield Park, Arizona
Posts: 5,162
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I've had mine for >2yrs and haven't noticed any difference... but never measured it. I'm sure it's not close to 10min.
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Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD
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05-16-2010, 09:02 PM
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#12
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Senior Member
Winnebago Owners Club
Join Date: Oct 2009
Posts: 1,169
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I don't know what happened but the coach airs up in about 3 minutes now. Must have just been a glitch in the system because it is fine now. Thanks for the replies, Joe
__________________
2008 Itasca Latitude 39W. Cummins ISB 6.7 Turbo 340HP. Allison 6 Speed. Freightliner XCS. Michelin XRV 255/80R 22.5 LRG. SuperSteer MCU. Safe-T-Plus.
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