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Old 09-07-2011, 09:39 PM   #1
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Air Filter Restriction Indicator

I purchased a 2002 Winnebago 40 J Ultimate Advantage, 350 HP Cummins with a Banks turbo kit, a couple months ago.

The Air Filter Restiction Indicator shows the filter needs replacing after reseting and driving a few mile with a new filter.

I suspect the indicator needs replacing, but wonder if the Banks turbo could be part of the issue. Do I need to concider the banks turbo when replacing the indicator?

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Old 09-07-2011, 11:09 PM   #2
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Sort of the same thing ours does. We also have the Banks Power Pack on a 350 Cummins. New filter shows about 15 after the install.Much lower before.
The Banks Power Pack kit includes a new turbo housing and increases the air flow so the gauge shows more restriction.
If it's too high you may need to open up the intake setup with a larger filter and tubing, but that still leaves the CAC and it may be too small for the change.
However the gauge is cheap so it wouldn't hurt too much to try it just to be sure.

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Old 09-08-2011, 07:19 AM   #3
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We have the ISC-330 with the full Banks kit and factory filter. The filter restriction guage is still at minimum after new filter and 15,000 miles.
Hal & Ginny Miller '04 Beaver Santiam PRT40
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Old 09-09-2011, 09:25 AM   #4
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If you are showing that much vacuum in the air intake, I would say you have a problem. If not the filter, something else in the intake plumbing. How is the perfromance? Mine begins to fall off when the filter minder gets to around 50%.

A diesel is extremely dependent on a large air flow. If a new filter minder gives the same reading, you need to think seriously about enlarging the air intake and filter size. By the way, make sure it is the right filter. Maybe a previous owner stuck in a non-standard one that is simply too restrictive.
Gary Brinck
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Old 09-09-2011, 10:02 AM   #5
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Even a brand new filter will jump your indicator to 11"s. Start with the least and easiest thing to replace i.e. your indicator. Pull it off and draw a vacuum on the end. That is what Mike Cody teaches in Camp Freightliner.
Tom, Cheryl & Blossom(coonhound mix) Formerly of Bellingham,WA'05 Winnebago Journey 36G. FL-XC, Cat 350, aero muffler, AFE filter, 4 FSD Koni's, ultra track bell, SafeT+, FMCA397030, WIT 129107
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Old 09-10-2011, 08:27 AM   #6
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I don't have an answer to the problem, however I can tell you for a fact, about 25% of the DP's came from the factory with the indicators maxed out.

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