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#4558547 - 10/29/17 04:39 PM Stock gm air filter gauge
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
I picked up a lid for the wifes 04 tahoe that has the restriction gauge built in. It has a 50% and an 80% on the gauge. Any ideas how that translates to actual restriction?
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#4558570 - 10/29/17 05:15 PM Re: Stock gm air filter gauge [Re: Chris142]
compratio10_5 Offline


Registered: 12/07/15
Posts: 83
Loc: Pocatello, Idaho
According to an Oak Ridge National Laboratory study entitled "Effect of Intake Air Filter Condition on Vehicle Fuel Economy" Conducted in 2009, a similar factory OEM indicator taken from a 2001 Chevrolet Silverado with 5.3L V-8, measured 5.7 kPa (23 " H2O) at the level that the indicator entered the red zone. I suppose that the percentages apply to the full scale reading. They found no effect on fuel economy with computer controlled engines from air filter restriction but some power loss at full open throttle with high restriction. Since air filter efficiency improves with restriction, a reasonable air filter change point might be at the 80% level unless you are into drag racing this vehicle.
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#4558668 - 10/29/17 07:01 PM Re: Stock gm air filter gauge [Re: Chris142]
Warstud Online   content


Registered: 09/02/05
Posts: 5390
Loc: MIchigan
As the filter becomes clogged and becomes restrictive the spring becomes less visible. Is it color coded?

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#4558756 - 10/29/17 08:35 PM Re: Stock gm air filter gauge [Re: Chris142]
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
Not drag racing but she does lots of trips up and down cajon pass. Needs all the power it has.
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02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
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#4558757 - 10/29/17 08:35 PM Re: Stock gm air filter gauge [Re: Warstud]
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
Originally Posted By: Warstud
As the filter becomes clogged and becomes restrictive the spring becomes less visible. Is it color coded?
no color code till the bottom. Its red.
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4558795 - 10/29/17 09:04 PM Re: Stock gm air filter gauge [Re: Chris142]
Warstud Online   content


Registered: 09/02/05
Posts: 5390
Loc: MIchigan
Originally Posted By: Chris142
Originally Posted By: Warstud
As the filter becomes clogged and becomes restrictive the spring becomes less visible. Is it color coded?
no color code till the bottom. Its red.


Red means it's time for a new filter.

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#4558835 - 10/29/17 09:46 PM Re: Stock gm air filter gauge [Re: compratio10_5]
jj51702 Offline


Registered: 10/07/16
Posts: 232
Loc: California
Originally Posted By: compratio10_5
According to an Oak Ridge National Laboratory study entitled "Effect of Intake Air Filter Condition on Vehicle Fuel Economy" Conducted in 2009, a similar factory OEM indicator taken from a 2001 Chevrolet Silverado with 5.3L V-8, measured 5.7 kPa (23 " H2O) at the level that the indicator entered the red zone. I suppose that the percentages apply to the full scale reading. They found no effect on fuel economy with computer controlled engines from air filter restriction but some power loss at full open throttle with high restriction. Since air filter efficiency improves with restriction, a reasonable air filter change point might be at the 80% level unless you are into drag racing this vehicle.


Excellent post. Need more members like u plz


Edited by jj51702 (10/29/17 09:47 PM)

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#4558848 - 10/29/17 10:03 PM Re: Stock gm air filter gauge [Re: Chris142]
Ducked Offline


Registered: 10/25/12
Posts: 4334
Loc: Taiwan
IIRC that Oak Ridge study (available online last week) gives 10 inches of water (in excess of the negative pressure generated by a new filter) as a reasonable rule-of-thumb restriction for a filter change.

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#4558858 - 10/29/17 10:43 PM Re: Stock gm air filter gauge [Re: Ducked]
compratio10_5 Offline


Registered: 12/07/15
Posts: 83
Loc: Pocatello, Idaho
Yes, the study does recommend 10 " H2O above the clean filter restriction as a "rule of thumb" air filter change point, but on a factory installed gauge I believe that the manufacturer selects the red zone as the normal filter replacement point. In any case, if the drop in power is objectionable just change the filter earlier at 50% for example. In most situations, if you are not often driving on dirt roads, the air filter will last far longer than you expect. Installing these filter minder gauges is one of the best things that General Motors has done on its trucks. This saves the owners money on filters and extends engine life. A rare win-win situation.
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It's not what you don't know that hurts, it's what you think you know that ain't so. Will Rogers

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#4558995 - 10/30/17 07:16 AM Re: Stock gm air filter gauge [Re: Chris142]
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
We live on dirt roads. Plus the wind always blows and we get dust storms almost every day. I bought a wix HD air filter for it.
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4558998 - 10/30/17 07:18 AM Re: Stock gm air filter gauge [Re: Chris142]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
You would think with the push on fuel economy today and CAFE, that air filter indicators would be standard equipment today on most vehicles. ?!? shrug


Edited by StevieC (10/30/17 07:18 AM)
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#4559341 - 10/30/17 02:42 PM Re: Stock gm air filter gauge [Re: StevieC]
Malo83 Offline


Registered: 08/08/08
Posts: 2000
Loc: Cali
Just change it out annualy and you will sleep better. cheers

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#4559656 - 10/30/17 08:19 PM Re: Stock gm air filter gauge [Re: StevieC]
CR94 Offline


Registered: 03/20/16
Posts: 1120
Loc: Western S.C. since 1996
Originally Posted By: StevieC
You would think with the push on fuel economy today and CAFE, that air filter indicators would be standard equipment today on most vehicles. ?!?
No, I wouldn't think that, because replacing the air filter doesn't help fuel economy in most vehicles---as already explained in this thread and many others. It may help in vehicles too old to have self-adjusting fuel mixture control. Even in those, the restriction has to be pretty bad to make much difference in normal driving.
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#4559674 - 10/30/17 08:40 PM Re: Stock gm air filter gauge [Re: Chris142]
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
I wonder why some trucks get them and others dont? Ours never had one. I bet 90% of the chevy trucks I get at work do have them.
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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