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Mike Edwards



Member Since: 13 Feb 2021
Location: Northampton
Posts: 51

United Kingdom 2010 Range Rover Vogue TDV8 Santorini Black
Sensible Air Flow Sensor Readings

Plugged my IID Tool in to a friend’s L405 today.

Was expecting the air flow readings to be the same for each bank.

Should they be the same and, if so, what would a normal reading at idle be?

Click image to enlarge

Post #593157 4th May 2021 6:54pm
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Mike Edwards



Member Since: 13 Feb 2021
Location: Northampton
Posts: 51

United Kingdom 2010 Range Rover Vogue TDV8 Santorini Black

Am I to assume that absolutely nobody has ever hooked up an IID unit to their diesel L405 and looked at the MAF numbers?

Post #593780 10th May 2021 3:01pm
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stan
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United Kingdom 2016 Range Rover Vogue TDV6 Indus Silver

i looked in the WM [link in the wiki] and found this..apparently only one MAF sensor gives output which would account for your readings ???,



 ... - .- -.


click for,

WIKI

HOW TO Ǝꓕ∀ꓕOꓤ PICS




.

Post #593781 10th May 2021 3:18pm
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Mike Edwards



Member Since: 13 Feb 2021
Location: Northampton
Posts: 51

United Kingdom 2010 Range Rover Vogue TDV8 Santorini Black

I read that to be temperature from one but air flow reading from both.

If not, why would you bother fitting a second unit?

Post #593848 11th May 2021 7:54am
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stan
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Member Since: 13 Jul 2010
Location: a moderate moderated moderator moderating moderately in moderation
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United Kingdom 2016 Range Rover Vogue TDV6 Indus Silver

dont know but theres a lot more to read in the WM...my pic is just a small extract from it.. ... - .- -.


click for,

WIKI

HOW TO Ǝꓕ∀ꓕOꓤ PICS




.

Post #593851 11th May 2021 8:49am
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Mike Edwards



Member Since: 13 Feb 2021
Location: Northampton
Posts: 51

United Kingdom 2010 Range Rover Vogue TDV8 Santorini Black

Finally worked out why I was getting confusing numbers from the different MAF sensors.

It is a sequential turbo as we know, the confusion stemmed from why at idle it was showing such very different readings.

It appears that once it is warmed up there is no air through the second turbo until the revs get to around 3k rpm.

What I was seeing, and what was confusing, is why there is a small amount of air passing through at idle.

It turns out that when cold the second turbo does do very small amount of work, I can only assume to get things warmed up a little quicker.

NO idea why but will keep investigating if anyone is interested.

Post #595573 27th May 2021 10:21pm
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jumpin mouse



Member Since: 28 Feb 2016
Location: North West
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United Kingdom 2015 Range Rover Autobiography SDV8 Aruba

I'm interested Mike, I like to keep learning.

Thanks.

Post #595592 28th May 2021 7:47am
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