Pass side LTFTs almost always leaner than drivers side
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On The Tree
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Joined: Dec 2002
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From: Sleepy Hollow, NY
Pass side LTFTs almost always leaner than drivers side Hello,
I have noticed that most of the time, LTFTs on the passenger side (bank2)
are higher in value than the driver's side (bank1), usually
by a few percent, say 2-4% during normal driving (not WOT).
How can this be? I am sure that the intake/gaskets are tight etc.
There is a small "looks like a pressure regulator" device on the fuel
rail which goes across the intake to the driver's side. COuld
that be the culprit? Or is it that the Passenger side just flows
more air than the driver's side?
Gert
I have noticed that most of the time, LTFTs on the passenger side (bank2)
are higher in value than the driver's side (bank1), usually
by a few percent, say 2-4% during normal driving (not WOT).
How can this be? I am sure that the intake/gaskets are tight etc.
There is a small "looks like a pressure regulator" device on the fuel
rail which goes across the intake to the driver's side. COuld
that be the culprit? Or is it that the Passenger side just flows
more air than the driver's side?
Gert
The manifolds & Y-pipe plumbing are slightly different,
so you have slightly different backpressure, cylinder
filling etc.; minor fuel flow differences become larger
at high flows as the passenger's rail is fed across
more tubing & through the pulse damper. No telling
if there is any intake-side airflow imbalance but it's
just the sum of a bunch of little differences. I don't
think I've ever seen them differ by more than 1-2%
though, on mine.
so you have slightly different backpressure, cylinder
filling etc.; minor fuel flow differences become larger
at high flows as the passenger's rail is fed across
more tubing & through the pulse damper. No telling
if there is any intake-side airflow imbalance but it's
just the sum of a bunch of little differences. I don't
think I've ever seen them differ by more than 1-2%
though, on mine.
