Best/Accurate 85-90 MAF sensors?
09-17-2011, 06:34 PM
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Best/Accurate 85-90 MAF sensors? What is the best, most accurate reading maf sensor out there? I heard the 85mm slp wasn't all that great.... Anybody know who makes a good 85-90mm maf?
09-17-2011, 10:07 PM
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I was once told by someone who did airflow calibration for a living that
the Delphi MAFs are better than 5% group tolerance. That's pretty
accurate in my book. But you can see differences on that order between
models & years in the MAF tables for vehicles that use the same Delphi
piece. This is the issue - accurate according to what? GM has an idea
and they spent some time on the numbers you can bet. SLP solders in
a 5% Radio Shack grade resistor and doesn't tell you Jack about the
result. It's on you to calibrate the thing and you don't have the setup
to do it, I can pretty much guarantee - maybe a dozen or so cal labs
nationwide do.
People who "calibrate" their own MAF table are embedding non-MAF,
non-airflow errors into that calibration, unaware. It's unavoidable
except by truing up every other fuel-side and AFR measurement
error, of which there are many, first. Who does that? Nobody.
Close enough is the best you can do. Picking a piece with a known
calibration is a whole lot easier. Stock Delphi is hard to beat for that,
or for price.
the Delphi MAFs are better than 5% group tolerance. That's pretty
accurate in my book. But you can see differences on that order between
models & years in the MAF tables for vehicles that use the same Delphi
piece. This is the issue - accurate according to what? GM has an idea
and they spent some time on the numbers you can bet. SLP solders in
a 5% Radio Shack grade resistor and doesn't tell you Jack about the
result. It's on you to calibrate the thing and you don't have the setup
to do it, I can pretty much guarantee - maybe a dozen or so cal labs
nationwide do.
People who "calibrate" their own MAF table are embedding non-MAF,
non-airflow errors into that calibration, unaware. It's unavoidable
except by truing up every other fuel-side and AFR measurement
error, of which there are many, first. Who does that? Nobody.
Close enough is the best you can do. Picking a piece with a known
calibration is a whole lot easier. Stock Delphi is hard to beat for that,
or for price.
09-18-2011, 12:56 AM
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so your saying the stock one is best? I am thinking the stock one is good, but I kinda want to get an 85 or 90mm cuz I have the 90/90 intake and you would think going from smaller to bigger is a little silly isn't it?
09-18-2011, 01:30 AM
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Z06 MAF (descreened Delphi 85mm) and Z06 table would be a reasonable
start. You might find bigger ones where the manufacturer actually tells
you what the hell the calibration is. That would not include SLP or
Granatelli.
start. You might find bigger ones where the manufacturer actually tells
you what the hell the calibration is. That would not include SLP or
Granatelli.
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09-18-2011, 10:07 PM
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Plot from a small collection of MAF curves I had pulled together some
years back. The Holden Monaro uses the same MAF as the F-bodies
and doesn't have as jacked a curve at the top end. All the 85mm
Delphi curves are pretty close, I like the Z06 after heads & cam but
the truck was closer to right, before those mods.
years back. The Holden Monaro uses the same MAF as the F-bodies
and doesn't have as jacked a curve at the top end. All the 85mm
Delphi curves are pretty close, I like the Z06 after heads & cam but
the truck was closer to right, before those mods.
Last edited by jimmyblue; 09-18-2011 at 10:16 PM.
