at a crossroad with my MAF
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Joined: Dec 2001
Posts: 563
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From: Macomb, MI
Re: at a crossroad with my MAF Why do you think the ported ends from thunder would be better? Did you tune with the SLP 85 installed? I'm thinking about adding the SLP 85 and a ported TB.
<small>[ March 06, 2003, 08:45 AM: Message edited by: HOSS99 ]</small>
<small>[ March 06, 2003, 08:45 AM: Message edited by: HOSS99 ]</small>
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Joined: Aug 2002
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From: TN
Re: at a crossroad with my MAF That is just it, I am on factory tuning for a while longer. I am getting a cam installed soon, and an LS6 intake so that is when i will get it tuned. So I don't wether the ls6 is helping or hurting at this point.
Re: at a crossroad with my MAF Why would you want to mess around with MAF ends?
Just to make more work for yourself?
If you have the SLP 85mm that's calibrated for
your model year group, it should have you set
right. Mine was indistinguishable from the
stock MAF in terms of idle and driving
behavior, with -5ish LTtims.
<small>[ March 06, 2003, 02:17 PM: Message edited by: WILWAXU ]</small>
Just to make more work for yourself?
If you have the SLP 85mm that's calibrated for
your model year group, it should have you set
right. Mine was indistinguishable from the
stock MAF in terms of idle and driving
behavior, with -5ish LTtims.
<small>[ March 06, 2003, 02:17 PM: Message edited by: WILWAXU ]</small>
TECH Enthusiast
Joined: Dec 2001
Posts: 563
Likes: 0
From: Macomb, MI
Re: at a crossroad with my MAF </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jimmyblue:
<strong> Why would you want to mess around with MAF ends?
Just to make more work for yourself?
If you have the SLP 85mm that's calibrated for
your model year group, it should have you set
right. Mine was indistinguishable from the
stock MAF in terms of idle and driving
behavior, with -5ish LTtims. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Jimmy,
What we are trying to get at is: When the car is tuned, will it be more beneficial to have the SLP 85mm or the MAF Ends. Does it make any differnce? I can tell you have very a strong opinion about this subject. Please educate us.
<small>[ March 06, 2003, 02:29 PM: Message edited by: HOSS99 ]</small>
<strong> Why would you want to mess around with MAF ends?
Just to make more work for yourself?
If you have the SLP 85mm that's calibrated for
your model year group, it should have you set
right. Mine was indistinguishable from the
stock MAF in terms of idle and driving
behavior, with -5ish LTtims. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Jimmy,
What we are trying to get at is: When the car is tuned, will it be more beneficial to have the SLP 85mm or the MAF Ends. Does it make any differnce? I can tell you have very a strong opinion about this subject. Please educate us.
<small>[ March 06, 2003, 02:29 PM: Message edited by: HOSS99 ]</small>
Re: at a crossroad with my MAF I see a lot of people reporting problems that
trace back to MAF ends. You make a mixture
error that has to be taken out. Because the
screen isn't there to balance airflow across
the MAF frontal area, you get nonlinear
response to airflow; air may be evenly
presented at low velocity, unevenly biased
by intake tract bends and airflow inertia
at high velocity. The thermal MAF sensing
depends on the assumption that airflow is
distributed evenly, as the circuitry was
designed for and cal'd originally.
You can up area by using an 85mm MAF and keep
the screen, or you can go big and screenless,
in either case the 85mm MAF choke area is larger
than MAF ends will give you because the center
plastic piece on the stock MAF is only 80mm ID.
Why go with half measures when they cost you
extra effort just to get working right? I mean,
for what people sell MAF ends for, you can pick
up a used 85mm SLP. What I don't get is the
huge prices for other aftermarket ones. Nutso.
Somebody ought to flow-bench some variations
and see what the real difference is at low
pressure drops (like 3" H2O / 0.1PSI). Then
the airflow end of it would be scientific
instead of hoopla and wishful thinking, leaving
only the mixture error (for better or worse).
If the MAF flows more than the engine draws,
at 0.1PSI drop, then it isn't worth replacing.
But I've yet to see any such data, only tales
of woe for the most part, brought on by vendor
hype and the lure of the cheap fix.
trace back to MAF ends. You make a mixture
error that has to be taken out. Because the
screen isn't there to balance airflow across
the MAF frontal area, you get nonlinear
response to airflow; air may be evenly
presented at low velocity, unevenly biased
by intake tract bends and airflow inertia
at high velocity. The thermal MAF sensing
depends on the assumption that airflow is
distributed evenly, as the circuitry was
designed for and cal'd originally.
You can up area by using an 85mm MAF and keep
the screen, or you can go big and screenless,
in either case the 85mm MAF choke area is larger
than MAF ends will give you because the center
plastic piece on the stock MAF is only 80mm ID.
Why go with half measures when they cost you
extra effort just to get working right? I mean,
for what people sell MAF ends for, you can pick
up a used 85mm SLP. What I don't get is the
huge prices for other aftermarket ones. Nutso.
Somebody ought to flow-bench some variations
and see what the real difference is at low
pressure drops (like 3" H2O / 0.1PSI). Then
the airflow end of it would be scientific
instead of hoopla and wishful thinking, leaving
only the mixture error (for better or worse).
If the MAF flows more than the engine draws,
at 0.1PSI drop, then it isn't worth replacing.
But I've yet to see any such data, only tales
of woe for the most part, brought on by vendor
hype and the lure of the cheap fix.
