Throwing MAF Codes. Any suggestions on which one to buy?
Thread Starter
TECH Apprentice
Joined: Apr 2003
Posts: 310
Likes: 0
From: Raleigh, NC
Throwing MAF Codes. Any suggestions on which one to buy? This MAF I'm currently using is out of a 00 SS but It's been used a lot for juice before my most recent rebuild. It's occasionally throwing low voltage codes..
If I didn't have certain plans I would just buy another stock replacement.
However I'm planning on going with the LSX Intake Manifold and a LSX 90 MM throttle body.
SO I would like to use the best fitting and most appropriate MAF considering I'll FI and such.
I'm planning on having 600HP as a Daily Driver Turbo car.
I'd really like to order one today. I'm heavily considering the Z06 MAF for F Bodies or the SLP 85 MM maf. Are they good choices. I'd reeally appreciate any advice..
Also I just ordered HP Tuner software and it's on it's way. So Needing to retune shouldn't be that big of a deal.
If I didn't have certain plans I would just buy another stock replacement.
However I'm planning on going with the LSX Intake Manifold and a LSX 90 MM throttle body.
SO I would like to use the best fitting and most appropriate MAF considering I'll FI and such.
I'm planning on having 600HP as a Daily Driver Turbo car.
I'd really like to order one today. I'm heavily considering the Z06 MAF for F Bodies or the SLP 85 MM maf. Are they good choices. I'd reeally appreciate any advice..
Also I just ordered HP Tuner software and it's on it's way. So Needing to retune shouldn't be that big of a deal.
If it's only occasionally throwing a low frequency code, it
may just indicate that the MAF and the speed-density
airflow values are not agreeing very well (as might happen
with a lot of back-end mods and no tuning?).
You might be getting dropouts from a crappy / loose connector
too. Logging MAF frequency and looking for sudden dropouts
would highlight that, a quick pull & reseat of the connector
never hurt either.
I believe that the stock MAF, but descreened, is the
best choice for a FI car. Here's why - all of the "big MAFs"
from Delphi top out at 450g/sec or so, at 12KHz. The stock
F-body table quits early but in fact it's good to 512g/sec
at 12KHz (both of these being PCM code limits). You would
have to substitute the late model Holden MAF table to get
the proper high-end cal, and the '98s I believe have a lower
MAF frequency clip. At any rate, the stock MAF flows more
air -for the same frequency- than the other Delphi MAFs and
since frequency is a limit to sane readings, that matters. With
a turbo you can overcome the minor flow@pressure loss with
a bit more pressure (unlike NA where atmospheric, is all there
is).
If you substitute another stock MAF and still see low frequency
codes pop up, figure it's the speed-density side needing some
cleaning up.
Stay away from the Granatelli stuff. The Delphi MAFs, at least
have known good flow/frequency tables that you can tune with.
I would avoid the SLP unit, it's faked to look "close enough" to
the stocker but you're paying about an extra $79 for them to
solder on a resistor, and I am suspicious about the fidelity
across the airflow band, with that approach to "tuning". You
can get a kit with the adaptor harness, hose and stock Delphi
85mm for less (though tuning is then mandatory, while you
could half-*** along with the SLP unit for a while. Though the
early-years SLP version deliberately bends the reading lean
("improves performance", heh) which is just what you -don't-
want for a boosted motor.
may just indicate that the MAF and the speed-density
airflow values are not agreeing very well (as might happen
with a lot of back-end mods and no tuning?).
You might be getting dropouts from a crappy / loose connector
too. Logging MAF frequency and looking for sudden dropouts
would highlight that, a quick pull & reseat of the connector
never hurt either.
I believe that the stock MAF, but descreened, is the
best choice for a FI car. Here's why - all of the "big MAFs"
from Delphi top out at 450g/sec or so, at 12KHz. The stock
F-body table quits early but in fact it's good to 512g/sec
at 12KHz (both of these being PCM code limits). You would
have to substitute the late model Holden MAF table to get
the proper high-end cal, and the '98s I believe have a lower
MAF frequency clip. At any rate, the stock MAF flows more
air -for the same frequency- than the other Delphi MAFs and
since frequency is a limit to sane readings, that matters. With
a turbo you can overcome the minor flow@pressure loss with
a bit more pressure (unlike NA where atmospheric, is all there
is).
If you substitute another stock MAF and still see low frequency
codes pop up, figure it's the speed-density side needing some
cleaning up.
Stay away from the Granatelli stuff. The Delphi MAFs, at least
have known good flow/frequency tables that you can tune with.
I would avoid the SLP unit, it's faked to look "close enough" to
the stocker but you're paying about an extra $79 for them to
solder on a resistor, and I am suspicious about the fidelity
across the airflow band, with that approach to "tuning". You
can get a kit with the adaptor harness, hose and stock Delphi
85mm for less (though tuning is then mandatory, while you
could half-*** along with the SLP unit for a while. Though the
early-years SLP version deliberately bends the reading lean
("improves performance", heh) which is just what you -don't-
want for a boosted motor.
Thread Starter
TECH Apprentice
Joined: Apr 2003
Posts: 310
Likes: 0
From: Raleigh, NC
Originally Posted by jimmyblue
If it's only occasionally throwing a low frequency code, it
may just indicate that the MAF and the speed-density
airflow values are not agreeing very well (as might happen
with a lot of back-end mods and no tuning?).
You might be getting dropouts from a crappy / loose connector
too. Logging MAF frequency and looking for sudden dropouts
would highlight that, a quick pull & reseat of the connector
never hurt either.
I believe that the stock MAF, but descreened, is the
best choice for a FI car. Here's why - all of the "big MAFs"
from Delphi top out at 450g/sec or so, at 12KHz. The stock
F-body table quits early but in fact it's good to 512g/sec
at 12KHz (both of these being PCM code limits). You would
have to substitute the late model Holden MAF table to get
the proper high-end cal, and the '98s I believe have a lower
MAF frequency clip. At any rate, the stock MAF flows more
air -for the same frequency- than the other Delphi MAFs and
since frequency is a limit to sane readings, that matters. With
a turbo you can overcome the minor flow@pressure loss with
a bit more pressure (unlike NA where atmospheric, is all there
is).
If you substitute another stock MAF and still see low frequency
codes pop up, figure it's the speed-density side needing some
cleaning up.
Stay away from the Granatelli stuff. The Delphi MAFs, at least
have known good flow/frequency tables that you can tune with.
I would avoid the SLP unit, it's faked to look "close enough" to
the stocker but you're paying about an extra $79 for them to
solder on a resistor, and I am suspicious about the fidelity
across the airflow band, with that approach to "tuning". You
can get a kit with the adaptor harness, hose and stock Delphi
85mm for less (though tuning is then mandatory, while you
could half-*** along with the SLP unit for a while. Though the
early-years SLP version deliberately bends the reading lean
("improves performance", heh) which is just what you -don't-
want for a boosted motor.
may just indicate that the MAF and the speed-density
airflow values are not agreeing very well (as might happen
with a lot of back-end mods and no tuning?).
You might be getting dropouts from a crappy / loose connector
too. Logging MAF frequency and looking for sudden dropouts
would highlight that, a quick pull & reseat of the connector
never hurt either.
I believe that the stock MAF, but descreened, is the
best choice for a FI car. Here's why - all of the "big MAFs"
from Delphi top out at 450g/sec or so, at 12KHz. The stock
F-body table quits early but in fact it's good to 512g/sec
at 12KHz (both of these being PCM code limits). You would
have to substitute the late model Holden MAF table to get
the proper high-end cal, and the '98s I believe have a lower
MAF frequency clip. At any rate, the stock MAF flows more
air -for the same frequency- than the other Delphi MAFs and
since frequency is a limit to sane readings, that matters. With
a turbo you can overcome the minor flow@pressure loss with
a bit more pressure (unlike NA where atmospheric, is all there
is).
If you substitute another stock MAF and still see low frequency
codes pop up, figure it's the speed-density side needing some
cleaning up.
Stay away from the Granatelli stuff. The Delphi MAFs, at least
have known good flow/frequency tables that you can tune with.
I would avoid the SLP unit, it's faked to look "close enough" to
the stocker but you're paying about an extra $79 for them to
solder on a resistor, and I am suspicious about the fidelity
across the airflow band, with that approach to "tuning". You
can get a kit with the adaptor harness, hose and stock Delphi
85mm for less (though tuning is then mandatory, while you
could half-*** along with the SLP unit for a while. Though the
early-years SLP version deliberately bends the reading lean
("improves performance", heh) which is just what you -don't-
want for a boosted motor.
