Ported Stock MAF or SLP MAF
Thread Starter
TECH Enthusiast
Joined: Aug 2002
Posts: 521
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From: Los Angeles
Ported Stock MAF or SLP MAF My Camaro SS has recently been heavily modded. One of the mods that I made was to port my MAF. I'm beginning to wonder if I should have done this or simply purchased an SLP MAF. I am also going to have my car tuned in about a week. Should I keep the ported stock MAF or get the SLP MAF?
Re: Ported Stock MAF or SLP MAF My car is stock so my experience my not be the same as yours. I ported my stock one, then got to reading about all the problems with ported MAFs causing a lean condition. Bought SLP version and wasted my money. I can change them at the track and see no difference in HP, judging from the mph speeds. I've swapped them out several times and can see nothing. For comparison, I can remove the filter and consistantly see a minor increase in mph.
Since your engine could use more air, I would think the bigger SLP version would help. Just a guess, I don't have a modded motor. <img border="0" title="" alt="[Frown]" src="gr_sad.gif" /> I'm gonna keep it as it doesn't seem to hurt performance and I might end up throwing some heads and a cam in one day. Good luck, hopefully someone with a more serious motor than me will chime in and be able to help you.
Since your engine could use more air, I would think the bigger SLP version would help. Just a guess, I don't have a modded motor. <img border="0" title="" alt="[Frown]" src="gr_sad.gif" /> I'm gonna keep it as it doesn't seem to hurt performance and I might end up throwing some heads and a cam in one day. Good luck, hopefully someone with a more serious motor than me will chime in and be able to help you.
Re: Ported Stock MAF or SLP MAF I recently installed an SLP 85mm MAF and haven't seen enough difference to get excited about. The 85mm MAF calibration is almost 12% lower than my stock MAF and I've been tweaking the MAF table to correct this. I'm going to install another one on a friends car in the next week or so and I'll scan before and after results. My car is an SLP SS with A4 and has heads and cam installed. My friends car is a standard SS and is all stock. I'll try and report back when I have some more info.
Cheers,
Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Cheers,
Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Staging Lane
Joined: Jan 2003
Posts: 97
Likes: 0
From: Pennsylvania
Re: Ported Stock MAF or SLP MAF I just installed a Granatelli MAF today. They are a little on the expencive side (269.00) compared to the SLP (149.00). I kind of like it though. It's not a big difference, but it is noticiable. I think it was a good mod.....
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On The Tree
Joined: Jan 2003
Posts: 172
Likes: 0
From: Central MD
Re: Ported Stock MAF or SLP MAF Mods: SLP headers, SLP Y-pipe, SLP high flow cats, Katech stage II heads and cam, SLP smooth bellows, SLP CAI, ASP crank pulley, BMR/Stealth Racing MAF ends, Z06 brakes, Guldstrand tublular pan hard bar, SLP skip shift eliminator, Pro 5 shifter, Lou's Short Stick, Mallory shifter ****, Black Stull Grill, SLP SFC, SLP STB
You should get it just to complete the collection.
You should get it just to complete the collection.
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Re: Ported Stock MAF or SLP 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 headbam:
<strong> I recently installed an SLP 85mm MAF and haven't seen enough difference to get excited about. The 85mm MAF calibration is almost 12% lower than my stock MAF and I've been tweaking the MAF table to correct this. I'm going to install another one on a friends car in the next week or so and I'll scan before and after results. My car is an SLP SS with A4 and has heads and cam installed. My friends car is a standard SS and is all stock. I'll try and report back when I have some more info.
Cheers,
Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Do you mean that the SLP MAF is under-reporting
airflow by 12%? Relative to the stock MAF, or
absolute? How do you determine the error
of a particular MAF unit?
<strong> I recently installed an SLP 85mm MAF and haven't seen enough difference to get excited about. The 85mm MAF calibration is almost 12% lower than my stock MAF and I've been tweaking the MAF table to correct this. I'm going to install another one on a friends car in the next week or so and I'll scan before and after results. My car is an SLP SS with A4 and has heads and cam installed. My friends car is a standard SS and is all stock. I'll try and report back when I have some more info.
Cheers,
Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Do you mean that the SLP MAF is under-reporting
airflow by 12%? Relative to the stock MAF, or
absolute? How do you determine the error
of a particular MAF unit?
Launching!
Joined: Nov 2002
Posts: 223
Likes: 0
From: Houston, TX
Re: Ported Stock MAF or SLP MAF I have a ported stock MAF, and haven't noticed any problems with anything. It does breath a little better, but the mod that I made that made a bigger diff, was yanking out the whole air box, and installing K&N's FIPK. WOW, you can stand by the engine and at idle you can hear it breathing.
On The Tree
Joined: Oct 2002
Posts: 128
Likes: 0
From: Mission Viejo, CA
Re: Ported Stock MAF or SLP MAF I installed a SLP mass air a week ago and it made a huge difference in how the car pulls at mid-high rpm's. With the stock mass second gear didn't have much grunt and now I loose traction in second and easily chirp going into third and that's with slow granny shifting. Before I had to let the clutch out as fast I can to get even the slightest chirp. When I installed my lid I didn't notice squat in the seat of the pants feel.
Re: Ported Stock MAF or SLP MAF The lid is the worst restriction in the
stock air path. It affects only airflow,
and its impact really becomes known at
the top end.
The stock MAF is less than 1/5 the
restriction, by my measurements, but it
has two effects - air flow, and mixture.
The airflow improvement of either of these,
at part throttle, is obscured by the throttle
restriction. However, the MAF's effect on
mixture will be noticeable across the band,
a little mixture difference can make a big
difference in throttle response and part-
throttle HP.
If you get the "right" MAF (for your PCM and
engine's particulars) the mixture cal is a
significant bonus. If you get the "wrong"
one, the opposite. With so many year-year
minor differences in engine and PCM program,
it looks like a crap shoot to me. And going
by the number of used aftermarket MAFs for
sale constantly, lots of people hit "snake
eyes". But the happy ones don't sell theirs.
All you can do is blow on the dice and roll.
SLP sells 85mm MAFs with two different P/Ns,
for the '98-'00 and the '01-'02. Calibration
different, I reckon.
stock air path. It affects only airflow,
and its impact really becomes known at
the top end.
The stock MAF is less than 1/5 the
restriction, by my measurements, but it
has two effects - air flow, and mixture.
The airflow improvement of either of these,
at part throttle, is obscured by the throttle
restriction. However, the MAF's effect on
mixture will be noticeable across the band,
a little mixture difference can make a big
difference in throttle response and part-
throttle HP.
If you get the "right" MAF (for your PCM and
engine's particulars) the mixture cal is a
significant bonus. If you get the "wrong"
one, the opposite. With so many year-year
minor differences in engine and PCM program,
it looks like a crap shoot to me. And going
by the number of used aftermarket MAFs for
sale constantly, lots of people hit "snake
eyes". But the happy ones don't sell theirs.
All you can do is blow on the dice and roll.
SLP sells 85mm MAFs with two different P/Ns,
for the '98-'00 and the '01-'02. Calibration
different, I reckon.
Re: Ported Stock MAF or SLP MAF </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> Do you mean that the SLP MAF is under-reporting airflow by 12%? Relative to the stock MAF, or absolute? How do you determine the error </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I reviewed scan logs taken before and after installing the SLP MAF. At WOT the stock MAF would consistently report 304gms/sec. The new MAF reports 265gms/sec. The trans shift firmness was notably softer and my idle IACs were raised by almost double.
I'm beginning to think that these aftermarket MAFs aren't calibrated to factory specs as they say they are and it is indeed a crap shoot getting one that closely matches the originals output. If anyone has an idea, I'm happy to listen.
Thanks,
Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I'm beginning to think that these aftermarket MAFs aren't calibrated to factory specs as they say they are and it is indeed a crap shoot getting one that closely matches the originals output. If anyone has an idea, I'm happy to listen.
Thanks,
Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Thread Starter
TECH Enthusiast
Joined: Aug 2002
Posts: 521
Likes: 0
From: Los Angeles
Re: Ported Stock MAF or SLP MAF Thanks for your responses. The question is now moot. I am going to have the car tuned this week. I have been told that I did the right things by putting ends on the MAF instead of getting an aftermarket MAF. It seems that the tuning would adversely affect the calibration of the aftermarket MAF.