SLP MAF (early version) - tuning
11-02-2004, 08:24 AM
#1
On The Tree
Thread Starter
iTrader: (4)
Join Date: Dec 2002
Location: Sleepy Hollow, NY
Posts: 149
Likes: 0
Received 0 Likes
on
0 Posts
SLP MAF (early version) - tuning I have a SLP 85mm MAF which I purchased soon after
SLP started offering these. Without any adjustments (MAF Translator)
I get flow readings (lb/min) which are about 4...5 lb/min lower
than with the stock MAF. Typically I get a max of 38.5...40.5 lb/min
at around 5900 rpm WOT in 3rd with the stock MAF and my bolt-ons.
With the SLP the inidcated flow at the same rpm will be around 34...35lb.min,
although in actuality it should be higher than the stock MAF. I would not expect the SLP to flow much more than the stock MAF because of the
same stock TB and the same LS6 intake opening, but maybe a few %
more (the difference in cross section is 25% more for the 85 mm SLP MAF).
Should I tune the output frequency of the MAFT such that the indicated
SLP flow with EFILive is at least 38.5...40.5 lb/min at WOT and that the
light throttle ltrims are close to zero?
Gert
SLP started offering these. Without any adjustments (MAF Translator)
I get flow readings (lb/min) which are about 4...5 lb/min lower
than with the stock MAF. Typically I get a max of 38.5...40.5 lb/min
at around 5900 rpm WOT in 3rd with the stock MAF and my bolt-ons.
With the SLP the inidcated flow at the same rpm will be around 34...35lb.min,
although in actuality it should be higher than the stock MAF. I would not expect the SLP to flow much more than the stock MAF because of the
same stock TB and the same LS6 intake opening, but maybe a few %
more (the difference in cross section is 25% more for the 85 mm SLP MAF).
Should I tune the output frequency of the MAFT such that the indicated
SLP flow with EFILive is at least 38.5...40.5 lb/min at WOT and that the
light throttle ltrims are close to zero?
Gert
11-02-2004, 07:21 PM
#3
On The Tree
Thread Starter
iTrader: (4)
Join Date: Dec 2002
Location: Sleepy Hollow, NY
Posts: 149
Likes: 0
Received 0 Likes
on
0 Posts
jimmyblue,
do you mean the bulky "black" component soldered across the bars
at the end towards the inner cover? There is also a capacitor
on the other side.
Gert
do you mean the bulky "black" component soldered across the bars
at the end towards the inner cover? There is also a capacitor
on the other side.
Gert
11-02-2004, 08:03 PM
#5
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,605
Likes: 0
Received 6 Likes
on
6 Posts
Mine ('01-'02 model) had only the 2.7K resistor wrapped
in heat-shrink. I've never heard of a capacitor on the
MAF.
Looking at the picture, though, I guess maybe you're
seeing the IAT thermistor that's in the throat of the
85mm MAFs.
in heat-shrink. I've never heard of a capacitor on the
MAF.
Looking at the picture, though, I guess maybe you're
seeing the IAT thermistor that's in the throat of the
85mm MAFs.
11-03-2004, 11:59 PM
#7
On The Tree
Join Date: Apr 2002
Location: Knoxville, TN.
Posts: 131
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by jimmyblue
You could just remove the resistor and use the truck MAF
table, because without that resistor, that's exactly what
it is.
table, because without that resistor, that's exactly what
it is.
Trending Topics
11-04-2004, 08:41 AM
#8
Moderator
iTrader: (11)
Join Date: Mar 2002
Location: East Central Florida
Posts: 12,605
Likes: 0
Received 6 Likes
on
6 Posts
I think earlier years may have a MAF table that stops
earlier and you might just have to discard the higher
airflow datapoints. But, that also means the car will
have a lower point at which the airflow reading stops
making sense. On my stockish setup that is well above
my max airflow and MAF frequency. But if you have a
heavy breather this might come into play.
What is the uppermost RPM column in your MAF table?
11500? If so then you're only going to discard a couple
of right-hand cells off the truck table. Also some models
populate below 1500Hz and others don't (not that it's
very important, my A4 idles at about 2500Hz in Park).
But supposedly the electronic throttle cars can get down
that low on decel.
earlier and you might just have to discard the higher
airflow datapoints. But, that also means the car will
have a lower point at which the airflow reading stops
making sense. On my stockish setup that is well above
my max airflow and MAF frequency. But if you have a
heavy breather this might come into play.
What is the uppermost RPM column in your MAF table?
11500? If so then you're only going to discard a couple
of right-hand cells off the truck table. Also some models
populate below 1500Hz and others don't (not that it's
very important, my A4 idles at about 2500Hz in Park).
But supposedly the electronic throttle cars can get down
that low on decel.
