Tune necessary for porting MAF?
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From: Tomball/Nacogdoches TX
Tune necessary for porting MAF? I'm descreening and porting my mass air flow sensor tomorrow and my question is will a tune be necessary? Will it run any richer or leaner without a tune? Will it throw codes?
-Brian
-Brian
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From: Lake Zurich, IL
necessary... maybe ... some cars run rich from the factory... MAF ends/descreened MAF lean the car out ... some cars that do run rich from the factory love to run a little leaner...
Other cars you'll get pinging ....
for max effort a tune should be done (even stock cars can gain HP w/a good tune) ... but if you don't get any audible pinging/loss of power ... you can go w/out a tune... you just *may* be down a few ponies...
I would Your best bet IMHO is to either get a tuning suite and learn it... or wait to get a tune until after you do some larger items to the car (engine work, or when you have every bolton) ...
and yes... it will throw codes if it causes it to go so lean that the fuel trims can't correct... (they can correct for part throttle swings of 25% either way ... but closer to 0% correction the better for WOT)
Other cars you'll get pinging ....
for max effort a tune should be done (even stock cars can gain HP w/a good tune) ... but if you don't get any audible pinging/loss of power ... you can go w/out a tune... you just *may* be down a few ponies...
I would Your best bet IMHO is to either get a tuning suite and learn it... or wait to get a tune until after you do some larger items to the car (engine work, or when you have every bolton) ...
and yes... it will throw codes if it causes it to go so lean that the fuel trims can't correct... (they can correct for part throttle swings of 25% either way ... but closer to 0% correction the better for WOT)
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From: Tomball/Nacogdoches TX
Well I have a personal tuner and he has my car tuned just I'm waiting on his wideband to come in and it would be a lot easier for me to just make one stop whenever he gets that in. Instead of going down this weekend for the tune and then next month whenever his wideband comes in.
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Originally Posted by Brian2006
I'm descreening and porting my mass air flow sensor tomorrow and my question is will a tune be necessary? Will it run any richer or leaner without a tune? Will it throw codes?
-Brian
-Brian
Driving around with a ported MAF will give you positive Ltrims and ultimately make you run richer at WOT.
If you drive around with a stock MAF, but then switch to the ported MAF at the track right before you make a run, then you will definately run leaner at WOT. This usually shows a power increase and you get your fastest time.
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Ported Maf
Originally Posted by Brian2006
I'm descreening and porting my mass air flow sensor.
-Brian
-Brian
Originally Posted by moehorsepower
Why are you porting the MAF? All this will do is cause it to run lean and could cause low driveability problems. I have tuned cars with the stock MAF that put down well over 600 RWHP.The screen actually helps direct the flow of air into the heat sensors to reduce turbulence..Leave the MAF as is..
off topic 
With HPtuners 2.x, theres a histogram you can load... Basically, leave your maf plugged in, but set the fail to 0 so that your car runs off SD mode. Then load the maf cal histogram in hptuners scanner. It will record the dynamic airflow (based on VE) for each of the cells in the MAF table (based on maf hz.) Its as simple as copying the histogram into the bin and setting the maf fail freq back to stock.
Originally Posted by GuitsBoy
Then load the maf cal histogram in hptuners scanner. .
Which Histogram are you referring to?
When you say set Fail to 0 - you mean modify the .bin, or is this a function you can force from the scanner ?
Thanks for the help.
Last edited by Closer_2001; Feb 20, 2006 at 10:45 AM.
Originally Posted by Closer_2001
I see MAF AFR Error and Commanded AFR?
Which Histogram are you referring to?
When you say set Fail to 0 - you mean modify the .bin, or is this a function you can force fromt the scanner ?
Thanks for the help.
Which Histogram are you referring to?
When you say set Fail to 0 - you mean modify the .bin, or is this a function you can force fromt the scanner ?
Thanks for the help.
Originally Posted by GuitsBoy
I dont have HPT in front of me, but its one of the presets in HPT 2.x. .
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From: Indiana
Originally Posted by TAQuickness
Until you can tune for it, you safest bet is to leave it alone
Originally Posted by D_Run
Then give us a little "write-up" 
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From: So.Cal.
Originally Posted by D_Run
Then give us a little "write-up"
Originally Posted by 2002_Z28_Six_Speed
Listening.
(...I must have lost the email...?).
VE is dialed in (using OLSD Auto VE Tuning method);
then enable MAF, log MAFREQ and MAF, and use same technique to adjust MAF table.
Or log DYNAIR vs MAFREQ in OLSD.
As GuitsBoy has said above.
Edit: There has been a lot written about this, as RHS said...
Teching In
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From: Indiana
Originally Posted by RedHardSupra
you're kidding, right? this is one topic that's been beaten to death, it's documented VERY well, and it has been that way for over a year now.