Whats the deal with runnig maf less
11-23-2005, 08:38 AM
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Whats the deal with runnig maf less I'm planning on getting a fast 90/nw 90 set up and I heard about people running there car with no maf. How does this work. I thought that is something the car needs to have to run. Do you just deleate it from the system and tune for it? 
I would like to know morw about how this works. Please do tell. Thanks fellaz.
I would like to know morw about how this works. Please do tell. Thanks fellaz.
11-23-2005, 08:53 AM
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Go to the PCM/Tuning section and poke around, lots of good info there. Do a search for speed density and/or maf-less tuning, and you'll find what you're lookin for.
11-23-2005, 01:29 PM
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Im no expert, but our cars are designed to work with both SD and MAF tuning. i think people disable the MAF's because SD tuning is easy and fairly reliable. However, I think people overestimate how hard MAF tuning really is...I just read one of the stickies here and figured it out myself. Its not that bad, and the throttle response with a properly tuned MAF is *very* nice.
For a track/race only car, sure, shitcan the MAF, make 1-2 more hp, do a SD tune. But for daily driver all weather all condition AC running heavy traffic sitting but still romps when we stomp on it cars, MAF + SD = YAY
For a track/race only car, sure, shitcan the MAF, make 1-2 more hp, do a SD tune. But for daily driver all weather all condition AC running heavy traffic sitting but still romps when we stomp on it cars, MAF + SD = YAY
11-23-2005, 01:46 PM
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I would say most people don't want to think about how many inputs are used for the PCM and find themselves overwhelmed with the seemingly endless array of calibrations required to make a modified engine run "factory."
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11-23-2005, 07:30 PM
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though I'm no tuning expert, I've been reading up on it a lot recently, and basically SD has a few main advantages:
-It makes big cams purr like kittens
-It improves throttle response greatly
-You gain some HP by eliminating the stock MAF
It is easier to tune SD than with a MAF, but I think most people do it for the above reasons.
-It makes big cams purr like kittens
-It improves throttle response greatly
-You gain some HP by eliminating the stock MAF
It is easier to tune SD than with a MAF, but I think most people do it for the above reasons.
11-23-2005, 10:20 PM
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it only improves throttle response if the you disable the MAF when the MAF calibration is off and you dont fix it. if the MAF has been calibrated properly, it will *improve* throttle response over SD.
11-23-2005, 10:37 PM
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Even with a big 'ole cam? I thought the reversion caused the MAF to no workey good, so the VE tables are a better source of information as far as your engine is concerned.
11-24-2005, 10:21 AM
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from what I understand (and I could be wrong) the MAF comes into play gradually. completely > 4000 RPM. At idle it dont do much, its all VE baby. Once you get a little over idle, reversion goes away anyways, unless your running a huge cam.
I tuned a friends GTO with a 230ish/110lsa cam with stock exhaust and got it to idle good by messing with throttle cracker tables and such. Now 230/110 aint a huge cam, but its good sized. I also *think* theres other things you can do to minimize the effect MAF has at idle and cruise.
Edit: im just running LT's and a CAI for now, and even those minor mods were enough to totally bork the MAF calibration, and once I got it recalibrated, the throttle response is way better than stock. Since my ride is a daily driver in varying conditions, I want to stay with the MAF for now. For something only driven in nice weather and on the track, getting rid of the MAF might be worth it.
I tuned a friends GTO with a 230ish/110lsa cam with stock exhaust and got it to idle good by messing with throttle cracker tables and such. Now 230/110 aint a huge cam, but its good sized. I also *think* theres other things you can do to minimize the effect MAF has at idle and cruise.
Edit: im just running LT's and a CAI for now, and even those minor mods were enough to totally bork the MAF calibration, and once I got it recalibrated, the throttle response is way better than stock. Since my ride is a daily driver in varying conditions, I want to stay with the MAF for now. For something only driven in nice weather and on the track, getting rid of the MAF might be worth it.
11-24-2005, 06:56 PM
#14
Originally Posted by Steel Chicken
For something only driven in nice weather and on the track, getting rid of the MAF might be worth it.
11-24-2005, 10:49 PM
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Originally Posted by WS6FirebirdTA00
i drive my car 24/7, no matter what the weather is. i run MAFless without issue. you are right, the maf is used above 4000 rpm because that is apparently the point at which flow is laminar and the MAF is actually reliable.
