SLP MAF Maxed out!! need options!!!!
or a speed density tune 
05-31-2009, 06:14 PM
#6
OL & MAF is another option. Further, the tuner could interpret the airflow for the last 3 or 4 MAF table inputs above 5K RPM. Regardless, the PCM will default to the lower commanded A/F ratio whether it be from the OL table or the PE RPM table.
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05-31-2009, 10:28 PM
#10
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I think its not the maf thats the problem its the PCM it only reads up to a certain amount of air, just go with Speed Density and be done with it! No down sides... Thats currently what my car is running!
05-31-2009, 11:26 PM
#13
Another option is the Abaco digital 97mm maf. they have great succes in boosted aplications. They also don't max out as quickly as stock type meters. speed density is probably cheaper but you will have to retune for optimal results during summer and winter due to temp or just tune when it's really hot outside so you will be safe. I always perfer running a maf. I am fixing to get this maf soon as I just got the Fast Toys 104mm lid to go with it.
06-01-2009, 06:58 PM
#15
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SD tune...it is way cheaper in terms of you dont have to buy a maf or worry about when the maf you do buy is going to be maxed out. And don't listen to people so much about the weather because your computer "knows" what the weather is, thats why there are sensors like IAT and MAP both of them will adjust to the weather like hot, cold, dense, or thin air and altitude enough for the car to still run good, if you have a GOOD tuner. If any of these conditions vary too much on any kind of tune you must recalibrate for optimum results! Anyway why do a maf tune down low and an sd tune up high???
06-01-2009, 09:42 PM
#16
Why not? VE to PE is is the format used for a standard tune anyway & OL MAF w/ top end MAF scaling averaged means that he can use the MAF he has & can further dial in the tune using the/OL table w/ PE as a back-up &/or trim.
I'm not arguing against the merit of an SD tune from bottom to top, it's just not what the op has requested. The MAF he has can work & can work well.
This thread should be moved to the "tunning" section.
06-02-2009, 07:51 AM
#18
The top of the MAF table can be calibrated so that the max airflow = max HZ, in your case 11250 HZ. That's what is meant when I said the top 3 or 4 MAF table variables can be interpretations of the airflow @ a certain frequency. Further, OL fueling uses MAP & ECT to determine fueling. PE uses RPM to determine fueling. The PCM will default to whichever of the two is set for the richest fueling. As you can see, neither use airflow (MAF) as the main variable. Although, I beleive MAF is used as a back-up reference.
This is why the top of the MAF table should be scaled accordingly.
By setting OL IAT parameters above normal ambient operating temps, the tuner can choose when to use closed loop & when to use OL fueling.
This is a basic explanation & I believe that you MAF can work by setting it up for OL MAF & setting the top of the MAF table to anticipated airflow.
There are tuning experts (not me) in the tuning section, ie; Frost, Doc, Joecar, Jesse (Waitformeperformance) & a few others that can help you. Also, you could start a post, in the tuning section, to find a tuner in your area.
The people I mention above are the people that you want to speak with & there contact information is in their member ID &/or in their signature. Good-luck
