Why can't we use bot MAF and MAP like normal turbo cars?
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#8
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Originally Posted by slow
OR why hasn't anybody made a maf that supports a large airflow?
I tune cars with way more air than that through a maf, without issues, just not for GM.
Ryan
I tune cars with way more air than that through a maf, without issues, just not for GM.
Ryan
#12
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We also do alot of Fords and there we just simply move up to larger MAFs, such as the Ford lightning, SCT BA2400, BA2800 etc which steps us into the 1000 HP arena. The SCT software we use allows us to enter what MAF we are using then it automatically rescales other tables such as MAF table, engine and injector size etc to make it work. Before things went full circle again and now again many advocate SD, when set up properly there is no substitute for a MAF system, much more accurate at adapting to changing environment or engine conditions. But setting one up properly is a challenge because of the space needed to keep the airflow strait and non turbulent into the MAF for proper readings, especially on boost blow thru MAF systems.
#13
TECH Fanatic
Well perhaps yes you can rescale all other tables 50% and double the maf to 100%. But there is a hell of a lot of tables and tables relationships etc.
You are right though, there is no reason why its not possible. Just requires some time.
BUT, if you can get the same or better results with MAP only, why bother?
You are right though, there is no reason why its not possible. Just requires some time.
BUT, if you can get the same or better results with MAP only, why bother?
#16
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Originally Posted by slow
map just tell of restriction, maf reads airflow.
What does the pcm use to determine fueling... airflow.
Enough reason for me to like a maf.
Ryan
What does the pcm use to determine fueling... airflow.
Enough reason for me to like a maf.
Ryan
#17
TECH Fanatic
With a wideband to adjust for MAP inconsistencies, usually related to the VE table. Its possible to dial in an accurate table which tracks to within +-1% at various IAT temps as well as right into 2 or 3bar pressure.
As discussed the MAF max's out at around 511g/sec.
While these limitations exist the best solution for FI applications is a 2 or 3 bar map sensor and an accurate VE table with SD tuning.
Im not aware of any other solutions that provide better results than that.
You wont gain anything from the MAF IMHO other than more flexibility for NA apps.
Surely you go with the best available for the application you require, which as far as I can see is MAP based SD tune at present.
As discussed the MAF max's out at around 511g/sec.
While these limitations exist the best solution for FI applications is a 2 or 3 bar map sensor and an accurate VE table with SD tuning.
Im not aware of any other solutions that provide better results than that.
You wont gain anything from the MAF IMHO other than more flexibility for NA apps.
Surely you go with the best available for the application you require, which as far as I can see is MAP based SD tune at present.
#18
TECH Senior Member
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Originally Posted by cantdrv65
Correct but the pressure drop caused by that restriction and read by the MAP sensor is directly related to airflow....Too methods that achieve the same results. I like the MAF sensor myself as well, but it isnt accurate without adjustment as well.
Ryan