turbodisplay
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| posted on 6/6/10 at 03:49 PM |
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Anyone use a MAF sensor with an aftermarket ECU?
As above, thinking of fitting a new processor (32 bit 80 mhz) to my ecu and using maf sensors, instead of a map sensor.
Reason being is that sequential turbo requires diferent maps as the VE will change depending on which turbos are working.
Anyone have any pointers, problems thay found with MAF?
Darren
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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MakeEverything
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| posted on 6/6/10 at 04:18 PM |
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Its supposed to be less accurate..... apparently. Megamanual says that MAP is more precise and offers a better VE table, but ive yet to try either!!
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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turbodisplay
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| posted on 6/6/10 at 04:31 PM |
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See my best guess is that it is less accurate as megasquirt is quite a basic system. What a car manufature does is calculate how much air is going
into the engine per stroke (mass/rpm = mass per stroke) whereas megasquirt uses a voltage to feed into the table so has lesss dynamic range.
Looking at bosch data the accuracy is 3% which i recon is better than map if you consider how the manifold pressure varies (valve pulses etc).
One plus point is that mapping should be easier as you know the mass flowing in so you kow how much fuel is needed for a given afr. Rather than
guessing VE.
Darren
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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MikeRJ
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| posted on 6/6/10 at 05:26 PM |
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Dynamic range can be a problem with turbo applications - I know the MAF sensor on my tin top isn't capable of measuring flow at WOT and high
RPM. AFAIK the ECU uses a MAP sensor in this case.
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tomgregory2000
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| posted on 6/6/10 at 05:46 PM |
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My SR20DET runs MAF only and an Apexi power fc ecu
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