AFC hack work with an MAF sensor?
#1
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AFC hack work with an MAF sensor?
we Just installed a t3/t4 kit on a friends impreza...and he has an AFC....I was wondering if the afc hack would work on that car?
it uses a MAF sensor, instead of MAP
it uses a MAF sensor, instead of MAP
#2
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Re: AFC hack work with an MAF sensor? (SuperDragII)
I though Mass Air units could see (albeit a certain amount) of boost and still compensate, especially with the aid of an AFC..?
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Re: AFC hack work with an MAF sensor? (SuperDragII)
Possibly.
I am sure the MAF puts out a voltage between 0-5V but the range of measurement is different. The MAF measures how much air is going in the engine directly, the MAF just measures pressure and does a bunch of math to get the amount air flow.
You could probably get it to work, but I am not sure if the result will allow a smooth transition. If you do it post here, I am sure Honda will be going to MAF eventually.
Randy
I am sure the MAF puts out a voltage between 0-5V but the range of measurement is different. The MAF measures how much air is going in the engine directly, the MAF just measures pressure and does a bunch of math to get the amount air flow.
You could probably get it to work, but I am not sure if the result will allow a smooth transition. If you do it post here, I am sure Honda will be going to MAF eventually.
Randy
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Re: AFC hack work with an MAF sensor? (VTC_CiViC)
A MAF system is not subject to the rule of not seeing boost like our speed density systems. That's why it is a much bette system to convert to FI because it just see's how much air is flowing past based on how cool the "hot wire" gets and adds the appropriate amount of fuel. Then the only liniting factor is the injector pulsewidth.
Using larger injectors and having the AFC cut them down would work but the part of the hack that's really useful to us is cutting the MAP signal enough to not trip a CEL and that is not needed on a Mass Airflow system.
[Modified by 5 Liter Eater, 1:26 PM 3/29/2002]
Using larger injectors and having the AFC cut them down would work but the part of the hack that's really useful to us is cutting the MAP signal enough to not trip a CEL and that is not needed on a Mass Airflow system.
[Modified by 5 Liter Eater, 1:26 PM 3/29/2002]
#5
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Re: AFC hack work with an MAF sensor? (5 Liter Eater)
A MAF system is not subject to the rule of not seeing boost like our speed density systems. That's why it is a much bette system to convert to FI because it just see's how much air is flowing past based on how cool the "hot wire" gets and adds the appropriate amount of fuel. Then the onlt miniting factor is the injector pulsewidth.
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Re: AFC hack work with an MAF sensor? (SuperDragII)
It doesn't see boost at all, it just meters air flow not pressure. I'm assuming that a cars ECU can be programmed to cut fuel or ignition when the flow rate reaches too high (For example if the airflow reading on a DSM gets too high, the ECU cuts fuel), but it can't see boost no matter how you hook it up.
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#9
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Re: AFC hack work with an MAF sensor? (VTC_CiViC)
I was thinking air flow = pressure...in what respect do they differ?
Is it sort of like how the T25 at 7psi does not equal the T3/T4 @7psi?
how does an MAF function as far as controlling fuel curves?
Is it sort of like how the T25 at 7psi does not equal the T3/T4 @7psi?
how does an MAF function as far as controlling fuel curves?
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Re: AFC hack work with an MAF sensor? (SuperDragII)
Pressure is simply that, pressure. You can have pressure without airflow, for example when you drive into the mountains and have to pop your ears. That's caused by a reduction of air pressure.
Flow is the actual volume of air being taken into the engine.
You can have low pressure and lots of flow as well as high pressure and hardly any flow.
If you look at FI cars with a MAF sensor, you'll see that most of them have the sensor near the air filter. Even if the sensor was capable of reading pessure, it wouldn't be able to see boost from that location. Instead it would see a LOT of vacume because from that point air is only going in, not building up and creating pressure.
Flow is the actual volume of air being taken into the engine.
You can have low pressure and lots of flow as well as high pressure and hardly any flow.
If you look at FI cars with a MAF sensor, you'll see that most of them have the sensor near the air filter. Even if the sensor was capable of reading pessure, it wouldn't be able to see boost from that location. Instead it would see a LOT of vacume because from that point air is only going in, not building up and creating pressure.
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Re: AFC hack work with an MAF sensor? (SuperDragII)
how does an MAF function as far as controlling fuel curves?
#12
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Re: AFC hack work with an MAF sensor? (newt2)
thanks newt2
So how does an FI car using an MAF sensor work? What does the ECU base its fuel/ignition tables on?
So how does an FI car using an MAF sensor work? What does the ECU base its fuel/ignition tables on?
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