Custom Supercharger and FVD tuning
09-21-2007, 01:31 PM
#16
Race Car
Because the MAF determines engine load, airflow and air temp. Since you are sucking much more air past the MAF that the stock parameters allow, you MUST reduce the voltage produced by the increased airflow or you will get a code Hook up a 560 ohm resister inline and see if that drops the flow down to 4.5 g/s at idle..
09-21-2007, 01:50 PM
#17
no mods are needed to the maf, new program should: change ignition timing, fuel delivery, prevent detonation and fuel starvation above 3000k...Agreed, The new map is supposed to get A/F within operating range... be careful when running without the new programm.
09-21-2007, 01:55 PM
#18
Race Car
WRONG! Unless your goal is to quickly burn up the MAF.
09-21-2007, 01:58 PM
#19
09-21-2007, 02:04 PM
#20
Race Car
09-21-2007, 02:16 PM
#21
Race Car
Why would the MAF burnout, or what causes it to burnout? I do not follow, not saying you are wrong, just never heard of this. Curious what raises the voltage, the computer? And why would it raise the voltage, it knows no different that a S/C is on it or not, it simply has air flow through it.
09-21-2007, 02:18 PM
#22
Race Car
Why would the MAF burnout, or what causes it to burnout? I do not follow, not saying you are wrong, just never heard of this. Curious what raises the voltage, the computer? And why would it raise the voltage, it knows no different that a S/C is on it or not, it simply has air flow through it.
What would happen if you increased the amperage on 14 gauge wire in your home from 15 to 20?
09-21-2007, 02:32 PM
#23
Race Car
Meltdown.
I understand why it will burn up, trying to understand what causes the voltage to increase. Only thing he has changed is the injectors so far. Is the computer raising the voltage of the MAF to compensate for the bigger injectors?
09-21-2007, 02:46 PM
#24
Burning Brakes
Thread Starter
Join Date: Jan 2005
Location: Phoenix, AZ
Posts: 1,032
Likes: 0
Received 0 Likes
on
0 Posts
Why would the MAF burnout, or what causes it to burnout? I do not follow, not saying you are wrong, just never heard of this. Curious what raises the voltage, the computer? And why would it raise the voltage, it knows no different that a S/C is on it or not, it simply has air flow through it.
The MAF sends Voltage (0-5v) directly to the ECU. Using various other sensors (like TPS, and Tach) the ECU adjusts the injector pulses, timing advance/retard depending on the state of the engine. MAF voltage alone directly affects the Air/Fuel Ratio the ECU produces. when a Piggyback Fuel Computer is used (S-AFC2, V-AFC2, Neo, Emanage, UTEC, etc) it intercepts Voltage from the MAF, and modifies that Voltage going back into the ECU (according to your own Fuel correction settings). That's is why a MAF is THAT important. When a MAF fails the voltage output can become erratic. when a MAF is dead the engine cannot Rev past 2500 rpms.
I am assuming the resistor 1999 is referring to lowers the voltage for idle and allows more room (V) for extra airflow under boost with proper mapping.
09-21-2007, 02:47 PM
#25
Race Car
The MAF must receive current to keep the wire a specific temperature. Because of the increased airflow, this current is maintained at it's maximum for greater periods of time and causes meltdown. Just like if you maintained a draw of 15 amps on a 15 amp circuit. It is only a matter of a short time before the circuit breaker pops.
09-21-2007, 02:58 PM
#26
Race Car
I read many moons ago that the wire voltage was maintained at a given number, it did not fluctuate. It was the delta of cooling of the wire that determined airflow, never read it raised the temp to compensate. My interpretation was, the cooler the wire was from a given point, the more air had passed over the heated wire.
My point is, if you raise the voltage to raise the temp of wire, how does it know the airflow difference?
My point is, if you raise the voltage to raise the temp of wire, how does it know the airflow difference?
09-21-2007, 03:08 PM
#27
09-21-2007, 03:14 PM
#28
I read many moons ago that the wire voltage was maintained at a given number, it did not fluctuate. It was the delta of cooling of the wire that determined airflow, never read it raised the temp to compensate. My interpretation was, the cooler the wire was from a given point, the more air had passed over the heated wire.
My point is, if you raise the voltage to raise the temp of wire, how does it know the airflow difference?
My point is, if you raise the voltage to raise the temp of wire, how does it know the airflow difference?
09-21-2007, 03:18 PM
#29
Burning Brakes
Thread Starter
Join Date: Jan 2005
Location: Phoenix, AZ
Posts: 1,032
Likes: 0
Received 0 Likes
on
0 Posts
Since this is a project lets test it. Which wire to hook up the 560 ohm resistor inline with? There are (4) 2 red and cannot remember the other two to the MAF. How can I measure the 4.5 g/s whatever that means at idle with the durametric? I should know immediatley on start up if there is any improvment.