Im in the process of installing my 550cc side feed injectors and hacking the MAF apart. Bassed on the calculations here http://www.ka24development.com/hacked_MAF.html I should be running a bit under 3.5" ID Right.
Somwhere on the board I read that you shouldent use a pipe larger than 3" Is this true?
If any of you have given this a try I would apriciate your input. Is the ECU capable of shortening the pulse with by half so that the car can idle?
Please no "it wont work" posts unless you know that the ECU cant handle this or, you have a hacked MAF system and can give me some input.
ThanksJim
Anyone run a hacked MAF with 550's?
I see what your saying, since the hole is SO large the air flowing through it no longer has a single velocity. The air flowing around the sensor will be slower and give an inacurate reading.
If the car runs after I hack it, then I will take it to the dyno and see just how inacurate the thing is. We will get this figured out. There is no way im paying money for an ecu reflash.
If the car runs after I hack it, then I will take it to the dyno and see just how inacurate the thing is. We will get this figured out. There is no way im paying money for an ecu reflash.
EricZ103 wrote:I plan too run 550cc injectors and a dummy maf, maybe with an afc to clean it up. I don't see why it wouldn't work. the computer can get injector pulses short enough I would think becuase 550's work with e-manage, and it the same concept just a differnt way of achieving it.
I'm pretty sure it will. You just need to make sure that airflow is simmetrical between the two MAFs.
Another, bit more complicated, way to do this is to wire in a multiplier/divider circuit between the MAF and ECU. So you could "resize" your MAF electronically, so to speak. It's kinda what the SAFC does but without a rev table. The circuit shouldn't be too hard since it would only require an IC an a couple of resitances and capacitors.
Or wire in two MAFs into a double adder/multiplier circuit, but it would just be easier to do it with a single MAF. Although with a dual MAF setup you would have twice the room for air to go in.
well, the stock sized MAF is always going to output 0 - 5v. Modifying this signal won't allow you to run more air (and thus fuel) than the stock MAF can handle, since the MAF doesn't really output much higher than 5v for the divider circuit to use.huguetpj wrote:Another, bit more complicated, way to do this is to wire in a multiplier/divider circuit between the MAF and ECU. So you could "resize" your MAF electronically, so to speak.
AceInhole wrote:well, the stock sized MAF is always going to output 0 - 5v. Modifying this signal won't allow you to run more air (and thus fuel) than the stock MAF can handle, since the MAF doesn't really output much higher than 5v for the divider circuit to use.
Basically the stock airflow maxes out just above 240hp if I remember correctly. So if your turbo pulls in more air than that the ECU wont know and POP will go your engine
Thanks for the info about the emage though. Im feeling very confident that this is all going to work.
AceInhole wrote:well, the stock sized MAF is always going to output 0 - 5v. Modifying this signal won't allow you to run more air (and thus fuel) than the stock MAF can handle, since the MAF doesn't really output much higher than 5v for the divider circuit to use.
Yep I know, it's just that the circuit is called that. But anyway, to run 370cc injectors, for example, you would need to multiply the MAF signal by a simple 0,73 factor (in essence divide it) so that the ECU opens the injectors less. You would then start playing from there to "tune" the car.
Of course you are still limited to around 240HP, maybe a bit less since the signal will be smaller. And of course no way to use the 300zx MAF with this circuit. But it is a possibility instead of hacking the MAF.