Bolock

Has any one installed a S-AFC on a protege any gen?
Im looking for the ECU map or guidance on doing this.

Or if there´s something better for proteges out there, comments are welcome

Thanks!

obender66

Go to www.apexi-usa.com they have tech files on how to install S-AFC on BP engined Protege. There's no info on later models, but by tinkering with jumpers it's probably possible to set it up with virtually any car. They do not list application for P11 Infinity G20 for example, but one of the mags still installed and got 5 hp.
Just do not expect 20 hp out of it.
Alex

Bolock

Is it better than nothing?

Eric F

Isn't this a waste without running boost or N20 anyway? What mods have you done that require you to deliver more fuel than the stock fuel system/ECU can?

Bolock

im going NOS thats why?

do you know where I can get a cable definition for my mazda ecu
the part No is B33R-881B

Eric F

Sorry, don't know about the ECU. What kind of Nitrous setup are you planning on running? I've ordered the ZEX system that comes with 55, 65, and 75 HP jets I think. That system has it's own method of adding fuel when the nitrous is activated though.

obender66

There's a possibility that there's too much fuel above 4500 rpm. AFC would help to lean it out, which may give some power. But it definetely should be used with A/F ratio meter.
I have a theoretic idea about fooling ECU. Throttle position sensor is a variable resistor and at certain voltage, let's say 2 volts, ECU reads it as WOT.
Whati f we modify signal so when throttle is physically open 100% voltage would be only 1.99 volts. ECU will not treat it as WOT and apexi could be useful.
On Nissan NX2000 throttle position sensor resistance could be adjusted, what about FSD engine? Messing with it probaly throw fueling all over the place, but AFC should be able to compensate for shift-increasing resistance will decrease voltage, ECU will think that throttle is open less than it is, AFC will squeeze more fuel. Hmmm, ECU may change ignition timing advance. hey, then we need to get something to control ignition timing.
Is there anybody with shitload of dough to try this stuff
Alex

Bolock

Obender I will get the AFC installed once I get the map for my ECU.
Once I get that ill let you know so you can explain me step by step what you`re thinking

obender66

Unfortunately, its all theory. There's no theories behind construction of plow and it works just fine
Do you have shop manual? If yes, it must have something about testing the TPS voltage.
Alex

Bolock

negative my friend
My car Is Jspec and there is no place here to buy the manual.

Eric F

Leaning the A/F mixture, if it's rich, won't increase power output. It might help mileage though. I'm not sure exactly how the TPS works, but increasing resistance reduces current flow, not voltage.

Bolock

FSM????
= Service manual??

jmauld

That depends. Max power is produced in a certain range of a/f mixture, 13.1 I believe. If the car is so rich that it runs outside of this range, then by leaning the engine out, you will make more power. I do not, however, know what mixture mazda decided to run the protege at.

This is right. If this is going to work, you need to create a voltage divider. Putting a resistor inline most likely won't do anything. Placing one side of the potentiometer in between the TPS and the ECU, and the other to ground, should allow you to reduce the voltage that the ECU sees. *Although, I haven't seen the wiring diagram for this, so I could be mistaken* It may also be easier to simply adjust the TPS so that it never sees WOT.

Also, when you go playing with this stuff, you should NOT trust the factory o2 sensor. They are not designed to give accurate readings in the range where you need it most. You need to have a wideband o2 sensor and an EGT gauge to tune your car properly. Or you could get a dyno shop to tune it.

obender66

Going back to WOT issue. Note, when you drive, even when you push, you don't jam throttle open-it just bogs engine down. I doubt I ever stomp on it all the way down, because applying it smoothly gives better acceleration.
Venom 400 is designed to work at partial throttle only. have to be reason for that.
Which brings us to next question-why it bogs down when gas pedal is mashed all the way down? Not enough fuel pressure? ECU "lag"? I need to loose weight?
Alex