Just had a thought, If you force a little bit of air AFTER the Air Flow Meter, this would LEAN out the mixture would it not??? Would anyone recommend this? Would it work? What would it do?

I thought of this when i thought back to when i took one of the resinators off after the AFM.
Just thought maybe it would do something.... As long as the engine was still getting the same amount of air pressure through the AFM...

Just a thought i might ask about.

Would run like ****, your getting unmetered air in ur Engine.

My car was running like crap, took it to EZBoy, he noticed that the caps I had used when I removed the resonators had a slight leak. Removed the caps and put resonators back in. Solved.

Would run like ****, your getting unmetered air in ur Engine.

My car was running like crap, took it to EZBoy, he noticed that the caps I had used when I removed the resonators had a slight leak. Removed the caps and put resonators back in. Solved.

Speaking of those resignators, what the hell are they actually there for ???... is it actually worth anything by taking em off ??

If you let too much in your car simply won't run, The O2 sensor which is placed after the combustion cycle checks for amount of air coming out as opposed to air coming in and if there is a big difference it won't run, or will run like crap. I found this out accidentally when i forgot to plug my resonators up.


Speaking of those resignators, what the hell are they actually there for ???... is it actually worth anything by taking em off ??
They quieten down your intake, they won't make any difference to your car, except for making it abit louder (more of a drone).

Thanks for that explination M4DDOG.

I was actually thinking of putting a secondary intake pipe BEFORE the AFM. But have a pressure release valve that only opens when a significant amount of vacuum is created when you put the foot down.

But seems this O2 sensor is what wont make this work....

Would this have been a good idea or not? Disregarding the O2 sensor...

Speaking of those resignators, what the hell are they actually there for ???... is it actually worth anything by taking em off ??

resonators, dude, because they resonate :P

Helmholtz resonators, to be precise.. I believe the volume of air inside them vibrates with a frequency the same as one of the loudest/most prominent sounds created by the intake system, but 180 degrees out of phase, so they cancel each other out.

Thanks for that explination M4DDOG.

I was actually thinking of putting a secondary intake pipe BEFORE the AFM. But have a pressure release valve that only opens when a significant amount of vacuum is created when you put the foot down.

But seems this O2 sensor is what wont make this work....

Would this have been a good idea or not? Disregarding the O2 sensor...

The ECU switches into open loop when you put your foot down, so the O2 sensor won't be looked at.

It's only a good idea if you know your car is running rich, and you can somehow control the amount of extra air you're adding. If you just created a bypass of some random size and hoped for the best you run a big risk of making things worse.

The ECU switches into open loop when you put your foot down, so the O2 sensor won't be looked at.

It's only a good idea if you know your car is running rich, and you can somehow control the amount of extra air you're adding. If you just created a bypass of some random size and hoped for the best you run a big risk of making things worse.


I realise that it could make your engine ping like crazy by running TOO lean. By having a pressure release valve, could i not vary the amount it opens by the amount of vacuum the engine produces? Therefore the air flow would only get greater the more open the throttle is. Which would mean more fuel to keep the ratio alright...

Im all up for suggestions and constructive criticism.

The ECU switches into open loop when you put your foot down, so the O2 sensor won't be looked at.

It's only a good idea if you know your car is running rich, and you can somehow control the amount of extra air you're adding. If you just created a bypass of some random size and hoped for the best you run a big risk of making things worse.
Yeh it would work if you could tune it properly (so that the amount of extra air coming in would be the exact amount of extra air you need, assuming you know exactly how rich your car is running.

And yeh i never drove the car with the resonators off, so if you had a way of closing the bypass at idle or low rpm, you shouldn't have any issues with rough idling.


I realise that it could make your engine ping like crazy by running TOO lean. By having a pressure release valve, could i not vary the amount it opens by the amount of vacuum the engine produces? Therefore the air flow would only get greater the more open the throttle is. Which would mean more fuel to keep the ratio alright...

Im all up for suggestions and constructive criticism.
You could maybe try using a similar setup to the standard butterfly, like have the bypass as a cover over the resonator hole, and when you press the accelerator it opened up the cover a certain amount. You'd need to tune the tension in the wire to how much air you want in and when, this i would assume would require alot of dyno tuning to perfect, as ctuhlu said you don't want to just chuck it in and put it on any setting and hope for the best.

could u seriously be bothered with this? sounds like a massive pain in the ar$e for something that could cause serious engine damage and probably wont give you any power worth bothering with...

I realise that it could make your engine ping like crazy by running TOO lean. By having a pressure release valve, could i not vary the amount it opens by the amount of vacuum the engine produces? Therefore the air flow would only get greater the more open the throttle is. Which would mean more fuel to keep the ratio alright...

Im all up for suggestions and constructive criticism.

It'd be an interesting experiment. If you just used some kind of pressure sensor to control airflow you'd be limited to either a linear or some kind of logarithmic response curve, neither of which are likely to cooincide precicely with how much extra air you'd need to provide to keep the engine at whatever AFR you were aiming for. Gut feel is you could only set it up to give you your 'optimum' amount of extra air at a particular load point rather than get it right everywhere, unless you introduced some manner of electronic control into the equasion..

.. at which point you're basically installing a MAP sensor into the manifold and using a computer to drive a solonoid or something to control the amount of bypass air, which is probably a lot more sophisticated than you were thinking of getting :D

It'd be an interesting experiment. If you just used some kind of pressure sensor to control airflow you'd be limited to either a linear or some kind of logarithmic response curve, neither of which are likely to cooincide precicely with how much extra air you'd need to provide to keep the engine at whatever AFR you were aiming for. Gut feel is you could only set it up to give you your 'optimum' amount of extra air at a particular load point rather than get it right everywhere, unless you introduced some manner of electronic control into the equasion..

.. at which point you're basically installing a MAP sensor into the manifold and using a computer to drive a solonoid or something to control the amount of bypass air, which is probably a lot more sophisticated than you were thinking of getting :D

Thanks for all the input guys.

I was just trying to put ideas in writing. Thats what this forum is all about is it not?

Thanks for all the input guys.

I was just trying to put ideas in writing. Thats what this forum is all about is it not?

Too right.. we wouldn't be friends if we didn't tear your ideas apart and stomp on them to humiliate you then systematically destroy any concept of self-esteem you may have through ridicule.

Group hug!

;)