Dual MAF setup

[SingleCamSam]

Anybody ever tried this? I'm not real sure of the theory behind it but it seems that you'd be able to run injectors that are 2x as large as stock with this. One MAF is functional the other is just a dummy. Any thoughts?

[C-Kwik]

I believe JWT and/or Stillen has a kit like this available for the Z32 TT. They did it on the Z more to allow more airflow by using two filters as opposed to having to limit flow by routing all the air through one MAF. It basically uses a MAF to measure air for one bank of cylinders and assumes the airflow for the other bank as a healthy more should flow the same through both sides.

For a 240sx, this would be overly complicated with realistically, no increase in performance over using a larger MAF. You could though, use a similar concept to simulate a hacked MAF to compensate for larger injectors. Kind of a contolled intake leak. You'ld need to be pretty precise in choosing the non-metered pipe size though.

[Structure240sx]

i think it was WDRacing that touched ont his when someone was talkin about a hacked maf. his way of doin it was to drill a hole in the intake pipe after the maf and add a pipe with a filter on the end of it. u would have to increase the sixe of the hole until u got the idle right. this seems like too much trial and error. i would try a hacked maf before something like this.

[C-Kwik]

You should be able to calculate the size of the "leak" you need. Much the same way those that started the hacked MAF craze did.

[SingleCamSam]

Couldn't you just use a diameter the same size as the functional MAF? Theoretically wouldn't this deliver exactly twice the amount of air being read by the MAF? Or do i need to go back to physics 101 hehe?

[C-Kwik]

Only if the replacement injectors you plan to run are double the size of the OEM ones. Essentially you need to compensate for x% larger injectors by making the cross-sectional area of the hacked MAF or total cross-sectional area of the controlled leak plus the area of the MAF larger than the OEM MAF area by x% as well. This is in theory, but in the real world, it may not work perfectly depending on how the ECU and MAF respond. But increasing the cross-sectional area propotionately to the size of the injectors should give you a good starting point.

[SingleCamSam]

So running 550cc's (pretty darn close to stockx2) could theoretically be doable with this setup. Might have to try it sometime.

[Structure240sx]

i dont get why u would use two mafs if u would only have one plugged in and functioning.

[:: orion ::]

Structure -

It would be so that flow between the 2 would be equal...

And one thing we're overlooking here is that with half the air being metered, the ECU will sense less load, and give more timing...which could equal BOOM!!! MKIV Supra guys have issues with this sometimes...

Later - Brian

[ftrs13]

good point, I hadnt thought of that.

I have been considering this option for quite some time. to me that this method is a very risky solution no matter what, therefore "HACKED"

I may continue with this method, but if what you really want is reliability, then just go with the JWT reprogrammed ECU...

... it cost less than a new engine.

Steve

[C-Kwik]

Structure -

It would be so that flow between the 2 would be equal...

And one thing we're overlooking here is that with half the air being metered, the ECU will sense less load, and give more timing...which could equal BOOM!!! MKIV Supra guys have issues with this sometimes...

Later - Brian

But it would be no different than using a hacked MAF or a piggy back. Not sure if Nissans have as much of an issue though. But I'm using an E-Manage which can control timing...