Larger MAF Housing?

[johnnyd6404]

So I've been searching about this big bore maf housing and I'm quite interested. Has anyone done this and if so how and what did you use... custom or from another car/truck also is a safc nessacery to take full potential from the larger housing or can you just drop it in using the stock sensor. Any layman termed info would be great cuz everything I've read confused me.

[allensteiner]

idk but i don't think it's going to make any difference if you're na.

[G4nismo]

why would you want it larger if you n/a? even if you do install it, your gonna need to get it tuned since you'll be running leaner...

[johnnyd6404]

I read one post on the other forum where it added 12 hp and 15tq with no tune and he wasn't boosted thats what got me interested. I just need some more info trying to get info from those guys is like pullin teeth they're so unhelpful basicaly useless. Search thats their answer... well I have searched and still have questions so what

[G4nismo]

I read one post on the other forum where it added 12 hp and 15tq with no tune and he wasn't boosted thats what got me interested. I just need some more info trying to get info from those guys is like pullin teeth they're so unhelpful basicaly useless. Search thats their answer... well I have searched and still have questions so what

omg are you serious? that post was certainly wrong, i don't even wanna know where the hell you saw that from. keep ur stock housing. You want the MAF to be larger or at least the same size as your TB, with the airway between at a constant size, usually the same as the MAF housing or slightly smaller.bigger housing would prob slow the velocity of the air through the maf sensor and then speed it up again as its going into the engine.

[G4nismo]

plus, judging by what you said, the sum total of your mods prob don't even require a larger MAF housing.

/THREAD

[DaveVQ]

omg are you serious? that post was certainly wrong, i don't even wanna know where the hell you saw that from. keep ur stock housing. You want the MAF to be larger or at least the same size as your TB, with the airway between at a constant size, usually the same as the MAF housing or slightly smaller.bigger housing would prob slow the velocity of the air through the maf sensor and then speed it up again as its going into the engine.

Its true about the gains, it was NMexMax but thats a 3.5 motor....

I did this with the Land Rover Maf housing I forget the model numbers, I felt the gain and tuned the engine back out myself, have yet to get a dyno. Probably won't ever do so with this motor.

I'm going to a 90mm Maf housing with the new motor, now what g4 said about the air flow being slower over the sensor is true, thats why I am using an EU because you can program in the change in size of the MAF housing

[johnnyd6404]

Did you use a different throtle body as well or is it stock.

[Q45tech]

Nissan engineers design MAF so that at redline the housing causes no more than 7" water column back pressure. Below redline the restriction falls exponentially say 1" at torque peak and 3-4" at HP peak.

Anyway 7" is ~ 1/4 psi so the plenum sees 6.8/4 or 1.7% power loss from MAF.

MAF accuracy is critical at idle, at cruise the O2 can fix a +- 15% error [maybe] and WOT an inaccurate MAF may enlean the mixture removing the built in safety [extra richness] to avoid melting cats.

Getting a 6 second dyno run to falsely read better is one thing, protecting the WOT engine on the road [where acceleration is slower] is quite another challenge.

Your cats and exhaust valves/piston crowns are expensive to replace.

Factory always derate what is possible to save on warranty costs and provide reasonable durability out to 150-200k or the exceedingly common now chance of BAD GASOLINE.

[maximaman]

a 30 year mechanic friend of mine has been dropping larger maf cans in na cars for years. As long as the whole intake line is of the same diameter, I don't see how that could be anything but beneficiary for the 4th gen. Remember all the horsepower the max gained from 2000 models was, basically, from getting more air into the motor. And the adaptive learning the ecu has should cover the tuning part. Same as if you add intake... You didn't have to take it to a certifiedmechanic to tune it afterwards. They make adapter plates for the intake to maf, flex tube to throttle body, larger throttle bodies, and adapter for that to the intake manifold. But what do i know... I have less than 50 posts on nico.