What happens to the MAF?

[sil80drifter]

The stock '90 240SX MAF looks decently sized outside, but on the inside the hole where air comes through is 2 inches in diamater at the most. What do you guys do when you get custom intakes? Do you take out the sensors in the MAF, drill holes in your 3 inch intake pipe and plug the MAF sensors in there? Do you keep ther MAF? It looks like it is very uncapable of beign connected to another pipe because it is SQUARE on one side (the side that conncts to the airfilter box). I am planning to make my own intake instead of buying a CAI for over $100, so I am not sure what to do with the MAF when I get my own piping.

sil80drifter

[GodDrivesA240sx]

The stock '90 240SX MAF looks decently sized outside, but on the inside the hole where air comes through is 2 inches in diamater at the most. What do you guys do when you get custom intakes? Do you take out the sensors in the MAF, drill holes in your 3 inch intake pipe and plug the MAF sensors in there? Do you keep ther MAF? It looks like it is very uncapable of beign connected to another pipe because it is SQUARE on one side (the side that conncts to the airfilter box). I am planning to make my own intake instead of buying a CAI for over $100, so I am not sure what to do with the MAF when I get my own piping.

sil80drifter

you buy an adapter that bolts onto it.

[sil80drifter]

Ok the inner diameter fo the MAFS on my 240 is at the most 2". That sucks big time (IMO) because 3" intake tubing would be completely useless, correct? Can I somehow enlarge the MAFS inner diameter? Do people bore those things out? Help!

sil80drifter

[Exar-Kun]

well I've heard of using the 300ZX MAF, but I dont know if its "plug and play" opr if it requires rechipping or what...

-chet

[sil80drifter]

So in other words, everyone who uses the NA engine, and has some sort of modified intake (RAM air or cold air or etc) are all using the stock MAFS? That is kind of....sucky. Then there really is no point to buying expensive 3" aluminum piping, since one only needs at most 2.5" if not just 2" pipes.

[C-Kwik]

If you want to replace the MAF, you will need to have the ECU modified or have some sort of fuel controller to compensate.

But unless you have a lot of HP over stock, chances are it won't make much of a difference. Years ago, SCC magazine tested a Place Racing intake on an SE-R. The MAF is very similar in dimension to the S13 MAF. They ended up trying to use a MAF that is larger and only gained a small amount of torque in the lower midrange. They figured the power came from a resonance effect, since the cold air section allowed a more continuous resonance through the larger MAF. But peak power remained unchanged. Either way, they said it wasn't worth the money to reprogram the ECU just for that alone.

[EyeStabPeople]

3 inch intake piping is too big... stay smaller like 2.25 to keep ait velocity high, thats what makes the power...

[Exar-Kun]

2.25 intake piping? dude that size would absolutely choke a high boost turbo. it might be OK for N/A applications, but given the distance the air is travelling I dont see how the intake velocity would go down enough to reduce the total air flow into the engine with 3" piping.

just my 2 cents.-chet

[ash1y1]

Is the Injen Intake piping 2.5" or 3"? I installed this on my stock 95 240SE and it almost seemed like I lost a tiny bit of low end torque. Could this be due to the intake drawing too much air? If so, how can I compensate and regain that power? Is there anything I can do with fuel changes or what?

[Cyberkreig]

EDIT: Deleted my post cuz it was mis-information. sorry!

[EyeStabPeople]

2.25 intake piping? dude that size would absolutely choke a high boost turbo. it might be OK for N/A applications, but given the distance the air is travelling I dont see how the intake velocity would go down enough to reduce the total air flow into the engine with 3" piping.

just my 2 cents.-chet

i didnt realize his car was turbo, i was thinking of NA:pface

[sil80drifter]

My car is NA

[Exar-Kun]

I was taking about if you ever chose to bolt up a turbo, you might want a larger intake(or cone..) I am working on fitting a "shortram" style system onto my MAF with a Apex-i intake cone, but I gotta get a adapter for the odd "universal" bolt pattern on the cone itself, and for the little hose running from the egr(?) valve into the stock intake box...hopefully I'll get it built within the month.

-chet

[sil80drifter]

I might be way off on this, but the hose that runs to the intake box is for the heater/AC air to enter the insidfe of the car. Where would one get an adapter for the square side of the MAFS? are they sold separatly?Woudl I have to buy an adapter/cone combo?

[R240NA]

A few notes:S14 KA MAFs have a larger opening that S13s, and can be used with the proper plug.Z32 MAFs will work as well, but require a rewire and reprogram to use.S13 MAF adapters have an extra port for the PAIR valve, the large resonator looking object mounted on the exhaust side of the motor. This is not needed for engine operation.

[sheadee240]

Where are you going to put the AIT sensor?

I was taking about if you ever chose to bolt up a turbo, you might want a larger intake(or cone..) I am working on fitting a "shortram" style system onto my MAF with a Apex-i intake cone, but I gotta get a adapter for the odd "universal" bolt pattern on the cone itself, and for the little hose running from the egr(?) valve into the stock intake box...hopefully I'll get it built within the month.

-chet