snorkel tube size

[rangerrager]

hey guys i made a custom maf adapter to connect to a snorkel i used 2 inch pipe and the check engine light came on and it ran like shit so i have to go to bigger sized pipe what size to guys reccomend can i put a 3inch on the maf for a adapter then put it to the 2 inch pipe for the actual snorkel peice?
thanks guys
ryan

 

[Wicked_Sludge]

sounds like you have unmetered air entering the engine. snorkle size has nothing to do with it. pull the codes and let us know what you get.

 

[rangerrager]

i will but riddle me this if its unmetered air entering the engine then why when i take the snorkel adapter off the maf the truck picks up and runs great soon as i hold the adapter back onto the maf then it runs like shit and the mil comes on again.? its not unmetered air entering the engine its the adapter plate not letting enough air in wich is causing the computer to make the truck run lean and the mil light comes on. so what size pipe should i use to prevent this problem?

 

[Wicked_Sludge]

heres another fun experiment. let your foot off the gas. when this happens, a plate inside the throttle body closes and prevents air from entering the engine. this is called a throttle. it controls the speed of the engine. similarly, a blockage in front of the MAF will decrease the engine speed (if the engine is trying to move more air than said blockage will allow) and not cause a CEL. your engine does not move more CFM at idle than a 2" pipe can flow.

if there is no unmetered air entering the intake, then you have an airflow disturbance (uneven flow into the MAF), cause by an awkward bent, lip, or other protrusion into the intake before the maf.

 

[rangerrager]

heres another fun experiment. let your foot off the gas. when this happens, a plate inside the throttle body closes and prevents air from entering the engine. this is called a throttle. it controls the speed of the engine. similarly, a blockage in front of the MAF will decrease the engine speed (if the engine is trying to move more air than said blockage will allow) and not cause a CEL. your engine does not move more CFM at idle than a 2" pipe can flow.

if there is no unmetered air entering the intake, then you have an airflow disturbance (uneven flow into the MAF), cause by an awkward bent, lip, or other protrusion into the intake before the maf.

this is what i just said that the maf adapter is causing a blockage..
hmmm but that second part is interesting so if the hole in my adapter plate isnt perfect then it would mess shit up hmmm..that makes sense though..causing the air not to hit the sensor itself ..so maybe if i make some sort of mini airbox to to connect to the sensor then connect my piping to that mini air box that would work in theory correct?

 

[kevinsranger]

post a pic so we can figure it out better. i ran my snorkel out of my air box itself

 

[Wicked_Sludge]

couldnt be much worse than it is now, right?

 

[rangerrager]

i am runnning a totally diffrent setup than u kevin,im elimanation the airbox itself and running a filter on the snorkel..i like this setup dont really trust the stock air box for water proofing..but hey diffrent strokes for difffrent folks...


okay wicked looks like im going to be doing some more sheetmetal work after work today going to make that mini airbox and see what happens..thanks i will let u know how it goes tonite

 

[kevinsranger]

http://njmudtruckshome.freeforums.org/yo-yo-yo-yo-yo-t34-45.html

check out this thread. read from the second or third page to the end. it shows two different styles of snorkel air boxes that work great.

 

[kevinsranger]

i am runnning a totally diffrent setup than u kevin,im elimanation the airbox itself and running a filter on the snorkel..i like this setup dont really trust the stock air box for water proofing..but hey diffrent strokes for difffrent folks...


okay wicked looks like im going to be doing some more sheetmetal work after work today going to make that mini airbox and see what happens..thanks i will let u know how it goes tonite

yea i hear you bro, im eliminating my air box too but i am enclosing a cone filter in pvc like the link i showed you.

 

[rangerrager]

i know allot of people run from there airbox i just dont like it dont trust it water can get in there too easy for my liking...i like doing things diffrent u do it your way and ill do it mine

 

[Yellowsplash]

The bend before the MAF is more than likely causing the air to tumble and cause turbulance around the bend into the MAF resulting in uneven readings...this is a problem that is more common in the mustang crowd when adding aftermarket cold air intakes. I wouldnt use 2" piping either. I would go with 2.5-3" piping.

 

[rangerrager]

ok guys so i finished the snorkel built a little mini airbox connected that to the maf then the pipe to the mini air box runs like a champ.

and about the size of the pipe it is fine runs great like a wise man on here once said ur not drag racing through rivers!

 

[Wicked_Sludge]

glad it worked out for you and you got it running right. MAF sensors can be finicky items. a lot of newer vehicles (and even some older ones) are running a honeycomb-like mesh on the intake side of the MAF sensor to smooth the airflow out before being metered. this setup is common on minivans that usually have airboxes inside the fenders, requiring all kinds of goofy bends for the intake to reach the MAF.

 

[Xploda]

Ohh boy im excited to build mine. the pipe is gonna cost like 8$ lol just gotta figure out how to run it though the fender without it looking hacked!