for now my car is an 01 turbo tiptronic with straight pipe x exhaust, evoms diverter valves and evoms tune.




I was curious the forums thoughts on switching to the hitachi MAF as I heard they are more reliable. I had a few issues a while back with the car going through stock MAF's but since my tune it seems to be resolved and running fine over the past year or so. But now that I am adding the evoms v flow intake, I have the decision to stick with the stock maf or go hitachi...


what are your thoughts?


pic for fun (just got done with ceramic pro detail)
and yes the calipers are pink (my girlfriend daily drives this!)

 

I have one. Works well, but doesn't stand any more oil that OEM Bosch does, so no oiled filters.

 

I've had one ever since K24/20 came on board. Blew through 3 stock ones before switching over, no problem since.
Never did use a BMC or K&N filter so can't comment. Never had much faith in the oiled filter elements anyhow since my days with big block turbo diesels and how much residues were left inside the intake piping. Always liked the dry filter setup

 

Pete, are you running a Hitachi in your present 997 airbag setup? Or was this a previous configuration?

 

Yes, with current setup. It's in the LH intake pipe (in custom made housing) and scaled accordingly. RH has a dummy to show similar flow in pipes...

 

Thanks.

Yes, airbag = airbox. DYAC

 

so the car has a single maf?

is it better to go mafless tune or do this?

thank you,

 

stock setup is a single 5v maf which doesnt hold up under high boost. proper tuners can run a mafless file with stock driveablity. this allows for better air filter placement to also allow bigger y pipe for increased airflow. the key is the tuner

 

Somefoo1 is talking about Pete's setup: 997tt airbox with nice straight runners to the turbos. As he has the stock 996 ECU, he can only run one MAF, so the values are halved in the tune.

Nice setup. I am going this way too. I need to run a 997 airbox to benefit from the 997 GT2 decklid's forced induction - and at present, the decklid rests on my 996 airbox :-s

 

Curiously, now that we have solid MAFless tune options, why would one bother with a hitachi MAF?

 

without getting into a Pros/Cons argument...MAF still has its benefits and place for certain cars/users

 

Does a 997 deck lid fit the 996 or was this a 997 style?

I actually bought a 997 Y-pipe thinking I might be able to use it and it does look much better but it's got some parts that neck down a great deal. I'm going with a custom Y-pipe from SRM as a result and no MAF. Thankfully I've not had issues with mine. I'd be nervous running a dual intake and a single MAF but so long as it's been dyno tested with A/F and nothing changes its better than stock.

 

If there were no need, there would be no MAFs.

The single most vital component in fuel metering is determining the mass of the air drawn into the motor. The mass of the air drawn varies greatly with temperature and altitude. If you run your car and predominantly the same conditions - the temperate SoCal climate, for instance - you can get away with MAFless. Otherwise you are leaving efficiency (horsepower, fuel economy, and emissions) on the table.

There are applications in which a MAFless makes life easier. But aside from any restrictions due to routing of the intake air (such as 32 mentions), a tune with a MAF offers no disadvantages and much greater adaptability for the FI system.

 

The 997 decklid will not fit a 996. Everything from the roof down the back of the car is different (rear window, panel at the base of the rear window, and decklid). But I am a little nutty...
https://www.6speedonline.com/forums/...d-odyssey.html

 

Ah yes, I've been following that build - nice!

I will point out that cars weren't always MAF sensed and they ran fine in all weather. You will also find that most dedicated race cars aren't running MAF. Speed Density works with accurate inputs and doesn't have the restriction of a MAF sensor. Typically a MAF sensor setup for high airflow does poorly at low lazy airflow. MAF aren't a panacea for sure and likely came about because emissions became so strict. MAF can handle hanged in engine effeciency more easily, important when you're an OEM held to a 100K emissions warranty...