MAF screen

[JMA -997]

Hello again!!! I was trying to fabricate a cold air intake using an HKS filter. I used a MAF tube from a buddy with a GT3. It is slightly larger. However, the plastic mesh screen was removed. I put everything together and started the car up. Idling was not too bad but a little rough. I tried running it and it ran slow like the car was so rich. My question is this, does the screen mesh make a big difference??? I know its there for a reason and I was told that it's only there for protection... Anyonne have ideas????? :renntech:

[Loren]

You are using the wrong MAF. 997-1 S and the GT3 are different engines and use different MAFs.

Your 997-1 uses 986.606.125.01.

[JMA -997]

You are using the wrong MAF. 997-1 S and the GT3 are different engines and use different MAFs.

Your 997-1 uses 986.606.125.01.

Hello Loren,

I used my MAF, that I plugged into the GT3 MAF tube from FVD. The only diff that I saw was that the unlike the stock 997-1S MAF tube, the GT3 MAF tube has the MAF positioned a little higher so it isn't as exposed to the air stream as the stock tube that unfortunately is molded in with the airbox. Could this be the cause of the bad metering? Is the GT3 MAF longer than the S MAF?

[Loren]

A GT3 engine is completely different than a 997-1 S engine. They use different parts. I do not know all the differences in the MAFs but just the operating voltage is likely different.

Unless you have the tools and know how to reprogram a DME for different sensors I suggest you stick with the correct parts.

[JMA -997]

Thanks, But I am using my stock 997s MAF. I just wanted to DIY a free flowing induction system. I have a HKS filter and just needed a tube to mount the 997s MAF. The GT3 tube is just a plastic tube that allowed me to install the 997s MAF and mount the HKS air filter. I was just wondering why it runs slower and feels rich.

[Loren]

The tube is likely a different volume and may not be correct for your engine.

Many times changing the intake can cause flat spots and loss of power - I would stick with a BMC air filter (de-pioled) and removing the screens.

[JMA -997]

The tube is likely a different volume and may not be correct for your engine.

Many times changing the intake can cause flat spots and loss of power - I would stick with a BMC air filter (de-pioled) and removing the screens.

AAAH, Yes the GT3 MAF tube is bigger. What is a BMC filter? Thanks!!!

[Loren]

A BMC air filter is the same filter Porsche uses on their race cars. It has increased flow and increased induction noise. It is an oiled filter so new filters need to be wrapped in newspaper overnight to soak up any excess oil so that the oil does not come off and coat the MAF.

I have been running a BMC filter and removed screens for 10 years on my 996 - with no problems.

[goldenwarrior1]

Changing the diameter of the tube changes the velocity of the air flow and effects the readings of the MAF. Todd Holyoak wrote a lengthy comment on it here awhile back while helping a guy change a bigger motor into a Boxster. You should be able to find it with a search.