Done a few runs over the weekend to compare the MAF reading difference between a standard ait filter (20K usage), Green filter (about 2.5K usage) and a PD160 intake (fitted with standard filter)

std.pdf

green.pdf

std + Intake.pdf

don't have acrobat installed, can you just say what difference it made?

Also worth noting if this is a standard or remapped car

Has a fuelling only adjusting remap.

I don't see much difference. Would be cool to get three different colour coded lines on to one graph with a key.

Has a fuelling only adjusting remap.

I don't see much difference. Would be cool to get three different colour coded lines on to one graph with a key.

Easier said then done. I've tried. Dont work.

Not a great deal between all three.

Turbo pressure is stock 1.35bar boost. Well it should be but ECU brings it down due to intake temps. The std intercooler is ****e. 4c and I was still hitting temps of 70c in about 20 seconds.

Std

RPM MAF

2856 1210.3

3192 1156.4

3570 1102.5

3906 1048.6

4200 994.7

4452 940.8

Green

RPM MAF

2982 1210.3

3381 1156.4

3738 1097.6

4053 1043.7

4326 984.9

4557 926.1

4641 901.6

Std + PD160 intake

RPM MAF

2667 1249.5

3066 1195.6

3465 1122.1

3801 1092.7

4116 1014.3

4368 975.1

4599 935.9

Not that hard

Had to guess what the "MAF" column was - if I've got it wrong tell me the correct label for it.

Nick, I done the same but are you sure the reading are currect for the RPM range? I thought it was wrong.

Hmmm you're right - hold on ...

Not really sure how to interpret these results? What does the MAF reading mean, and is a lower number better or a higher number?

Chris

Could be another reason why they are pretty similar ....the ECU adapts over time to different things so taking out a standard filter and putting a green filter in straight away and measuring it may not show a lot of effect .....yet!!!........I have found it takes on average two months for the changes to be fully effective

Could be another reason why they are pretty similar ....the ECU adapts over time to different things so taking out a standard filter and putting a green filter in straight away and measuring it may not show a lot of effect .....yet!!!........I have found it takes on average two months for the changes to be fully effective

But the MAF is just a sensor so it is just reporting the amount of air flowing into the engine. These results are then fed into the ECU, so the ECU's learning is irrelevant for this comparison? :confused:

Chris

But the MAF is just a sensor so it is just reporting the amount of air flowing into the engine. These results are then fed into the ECU' date=' so the ECU's learning is irrelevant for this comparison? :confused:

Chris[/quote']

But if the turbo doesn't know how much more air it could pull through...wouldn't that affect it

OK dodgy Excel graph replaced with something a little more accurate.

Looks like the Green filter is worth a little - not sure why you didn't try the Green with the PD160 intake? Are they not compatible?

Hmmm you're right - hold on ...

:P

MAF reads how much air is coming through the induction system before it gets to the turbo.

The idea is with a better induction system would mean more air getting passing through. In return this will more less smoke or you can increase the fueling to get more power.

Just wanted to get some results to see what the difference is between them all, see if its worth it or not.

Just wanted to get some results to see what the difference is between them all, see if its worth it or not.

And your conclusions?

Chris

And your conclusions?

Chris

1 green panel filter for sale with cleaning kit

edit. Seconds thoughts maybe not. Nick graph shows a nice increase.

OK dodgy Excel graph replaced with something a little more accurate.

Looks like the Green filter is worth a little - not sure why you didn't try the Green with the PD160 intake? Are they not compatible?

Cheers Nick I will have a look now.

Didn't have time to try it again with the green in. Was running late.

I would say inconclusive, why does your engine flow less air when at higher revs ?

more fuel = more air.

I would say inconclusive' date=' why does your engine flow less air when at higher revs ?

more fuel = more air.[/quote']

hmm good point as the ECU is holding back...

I wondered that - hence the question about what the "MAF" values actually represent. What does VAGCOM call that reading?

ok.

Right so to make it accurate (ish) A MAF reading would have to be read with the same boost pressure.

So.

Run 1

Std Boost 1308 MAF 1136.8

Green Boost 1308 MAF 1136.8

Std + Intake Boost 1308 MAF 1185.8

Can you log actual vs requested, don't know block numbers.

Std Boost 1308 MAF 1136.8

Green Boost 1308 MAF 1136.8

Std + Intake Boost 1308 MAF 1185.8

This would suggest to me that the intake is initially the week link in the chain as the air flow regardless of filter is going to be restricted by it.

As mentioned this experiment would need Green + Intake to provide conclusive results.

Try logging the torque from the ASR controller. On a 1.8T it is block 120.

That will give a more useful comparison between mods.

Goochie is there any documentation of what these block numbers are, anywhere?