S3 MAF reading

[Lee H]

Hi guys,

Did some logging last night on the MAF for the first time since owning the car for 4 months. It's not given me cause for concern and drives fine but I thought I'd check to make sure everything was healthy. Did a 4th gear run and logged until 6000rpm. The peak figure I saw was 152.5 g/s.

I understand a healthy, stock 225HP S3 should produce around 180 g/s. So based on the 0.8 x HP calculation my car is possibly producing only 190BHP.

What would cause the low MAF reading - is it likely to be shot? My car is '02 BAM and completely stock. 81,000 miles.

Is there anything else I can perform as a diagnostic check to identify the MAF as 'on the way out' or faulty? or maybe something else is causing the low reading.

Many thanks
Lee

 

[finesse]

You could;

-Unplug the MAF and see if the car drives differently
-Use some electrical contact cleaner to clean the MAF element

-You could remove your MAF and take it to Audi, GSF and Eurocarparts for money off a new MAF

 

[Lee H]

Thanks for the cleaning quide, I'll give that a go - along with disconnecting it too. Buying a new one last resort!

Is the cleaning option reputed to be effective in general?

By the way, the chavved up motor on the Halfords can is an Evo 7.

 

[finesse]

The cleaning does work. I had no boost until 4k (mapped) , sprayed a bit of cleaner on ze MAF job done. 2400RPM = smiles

 

[Matt82]

wowzers... even my golf 1.8t is pulling 156g/s... and im about to start winding the timing forward haha

 

[Welly]

In fairness, you should be logging to redline really....

 

[Lee H]

Guys, what revs are you usually seeing your peak airflow figure?

 

[Welly]

Redline - 7000 RPM

 

[Lee H]

Redline - 7000 RPM

Ok, cool. Do you think it's likely my MAF reading will increase to 170 - 180g/s with an extra 1000rpm?

At 4120rpm my reading is 104.67 g/s, 5080rpm it's 132.97, 5920rpm it's 152.5. So for every 1000rpm jump (after 4k) , the MAF value is increasing at least 20 g/s.

 

[Welly]

It will certainly increase, how much is a bit hard to say. Go out and log again, but take it to red line in 3rd.