I suggest to data log the values and then review, concentrate on driving, let VCDS do the logging work. So for example the 1.8L turbo engine, rated at 180hp, should have a max flow of about 144g/s. The value you get, 'should' be ~80% of the rated horsepower. There is the full throttle/full load test others use and that is measure the MAF sensor readings at full throttle in 2/3 gear and the engine at maximum rpm. Once again, this is kind of a general rule I use and if you re above sea level, take away a little, few tenths of a g/sec per 500'. So for the 1.8L turbo at idle, the engine should flow about 3.02 to 3.42g/s.Ī lower value of course could be due to false air or vacuum leak, a higher value could indicate a dirty MAF or air-box air flow issues or even wrong parts in both cases. Now this was done on a healthy engine, no false air leaks at idle (No Loads, AC off) while at sea level. ![]() I use a value of about 1.7g/sec to 1.9g/sec then multiply this by the displacement of the engine. ![]() This is sort of my personal rule of thumb and what I do, no guarantees with this. If you ask me, engine at idle, no load at sea level, you should see on a 2.0L engine about 3.4 to 3.6, maybe a little more, 3.8g/sec.
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