Edit: I've realised this post is a bit of a rant, you can just look at the pictures and skip to the large text at the bottom.
Read online that horsepower can be fairly accurately calculated by multiplying the MAF g/s reading by 1.25, as the engine aims to burn 1.25g of fuel for every 1.0g of air taken in, creating 1 horsepower. And these reading can be logged in VCDS so that's what I went about doing around the time I got my 200 cel sports cat.
Here is my reading after installing sports cat, without an additional tune, running 99 octane from one of Northern Ireland's only 99 pumps, in Newry:
187.42 at
6960 RPM, so 187.42*1.25 =
234hp. Before the sports cat I made
233hp via this same MAF HP estimation method, on 95 + a serious amount of proper octane booster. Does that sound right? Just gaining 1hp as it's not tuned in yet? Of course such a small difference could be considered negligible, and put down to small inconsistencies in the testing environment, fuel quality etc.
But why is peak power at the very redline??? When this car was dyno'd before the sports cat, running the same amount of octane booster as in my
233hp test mentioned previously, peak power was
232hp at
5833 RPM:
Redid the test yesterday, this time on just 95 octane without any booster. Ambient temp roughly the same as in the previous tests, if not a couple degrees warmer:
ON 95 OCTANE PEAK POWER HAS INCREASED???
190.53*1.25 =
238hp, also at the same redline as the previous tests.
Anyway, I'm not too concerned about the power differences and octane etc.I'm concerned about
why my peak power is at the very redline, instead of around the 5.5-6K RPM range everyone else gets on their MAF readings, just like I did on the dyno. Like in
this guys post for example.
Is there something wrong or am I measuring this the wrong way? Or is just VCDS too unreliable for these kinds of reading and estimates?
Cheers