Update,
initial baseline dyno test done. Not fantastic results at all but there is always a reason!
Dyno Test (Evolve Dyno Dynamics)
Z4M Stock + Afe Intake Kit
High Octane Fuel
I am sure many of you have seen this dip at 6000rpm.
See below a quick data log from one of the runs above.
We can clearly see the ignition timing is dipping just before 6000rpm on the data log and this corresponds to what's happening on the dyno also exactly.
Comes back up on the data log and then also on the dyno graph. Ignition remains pretty much the same to the rpm limiter after than and again the graph corresponds well by pretty much flattening off.
So why is this?
Well, to understand this we can look at a few different factors.
IAT - we can see from the dyno graph the ambient is around 24 degrees. The actual IAT is 29.5degC through the run. Not bad but clearly the AFE heatsheild is not doing the best of jobs with our very powerful fan. However this is not a high enough IAT to really worry about.
Knock values per cylinder were all measured and remained consistent. No sudden spikes or anything to worry about.
So why?
Well, we can look at the ignition maps to understand what's going on here.
Below is the Ignition timing full throttle target map for under lowered conditions:
As you can see the shape of the ignition curve in the data log is very similar in that there is a dip very close to just under 6000rpm and then it begins to rise and plateau.
The DME is not still allowing even these targets (around 1-2 degrees less).
So, tomorrow morning we will test again and data log again.
We can estimate the power curve as we know from multiple tests what the shape of the power curve should look like when the DME allows ignition timing for optimal conditions or not lowered conditions.
We will compare the torque through the rpm range to other cars and make an educated guess as to what realistic power should be made.
Clearly there is no knock going on.
If we get a chance we will retest tomorrow morning.
Just thought this bit of information would be very useful to you all and give you an understanding of what actually goes on and why.