I have been working on a Monaro and have produced a car with a very nice tune.....
The VE is spot on and it always produces commaded A/F when in PE but I keep coming up with a problem......
when on the dyno/or highway on a full power run the PCM starts pulling timing (not knock) from about 4800rpm up to 6200rpm by about 2-4deg
If I do the same run in SD there is no problem, but I want the car to run a maf......
the current answer is maybe the Maf is going out of range! so I used the above excel doc (nice bit of work) and re tuned the maf but the new curve is within 2-5% of the origional and I still have the PCM pulling timing......
the max numbers are.
MAF (g/sec) = 40.47 (306.59)
Dyn Air (g/sec) = 40.48 (306.67)
MAF (Hz) = 10058
RPM = 6201
one other thing I noticed was that if you did a normal dyno run i.e. 4th gear low rev's and go WOT until 6000rpm the PCM would pull timing at around 4800 up BUT
If I had even throttle at 4000 the then went WOT I would have no timing pulled.
Is this because the sharp move into WOT at a high RPM meant the PCM used the VE table as a lookup until the Maf could regain control and therefore not use the Maf table?
this car is producing 410hp from a stock car but if I could get over this problem it would pull 420+hp no problem......
Any advice would be cool.............................