Quote:
Originally Posted by Tor
I suppose if it is caused by the AVCS that I could adjust the whole rpm row where it's occurring, in all loads? I'm going to start out with the small change I showed above next time I flash and see that it doesn't mess anything up.
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I would just do it in the load regions you're seeing in that pull and then taper it in the table if it's vastly different. Don't go changing the whole row with a blanket change. Don't forget that you can give yourself more accuracy where you want it by changing axis etc. There's a fair bit of redundancy is the stock fuel map
Quote:
Originally Posted by Tor
Not sure I understand that. If the fuel is not in the cylinder during combustion (because it bypassed the cylinder through the valve over lap). And the fuel in the exhaust is not being detected. Why would it read lean? Why wouldn't it read accurately? I mean the fuel is not there, and it's not being detected.
On the other hand, wouldn't some of the fuel burn in the runners before reaching the sensor? If that was the case (don't know if that is possible), it could read richer than the combustion taking place in the cylinders?
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What I meant was that if there is unburnt fuel in the exhaust, it's likely that it's in air that has gone right through the cylinder without being part of the combustion cycle. This unused air will make the O2 sensor read leaner as there will be a higher ratio of oxygen gas.
If the ignition event is retarded enough that it continues to burn as it exits the valve, then this will still be converted to gases and read more normally. This is more common, but your solution here is less fuel or more advanced ignition timing as this is bad in every way as it causes high EGTs, can damage valves, creates more emissions and usually makes less power.
Quote:
Originally Posted by Tor
I think Kodename47's solution is more elegant as it keeps the MAF scale linear (or exponential or whatever the correct mathematical terms is for smooth  ). |
86Inches on Romraider has just released a spreadsheet that gives a perfect exponential curve, I have yet to flash the result but a well respected user says that it makes the car smoother..... will feed back and post my version of the tool if it works.