Quote:
Originally Posted by wookwook
compete level -
I was just thinking about your comment on fueling for track day. aside from the RC discussion you want to take a look. this graph has the AFR for RC -blue- and my tune -red-. You can see during this dyno RC is running leaner. If your logging it will show up as really red blocks under your STFT graph, running lean. you'll look at commanded vs actual lamba to see if the 02 sensor is showing the ecu calling a corrected air fuel mix at the sensor in the DP. An external WB sensor here, is reading lean in reality. I usually see a good trailing of actual to commanded when I am tuning out a change for a mod. It tends to default lean owing to the other alorithms on the ecu for fuel economy. once you made some change.
100 octane is going to actually aggravate this because if you don't set for a leaner stoich in the fuel map you will really be running lean, esp combined with RC, which interferes with sensible readings. so.. there. the moral is just be aware, plugging stuff in will have consequences .. potentially even worse outcome than avoiding a correction tune because of fear of voiding warranty, people ( not picking on you! ) think tuning is just bad at any expense and plugging stuff on is completely safe. Any one thing may be 'safe' but compounding changes can add up.
Then - towards the high rev range I'm oversaturated with fuel on RC. This can be a huge problem if your combining high heat and unvaporized fuel. Even more so if you have pinging, your getting set up for a failed piston. Personally I am not a fan of fuel for cooling, my race strategy is to say on target AFR.
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Thank you for the info. It brings two questions. How will 100 octane have any effect on AFR? Second is everything Ive ever read on turbos says richer is safer. Is there some other thought on this?
My main motivation toward RC is price, warranty, and ease of uninstall. My mind is not made up towards anything really, I just love to research.