I spent yesterday making runs and tweaking fuel. I had the cruise perfect, but ran back into fuel cut when I started flooring it. So, I had to spend some time adjusting my maps and working that out.

I had to pull a TON of fuel from what I had calculated and the changes I made to correct fuel cut caused me to have to correct fuel even more in certain areas. Once set, I spent time getting the A/F out of the 10's and then circled around with getting my favorite logging software to display a dyno of the logs from the spd.

I accomplished both for the most part. I still have a whacked out A/F that needs some TLC to smooth out, but I did get at least one decent run to 5k with 1-5 psi (low to high end) with no sign of knock.

However, she still wasn't making anymore than 5 psi. This was very odd so I had to stop and investigate because I had no visual signs of belt slippage. Looking further I found a boost leak at the EGR valve! From the quick look I took, it is vacuum operated and one side has an electrically operated solenoid. When the valve is off on one side, boost from the other side (manifold) forces it open enough to leak. It is sort of like a built in pressure release valve

So, this morning I am going to have to map out a strategy around it. I'm looking to not disable it completely as I don't want a constant check engine light. We'll see, but that is probably going to consume my day today.