I have heard that some high end sports cars can run closed loop WOT, but my self educated guess is that takes FPGA levels of speed and parallel processing to pull off.

 

That's scary. Wonder what kind of O2 sensor it will use.

 

A lot of modern cars run full time closed loop, and most aftermarket EMS's (anything worth buying does anyways) do as well. My 2011 F150 runs full time closed loop. They use the "standard" Bosch wideband sensor. Looks the same as what comes in just about every Wideband AFR gauge kit.

 

thats pretty cool. Thinking about it though its probably not anything special compared to the cars actually driving themselves around these days. Those Lidar sensors apparently create a huge amount of data. I remember hearing 10 gigs per second, but that was like 3 or so years ago so who knows what its upto now.

 

Can our ECU safely operate in closed loop? Which aftermarket EMS can? I haven't heard anyone switching yet. This would allow us to make mods and have it self adjust right? No more need for retunes?

 

Fuel should be tuned pretty spot on before enabling closed loop. Closed loop is meant to correct for small changes like +-5%.

 

What's the advantage of staying closed loop over preset map for WOT? Only better economy and slightly better power? And with a bad tank of fuel, wouldn't closed loop be at higher risk?

 

Stock Evo ECU can't do it. Advantage of full time closed loop is AFR targeting, and all of the advantages that brings.

 

Had something similar to this happen to me; porcelain broke off cyl 2. Ran a comp test and 2/3 were low. Will be rebuilding in the next few weeks. Sucks to hear what happened to you brother. Best of luck!

 

It's pre ignition that does it.

From the pics of the plugs its running too lean.
Too lean at high load, too rich at low load.
Too lean and too much timing causes pre ignition with E85 which then bends the rods. Once the rods bend, they break and go through the block.

Seen it many times with noob tooners and E85.

 

Are you thinking you have bent rods causing low compression?

 

Honestly; I'm not even sure what to expect. I'm just "assuming" rings might be worn. I will update you next week when I should have it all disassembled hopefully for next Saturday.

 

Use a borescope and look at piston tops as you rotate each to TDC. If rods are bent, it won't come all the way up on block.

 

I borescoped each one and they seem to extend most of the way up. Either way the whole thing is coming apart next weekend. 625 studs finally came in after a 2-3 week wait lol

 

what are you planning to do for build? If rods are not bent, you probably don't want to keep them still right? Upgrade rods and pistons?