Testing Lean Burn on my RX8.

[Xist]

Originally Posted by pgfpro

My best savings at idle is when I shut the engine off. So I turn my engine off a lot instead of having it burn fuel at idle.

I tried that last night...

[Harlan]

Just got done making a chemical based hydrogen generator and popping hydrogen balloons. Yes I still have eyebrows.

Tomorrow I'll be road tuning/testing lean burn. In a few days I'll be testing hydrogen injection.

[Harlan]

Road testing was a bust. Could not get the car to run right in lean burn, I think there were other issues. Re-flashed to try some power runs and then blew out the wastegate flange at 8psi.

So... No luck so far.

[Harlan]

Here is the video of my attempt at live tuning lean burn. I didn't realize it at the time, but I didn't set lean burn up to a high enough load so it kept kicking to normal AFR and surging the engine. I'll do better next time.

https://www.youtube.com/watch?v=eeH1fzim4Kc

[pgfpro]

This is a issue I had when first attempting a 25:1 + A/F. I ended building a lean burn hole in my fuel map with my desired 30:1 in the middle and a leaner value on the outer perimeter to keep the engine from hunting to get out of the lean burn hole. One other thing I found out is I could only build one preset light load lean burn value in the map, because of the space it would take up.

My heavy load 10 to 14psi would run at 20:1 A/F with no knock on pump 91 octane.

Here is a pic of a light load 53 mph 30:1 A/F. The A/F shows 18:1 because this is a AEM wide band and the max value is 18:1. The mass air an fuel show around a 30:1 A/F ratio. This screen shot is a earlier version with out my pre heat intake setup and EGR enable. I'm now running as much as 2psi at this same mph.

[Harlan]

I'm gonna have to either go that route for future testing or add a hot air bypass to the MAF and run open loop. I'm actually leaning (no pun intended) toward a hot air bypass because it gives me preheat on the air, but I have to have enough of an air path to make it work.

[teoman]

Any updates?

[Harlan]

Still alive, currently working too much to get anything done. (60+hrs/week) Getting a week off soon, so hopefully more then.