Official Thread for posting daily FE updates

[DRW]

Originally Posted by diamondlarry

I'm not sure how lean it's running but I think that as long as I am very light on the throttle I should be ok. I read an article sometime ago that talks about combustion temps actually decrease when running lean, IE less fuel less heat. I'll see if i can dig that up because it kind of goes against everything I always heard.

Nice job on doubling your FE!

Have you seen this chart? I posted it in another thread. You can see that Exhaust Gas Temp peaks just above stoich, and cylinder head temp (CHT) peaks below stoich (around 13.5 A/F ratio). As you get leaner, temps go down.
http://www.gassavers.org/attachment....0&d=1167022596
I've noticed a loose relationship between CHT and knock, so going leaner than stoich has a counterintuitive effect.

I noticed that when I lean out my car too much the throttle response goes flat at higher throttle openings. It feels fine at light throttle, and I found I can lean it out quite a bit as long as the throttle/load stays light. Cruising on the freeway is fine when set very lean. But when I need more throttle to go up a slight rise, or to speed up a few mph, the car likes a slightly richer A/F ratio. As you can see by the chart in the link, there is a point of diminishing returns. Wish I knew exactly where it was , guess I'll have to find out through trial and error.

edit: let me know if you can't read the words, the resolution didn't come through so good.