I just ordered a new Innovate LM-2 wideband!!!
My engine is mostly stock except for the exhaust system.

I am looking for some insight on a safe tune using Lambda or AFR for different situations.


Here is what I found around the site so far...

WOT: Should be between 13:1 and 13.5:1 AFR, anything closer to 14:1 could kill and apex seal.

Cruising/MPG: 14.7:1 AFR and up to 16:1 AFR as long as the engine runs smooth.

Idle: ~11:1 AFR


Is this info correct?

Don't want to kill the DD!!!

 

I was just looking this up too.

 

on a nonturbo? you couldn't blow it up if you tried

 

What are you using to control fuel delivery?

 

I know on the turbo rotaries that 13:1-13.5:1 is much too lean. I believe people here shoot for 11-12:1.

 

yes what are you using to tune? 13's under WOT is fine.

 

Apexi SAFC... the first digital version.
Gonna tune it for idle and WOT only as the TPS is useless on an S4.

 

Some AFR data from a stock S5 NA & after turning some fuel out w/ an Rtek 2.0 (http://www.pocketlogger.com/index.ph...e=2&ecu=S5NA):

Before: http://www.pocketlogger.com/images/r...o_af_stock.jpg
After: http://www.pocketlogger.com/images/r...yno_af_mod.jpg

 

I know what I gotta do, I just have to go ahead and DO IT!

 

just subtract a few percentage points across the board at first, then make some more precise adjustments. you can eyeball the wideband. it doesn't have to be exact on an n/a. you can do it in 15 minutes if you know how to use an SAFC.

 

FWIW, 11:1 is too rich for idle, typically 12-12.5:1 is where they're happy.

 

Thanks Rice Fryer!