How do you nail down the idle fueling? I understand the spark needs to be where it makes the best vacuum via map sensor; but how do you figure out the fuel. I've read several times never trust a wide band at idle and I understand why. Just not 100% on the correct way to get the idle VE where it needs to be. Any help is greatly appreciated.

 

why do we not trust a wideband?

 

because at idle big cams will make widebands lie

 

WB assumes complete combustion and that doesn't happen at idle. AFR: Just run what works within reason. The exact AFR won't matter at idle.

Mine shakes around from day to day. I can never get it exact. It never reads the exact same from stop light to stop light either. Minor differences.

 

Thanks! I'm gonna start from scratch on my buddies WS6 with the F13 we just put in. Got one tune in there just to get it to idle and mobile. Works okay; but needs tweaked some more.

 

Oh sweet what software are you using? What other mods? Sounds like fun.

 

Using HP tuners. Full bolt-ons, 4.10s, 3500 stall, and a 150 horse plate kit. Before the cam and pulley, the car went 7.304 at full weight with a so so tune I had put together. Oh, this was with a single nozzle that didn't even have a name on it, bone stock suspension, and 3.73s instead of the 4.10s last fall.