PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Idle fueling

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Old May 7, 2008 | 09:16 AM
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Default Idle fueling

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.
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Old May 8, 2008 | 07:46 AM
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why do we not trust a wideband?
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Old May 8, 2008 | 08:00 AM
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because at idle big cams will make widebands lie
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Old May 8, 2008 | 10:46 AM
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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.
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Old May 8, 2008 | 11:53 AM
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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.
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Old May 8, 2008 | 12:40 PM
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Oh sweet what software are you using? What other mods? Sounds like fun.
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Old May 9, 2008 | 07:16 AM
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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.
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