Quote:
Originally Posted by IneedAZ
i agree and that is what i would prefer...just got complicated cause the dyno at Fasterproms displays in AFR and on top of that i read that it is based on 14.7 Stoich, not the 14.1 our car are based on.
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Your car uses 14.1 if you put E10 in it. My car uses 14.1 if I put E10 in it. If we use any other fuel, the ECU is no longer based on using 14.1. That is why these cars need a flex sensor and setup correctly. Not all fuel is E10 as it can vary just like E85. Although it usually is only a couple percent variance and the ECU will use fuel trims to clean up any error. If you have a flex sensor with a stoich table setup correctly then the ECU will always be using the correct stoich ratio for the fuel used.
Brett Stewart targets 11.7-12.0 using the 14.7 gas scale on LT4's. He chooses not to use Lambda for whatever reason. I couldn't get a answer why.
Also I would not advise running above 6.0ms on the injectors if the SOI table is stock and not set up to allow more injection time. The start of injection is based around when to start injecting fuel based on crank degrees. We can start injecting fuel earlier then stock which will allow for a little wider pulse widths and still maintain complete combustion. This is why your really good tuners invested in a 5 gas system instead of relying strictly on a wideband the gen5 platform. Once you start spraying fuel outside of the injection window the wideband reading is useless. It will show dead rich and you are likely lean because unburnt fuel is going out the exhaust. I personally seen this happen on my brothers C7Z when it ran out of fuel...it started showing really rich.