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swathdiver
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Here's another look, 1st gear only:
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swathdiver
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The Lucas Oil is an octane booster, went into the gas tank. Should have written it more clearly. As Chris mentioned previously, the misfires might be coming on because the injectors are firing rich. I reckon it is either the valvetrain being a little loose or it is the leaky intake gaskets.
George B
¯\_(ツ)_/¯
James,
I always thought unmeasured air from an intake leak would result in a positive LTFT not negative.
I always thought unmeasured air from an intake leak would result in a positive LTFT not negative.
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swathdiver
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I dunno, just know that it has negative trims always and leaky intake gaskets. I'm tired!
Hey George, what do you think about making a 1st gear pull and graphing it out?
George B
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I could do that some day. It’s snowy today so all I would do is spin.
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swathdiver
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Yeah, that would be a problem!
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swathdiver
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So in this top one we extrapolated the data between known points, filled it in so to speak, and then pulled the data for the last graph in 250 rpm increments. Still looks pretty much the same and is more uniform now.
Fun stuff, now I can't wait to do the same for the Sierra and that glorious 6.2!
Fun stuff, now I can't wait to do the same for the Sierra and that glorious 6.2!
George B
¯\_(ツ)_/¯
So, engine torque through 1st gear?
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swathdiver
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Yes, the very first chart included 1st and 2nd. Then removed 2nd gear data, incidentally, torque was higher in 2nd, horsepower essentially the same.
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swathdiver
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This is the 1st of 2 runs into 3rd gear. This chart shows 1st gear only. Torque was highest right after the 2-3 shift at 395 foot pounds. The data from this Snapshot was in the Engine section under Auto. Transmission Data where it says Torque Delivered.
2nd run showing first gear only, a little more torque overall and more linear. The data from this Snapshot came from the Transmission Module and says Engine Torque. Is there a difference? Doesn't seem so. torque also peaked in 3rd, 395 foot pounds throughout 4200-4300 rpms. She shifts in the 5700 range, I know guys spin these to 6,200 and by the looks of the graph, I think it would pull to 6,000 easy.
No 417 foot pounds! Is that because of her carrying my fat butt, a 6" lift and each of those Nittos weighs 81 pounds? Truck weighed about 6,500 pounds for these two pulls.
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