Question: Allison defueling tech question - Diesel Place : Chevrolet and GMC Diesel Truck Forums
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Old 08-30-2019, 02:49 PM   #1 (permalink)
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Join Date: Jun 2019
Location: Huntsville, AL
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Allison defueling tech question

So when the Alison calls for a defueled shift. what does the ECU do?

I ask this cause on my 1-2 and 2 lock up I see my desired fuel rail pressure and actual fuel rail pressures separate. then come back in other gears.

so then I tried 2 and 3rd and 4th, locked up, and making a pull in each gear, and the Cp3 can keep up with full rpms, and boost and engine load.. so that tells me the fuel delivery is not a problem. but something is telling it to de fuel.

but if in the tune it would be the desired FRP.. so I would see my data logs showing it wanted less and got less.

SO when the TCM calls for less fuel, would it show in the Desired or only actual?

2007.5 LMM LTZ, lifted 6" on 22x12s and 35s, AMP Steps, DSP5, 5" MBRP down pipe back - (strait pipe) dumped & deleted, Nictain Cat Fuel Filter swap, Edge CST2 Monitor, W/EGT), ATS rear diff cover.

2007 C6 Z06, 754RWHP (Heads & Cam 427, Procharger @ 7lbs+meth)
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