2017 Silverado L86 w/ LT4 Supercharger Cold Start Help

[Moodyblue92]

Hey how's it going everyone? So I have a 2017 Silverado 6.2 and we are having issues with getting it to start when cold. It will fire off and then the rpms will just drop down until it dies. Once there is some heat in the the engine it will start and idle no problem. At times I am able to give some throttle input to keep it alive long enough to get some heat in the engine at which point it idles on it own, other times throttle input will have no affect on it whatsoever. It is near impossible to get running when cold without killing the battery. I have contacted several tuners about this issue and none have been able to solve or pinpoint the issue so far. I'm looking for any advice or input on this. We are currently on 93 fuel. Here is a list of the modifications done to the truck.


2017 Silverado 6.2 L86 with 8L90 transmission 4WD

Modifications:
LT4 Z06 Supercharger
LT4 Injectors #19420334
HPFP from LT4 Z06 #12642287
LPFP from Armageddon 465lph
4" Intake
Texas-Speed Drop in Rods/Pistons(JE)
Texas-Speed Gen5 LT1 VVT-2 Cam w/ +32% Fuel Lobe, 231/235, .645"/.635", 116 LSA, 112 ICL
Johnson Link Bar Lifters Slow Leakdown Hydraulic Roller
ARP Head Studs
Innovators West 10% Overdrive Crank Pulley
Grip-Tec Supercharger Pulley 2.38"
ICT Billet Tall Supercharger Adapter Plates w/ Idler Pulley Relocation Kit
Long tube headers (unknown brand or diameter) Catless to stock exhaust w/ cutout
Transmission Specialties 9.5" 8L90 Multi Plate Billet torque converter 3300-3700 Stall
Flex Fuel

Attached files show a cold start attempt and towards the end I gave it some throttle to keep it alive.

Thanks in advance, Mike.

[GHuggins]

Torque Model, Fuel, Certain lightoff functions and adaptives are the main ones that cause that. Torque model is really wrong, both visually and at the beginning and end of your idle log. Tune almost looks like it's just jumbled together bits and pieces from different vehicles and chopped up stock tables? LT4 vette VE table? Honestly you're better off to plug in the LT4 fuel tables then go from there modding the stock truck tables.

[Moodyblue92]

Yes, you are most likely right about that. This file is from a test that was sent to me by our last tuner that we were working with. I have other files and logs from the last time this was dyno tuned but that is before we changed from the stock truck injectors to LT4 injectors. I'm going to shoot you an email because I see you do remote tuning and I'm looking for someone who is familiar with this platform. I need to get this truck back to my customer with a proper calibration and I don't have the time to figure it out myself.