Good day,

I purchased this car last December and have been slowly bringing it back. I plan to daily drive it, so I added power steering and AC back to the car. Both the AC and power steering are working as expected after some troubleshooting. I added the IAC/FIAV back to the car to help with the cold start and no idle that I had when I first purchased the car. I have boost leak tested and repaired all leaks, replaced nearly everything gasket/seal that I could (including both transfer case seals). The car drives reasonably well, but I have very little experience with DSMLink. I was able to dial in the fuel a bit so that it idles reasonably well, but still shakes the car a bit. I want to see if I can get a smoother idle based on what is in my log. I would really appreciate some overall feedback on the tune, too. Thanks! I could be asking for too much considering the mods that are currently on the car:

This is my mod list:

Engine / Turbo System​

• 6-bolt 4G63 engine
• ARP head studs
• HKS 264/272 cams
• Tubular exhaust manifold
• 20g
• S90 billet throttle body
• GM IAT sensor
• GM 3-bar MAP sensor
• Speed density setup
• DSMLink V3 (socketed ECU)
• FIC 1050cc injectors
• Front mount intercooler (FMIC)
• 3" exhaust
• Upper intercooler pipe upgraded
• Greddy blow-off valve
• Walbro 255 fuel pump
• Aftermarket oil catch can
• Oil feed/return lines upgraded
• Oil return leak currently being addressed

Fuel / ECU Tuning​

• DSMLink V3 tuning
• Speed Density enabled
• Injector scaling/tuning for 1050cc injectors
• Base fuel pressure adjusted:
  • Originally ~47 psi
  • Later changed toward ~40 psi
• Wideband O₂ (LC-1)
• GM sensors integrated into DSMLink

Cooling System​

• Aftermarket aluminum radiator (CX Racing style setup)
• Dual slim electric fans with shroud
• Battery relocated to trunk
• Plans/repairs:
  • Rewire front fans
  • Fan circuits through underhood fuse block
  • Considering independent fan relays
• Factory fan control modified because radiator did not have factory thermo switch provision
• FIAV installed
• ISC installed
• S90 throttle body setup retained

Drivetrain​

• AWD drivetrain
• ACT 2600 clutch
• Transfer case leak repair pending
• Transfer case/input/output seals being investigated

Brakes​

• CTS-V big brake upgrade
• Researching Tesla Model 3 Brembo caliper swap options
• Looking at hub-centric/adaptor solutions

Suspension​

• Megan Racing lowering springs
• KYB AGX adjustable struts
• Rear KYB AGX + Megan springs installation planned/being completed

Wheels / Tires​

• 17x8 Platinum Reprisal wheels
• Offset: +40
• Tire sizing discussed:
  • Looking for a size that keeps speedometer accuracy

Interior / Electronics​

• Battery relocated to trunk
• USB charger added/planned
• Rear speakers repaired/planned
• Dash trim installed
• Rear carpet installed/planned
• Rear view mirror installed
• Electrical cleanup ongoing

Exterior​

• R65 maroon/burgundy exterior
• Front bumper work completed
• Side markers completed/resealed
• Front headlights polished
• Headlights and side markers installed/planned
• Front emblem installation pending
• Passenger-side molding repair pending

A/C System Upgrades​

• New compressor
• New drier
• New expansion valve
• Evaporator installed
• Converted/serviced system for R134a
• Repaired AC wiring issue:
  • Found break between AC thermo switch and low-pressure circuit
  • Added jumper wiring to restore AC request signal
• DSMLink AC request working after wiring repair
• Currently producing cold air

Current Remaining Items I Have Tracked​

• Fix rear speakers / USB plug
• Repair oil return leak
• Finish transfer case leak/seals
• Complete fan wiring cleanup
• Passenger-side molding repair
• Front emblem installation
• AC tensioner bolt repair

Overall build theme:​

A street-driven AWD 1G Talon TSi with a built DSM foundation, targeting roughly a 400–500+ hp capable setup with:

• FP Green/20G-class turbo
• 1050cc fueling
• DSMLink speed density
• FMIC
• upgraded clutch
• upgraded brakes/suspension
• OEM+ restoration touches