Asking ChatGPT For Build Plan
 

Hey folks,

I’m in the process of planning out a build for either turbocharged 3.0 or 3.2. So for poops and haha I asked ChatGPT create a build plan for converting a 3.0 motor to EFI and turbocharging it. Below is the response I received. Pretty good start if I may say so, but certainly would not use it. Nevertheless it’s interesting the plan it came up with.

Anyway thought I would share.

Converting a 1982 Porsche 911 SC (3.0L) engine to electronic fuel injection (EFI) and adding a turbocharger is an excellent way to significantly increase performance and tuning flexibility. Below is a detailed build plan for the EFI conversion and turbocharger installation.

Build Overview

Goals
• Replace the CIS fuel system with a modern EFI system
• Turbocharge the 3.0L flat-six with safe boost levels (~6-10 psi)
• Optimize fueling, ignition, and cooling for reliability
• Maintain good drivability and durability

1. Component Selection

Standalone ECU
• Recommended: Megasquirt MS3 Pro, AEM Infinity, Haltech Elite 1500, or Motec M130
• Features needed: Boost control, wideband O2, sequential injection, coil-on-plug ignition

Turbo System
• Turbocharger: BorgWarner EFR 6758, Garrett GT3071R, or Precision 6262
• Wastegate: Tial 38mm or 44mm external wastegate (spring set for 6-10 psi)
• Blow-off valve: Tial, HKS SSQV, or Turbosmart
• Intercooler: Custom air-to-air unit (mounted in rear decklid) or air-to-water intercooler
• Exhaust manifold: Custom turbo headers (Bisimoto, RarlyL8, or custom fabricated)
• Oil system: Turbo oil feed line (from engine case) & scavenge pump (if needed)

2. Fuel System Upgrade
• EFI Injectors: Bosch EV14 50-60 lb/hr (supports ~400-500hp)
• Fuel Rails: PMO, Clewett, or custom fuel rails
• Fuel Pressure Regulator: Adjustable 3.5-4 bar
• Fuel Pump: Bosch 044 or Walbro 450 LPH
• AN Fuel Lines: High-pressure lines with return setup

3. Ignition System Upgrade
• Coil-on-Plug (COP) or Wasted Spark Coil Packs (Bosch or AEM)
• Crank Position Sensor: 36-1 trigger wheel on crank pulley
• Cam Position Sensor: (Optional for sequential injection)
• ECU-Controlled Timing: Retard under boost for safe operation

4. Intake System & Sensors
• Intake Plenum: Stock or upgraded 3.2L Carrera intake manifold
• Throttle Body: 3.2L Carrera or custom unit with TPS
• MAP Sensor: ECU-integrated (handles boost pressure)
• IAT Sensor: Placed post-intercooler

5. Exhaust & Turbo Piping
• Exhaust Manifold: Custom turbo headers
• Downpipe: 3-inch stainless steel (heat-wrapped for thermal control)
• Wastegate Dump Tube: Recirculated or vented to atmosphere

6. Cooling System
• Intercooler: Rear decklid-mounted air-to-air or water-to-air
• Oil Cooling: Front-mount oil cooler (Setrab or Mocal)

7. Drivetrain & Transmission Considerations
• Clutch Upgrade: Sachs or Spec Stage 2/3 clutch
• Transmission Strengthening: Optional WEVO upgrades for 915 gearbox

8. Installation Process

A. Remove Old Components
1. Remove CIS fuel injection system (fuel distributor, WUR, airbox)
2. Remove stock exhaust & heat exchangers
3. Remove distributor (if converting to COP or wasted spark)

B. Install Turbo System
1. Mount turbo headers & turbocharger
2. Install oil feed & return lines
3. Install intercooler & charge piping
4. Mount wastegate & blow-off valve

C. Install EFI Components
1. Install fuel injectors, fuel rails, and high-pressure fuel pump
2. Install crank position sensor & 36-1 trigger wheel
3. Wire ECU, sensors, and ignition system
4. Install MAP sensor & IAT sensor

D. Tune & Optimize
1. Base Map Setup:
• Configure fuel & ignition tables for safe startup
• Set boost controller to wastegate spring pressure (~6 psi)
2. Initial Startup & Idle Tuning:
• Verify fuel pressure, injector duty cycles, and ignition timing
• Adjust idle AFR (14.7:1 at idle, 12.0:1 under boost)
3. Dyno Tuning:
• Adjust boost levels, ignition timing, and AFRs for safe power
• Set boost cut, rev limiter, and knock control
4. Road Testing & Data Logging

9. Expected Performance & Reliability
• Low Boost (~6-8 psi): ~300-350 HP
• Higher Boost (~10 psi with supporting mods): ~400-450 HP
• Considerations:
• Reinforce head studs to avoid head-lifting
• Monitor AFRs, EGTs, and boost pressure for safety
• Regular oil changes & turbo maintenance

Final Notes
• Boost target: Start with 6-8 psi for reliability, increase only with proper tuning
• Intercooling is essential for charge temp control
• Keep a conservative tune (rich AFR & retarded timing) to avoid detonation
• Upgrade brakes & suspension if making over 350 HP

Would you like recommendations for specific EFI conversion kits, turbo kits, or tuning software?

Holy s...t. That is scary.
Alan

Agreed! Scary yet pretty damn cool. I mean it’s not that much off.

I agree lol.

Fascinating, and all done in probably seconds. Imagine the time it would take you searching the web to put all that together. AI isn't smart, it's just a very refined search engine in my view.