Asking ChatGPT For Build Plan

[supradan]

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?

[Alan L]

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

[supradan]

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

[dedyplay]

I agree lol.

[mark houghton]

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.