Today I helped my good friend John sift through a neat project he ended up purchasing a few weeks back. John is what we would call a connoisseur of these 3000GT's, as now he has 3. 2 of which naturally of non-running / non-driving state - love you John <3. John recently bought a 91 Dodge Stealth (3000GT - same thing), which was a turbo motor swapped vehicle, and after a long night of working on her after purchased non-running, John got the car running.. but realized there was a light misfire.
John's Red 3000GT - This Dodge Stealth Turbo Swap will end up going in this at some point!
John decided he would inspect some of the general engine health by doing a compression test, pulling and replacing the sparkplugs, and eventually using Noid lights revealing that cylinder 1 would appear extremely dim in comparison to the other cylinders.
Not being a 3000GT Expert, I pulled the wiring diagram for a turbo vehicle in alldata and told John to check the injector resistor pack - which on the swap vehicle... did not exist. Pictures and service information show it right next to the firewall and John was able to check his other VR4 in his backyard and confirm that the turbo motor should have a resistor box. Perks of being a 3000GT hoarder!
The reason for the resistor box is for the low impedance injectors that they were using at the time to more reliably fuel vehicles that required a higher volume of fuel like high performance machines. This does not really apply nowadays as we have much nicer, modern High-Impedance Injectors that are the choice for most in performance. The DOHC Non-Turbo 3000GT actually has a High Impedance Injector, and at the time this was not evolved tech so it was for lower fuel volumes.
Upon further inspection John found inline resistors on the groundside line of all of the fuel injectors buried near the injectors themselves - I.E. NOT the OEM location of the Injector Resistor box - using something like a 6ohm 50w load resistor for the injectors to help decrease the load put onto the ECU drivers. One of the injector resistors upon a resistance test ended up measuring out over 100ohms, and upon replacement the car ran pretty good! But this got me thinking about how all of this happened in the first place.
I will get with John at some point and have him really outline some more of the 3000GT's trim level differences and intimacies, however through some diagram analysis on Alldata I have come to understand the following:
#1. The 3000GT DOHC Non-Turbo and Twin Turbo Engine Computers SHARE the SAME PCB HEADER. This would allow you to take a Turbo Engine Computer and use it with a DOHC Non-Turbo Engine Harness.
#2. Adding the Wastegate Solenoid Control line, Switched Power, and some inline Injector resistors for the low-impedance Turbo Injectors on the Non-Turbo Harness and you'll be off to the races !(I think*) This is what John did!
#3. Somehow this conundrum is currently working in this Dodge Stealth which originally was a SOHC V6 VIN vehicle.
#4. Dodge Stealth = Mitsubishi 3000GT / GTO = SAME
That is all for now. More to come later..
Cheers everyone and Happy Creating!
-The WireDaddy- Nate :)
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