The ORIGINAL VR4 Clone™ ECU!!!

**GTOJOE** · 05-25-2012, 07:55 AM

Excellent work. If only this was availabe 12 months ago. Would have saved me $1500.00

**99 vr4** · 05-25-2012, 09:35 AM

Originally Posted by GTOJOE

Excellent work. If only this was availabe 12 months ago. Would have saved me $1500.00

You could sell yours on eBay then buy one, go out for a nice streak dinner, and buy a nice cigar..

**GTOJOE** · 05-25-2012, 09:43 AM

Will it run high impedance/saturation injectors? I have a set of Injector Dynamics ID725 injectors that took a long time to locate at the right price lol.

**99 vr4** · 05-25-2012, 10:10 AM

Originally Posted by GTOJOE

Will it run high impedance/saturation injectors? I have a set of Injector Dynamics ID725 injectors that took a long time to locate at the right price lol.

Hmmmmmm..... The DOHC ECU ran HIGH impedance injectors. The VR4 ran LOW impedance injectors. The main difference was that Mitsubishi added the injector resistor pack in line with the injectors. Additionally, according to the manual, the engine cranking drive times are different between the HIGH impedance (36.1-54.1 ms @ 20°C) and the LOW impedance (23.3-34.9 ms @ 20°C) and the engine running drive times are different between the HIGH impedance (2.2-3.4 ms @ 20°C, ECT 80-95 °C, 2,500 RPM) and the LOW impedance (1.5-2.7 ms @ 20°C, ECT 80-95 °C, 2,500 RPM). There is also a note about when the vehicle is new (less than 500 miles) that the injector drive times might be 10% higher. This is obviously related to fuel trims.

Greg, can you provide some input here as to whether or not this can be handled in a flash table?

**Jimvr4** · 05-25-2012, 10:11 AM

Originally Posted by 99 vr4

I will add this to the FAQ as well . . .

Panasonic V Series HB High Temp Reflow Aluminum Electrolytic Capacitor Part Number EEE-HBH470YAP. Rated at 47 µF 50 V (63mA Ripple) and 2000 hours at 105°C. Because there are two of them in the circuit now, the life span should actually be longer.

When deciding on a replacement capacitor, many factors had to be taken into account including the ESR (Equivalent Series Resistance) and the impedance. Additionally there was a limitation on the physical size of the capacitor.

As a 30 year career HW designer I'm very familiar with the factors that you've considered including how to specify electrolytic capacitors. It's clear to me that you are offering a solution as professional as could possibly be done by anyone including the original manufacturer. Great job

**J. Fast** · 05-25-2012, 10:35 AM

I was an electronics guru myself back in the day. I built robots and remote drive automation equipment for AI Electronics and Robotics, Celestica, and Avaya. You guys did a really great job! Thanks from the 3S owners in my chapter and region. Can't wait to play with one!

**BigTyla** · 05-25-2012, 11:58 AM

If I ever get another 3S, this will be the first mod I do. Excellent work.

**Boomer3000** · 05-25-2012, 04:14 PM

Me me me next I want one!!!!

**Greg E** · 05-25-2012, 09:17 PM

Originally Posted by 99 vr4

Greg, can you provide some input here as to whether or not this can be handled in a flash table?

Of course it can. No idea what scaling or latencies to use though.

Don't forget to eliminate the resistor pack from the firewall.

**GTOJOE** · 05-25-2012, 11:18 PM

Originally Posted by 99 vr4

Hmmmmmm..... The DOHC ECU ran HIGH impedance injectors. The VR4 ran LOW impedance injectors. The main difference was that Mitsubishi added the injector resistor pack in line with the injectors. Additionally, according to the manual, the engine cranking drive times are different between the HIGH impedance (36.1-54.1 ms @ 20°C) and the LOW impedance (23.3-34.9 ms @ 20°C) and the engine running drive times are different between the HIGH impedance (2.2-3.4 ms @ 20°C, ECT 80-95 °C, 2,500 RPM) and the LOW impedance (1.5-2.7 ms @ 20°C, ECT 80-95 °C, 2,500 RPM). There is also a note about when the vehicle is new (less than 500 miles) that the injector drive times might be 10% higher. This is obviously related to fuel trims.

Greg, can you provide some input here as to whether or not this can be handled in a flash table?

I will look into it and see if I can find someone local willing to tune it. Not up to that sort of thing yet. If it can be done with tools I'm all over it LOL..... but tuning is over my head.

Originally Posted by Greg E

Of course it can. No idea what scaling or latencies to use though.

Don't forget to eliminate the resistor pack from the firewall.

Cool, Will be removing the resistor and soldering all wires together.