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Had trouble getting the Arduino MEGA Pro connected to the Speedy Loader and Tuner Studio. Tried different cables, looked for comm/USB ports, asked for help on the Speeduino forum. PSIG replied and he was having no problems connecting the Pro to his computers. Last kick, I took the cable from...

Going to be off line for a bit, will check the forums as I always do, but won't be posting. Have other projects that need to be attended to. As I have mentioned, these posts are to stimulate the imagination regarding the art of the possibility regarding an EFI installation, not as a definitive...

Dave0430 is correct in where the MAP connection has to be. To use a sensor in the plenum area, it would have to be a mass air flow sensor, and probably before the carburetor, or ITB if fitted. More challenging install. Difficult at times to use the correct wording when trying to explain the...

Tapping into the air plenum would not be my preference primarily because the plenum is too far from the engine cylinders to provide a good MAP signal. The MAP vacuum takeoff(s) on the '85/'86 1200 FI models are quite close to the engine heads as shown by this picture. I would think this is an...

Next discussion item is the manifold absolute pressure (MAP) sensor. Do you really need this, yes. It is the backbone of an EFI system, it provides the engine load indication that is need for engine tuning, specifically the VE (fuel), spark (ignition timing) and AFR tables. You can use the...

Spark Units, aka Coil Drivers (CD) and coils are my next discussion items. Coil driver9s) are required because the OEM wasted spark coils are “dumb” coils, as are most, in that these coils do not have an integral coil driver. Socrace on the NGW forum tried the 1200 GW FI model spark units and...

Taking this installation piece by piece. The next component to discuss is the crankshaft trigger wheel and sensor. A recommended crankshaft trigger wheel is the 36-1 missing tooth trigger wheel. Any trigger wheel that the number of teeth divides evenly into 360 can be used. The 1500 crankshaft...

Time to put the fuel issue to the side and look at the EFI ignition only installation, and we’ll start with the carbureted 1200 GW models. A lot of the following information has already been discussed, but this section of the thread is about an installation as if you are going to do one...

Good morning Dan. The short answer is the fuel pump does not use a pressure switch, and pressure is regulated by a fuel pressure regulator, not the fuel pump. The OEM fuel pump can provide fuel up to approximately 65 PSI. There is an internal recirculating valve that will recirculate the fuel...

Good morning Dave. Thank you for commenting; however, the information I have provided is from the Electrical Troubleshooting manual. Photo of page: I would have thought the same as you, but Honda describes the circuit differently. Reviewed the ignition circuit schematic in the OEM service...

Side trip - new ECU microprocessor is an Arduino Mega 2560. There have been some technology developments. Have been looking at a different Speeduino ECU because I want a Speeduino ECU for bench projects. The new ECU I am looking at is a Spark Gap X4. The interface board is a Speeduino...

Let’s take a. side trip and discuss the issue Safety, personal and equipment. Not going to spend a lot of time on this because a person’s perception of this issue varies from person to person. Rambozo on the GW Docs forum is correct regarding fuel pump and engine ignition control. You do not...

The carbureted 1200 GW fuel pumps (FP) are low pressure, and the operation of this fuel pump is reliant on the ICU for the grounding circuit for the fuel pump relay. The ICU provides a pulsing ground for the FP relay such that it operates intermittently. The grounding pulses increase in...

Mike - good question. The start/stop of the fuel pump on the '85/'86 1200 FI models is a timed issue determined by the ECU programming. When the key is turned to the "ON" position, the fuel pump starts and primes the fuel system. Priming is for 3-4 seconds then the fuel pump stops. When...

It was mentioned that the 1200 carbureted GW ignition control module (ICU) controls the fuel pump. I have done some research into this and the two are interconnected, but not from a control standpoint, unlike the OEM CFI system ECU that does control the fuel pump. The ICU provides a ground for...

A stable and adequate electrical power generation is paramount for any EFI system. If you have been the recipient of a failing/faulty battery in an EFI car, truck, motorcycle or other vehicles, you will know that when this occurs, all sorts of wondrous things start to happen. I’ve mentioned...

I have posted that the posts on this thread is not a how to do an EFI conversion, but to discuss the requirement(s) for an EFI ignition only and a continuation to a complete EFI installation with regards to the components required and considerations when choosing the EFI components. An EFI...

Fuel system design will be a challenge, routing of fuel hoses, filters – before and after fuel pump, which high pressure fuel pump to use, fuel rails, fuel injector connections. There’s no lack of things to consider. High pressure fuel pump – just about any fuel pump that can provide up to 70...

Fuel Injectors – there are two types available, high impedance (high-z) and low impedance (low-z). Both work well. There are a number of on-line articles detailing the specifics of each, saturated, peak and hold and such that you can research. The issue with fuel injectors is the amount of...

I’ve reviewed my posts to date. It would appear that I’m staying on track, chronologically and staying on topic. The EFI ignition only installation is the best bang for your dollar to start, and the easiest to install. The next step is to add fuel to the mix. A good number of EFI components...