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Next on the Tuning tab is AFR/O2, user defined. Sensor types are Narrow Band (NBO2) or Wide Band (WBO2). The difference between the two has been discussed in other posts. Once chosen, you choose the Algorithm, Simple or PID (Proportional Integral Derivative). Simple and PID a have the same...

As I discuss the TS software, I realize that the design engineers back in the day had an uphill "battle" to get the first GW engine tunes up and running. Can you imagine being on the design team and doing the "what if" scenarios. What are the requirements and what do we want to achieve, do we...

Continuing with the Tuner Studio (TS) analysis. The next tab to be discussed is “Tuning”. Once you have the initial engine parameters set, time to understand the engine tune parameters. I am discussing the Tuner Studio features/functions as I understand these for the Speeduino ECU. Most of...

Forum has been quiet of late. Thought I'd post some thoughts that might engender some discussion.

My '85 1200 GW FI ECU replacement/upgrade/modernization project required I install a WBO2 sensor for engine tuning and normal operation. The original system did not have one. I mentioned in one of my posts that an O2 sensor would be good to install to tune carbs. Knowing the AFR for idle and...

A long time ago, in a galaxy far, far away, not really but sounds good when it rolls off the tongue. I discussed the passive inlet air control (IAC) system comprised of an IAC valve, hoses and reed valves actuated by individual cylinder vacuum. The IAC valve is electrically (in parallel with...

Review of various forum thread posts resulted in questions being asked about Oddfire Angles. This is where an engine has different cylinder firing angles. To input Oddfire Angle settings, you set Engine Type in the Engine Constraints section to "odd fire". This enables the Oddfire Angles...

This brings up an issue regarding ECU wiring and relays. There can be a few relays used to control EFI components and what the ECU controls. These can include fuel pump, wide band O2 controller, ignition coils, fuel injectors, fans (rad). Controlling the power to these components with relays...

Update: Working on the ground wiring. Have changed the fuel pump ground, designated as a "dirty" (noisy) - high power ground. Thinking this is a good change. A short story about the grounding of components with pictures. First picture is a small portion of the OEM wiring harness. The green...

Flashback time. Old-New ECUs: You might wonder, what I f you want to revert back to the OEM CFI ECU and CFI system, but why would you? Considering that with the new ECU you can now get at the engine tune and calibrate as required. There are challenges, but the benefits outweigh any...

Update: changed the ECU grounding, checked the engine timing, and started the engine. Got full sync at start, and all its well. Bit too much fuel right now, will be changing VERY soon table cell values soon. Switched to paired fuel injectors to determine if I had a dash tach, no joy...

Update on wiring - ground - issues. Noticed the other day that the dash reset while I was trying to get an engine sync. This has happened before but I could not put two and two together. I harkened this to a ground issue as I do with most wiring issues. Research indicated that this was a...

The OEM wiring harness for the '85/'86 1200 GW FI models is a nightmare to understand and decipher, especially the ground wires. All grounds are tied together somewhere in the wiring harness. There are two grounding points at the front of the bike frame in line with the coils. The grounding...

Small update to this never ending saga. Wiring - the bane of our existence, specifically GROUNDS. having issue with getting the new ECU integrated and engine operating. No ECU sync. Without this, dead in the water. The fellow who designed the new ECU has been helpful, but still no cigar...

Mentioned I changed the OEM wiring harness connector to the Spark Gap X4 connector. Changed the fuel injector layout to paired fuel injectors, kept sequential ignition. Connected the Spark Gap X4 to the system, no joy. No spark or fuel and no crank or cam signal. Contacted the company...

Injector Close Angle, a Reader's Digest version Tuner Studio (TS) for the Speeduino ECU allows the user to determine the fuel injector end time. This is the point in the engine cycle, 2 crankshaft revolutions, in degrees (up to 720°) when the fuel injector will stop flowing fuel to the...

The information I am passing on is directly related to the various pages in Tuner Studio (TS) that I am familiar with and are, IMHO, most relevant. The information presented is from the page(s) being discussed, and amplified with my understanding of the page in question. A small disclaimer as...

Next instalment, Trigger Settings. Trigger Settings: This is all about engine timing. You define the trigger patten, and all parameters associated with this. The trigger settings are a critical set of parameters that needs to be as accurate as possible before an engine start, if not the engine...

Follow-up on the above post. The Injector Close Angle is ATDC. It is recommended that this parameter be calibrated after the engine VE table is well calibrated. As mentioned above, once the VE table is well calibrated and you decide to calibrate the fuel injector close angle, you may have to...

Let’s discuss fuel injectors. Under the Settings/Injector Characteristics tab: Injector Characteristics: Injector Duty Limit percentage (%) – the accepted setting for this is approximately 85% for us laymen. This indicates that a full power/WOT the fuel injector will be at 85% of the full...