2 Stroke V6 injected Outboard Motor

[pdschris]

I am looking for a remapable replacement ECU for 2 stroke V6 Outboard which is being used for racing. Has anybody ever used a GEMS ECU on a 2 stroke before,or can advise which GEMS prouct may be best for this. Also has anyone any suggestions on how to measure burn efficency with the 2 stroke oil in there?

Thanks
Chris

[RickS]

Hi,

Yes we have used a few of our ECU's on two stroke engines before and in marine applications as well. Ideally the EM40 is best suited for you application as it's lightweight and good sealing. It uses similar firmware to the EM36 so the features are similar as described in the EM36 under the downloads section of this website.

In terms of measuring Burn efficiency the EM40 does have a parameter that can be logged called injector pulse width which could be used along with fuel temperature to produce a fuel Mass flow rate. It also has a parameter called Fuel Total which adds together all of the fuel pulse widths. If your oil and fuel are either pre-mixed or the oil is pumped in at a measured rate using your Mass fuel flow calculation you can work out the amount of KJ's entering the cylinder. Using a Mass air flow sensor volumetric efficiency can be found and you could work out a power and torque curve from this. Comparing the Mass Fuel Flow against the Mass Air Flow and AFR in the exhaust might give you an idea of engine efficience as you can work out AFR going in and AFR coming out but it's a long way around.

Thanks for your enquiry.
Ed

[pdschris]

Thanks for your prompt reply Ed.