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I think just about any will work. The EC2 uses a 5K ohm, so I am using that with the Fueltech too, but anything that can return a voltage 0-5V should work.
Dave Leonard
Bobby, I believe so, Now at the risk of sounding stupid (which I am), just what size OHM trimpot is required? Does it make any difference? Neil. Neil, If I understand correctly it’s the same methodology. Main fuel table is based on MP. Secondary fuel table is based to TPS. Trim pot is used in place of TPS. Tune with the trim pot at the 50% setting and provide a smooth fuel transition for rich or lean within a percentage you are comfortable with. Bobby From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, July 30, 2021 5:07 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] FW: FW: [FlyRotary] Re: Fuel Tech Dave and Bobby, Below is response from my bloke in OZ who is the expert in Fueltech. So looks like I now just need the trim knob and not the TPS. What do you think? Neil. Hey Neil The way they have done it on the microsquirt is to really overcomplicate something that doesn't need to be done. The way that was mentioned first is going to be the easiest way to do it. We make a main fuel table that is based off the manifold vacuum/boost, then apply a % correction based off the TPS. Which in this case will just be a trim knob. The good thing as well is we can have fuel enrichment based off manifold pressure change which will allow for the change in throttle if there is ever enough of a change that it requires extra enrichment. This is all delta changes, so if manifold vacuum/boost changes in a slow manner then there is no need for extra fuel, but if the delta is high because of a rapid change it will compensate. So I would do as suggest and fit the trim knob and wire it to the ECU as a TPS Nathaniel Alt Phone: 678-493-FUEL (3835) Dave, Last year a purchased a Microsquirt to play with on the bench. I managed to get a working manual mixture control. It uses two blended fuel tables. The Fueltech may have a similar way to modify the fuel formula. I like the build in screen of the Fueltech. VE1 – Speed Density – Primary Fuel Load VE2 – Alpha –N - Secondary Fuel Load - 10K trim pot (all tuning done at 50% TBS position / center of trim pot) Secondary fuel - multiplicative Multiply MAP – don’t multiply VE2 – test values. TPS position moves vertically within the column. 
Bobby From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, July 27, 2021 5:14 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Fuel Tech No, the EC2 does not use a TPS and I don't have one mounted. A TPS is not really necessary in aviation use because we don't have a lot of big rapid throttle changes or throttle-RPM mismatch situations. This is the TPS adjustment table that I am going to try to start with. Fine adjustment in the middle and larger adjustments at the extremes of travel on the knob. Super easy to change the table based on what I find works best. Dave, you are a cunning boy! Do you still use one on the throttle, I suspect not? Neil. The fueltech has a programmable mixture table table to be used with a throttle position sensor(TPS) which is simply a potentiometer. So simply mount a potentiometer, tell the fueltech it is a TPS, and adjust the TPS mixture adjustment map to your liking. There you have a manual mixture knob. In fact, the EC-2's Control board returns the voltage of its 5K ohm potentiometer so I hope to simply use that one which is already mounted. It is also possible to use the micro switches in the EC2's control module to activate almost anything you want through the fueltech.
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