The JetCat manual states that the normal range for the "pump start voltage" is 0.100v to 0.325v.....
I currently have 32 hours run time on this engine.....
After every 3-4 hours of run time i would get a "accelerate slow" message on the GSU.....
Thus per the manual i would increase the pump start voltage a tenth or two, and i would get successful starts for another 3-4 hours.....
I am currently at 3.0 volts.....
So, my questions are: is there a maximum pump start voltage in the ECU?...and if so, what is the limit?...
At this point i have a lot more than a thin fuel stream as stated in the manual.....
This also indicates that i have no restrictions in the fuel system in the model, but possibly a restriction inside the turbine.....
Am i making valid assumptions here?
I know i'm over the 25 hour return for service recommendation, and it will be sent in for service very soon....( too cold here to fly anymore this year)
I thought it would be a good idea to post this situation here to get the more experienced P-60 users thoughts and opinions.....

Thanks for any forthcoming commemts,

Richard

Hi Richard,

When you said:

<<I am currently at 3.0 volts.....>>

I hope you meant .3 volts, and I think you are referring to Uaccel1.

Any any case, you diagnoses is very good. What you are seeing can definitely be caused be internal contamination/clogging. FYI, there is "final" filter under the front cover that can be clogged.

As a side note, it is very important to monitor your Max pump voltage at MaxR (maximum RPM) after every flight (or at least every session, but every flight is better for checking the trends).

In your specific case, if indeed your internal filter is clogged, you would normally expected to see a rise in this Max pump voltage as well. This is (almost always) a sign of clogging. But, unlike the Uaccel1, the Max pump voltage has a lot of "headroom", in other words the ECU can overcome some internal (or external) restrictions, but at some point the Max pump voltage will "limit out" and your max RPM will drop.

Having said that, I do not believe that cleaning the inside of the turbine is feasible at home, so just keep an eye on your Max pump voltage at MaxR and send it in when your season is over.

Hope that helps,

thank you matt...
good eyes too...i stand corrected...my current pump start voltage is 0.300 volts...
all in all, it's been a great little turbine...it's still operating on the original glow plug and starter o-ring..

thanks again for your help

Richard