Here is the GAMI test from my new engine, after 8 hours. The old GAMI injectors were installed in the same cylinders as before.
It is really good
I will send it to GAMI but I doubt they will suggest replacing #3.
The above was at low level cruise: 23" 2400rpm 11.5GPH, 4300ft +6C. 140kt IAS.
The reason for the big steps in the values is because the crappy JPI/EDM software stores values only if they change by 5F or some such.
A GAMI spread of 0,2 GPH is really good!
One thing to remember about GAMIs: if the engine S/N changes, you need to get a fresh GAMI STC, for $300. They will also send you a corrected injector(s) as required.
I am getting a new #3 injector.
What is really interesting is how close the injectors from the old engine are on the new engine. The last set on the old engine is here and the 0.2USG change is really minimal.
So clearly the main reason for GAMIs is to compensate for the different routes for the incoming air, to different cylinders.
Peter,
I think it’s possible to change the ticker size to 1c, at least on the EDM700 it is.
The POH figures on my TIO540s are ROP at 75% and LOP at 65%. The POH was written long before GAMI was invented (the aircraft is 1973, so the POH must’ve been written in the late 60s, I guess) but the figures are absolutely bang on and work perfectly in my non-GAMI engines.
I think it’s possible to change the ticker size to 1c, at least on the EDM700 it is.
Yes, and I have that, but AFAICT it works only for the display, not for the logging feature.
So, one could get finer data by sitting there and writing the numbers down from the display 
I used to think that JPI changed their software at some point, to increase the amount of data which could be stored, and this is how they did it, but they never replied when I asked them on multiple occassions. I changed the unit from a 2.5" one to a 3.125" one; thread here and I think it happened then; the software could not have got changed at any other point. However a check of old data from 2002 shows that the logged data is always at least 5F between consecutive samples.
The #3 injector was replaced with the next richer size and there is a slight improvement
This time I wrote down the values by hand because you get 1F resolution that way, whereas logging resolution is 5F. But it still is difficult to do well because the EGTs fluctuate by 5-10F.
I own and fly a 2002 Cessna T206H Stationair with a Lycoming TIO-540-AJ1A engine.
Does it make sense to install GAMI injectors on this engine type ?
Thanks for any help !
That depends on how well balanced the cylinders are with the present injectors. Usually, Lycomings are rather terrible as they come from the factory. Have you completed the GAMI lean test?
If you do the lean test (and it needs to be done to exactly their spec) and upload it to SavvyAnalysis, you can send the link to GAMI and they will tell you.
My experience across four TIO-540s is that the spread was so good and close that GAMInjectors were not necessary, and GAMI was quick to tell me so, so they are a decent and honest company to deal with.
My AFM actually specifies LoP operation (on a 1973 airframe) so maybe they put in special efforts to balance the injectors. Having said that, I have engines from all provenances, so it must be a general TIO540 thing.
