So I finally got a new unit in the dash cubby to replace the Nexus 7, so I can keep an eye on things once again with the BtSsm. IAM still around 0.LOW.
I've been wondering for a long time if it's simply because they run 100 octane in Japan and the best we can get is 98? When I got the car I was running 95 in it, then when I changed to 98 it didn't make any difference to the IAM. The IAM has always been low, and any time I gave it a bit of reasonable accelerator, or had a semi-loaded trailer on the back, the IAM would instantly go down to 0.000, before recovering (!) back up to 0.2ish several days later.
Last week I bought a bottle of Octane booster ( NF race octane booster ), which has been independently tested to give up tp 6 Ron increase. I put in half the 375ml bottle which should equate to 3 Ron increase which would bring the 98 up to 101. Went down to the petrol station ( 7 Eleven which sells Mobil petrol ), tipped in half the bottle, and filled up with 98. The next morning once the new juice had got through to the engine, the IAM instantly went up, right up to 1.0, before settling at 0.625, where it stayed for the rest of the week until I put my trailer on the back, and then the IAM went down to 0.375, still better than pre-octane booster. The thing that really convinced me though, is that the several times I'l given it a bit of reasonable accelerator which previously would see the IAM instantly plummet to 0.000, it has not moved, stayed exactly where it was.
I filled up again last night, whiteout adding more octane booster, and we'll see what happens,. The octane booster at $45 a bottle is too expensive to use all the time, but I think I'll start using it when I know I'm going to be pulling my trailer or some other hard work for the car.
So that's my unscientific research to date, still more testing to do to see what I can get out of it.