I was talking from my experience as well, not out of my ass, all I said is that there were a number of reasons why it could have changed...thanks for the personal attack though :rolleye2:
No personal attack intended, but in July you were convinced that you gained 25hp between dyno runs and wouldn't listen to anybody.
temperature, humidity, engine temp, maintenance, wear and tear on the engine all play a role. =| also calibration of the dyno. Dynapacks require alot of maintenance and calibration.
As I said, temp, humity, engine temp and calibration were the exact same (incredibly, the temp was 6 degrees lower and the rel hum was likw .5% lower...taking into account the SAE CF, there should be no difference). They had saved my cal file from the previous year. Granted my engine had an extra 20k miles or so, but I did seafoam/plugs/cleaned my intake filter a month ago. Also dida compression test, perfect score all around. The first dyno was with about 90k miles, this one is around 110k. The two possible explanations for the nearly identical power curves are:
1) 93 octane has no effect
2) My engine lost exactly the amount of power that 93 octane had increased it by across the entire curve.
What's more reasonable? 4 dyno runs were within 1 peak WHP of 4 dyno runs taken a year ago...I put 93 octane in my car for 8 months because I believed/hoped that it increased power (and theoretically it should), but I can't possibly believe it right now.
I can't seem to find another dyno comparing the two octanes then again I can't find my wallet even if its in my back pocket. Was there any other dyno comparison that proved otherwise?
Negative, just that statement from the Honda engineer. In order to really prove the effects, the dynos would have to be taken thousands of vehicle miles apart to ensure that the ECU had fully adjusted to the changes.
ok.....so are there really any REAL benefits for using 93?if not im gonna friggin start using 87 no doubt!
Better driveability at low RPM/high throttle (no pinging) when it's hot and humid out. I'll be using 87 this winter but might go back to 93 in the summer.