I have noticed the Temperature displayed on my dash appears to be about 6-8 Degrees Celsius higher than ambient. With a comment by someone else running around in my head about the dash temperature being inaccurate, it started thinking..... Our ECU's use the IAT to control mixture and if this is the value being displayed on our dashes, then this could go some or all of the way to explaining why our engines run lean (and stall) because the ECU is being given a higher ambient air temperature than it actually is and hence they run lean........plausible or not...? The Eruption shoots for a 20C shift which apparently resolves the random stalling. I am saying mine is high by nearly half that. So, is it not conceivable to say that if mine was corrected to display actual ambient air temp my bike would be that little bit richer and maybe the random stalling would diminish or vanish, as I consider mine to be close its just needs a little more juice. If we continue this argument, could I or some of us have inaccurate or defective IAT's....? run-it, I look forward to your comments on this and what about doing the Eruption with a 5 or 10 degree shift...?
I'm guessing the air in the box is warmer than ambient and the IAT is an accurate reading. That's just a guess though.
It's called heat soak, heat that is radiated from the engine & exhaust resulting in an increased IAT. A lot has been discussed on this issue over the last two years. Read the threads as run-it has explained the theory behind the concept in great depth a number of times.
Yes if your IAT really is inaccurate as you described it will cause your bike to lean up. But, as AusTR alluded to it may just be that the air in the box really is that hot. You could buy a cheap two probe (thermocouple type) digital thermometer from amazon & find out or you can pull your IAT & measure resistance at various temps to see if its in spec. Yes multiple temperature offsets for the Eruption are possible, it would require R&D but the 20C offset works so there's not a lot of incentive to "fix" anything.
At 100kmh I'm struggling with the temps I see compared to ambient. At this speed there is a therotical 48 liters a second or 2880 liters per minute flowing through the air box, not to mention wind chill factor, so after 10 minutes of open road it should be ambient or below...heat off radiator would be the only additional factor but, this arguable. I have also noticed if I hold WOT for about 2 seconds the temp rises from 22 to 24.5 and drops back again when throttle is reduced repeatedly...odd??. I am going to do some more checking and testing, both ambient static and maybe a probe. run-it. If we shooting for 5 degree shift is this a simple mathematical equation or is there something else in this?
5 degrees is only about .015% incr in fuel for open loop. It may be a simple equation for a mathematician but my math is limited to basic electronics...I'd have to try different, available values & then do the math, which really almost anyone could do.
1. Mention the IAT variation to your dealer if the bike is under warranty to placate your concerns. 2. The 20 deg C offset is a good compromise between performance and fuel economy. Try a 5 or 10 deg C offset and let us know how you go.
...I'll try 10 degrees when I figure it all out,.... it seems its not linear, if 5C only gives 0.015% in fueling increase.
