I did happen to read through that thread. I believe he tested three loads of around 70, 80, and 90% and found 90% to be the best. But I still wonder if 95% would have beaten 90%. Basically, manifold vacuum is wasted power. I wouldn't be surprised if 100% load had the best volumetric efficiency as long as the O2 sensor was allowed to stay in closed loop. Which they are sometimes not due to fear that the lean end of the sweeps will take the mixture lean enough to burn something at such high load. I might be able to borrow the Honda scan tool to find out what throttle angle if any takes the the O2 sensor out of closed loop. The service manager at Honda is a long time gear head and enjoys talking about my edgy ideas. He builds brand new Gold Wings into trikes several a year.
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Quote:
Originally Posted by Old Mechanic
Difficult to determine on your 250 but it seems like 90% load is best. Here is a thread by Sentra with a lot of good data that may be relevant, but I would do my own testing to determine which is the best. 90% load should work out to 10% of atmospheric vacuum reading or about 2-3 inches.
http://ecomodder.com/forum/showthrea...oad-19594.html
Of course they are completely different vehicles-engines but I think you may find the best acceleration is more a function of load that anything else, as long as you are in the right gear, neither too low or high.
regards
Mech |