Re: Wide Open Throttle
Ron did mention that his stock speed-o was showing 65 but he had not checked it with a GPS. He has not mentioned, that I saw, what the actual rpm's are either. And the boat is in storage so the actual pitch wasnt posted. So, we have to make some assumptions here.<br /><br />First we'll assume the boat speed-o is correct. Who knows? Maybe it a liquid filled Gaffrigg and is real close if not dead on....<br /><br />Assuming the motor will hit 6000 rpm with a 24 Raker, that means that at 65 mph he has about 12.5% slip. Pretty good but he said 65 wasnt as fast as it would go. So a further assumption; At WOT it will hit 70. Thats about 6-7% slip. Pretty amazing but not likely. 10% slip would be right at 67 mph. Hummm...<br /><br />Lets now assume he has a 26 Raker and can still achieve 6000 rpm (see where we're going with all the assumptions?). At wot of 70 mph that'll be about 13% slip and a bit more believable.<br /><br />Lets look at all the assumptions we just made. Accurate speed, pitch and rpm's. Maybe everything is a good guess except for the rpm's. Maybe it really turns 5500 or 6500. Heck, the only thing we do know is the gear ratio!<br /><br />This is why we do all testing with known accurate instruments. We can still use a dash speed-o. If we make a change and the speed goes down, we most likely went in the wrong direction. We may not be able to calculate accurate slip but we know we most likely went the wrong direction.<br /><br />Aint this fun?
