Burner71
Member
I picked up a 2007 Challenger 180 215hp this summer. I have never been able to get this thing over 7650rpm and 42mph. I found a good mechanic and he has changed the oil, the plugs, cleaned the IC and added a catch can. Still can't get over 7650. The prop appears to be original and was pretty banged up on the ends, he went ahead and smoothed it all out, same RPM results. So friday he says he can throw on his 14/19 Concord SRX just to see how it does.
The boat now runs at 8150RPM but never faster than 38mph.
What am I missing here? Shouldn't the rpms have gone down and speed up? Assuming the stock prop was a 13/18.
Any ideas why? Maybe the prop isn't fitting the way it needs or I used the wrong prop? Just curious.
Plan to add external cooler, injectors and bigger wheel this winter.
The boat now runs at 8150RPM but never faster than 38mph.
What am I missing here? Shouldn't the rpms have gone down and speed up? Assuming the stock prop was a 13/18.
Any ideas why? Maybe the prop isn't fitting the way it needs or I used the wrong prop? Just curious.
Plan to add external cooler, injectors and bigger wheel this winter.