My 525 builds
05-08-2018 | 02:53 PM
#11
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From: Midwest & T-Rock
That's pretty big jump in injector size. Do you remember fuel pressure you where running? I know if fuel system is up to it and fuel maps pulse widths ect you can flow a lot more fuel then the 43lbs that mercury markets injectors at 42ish psi. I originally did not want to spend the money and time to dyno but glad I did now. I did weld AFR gauges in tail pipes so should know if anything changes when we get them into the boat.
05-08-2018 | 03:57 PM
#12
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Joined: Feb 2006
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From: Manitowoc, WI
f-2 did you have throttle blades changed and intake throat opened up? 5700 is singing pretty fast restrictive intake and 540ci . Tyler figured my peak would be around 5400rpm. The main thing is that that they stay together! 
05-09-2018 | 12:37 PM
#13
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From: Manitowoc, WI
Little update. The fuel pressure compensation was left turned on in computers so could not adjust fuel pressure to make a full pull. Over nighting computers back to Tyler to get turned off and will try again hopefully end of the week....
05-13-2018 | 03:29 PM
#18
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From: Manitowoc, WI
Like I have heard over and over again mercury intake is out of air at 600 plus hp but I wanted it all mercury and am satisfied with outcome. If where dyno’ed with dry headers and no accessories like most shops would have been 20plus HP more. The torque curve is strong and should run campairable to 600sci and being naturally aspirated which is easier on motors in long run. Now will see how they push my 42 executioner. It ran 80 most days seen 84 once perfect conditions with 525s so real test is coming....
05-13-2018 | 04:43 PM
#19
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Joined: May 2012
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From: Midwest & T-Rock
my TB's were stock.........now that I think about it, the rev limit was set at 5700 peak hp was 5500...........
05-14-2018 | 01:27 AM
#20
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Joined: Oct 2000
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From: Omaha/LOTO
Like I have heard over and over again mercury intake is out of air at 600 plus hp but I wanted it all mercury and am satisfied with outcome. If where dyno’ed with dry headers and no accessories like most shops would have been 20plus HP more. The torque curve is strong and should run campairable to 600sci and being naturally aspirated which is easier on motors in long run. Now will see how they push my 42 executioner. It ran 80 most days seen 84 once perfect conditions with 525s so real test is coming....
