Sent 05 Ex to RF Powerboats
04-09-2012 | 12:14 PM
#731
Registered
Joined: Jan 2004
Posts: 4,480
Likes: 43
From: Tennessee
Here's a few more pics.
I'm drilling and tapping the 2 additional head bolts holes in the heads. These 2 bolts go through the lifter valley and into the bottom of the heads. That adds a 6th bolt hole to those 2 cylinders.
Eddie
I'm drilling and tapping the 2 additional head bolts holes in the heads. These 2 bolts go through the lifter valley and into the bottom of the heads. That adds a 6th bolt hole to those 2 cylinders.
Eddie
04-09-2012 | 01:41 PM
#733
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Joined: Jun 2009
Posts: 339
Likes: 0
From: League City, Tx
ASk away. THere are only a few things that I won't divulge. We are using a Mefi 4B ecm. My software is from GM.
I find it much better to tune the engine on the dyno. We can put it through every possible scenerio and load imaginable. I'll start at 2000 rpm with no load. We will maintain 2000 rpm as the load increases until we are at wot at 2000 rpm. That allows us to sweep all the way through the entire throttle range and check the tune. We will then go up about 200-300 rpm and do it again. We'll do that through the entire rpm range of the engine. That is something you can't do in the boat. Usually the only thing that changes from dyno to boat is idle,in and out of gear and throttle tip in. Those items are easily tweaked in the boat.
When tuning in the boat, you can only tune where the boat can load the engine. You can't sweep like we do. That load can change day to day based on the amount of people, fuel, gear, etc. You could tune it one day under one condition and then it be off on another day under different conditions.
Hope that helps explain it a little.
Eddie
I find it much better to tune the engine on the dyno. We can put it through every possible scenerio and load imaginable. I'll start at 2000 rpm with no load. We will maintain 2000 rpm as the load increases until we are at wot at 2000 rpm. That allows us to sweep all the way through the entire throttle range and check the tune. We will then go up about 200-300 rpm and do it again. We'll do that through the entire rpm range of the engine. That is something you can't do in the boat. Usually the only thing that changes from dyno to boat is idle,in and out of gear and throttle tip in. Those items are easily tweaked in the boat.
When tuning in the boat, you can only tune where the boat can load the engine. You can't sweep like we do. That load can change day to day based on the amount of people, fuel, gear, etc. You could tune it one day under one condition and then it be off on another day under different conditions.
Hope that helps explain it a little.
Eddie
04-09-2012 | 06:25 PM
#736
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Joined: Jan 2004
Posts: 4,480
Likes: 43
From: Tennessee
04-09-2012 | 09:19 PM
#738
Thread Starter
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Joined: May 2007
Posts: 1,351
Likes: 0
From: KC, MO
