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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Rpm issue ideas.... I'm lost.... (https://www.offshoreonly.com/forums/general-q/340112-rpm-issue-ideas-im-lost.html)

SB 08-14-2016 01:49 PM
You promise ? LOL. Joking. Have fun out there.

Full Force 08-14-2016 02:16 PM
I think so I ran the boat pretty much wide open for the 5 mile ride back to the docK and everything was identical and looked really good I could probably clean it out a little more but I'm not going to just yet I kept the rpm 51-5400 the whole time... I ran the boat really hard all weekend long I cannot believe I did not take out a outdrive

Full Force 08-14-2016 02:20 PM
It's really been crazy but Joe and I have a lot of thought into this and it was really starting to think about the extra load issue

getrdunn 08-14-2016 04:25 PM
Glad your getting some things worked out.

phragle 08-14-2016 04:41 PM
So than in the real world a standard (if you can call it that) load is greater than the load put on by dyno testing?

Sorry If I am asking stupid questions, I just want all the ammunition possible to make a 550 hp 454 thats bulletproof. Its 35 miles from here to the bay and a little further to Kelly's. if its nice I want to be able to lay it on the dash without reservation or hesitation for the entire trip.

getrdunn 08-14-2016 05:10 PM
Originally Posted by phragle (Post 4470868)
So than in the real world a standard (if you can call it that) load is greater than the load put on by dyno testing?

Sorry If I am asking stupid questions, I just want all the ammunition possible to make a 550 hp 454 thats bulletproof. Its 35 miles from here to the bay and a little further to Kelly's. if its nice I want to be able to lay it on the dash without reservation or hesitation for the entire trip.
Kinda hard to believe when you here those things grunt on the dyno right... That's why tuning for your app in its actually environment is always the ultimate. Dyno's are great for a few things. 1) to make sure your chit don't grenade before marinizing and back in boat. 2) gives you a decent starting point with AFR's and EGT's. 3) bragging rights. Lol.

getrdunn 08-14-2016 05:31 PM
Originally Posted by Full Force (Post 4470819)
Ok after pulling my hair out thinking again, I called Mild Thunder Joe... We decided it's most likely the extra load on bigger props, making the one emgine go rich and lug, took out 3 jet sizes in secondaries and see 11.6-11.9:1 and both engines 5400 equal, so guess I just needed even less jetting then before the small props allowed the engines to run easier...

I can't say how great of idea it is to have full time widebands to check this stuff! I think we got this now!
This does seem odd with jetting down from extra load actually balanced it out. Is it possible that one was seeing less of a load so you were able to come down a couple sizes. It just seems more load = more fuel. But yet your AFR's are near the same? Just curious on your thoughts but regardless it's working.

Full Force 08-14-2016 06:17 PM
I would say grabbing a wideband in the boat is the best possible thing you can do for safe to because what happens on the Dyno vs the boat are two different things
Originally Posted by phragle (Post 4470868)
So than in the real world a standard (if you can call it that) load is greater than the load put on by dyno testing?

Sorry If I am asking stupid questions, I just want all the ammunition possible to make a 550 hp 454 thats bulletproof. Its 35 miles from here to the bay and a little further to Kelly's. if its nice I want to be able to lay it on the dash without reservation or hesitation for the entire trip.

getrdunn 08-14-2016 06:52 PM
Originally Posted by Full Force (Post 4470888)
I would say grabbing a wideband in the boat is the best possible thing you can do for safe to because what happens on the Dyno vs the boat are two different things
Did you start with wideband just on the one side and then recently install on both. Cmi has my tails right making some adjustments to accommodate my installs and had them install bungs in both while there. What a great inexpensive tuning device. Good insurance policy also. More time on the water with less time checking plugs.

Full Force 08-14-2016 07:19 PM
I have one sensor on each engine I love it


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