Hp500efi Kit
Hp500efi Kit
12-19-2002, 01:52 PM
#3
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Save your cash...a "40 HP gain" just isn't true. Do you really think Merc would cork that motor with too small a throttle body when they could have tamed down the cam lobe profiles resulting in less warranty claims? I think you would be lucky to gain anything. The only thing that throttle body is good for is some higher flowing heads, more lift on the cam[if you would even want that]...as far as cam duration goes, that motor is pretty much maxed out for that F/I setup.
12-19-2002, 02:56 PM
#4
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Hey Tom,
I'm with 27 Fountain on this one, I don't think you will see much for your money from what I have heard.
I did however put their billet filter units on my 500's, and they really look GREAT.
Merry Christmas
Mark
I'm with 27 Fountain on this one, I don't think you will see much for your money from what I have heard.
I did however put their billet filter units on my 500's, and they really look GREAT.
Merry Christmas
Mark
12-19-2002, 08:25 PM
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DonziTom,
I have the setup installed on a 502/502 crate motor. In addition, I have Merlin heads, Gil headers, and 1.7 roller rockers. I have been having some problems. During the first couple of hours of break-in, I broke a rocker stud and bent two pushrods. The mechanic that did the setup was no longer available due to health reasons, so I took the boat into a Mercruise mechanic for the evaluation and repair. The first mechanic miscalculated the exhaust rod length - oops! - and re-installed the stock valve covers with a cheater double cork gasket - double o-u-c-h! The Mercruise mechanic completed the repairs and in the tune-up, I could not convince him that the base timing of 16 was by the book. He really wanted to revert to the stock setup of 8 - so its at 8. You probably think that I am rambling at this point, but the real just of the story is that right now I am probability running just a little under stock horsepower (mostly based on the way the boat performs). I am just like every other horsepower scrappy, I really like shopping for those bolt-on’s!
There was a very interesting recent thread about installing a reprogrammed ECM. The feedback that I am incline to agree with is that the finished product should be put on a dyno and tweaked. I believe that I would have saved money and certainly been happier with the results. The dyno probably would have popped the top end saving me that very embarrassing tow-in from the tooner (that’s Indianapolis performance slang for pontoon boat). I also would have heard the top end noise and seen the oil weep from the valve cover problem.
Andy
http://www.offshoreonly.com/forums/s...eferrerid=7189
I have the setup installed on a 502/502 crate motor. In addition, I have Merlin heads, Gil headers, and 1.7 roller rockers. I have been having some problems. During the first couple of hours of break-in, I broke a rocker stud and bent two pushrods. The mechanic that did the setup was no longer available due to health reasons, so I took the boat into a Mercruise mechanic for the evaluation and repair. The first mechanic miscalculated the exhaust rod length - oops! - and re-installed the stock valve covers with a cheater double cork gasket - double o-u-c-h! The Mercruise mechanic completed the repairs and in the tune-up, I could not convince him that the base timing of 16 was by the book. He really wanted to revert to the stock setup of 8 - so its at 8. You probably think that I am rambling at this point, but the real just of the story is that right now I am probability running just a little under stock horsepower (mostly based on the way the boat performs). I am just like every other horsepower scrappy, I really like shopping for those bolt-on’s!
There was a very interesting recent thread about installing a reprogrammed ECM. The feedback that I am incline to agree with is that the finished product should be put on a dyno and tweaked. I believe that I would have saved money and certainly been happier with the results. The dyno probably would have popped the top end saving me that very embarrassing tow-in from the tooner (that’s Indianapolis performance slang for pontoon boat). I also would have heard the top end noise and seen the oil weep from the valve cover problem.
Andy
http://www.offshoreonly.com/forums/s...eferrerid=7189
12-20-2002, 11:21 PM
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Shute DonziTom,
I don't want to talk you out of a idea. I just wanted you to think a little deeper on the subject. We all need to come up with a dream and pursue it. Just up the ante a little to make sure that it is right.
Andy
I don't want to talk you out of a idea. I just wanted you to think a little deeper on the subject. We all need to come up with a dream and pursue it. Just up the ante a little to make sure that it is right.
Andy
12-21-2002, 12:35 PM
#8
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I just installed these kit's on my 33' Daytona and was only out once with it. I could not open it up all the way yet because I am breaking in new lower gear sets on the drives. I will tell you that I have noticed a big difference so far in the midrange. Everyone say's the boat sounds totally different. I will post my results when I open it up, but I think so far it was a good move.
