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Old 23-12-2015, 07:53 PM   #1
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Merc 525 servicing/ tuning

I have a merc 525efi, can any one recommend a good reliable company to do some work on it on it please.
Thanks
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Old 28-12-2015, 05:12 PM   #2
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50 hr service. Do it yourself ! Plugs, Filters & Oil. Anglo American Oil Company, use 76 or Joe Gibbs for your oil. The ECU does all the parameter's so tuning is not required.
If she's got about 300 hrs on her, then you have a lot of parts that will be wearing out, so she will need a total overhaul to bring her back to her 540 ish mark, if she is a "real" Merc racing motor. They always quoted them low on BHP. Need to know to recommend.
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Old 29-12-2015, 02:30 AM   #3
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What is worn out by 300hrs out of interest?
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Old 29-12-2015, 06:23 AM   #4
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Quote:
Originally Posted by Drag Racer View Post
They always quoted them low on BHP.
The 502 geek in me loves these sort of statements. Did you mean the ECM had a relatively easy map to produce the quoted 500hp?

And in what way does a 540 reference apply to this motor at all?
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Old 29-12-2015, 11:43 AM   #5
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Kerry, I would assume the 540 is in reference to the belief that the 525's where always rated (more marketed) by Merc on the conservative side. I believe that in reality, the first upgrade every owner did on a 525 once either out of warranty or just prior to going racing (lol) was to hace the ecus away for a remap!
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Old 29-12-2015, 12:19 PM   #6
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Indeed my caped friend.

And no amount of total overhaul is ever to going to restore something that was not there before all those parts got worn out.

ECM is mapped for an 'easy' 500hp. It is exactly what they were sold as not quoted low on BHP.

But for Ed's benefit the ECM gets a bit worn out (loses it's electrickery) after 300 hrs and should be sent to me for recharging at a very cheap rate.

Also if you have a cigarette lighter facility on the boat, for just 99.99 i can let you have a device that will ensure an additional 50hp whilst burning half as much fuel and an exhaust that surpasses even one of Tinkerbell's bottom burps for cleanliness.
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Old 29-12-2015, 12:54 PM   #7
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you silly old sod!
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Old 30-12-2015, 12:58 AM   #8
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quietly steps away slowly... lol

One day ,when I have a proper EFI powerd boat engine, one of the first things I'll do is chuck its ECU as far as I can and stick in a proper ECU like one of these: S6Plus – Syvecs

That's what you need on all these V8s not some the mercury junk
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