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Old 18 November 2010, 06:27   #1
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WANTED 115hp mercury/mariner optimax ecu

Looking for a 115hp merc/mariner optimax ecu needs to be in working order.
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Old 18 November 2010, 06:51   #2
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presume you are trying to upgrade a 75 or 90?

If so, if you get one, i'm sure a few on here would be interested to see if there are any other parts that need changing and how you get on.

I was told when purchasing a v6, the ecu was the only difference.

Same for the 135 150 175 V6 range.
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Old 18 November 2010, 08:14   #3
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I was told when purchasing a v6, the ecu was the only difference.

Same for the 135 150 175 V6 range.
175 has a different block to the 135/150 Opti.
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Old 18 November 2010, 08:20   #4
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175 has a different block to the 135/150 Opti.
I have one!


Give me a call or PM. Its brand new in box.

01503 265898
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Old 18 November 2010, 09:26   #5
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TurboDiesel - sorry, it's leeway in the OP who is after an ECU and wants one for a 115

DHD - RE the 135, 150 and 175 block, it is my understanding they are all the 2.5L V6 engine. Or do you mean three is a slight difference in the block, perhaps bored out or something as well as a different ECU? I'm curious now. The 175 was always priced a lot higher than the 150.

Or do you mean at present the only 175 is the four stroke? obviously different. As shown below.

http://www.mercurymarine.com/engines/outboards/

The 200 and 225 etc were a 3.0L block, different again.
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Old 18 November 2010, 10:01   #6
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DHD - RE the 135, 150 and 175 block, it is my understanding they are all the 2.5L V6 engine. Or do you mean three is a slight difference in the block, perhaps bored out or something as well as a different ECU? I'm curious now. The 175 was always priced a lot higher than the 150.
The 135, 150 & 175 are all 2.5 litre V6 blocks, but the 175 is physically different (I'm not sure to what degree), so it isn't simply a matter of changing the ECU to convert a 135/150 to 175hp. I'm not sure what, if any, hp increase would be achieved by fitting a 175 ECU to a 135 or 150 Opti. If you lob your ECU in the post to me, I could give it a few test runs on the river to find out?

AFAIK, upgrading a 135 Opti to 150hp only involves an ECU swap, but the 135 lower unit has a different ratio to the 150, not that this has any bearing on horsepower.
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Old 18 November 2010, 14:36   #7
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presume you are trying to upgrade a 75 or 90?

If so, if you get one, i'm sure a few on here would be interested to see if there are any other parts that need changing and how you get on.

I was told when purchasing a v6, the ecu was the only difference.

Same for the 135 150 175 V6 range.
no not upgrading, i have a swamped 115hp and most of the electrics died. i know there are differances between 75/90/115 but dont know all the ins and outs sorry!
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Old 18 November 2010, 14:43   #8
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I have one!


Give me a call or PM. Its brand new in box.

01503 265898
I will give you a ring tomorrow as just seen your message and its late
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Old 18 November 2010, 14:52   #9
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i have a swamped 115hp and most of the electrics died.
Just a Splash or totally sunk?
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Old 18 November 2010, 15:04   #10
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Just a Splash
yew shudunt yewse de 'S' werd yew norty leprecorn

gow an doo sum rivverdansin orr sumfink

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or totally sunk?
mynor problum

transum fel orf.
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