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Old 30 August 2004, 07:29   #1
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Can a 150 Optimax be upgraded to 200?

I was just wondering.... seeing as the 150 and 175 / 200 etc optimax's use the same block, does anyone know if a 150 can be upgraded horsepower wise to say 200? Possibly an ECU change or something? (Mariner in this case)

Any information would be gladly recieved as it has to be cheaper than buying a new engine...

Too much is never enough!
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Old 30 August 2004, 08:16   #2
TIM
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I dont think this is possible.......

As far as i am aware, the intake ports and exhaust port are different heights in the block, ie for 150-175-200 and to up the HP you would have to change this........ I dont think its a matter of rechiping or reprograming the fuel injection......

I am only 60% certain of this though ....
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Old 30 August 2004, 08:48   #3
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I must be your 40% then Tim... I am 99% sure it's just an ECU swap that's needed. I think they are nearly 3k though.

FYI as far as i remember it's the 135/150/175 that are the same, 2.5li v6 the bigger engines are 3litre and no amount of electronics can change that.
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Old 30 August 2004, 09:20   #4
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hmmm, 3K for 25 horse - barely worth it I suppose... I would suspect that it is just electronic and possibly the exhaust system too, at least I'm told that that was the case on the older Yams. I can't imagine the the cylinder casting would be any different for production cost reasons.
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Old 30 August 2004, 10:10   #5
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Quote:
Originally Posted by Daniel
I am 99% sure it's just an ECU swap that's needed

I must be your 1% Daniel. I'm 99.9% sure that the bore/stroke are different between the 150 and 200. I am 100% sure that the gear ratios are different.

I am only 25% sure what month it is.

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Old 30 August 2004, 10:31   #6
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200hp is different but the 175hp is the same - prob is just an ecu swap - many modern engine makers do this - especially on turbo diesels.

3k for an ECU is just daft - maybe someone does a reprog chip or else you could borrow a chip and read out the codes.

http://www.brucatosvs.com/

These people actually do upgraded adjustable ecu but not shure if for optimax yet!
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Old 30 August 2004, 13:01   #7
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Well if its just ECU then go for it ......

I am sure you can get someone in the states who has done this before... you could proably fine it on the web.... with fichts we can reprogram form a laptop , and can get the sofware from the web

The Piont I made about the ports.... the block and bore stroke are all the same ... but the difference is that the hieght of the intake and exit port a crutal in a 2 stroke ... 1mm makes a huge differance in the final HP of a engine........

So they might have the same blocks etc but suttle differences , are the key . this is why we are stuck with 75 instead of 115hp
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Old 30 August 2004, 13:07   #8
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You could well be right TIM - until we actually see some blueprints or someone takes them apart we will never know!
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Old 30 August 2004, 13:21   #9
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Having said that the optimax is based on the old 2.5 block - various different sleeves are available which contain the ports - on the old sleeves they were the same for the 150 - 175 and 200hp models.
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Old 30 August 2004, 13:42   #10
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I think the 135 / 150 / 175 all use the 2.5l block, but the 200 / 225 / 250 all use the 3l block.
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