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Shah Mat

01-15-2007 10:27 AM

575's..... 89 Octane?

I heard that the computers can be reprogramed so you can run 89 safely in a 575. Long trips it can be a real pain to get 93 sometimes.

True? Anyone?

Cattitude

01-15-2007 12:12 PM

Re: 575's..... 89 Octane?

Book says 91 min for that engine (I had one, still have the book), I can imagine you could detune it (Dustin Whipple or ASM) but if you have 93 in it and spash some 89 you might be fine..... 50 gallons of each gives you 91. You could run a scan tool to verify if your knock sensor is kicking in- I bet Merc has the factory timing setup with some margin....

vandy021

01-15-2007 12:28 PM

Re: 575's..... 89 Octane?

Our 575's ran like crap on 89.

sakoutis3

01-16-2007 08:53 AM

Re: 575's..... 89 Octane?

Kep the RPM's down and stay out of boost you should be al right. I've put it in my boat in a pinch and never had a problem. But I always top it off with the 93 as soon as I can get it.

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