Questions about a 2005 575SCI

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11-10-2012 | 09:10 AM

#11

Here's Johnny

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From: Manhasset, NY

Quote:

Originally Posted by kjm5125

They run fine on 89 octane.

is that true ? I've never heard that or tried that with mine.... heard that it could lead to problems.......

11-10-2012 | 11:32 AM

#12

keegan

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From: TRL

Mine is tuned for 91. Flame arrestor and manual says 92 octane or something I think. Not sure about 89 unless you left the blower belt off. LOL

11-10-2012 | 01:38 PM

#13

mcprodesign

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From: San Diego

W a supercharger the worst thing is detonation. The higher the octane the lesser the detonation.

Has anyone taken a stock 575 and added 9-10 pounds of boost? If so , What was the result? What HP did it make

11-10-2012 | 03:59 PM

#14

C_Spray

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Joined: Oct 2000

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From: Coastal North Carolina

There are a few Ron Potter-coverted engines out there making about 700. Tom A. on this board is a very satisfied customer. In stock condition, they are not the most trouble-free package as others have noted.

Keegan - My Volvo Penta's (540ci/600hp) sound just fine....

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Retired! Boating full-time now.

11-10-2012 | 06:30 PM

#15

mcprodesign

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From: San Diego

Quote:

Originally Posted by C_Spray

They make that kind of power stock, with chillers and 6 pounds of boost

11-10-2012 | 08:20 PM

#16

kjm5125

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Joined: Feb 2006

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From: Sandusky/Olmsted Falls, OH

Quote:

Originally Posted by Here's Johnny

is that true ? I've never heard that or tried that with mine.... heard that it could lead to problems.......

That is what I have been running for years and never a detonation problem.

11-10-2012 | 09:17 PM

#17

Boater8987

Airking

Joined: Aug 2004

Posts: 452

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From: Stafford Va.

I had 575SCI's in my Spectre before repowering with 600SCI's this year. They were the best set of motors I have owned so far in my 30+yr boating career.

11-10-2012 | 10:14 PM

#18

keegan

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From: TRL

Quote:

Originally Posted by Boater8987

I had 575SCI's in my Spectre before repowering with 600SCI's this year. They were the best set of motors I have owned so far in my 30+yr boating career.

What was your reason for going with the 600s? just curious. Guessing you went after the whipple upgrades and wanted more than 700hp?

11-10-2012 | 10:35 PM

#19

THEJOKER

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From: Lake Lanier - N. Georgia

Quote:

Originally Posted by keegan

i love my 575s. Send the blowers off to be safe and have checked at least, if not rebuilt. Change the head gaskets asap!

I would rather have a noisy blower, than have my boat sound like a volvo penta, but that is just me. I love the blower whine on mine.

They can handle 700hp all day if set up correctly. I was skeptical buying them, but now that mine are tuned correctly, they run like a full efi set up!

525s are great engines also. The 575s have more potential if you want more power out of them. Stock for stock i would go with the 525s.