XR550 g23

[ironj32]

After thinking about it, it's not as bad for those who got the XS before the pricing started to really go up.

Here is the total MSRP cost for the XS550 over the last year.
April 2012: $130,798
Summer 2012: $131,606
Winter 2012 / Jan 2013: $133,761
Now: XS - $133,761 (assumes base price stayed the same)
Now: XR - $127,553 (assumes base price stayed the same)

People who bought in April 2012 are out $3245
People who bought before the end of January 2013 are out $4053
People who bought Feb 2013-Now would be out $6208

So yea, if you got in at pricing before winter of 2012, it might not be as bad as it seems.

[Zach@n3]

I'm just curious as to why they call it a 1/2 system. To my knowledge the black/orange boat I posted the picture of was the first 550XR out of the factory. Everything looked the same other than paint and exhaust manifolds.

[newfoundskier]

When will this engine become available in the 200 Ski, 200 Sport, and 210? Time for that supercharged engine to go in something besides a G series boat or a 230.

[Zach@n3]

It won't. It would make even a 210 scary.

[Clax]

I would love to consider the XR550 option, but the premium fuel requirement just isn't practical for me. I keep the boat on the water in my boathouse all season, and unfortunately the marinas on our lake don't sell premium fuel.

[jsta281]

I would love to consider the XR550 option, but the premium fuel requirement just isn't practical for me. I keep the boat on the water in my boathouse all season, and unfortunately the marinas on our lake don't sell premium fuel.

http://www.planetnautique.com/vb3/sh...tane-quot-fuel


Not much added cost. If I wanted and could afford a G with a 550 hp motor, I would not let octane be the reason I bought something else.

[Zach@n3]

450 requires premium too so looks like you're stuck with a 409..

[ironj32]

You can definitely run the ZR450 on regular fuel. If you do that, however, you're not getting the extra horsepower that you paid for in the engine. I guess running the ZR450 on reg fuel gets you about 409hp.

[jsta281]

You can definitely run the ZR450 on regular fuel. If you do that, however, you're not getting the extra horsepower that you paid for in the engine. I guess running the ZR450 on reg fuel gets you about 409hp.

I'm not sure that's exactly how it works. At the very least I don't think that's how it's intended to work. What I mean is if the engine starts to experience knocking or pinging as a result of inadequate octane it will pull timing Which will in fact result in less horsepower. I personally wouldn't want to run fuel in my motor that if I knew would require the knock sensors to function properly in order to pull timing Before damage to the engine occurred.

[jsta281]

High-octane fuel in many factory tuned vehicles is a scam in the sense it's really not required. "Premium fuel recommended" in those cars does not mean that it requires premium fuel, For example, I think my wife's Kia says something about recommending premium fuel for best performance, that's total BS, UNLESS, your running it up on the limiter racing or Towing a heavy load, otherwise it's completely not necessary and does not aid in performance or economy whatsoever.

However in tow boat application where WOT is a regular occurrence and and heavy loads a given I would not run less then the recommended octane at anything near sea level. In SLC or Denver you would be safer but still not recommended.

[nyryan2001]

Iron- could you notice a difference in 450 performance between regular and premium fuels?

[Clax]

450 requires premium too so looks like you're stuck with a 409..

No it doesn't.

[perry386]

No it doesn't.

If you don't run the 450 with premium fuel then you get reduced to 409 HP. The 450 doesn't necessarily HAVE to have premium fuel to run, however, if you don't use it then you should have saved a couple grand and went with the 409.

[Clax]

If you don't run the 450 with premium fuel then you get reduced to 409 HP. The 450 doesn't necessarily HAVE to have premium fuel to run, however, if you don't use it then you should have saved a couple grand and went with the 409.

I have heard that stated a number of times on this site, and with all due respect, I don't believe this is accurate. Does anyone have any test data to reference? I have dabbled with some experiments in the past that have shown octane has a very insignificant effect, unless the timing and/or compression requires high octane. I previously owned a Formula 353 Fastech with twin 500efi Mercury engines. My father had the exact same boat, identical (except for a different paint scheme). We decided to do a little test, and ran one of them with 89 octane (his boat), and my boat with 93 octane. Ran them side-by-side. Absolutely dead even right from the start, and all the way up to 82 mph. In our case, there was no perceptible difference. That said, if the engine was forced induction, and required high octane to run properly, then perhaps there would have been a difference. If anyone has any info to support the ZR450 operating at 409hp with 89 octane, I'd be interested in hearing it.

[Zach@n3]

PCM manual states for optimum performance and reliability on a 450 93 octane premium fuel is required. You run whatever fuel you want in your boat. Every PCM engine has knock sensors. It can and will pull timing if it senses pre detonation. (that's why it's there......)

Why would you care about saving 15 bucks per tank in a boat if you were trolling around in a 150k G boat? I'm sure PCM would laugh at you if you had a warrany claim and the fuel in the tank on a 450 was tested as 87.

Order a 409.