Luke.H

No because I know how hungry boosted vehicles are. Granted it may be different on water. That's a whole different animal, tune, and drag, so I may be wrong, but with a vehicle, if you are into the boost, you are using up a lot of fuel. Keep in mind you are forcing air in and compressing it where as the NA can only suck air in. The more air you have, the more fuel you need, so the blower is always going to need more fuel and a lot more. I was summoned to bed about the time I read this, so you know what I thought about all night (well not the first 15 minutes). Went through a huge calculation to "verify" things this morning, but am missing some information to really prove anything out. I have some conclusions however. Currently my boat pulls: 5200rpm at 38mph using 32 gallons/hr 3420rpm at 25mph using 4 gallons/hr Conveniently it is easy to calculate the different fuel used as the ideal gas law is linear. PV=nRT so if we increase the pressure x% we increase our oxygen intake the same and therefore assuming we keep the same fuel to 02 ratio we are golden. That being said going all the way up to 10psi of boost yields 1.68x the gas at the same RPM. (24.696/14.696). Then the question becomes propulsion and can you pick a prop with the right pitch & diameter such that the rpm of the motor will change, but keep the boat speed the same. I am not a prop guy so I'll make the assumption that this is possible. I do know there are a crap ton of props and that mine has an extremely aggressive prop (14.25 pitch which means one revolution with no slip moves the boat forward 14.25inches - as a reference my bass boat has a 27p prop and tops out near 80 at nearly the same RPM's as the Malibu doing just under 40mph and has nearly double the pitch). The only other question is do you have the power to turn it? In order to get there, the boost comes into play. Here I eyeballed: http://www.powerblocktv.com/sites/bang4buck/0703/ and came up with a power table. From my table you can see that in current stock form my boat makes around 220hp at 3450rpm where I cruise at 25mph. Even if I only gain 30% from 10psi I would only need to be spinning 2950rpm with the right prop to maintain that speed. 25mph is where my hull is the most efficient. The spot that makes this near impossible to determine is knowing my current fuel consumption curve. I only have two points. 25mph at 4.5gal/hr and 38mph at 32gal/hr. Since that curve looks far from linear it is hard to tell what drives it. One thing is for sure though, with a 40% gain in power I should be making around 340hp at 3700rpm instead of 5200rpm. This should mean that I'd be an awful lot closer to the 4gph than the 32gph (and then of course we adjust by 1.68x) which seems to me that it'd be more efficient where I am using it. So that being said I do think I will see both a top end improvement and efficiency improvement through lowering the rpms while running at a real cruising speed. If I had more points on the actual consumption of my boat so I could determine a curve I could really dial this in including exactly how much boost to use for what prop and such...or so I think anyways. Holy Shit Sean! Your statement had me dream all night. Almost to the point where I was going to look to see where I could get a flowmeter for "demo" purposes to run on my gas line to really map out my usage. Obviously not worth that effort. Should just baseline and go from there. That would be really thorough, lol. Exactly my problem. I have a hard time not being. Of course part of this stems from the fact that this is the slowest boat I have ever owned. Good problem to have. Is the Bu really that slow? Those boats don't haul ass by any means but I've never felt an overwhelming urge to really open one up. It'll do around 35 won't it?

No because I know how hungry boosted vehicles are. Granted it may be different on water. That's a whole different animal, tune, and drag, so I may be wrong, but with a vehicle, if you are into the boost, you are using up a lot of fuel. Keep in mind you are forcing air in and compressing it where as the NA can only suck air in. The more air you have, the more fuel you need, so the blower is always going to need more fuel and a lot more. I was summoned to bed about the time I read this, so you know what I thought about all night (well not the first 15 minutes). Went through a huge calculation to "verify" things this morning, but am missing some information to really prove anything out. I have some conclusions however. Currently my boat pulls: 5200rpm at 38mph using 32 gallons/hr 3420rpm at 25mph using 4 gallons/hr Conveniently it is easy to calculate the different fuel used as the ideal gas law is linear. PV=nRT so if we increase the pressure x% we increase our oxygen intake the same and therefore assuming we keep the same fuel to 02 ratio we are golden. That being said going all the way up to 10psi of boost yields 1.68x the gas at the same RPM. (24.696/14.696). Then the question becomes propulsion and can you pick a prop with the right pitch & diameter such that the rpm of the motor will change, but keep the boat speed the same. I am not a prop guy so I'll make the assumption that this is possible. I do know there are a crap ton of props and that mine has an extremely aggressive prop (14.25 pitch which means one revolution with no slip moves the boat forward 14.25inches - as a reference my bass boat has a 27p prop and tops out near 80 at nearly the same RPM's as the Malibu doing just under 40mph and has nearly double the pitch). The only other question is do you have the power to turn it? In order to get there, the boost comes into play. Here I eyeballed: http://www.powerblocktv.com/sites/bang4buck/0703/ and came up with a power table. From my table you can see that in current stock form my boat makes around 220hp at 3450rpm where I cruise at 25mph. Even if I only gain 30% from 10psi I would only need to be spinning 2950rpm with the right prop to maintain that speed. 25mph is where my hull is the most efficient. The spot that makes this near impossible to determine is knowing my current fuel consumption curve. I only have two points. 25mph at 4.5gal/hr and 38mph at 32gal/hr. Since that curve looks far from linear it is hard to tell what drives it. One thing is for sure though, with a 40% gain in power I should be making around 340hp at 3700rpm instead of 5200rpm. This should mean that I'd be an awful lot closer to the 4gph than the 32gph (and then of course we adjust by 1.68x) which seems to me that it'd be more efficient where I am using it. So that being said I do think I will see both a top end improvement and efficiency improvement through lowering the rpms while running at a real cruising speed. If I had more points on the actual consumption of my boat so I could determine a curve I could really dial this in including exactly how much boost to use for what prop and such...or so I think anyways. Holy Shit Sean! Your statement had me dream all night. Almost to the point where I was going to look to see where I could get a flowmeter for "demo" purposes to run on my gas line to really map out my usage. Obviously not worth that effort. Should just baseline and go from there. That would be really thorough, lol.

First day back at school. Already wanting to skip

Man, the Bengals are really terrible

Sanding is a bitch, painting I don't mind so much. Of course, I've only done it once.

Speaking of the C30, too bad Volvo won't make the C30 Polestar. Thing looked absolutely badass

Indeed

Finished hooking up the new TV. Panasonic Viera

Any thoughts on the Western Digital TV media players? I wanted something to play movies etc onto my tv via a thumb drive or external hard drive. Similar to what I do with my PS3 on a different tv. I found one like this on CL for $60. Is there a better option I should be looking into?

Enzo would roll over in his grave

Good god that's ugly

As far as Cadillac concepts go I like the Sixteen. 13.5L V16 http://motorld.com/17426/top-gear-review-cadillac-sixteen

Ugly as hell if you ask me

Record a song? Like this

You're better off not knowing. Facebook is a serious pita It's not if you don't add every person that you've had contact in your life even for an hour and/or disable updates from people who post dumb shit there. I don't read that shit. Ever. I get on to answer the ridiculous PM's and pokes. If I don't people ask me why I'm being a dick. I think some people just take it too seriously

Personally, I'd sell the blower and keep it NA and maybe do some head and intake work. You can make the same amount of power and use less fuel, less pressure and strain on everything, etc. . . That is seriously the opposite of what I expected you to say. Also curious on the use less fuel, more power allows the same speed at a lower rpm (I get to change gearing, err props) which even with the parasitic load of the charger I would expect better fuel consumption. I do have funny goals here compared to a car. I need more power to turn a tall gear and still get on plane. Once on plane I don't really need the power and will let the engine run relaxed unless I am an idiot and seriously burning fuel (ie top speed) in which case it will definitely suck significantly more gas. Analogy of adding an overdrive at the driveshaft/putting a tall gear in to achieve a better highway cruise but building up your power so that you can still accelerate equally. I am just reverting back to my blower and turbo car experience. You always use more fuel with the cylinders pressurized. You have to. I know it may not be a concern to you, and might be the easy way with the blower, but I think for reliability's sake and savings, keeping it atmospheric will be best. You're going to be dealing with a cooler/denser air charge as well, so that will only help. I have always been under the assumption that low pressure forced induction allows better efficiency as less fuel is wasted. No?

You're better off not knowing. Facebook is a serious pita

Sorry, I am not into you that way. But there are a handful of us that chat on there via cell phone. Is that what that huddle business is? I've been invited to a few and have no clue what they are Yes. You've got to have a phone with the app on it to use it right? Because I clicked the link and it just takes me to the mobile site

Sorry, I am not into you that way. But there are a handful of us that chat on there via cell phone. Is that what that huddle business is? I've been invited to a few and have no clue what they are

I thought everyone gave up on me. I just haven't had anything worth posting. I'm not big on social networking, but I do think Google did a pretty nice job with it

I have it, but have only got on it a handful of times. I hate FB though so that sort of thing doesn't entertain me. I've seen a lot of people mention they can't wait for it to go public so I'm sure it'll catch on eventually.

Yeah, that's not what he has; it's a newer model. My bad. This was the 98-02 version. His is a 99, but they had nowhere near 500bhp. Maybe 350-400. Euro models may have been different. Well Jeremy Clarkson is full of shit I guess, lol. Series 1 so the show aired in 02. He was comparing it to the Audi RS6 which develops (according to him) 400hp. It was the 98-02 version in the show as well. Regardless, its a cool car

Yeah, that's not what he has; it's a newer model. My bad. This was the 98-02 version.

Watching an old episode of Top Gear and Clarkson's reviewing the E55 AMG. 500bhp. So pucking sick. God damn you Peng

Love the SE-R tails