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Procharged 272 w 502 mpi info

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Old 07-31-2017, 09:55 PM
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Default Procharged 272 w 502 mpi info

Returned my 2000 272 to somewhat stock.last year and sold it, freshened original 502 mpi, hand ported/touched up a set of 088 heads, reused my highly modified 502mpi intake,put in a 500efi cam. With extensive tuning was able to make 560hp on my dyno with 2 1/4 dyno headers, prob more like 530 once installed in boat with gil manifolds. Boat (272) ran 62ish for the short time it was stock back in 2000, 63/64 on fumes. Ran 69-70 ish with fresh, slightly modied 502 on fumes na w 24 labbed, 68 loaded down with non labbed 24. New owner who is a friend and customer of mine came back this year and wanted a procharger. We just installed a m-3sc w 4.5" upper pulley, makes 6 to 6.5lbs boost at 5700. Tuned boat on water for him, seeing 79 gps now at 5700 with labbed 26 pitch merc 4 blade, full tank of gas, 3 passengers, might tweak tune a tiny bit more and see 80 gps . Thought I'd throw this up here for the guys who wonder what numbers a 272 runs procharged. Owners already talking about bigger injectors and a 4.25 pulley. 46 lb injectors are about maxed out at this power level. Left big oil cooler, lines, big fuel pump, regulator, longer trim tabs, hyd steering on boat so its well suited to these mods, Smitty
Felt good to drive this boat again supercharged!
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Last edited by articfriends; 07-31-2017 at 10:43 PM.
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Old 08-01-2017, 10:23 AM
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Did you ever do any work on the hull bottom or 'is it stock.
I have the interior out of mine and I'm thinking of slapping in the 540 for a little fun
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Old 08-01-2017, 12:41 PM
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Thanks for the info, Smitty. I pretty much take your word as gospel around here.

Any reason you chose a pro charger over something like a 240 roots blower? My guess would be that you don't need the lower end torque of a roots on a light hulll?
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Old 08-01-2017, 09:51 PM
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I got a good deal on a used m3sc for customer, boat still had innercooler overboard hose and fitting plus i still had a custom.aw504 innercooler bracket and other pieces laying around so it was a easy install plus its still fuel injected so it doesnt have all the driveability issues a carbed boat has. Also gets 3+mpg cruising at 4000 which he would probably lose w a carbed roots blower
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Old 08-05-2017, 10:54 AM
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What does he run for outdrive and steering? 79 is pretty healthy.
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Old 08-07-2017, 11:44 AM
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Originally Posted by puzzleboy View Post
What does he run for outdrive and steering? 79 is pretty healthy.
twin ram full hyd steering to helm, 24" homemade stainless trim tabs, i built a stock 2000 style drive w new brgs when i sold him the boat, he will break floor out of the gears though or shear off a shaft eventually. I will be upgrading drive for customer this winter if it makes it that long.
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Old 08-07-2017, 12:31 PM
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What are you upgrading the drive to?
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Old 08-08-2017, 06:54 AM
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I had max worx drive on boat when I owned it but I also had over a thousand horsepower. Back years ago when I had a lot less horsepower in it I ran the stop 2000 drive for a couple years at about the horse power level it's at now or slightly less made it didn't break until I turned up the Boost and tried to run a 28 pitch then I sure the floor out of the early style gears. I will probably just upgrade the drive for him with late style thick floor gears and see what happens but if he breaks it first to destroy something else I will just have him buy a new XR Drive
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Old 08-08-2017, 02:56 PM
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That's great info and a huge help in understanding what I can get away with. I've been debating on putting a 240 roots blower to take 500 to 650ish, but wondering if I'd have to reinvent the boat to do so.
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Old 08-18-2017, 06:15 PM
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Smitty, what tank pick up/fuel line did you use to feed your beast?
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