www.iFourWinns.com

Are there any small, bolt-on performance upgrades for a Merc 350 Mag ECT to boost horsepower, torque, and/or fuel economy?

For example, a K&N air arrestor, programmer, etc? Just looking for simple, cheap, stuff. I don't expect any siginificant gains, just wondering.

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2013 Four Winns H230, Merc 350 Mag B3, "For the Winn"
2011 GMC Sierra Denali 2500HD, "DirtyMax"

GM set those engines up really well with can/head/intake. There's nothing easy you could do worth the effort.

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1981 Columbia 8.7
2015 Yamaha FZR - 87mph - sold
2006 Yamaha GP1300R - sold
2003 Chaparral 215 SSI - sold
2009 Stingray 195CS - sold
2000 Four Winns H180 - sold
1976 O'day Daysailer II - sold
Rick's Four Winns H180 Mods/Upgrade Thread

As they say, with boats there's no replacement for displacement. There's only so much a 350 can do. To get more torque you definitely have to look at a larger engine.

It's not like you can depend on the same tricks that work in cars.

That and anything you do that increases power WILL increase fuel consumption. In which case you'd just be increasing the amount of drag from the water on the hull, further increasing fuel consumption.

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-Bill Kearney, 2005 348 Vista

An upgrade should be in the works pretty soon for the Mercruiser 350 mag ECT @ Whipple superchargers.

In development for some time, the new Whipple Industries supercharger kits for out-of-warranty, 430-hp MerCruiser 8.2L Mag HO ECT engines should be ready next week. That’s the word from Dustin Whipple of the Fresno, Calif., supercharger and supercharger kit outfit.

With a 3.3-liter Whipple supercharger and other kit-supplied accessories including a new intake manifold, the 8.2L engine should produce approximately 600 hp, according to Whipple. Buyers of the kit will need to ship their stock electronic control units to Whipple for reprogramming.

The Whipple kit reportedly will boost the power of the stock 8.2 Mag HO ECT (shown here) from 430 hp to 600 hp.
“This kit has been a work in progress,” Whipple said. “But we’re almost finished with it.”

After Whipple’s work on the 8.2L upgrade package is complete, the company will focus on completing its kit for the popular MerCruiser 350 Magnum ECT small-block engine.

“We wanted to finish the 8.2 kit first because that’s more of our core customer,” Whipple said.

With a 2.3-liter blower and the other Whipple-supplied accessories, the kit will boost the 5.7-liter engine’s output from 300 hp to approximately 465 hp. As with the kit for the larger-displacement engine, buyers for the 350 Mag ECT package will have to send their ECUs to Whipple for recalibration.

Retail cost for the 8.2L kit will be $7,000 to $8,000. The kit for the 350 Magnum kit will retail for $6,000 to $7,000. (Final pricing has yet to be determined.)

http://speedonthewater.com/new-boats-en ... gines.html

http://www.whipplesuperchargers.com/products.asp