Both Mercury and Yamaha dominate most aspects of the outboard game, and it’s easy to see why in this horsepower range, they simply hit most of the marks on weight, gearing, and features. The criteria is 135 to 200 HP.Īt the top of the pack are the 4 cylinder Mercury 150 ProXS and the 4 cylinder Yamaha Vmax SHO 150 and 175 HP. Let’s compare and look at what the best ones are. Some have low water pickup, some don’t, and most have gearing for pontoon boats unfortunately. Another reason is most are 4 cylinder four strokes, and they have similar dimensions to the older engines they often replace, whereas four strokes above 200 HP are often the size of a commercial refrigerator.īecause these outboards are primarily built for such a variety of boats, they are missing key performance ingredients. That’s why I love this category, they are bullet proof engines that can push light boats really well, and are affordable to buy and run.
#Yamaha sho ecu flash full
Many of these outboards are around $12,000 to $15,000 brand new, and the pre-owned market is full of great deals. For high performance, there really isn’t anything out of the box that really is a high performance engine per say, but there are some really good engines, and with minor modifications can be made into economical performers. The mid range horsepower range is an ultra competitive category in the boat world. “I will be upgrading mine in the very near future and watch the speed numbers improve even more because of it.Good things do come in small packages, at least in outboard engines. A stock ski only turns a measly 7300 RPM when the limiter kicks in… that is nothing! Add 1000, or 1500 more RPM and you better be upgrading the engine cooling and intercooler. “Keep in mind that the stock engine cooling and stock intercooler were designed for a stock ski.
In hot 95 degree summer air and 90 degree summer water these temps will climb at an alarmingly fast and dangerous rate. This means the stock cooling system and stock intercooler are not up to the task at these higher RPM levels. Despite cooler ambient temps, Dean’s logs show a steady climb in engine temp and a steady climb in air intake temps during a prolonged wide open throttle pull. Dean has similar numbers during his testing. It’s winter time, temps here yesterday during my testing were only 62 degrees and water temp in the 50’s. “Guys, while these preliminary numbers are extremely impressive without any other modifications, it will not be safe to run a ski like this continually without engine cooling and intercooler upgrades. “I just removed the spacer plates from between the ride plate and the hull and went back to the water and the ski hit 80.5 mph. Jerry went back a little bit later and updated the post with the following:
#Yamaha sho ecu flash mods
Now it’s time to let the mods begin and get some big numbers out of this beast.” It just goes to show you how good of a job Yamaha has done with this ski. “RPM’s were firmly planted at 8360-8380 RPM. So much for iPhone GPS app’s being inaccurate. I second guessed the accuracy of it and went straight to Wal-Mart to buy a Garmin and went straight back out to the water and BAM! 79.2 mph. “I was using an iPhone app called Max speed and initially saw 79.1 mph. Untouched impeller, stock supercharger, stock intercooler, stock everything! That’s right, this ski is completely stock with the exception of the reflashed ECU.
We have finally got it nailed down and my ski just hit 79-plus-mph with no other modifications whatsoever. “Guys, I’ve been working hard with V-Tech to develop a reflash that will work on the new SVHO ski. If you think the 80.5mph top speed is impressive, consider that it was at a very mild 8380RPM. Well, we hope that today’s news will help fix that:Īs of Friday afternoon, was able to break the 80-mile-per-hour line with their SVHO with no more than an ECU reflash and removing the spacer plates found between the ride plate and hull. We, and ’s Jerry Gaddis, assured that it was, but simply couldn’t convince everyone. We later caught some heat online from the doubting Thomases arguing that the SVHO really couldn’t be that much of an improvement over the previous SHO. I was debating whether it would be too snarky to begin with saying, “See, I told you so.” About a month ago, The Watercraft Journal had the chance to spend a couple of days with the much improved 2014 Yamaha FZR SVHO, where we claimed that it was “a performance-bred Yamaha that the likes of which no dealership showroom has seen since the GP1200R.”
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