Glad he touched on the HP comparison. I literally just swapped out old Suzuki 140's for new Suzuki 175's (fly-by-wire) on my 26' Twin Vee a few days ago. Still in the 10-hr break-in phase, but I already notice the improvement in fuel consumption.
I have a Nizpro tune on my 4.2. Went from 250hp to 332hp and love it. With the Yamaha all the 4.2 are exactly the same engine. Yamaha just de-tunes them mainly done with the fly by wire throttle. That means what your really doing is going from a 300 to 332hp engine which is really ownly 10% which is bugger all. All nizpro do is clean up the very rich map that Yamaha puts into it. So all those who stress about tuning engines and over stressing them. Your not. You just getting the power Yamaha has taken out of the motor. Watch the Nizpro Dyno vid on fullboost. Those guys are not back yarders.
I think they are safe, depending on what we are talking about tune wise. If you are tuning for speed and every inch of power you can get out of the engine, then not so much on longevity, but a simple tune to unlock the normal performance of the engine sure
Good stuff, thanks. I'm considering going from twins Yamaha 150hp to just one 250 or 300 hp on a 2000 Robalo Walkaround 2440 model. boat dry weight it's like 5200. I'm not sure, any advice? thanks
Tough question, first considerations are, what's wrong with the 150's and what's the cost to do the conversion? Then 2 examples, seen a 23' Seacraft go from a single 250 I believe to twin 140 Suzuki's and it rode better with the single. Also a 26' SeaVee go from twin 150's to a single 350 and it performed better with the twin 150's. I think the 2400 walkaround is going to be a heavier boat will perform fine with either the single or the twins, but I think performance and handling will be far better with the twins than the single.
As someone who has modified many personal vehicles over the years to get more horsepower and performance, I would highly suggest NOT doing this on a boat where reliability is paramount. If this is a lake boat or inshore only boat then I suppose no harm no foul. BUT, if you are planning on running offshore and absolutely MUST be able to make it back, I would not mess around with your ECU/ECM. Whenever you start "tuning" these things, there is always a very real chance that reliability diminishes.
I was under the impression that compression and head design were part of HP increase but looking at some manufacturer specs compression is constant across HPs in same block. Now I know😁
Absolutely. I think nismo works with yamaha and that may not void warranty but will need to be approved by dealership. I think how it works is you would loose your yamaha dealer warranty but nispro would pick you up on their warranty. Something like that. Not much information out there about it but thats what i have found
Depends on the manufacture and the warranty you are wanting to claim, most tuning will void your warranty. OEM's don't like people messing with their stuff, especially the computers, but not all warranty claims are the same. For example, if you tune your engine, and there is a problem with say the trim unit, completely unrelated to the engine and the tuning. A good dealer that is trying to take care of you will get the trim issue repaired under warranty no problem. A stickler dealer that doesn't really care about you, will deny doing the warranty because of the tuning. Warranty can get tricky depending on the issue and the dealer :/
Im sorry but this explanation made it Moore complicated … It Moore in to bsfc on an engine and how much torque it have. Not hp. And when it come to map an engine u hafe to map it exactly fore that boat.
Glad he touched on the HP comparison. I literally just swapped out old Suzuki 140's for new Suzuki 175's (fly-by-wire) on my 26' Twin Vee a few days ago. Still in the 10-hr break-in phase, but I already notice the improvement in fuel consumption.
I have a Nizpro tune on my 4.2. Went from 250hp to 332hp and love it.
With the Yamaha all the 4.2 are exactly the same engine. Yamaha just de-tunes them mainly done with the fly by wire throttle. That means what your really doing is going from a 300 to 332hp engine which is really ownly 10% which is bugger all. All nizpro do is clean up the very rich map that Yamaha puts into it.
So all those who stress about tuning engines and over stressing them. Your not. You just getting the power Yamaha has taken out of the motor.
Watch the Nizpro Dyno vid on fullboost. Those guys are not back yarders.
great topic , but are the new map on engine is safe for longevity? and is there any disadvantage?
I think they are safe, depending on what we are talking about tune wise. If you are tuning for speed and every inch of power you can get out of the engine, then not so much on longevity, but a simple tune to unlock the normal performance of the engine sure
Good stuff, thanks. I'm considering going from twins Yamaha 150hp to just one 250 or 300 hp on a 2000 Robalo Walkaround 2440 model. boat dry weight it's like 5200. I'm not sure, any advice? thanks
Tough question, first considerations are, what's wrong with the 150's and what's the cost to do the conversion? Then 2 examples, seen a 23' Seacraft go from a single 250 I believe to twin 140 Suzuki's and it rode better with the single. Also a 26' SeaVee go from twin 150's to a single 350 and it performed better with the twin 150's. I think the 2400 walkaround is going to be a heavier boat will perform fine with either the single or the twins, but I think performance and handling will be far better with the twins than the single.
As someone who has modified many personal vehicles over the years to get more horsepower and performance, I would highly suggest NOT doing this on a boat where reliability is paramount. If this is a lake boat or inshore only boat then I suppose no harm no foul. BUT, if you are planning on running offshore and absolutely MUST be able to make it back, I would not mess around with your ECU/ECM. Whenever you start "tuning" these things, there is always a very real chance that reliability diminishes.
100% agree. .
I was under the impression that compression and head design were part of HP increase but looking at some manufacturer specs compression is constant across HPs in same block. Now I know😁
Disagree. Only if you tuned it wrong and that would show it's face real early
Impacts to manufacturers warranty?
Absolutely. I think nismo works with yamaha and that may not void warranty but will need to be approved by dealership. I think how it works is you would loose your yamaha dealer warranty but nispro would pick you up on their warranty. Something like that. Not much information out there about it but thats what i have found
Depends on the manufacture and the warranty you are wanting to claim, most tuning will void your warranty. OEM's don't like people messing with their stuff, especially the computers, but not all warranty claims are the same. For example, if you tune your engine, and there is a problem with say the trim unit, completely unrelated to the engine and the tuning. A good dealer that is trying to take care of you will get the trim issue repaired under warranty no problem. A stickler dealer that doesn't really care about you, will deny doing the warranty because of the tuning. Warranty can get tricky depending on the issue and the dealer :/
Im sorry but this explanation made it Moore complicated …
It Moore in to bsfc on an engine and how much torque it have. Not hp.
And when it come to map an engine u hafe to map it exactly fore that boat.