Yamaha ECU

[rhardwick]

I have a 2013 Yamaha VF225 SHO. I've heard and read where the ECU is the only difference between a VF225 and a VF250.

Has anyone on here made this change and what results did you see?

I see VF250 ECU's on eBay for around $550.00 used. I'd rather not have mine re flashed and keep it stock.

Thanks in advance.

[David - WI]

It looks like with the NIZPRO DIY kits... you could flash it back to your (saved) stock tune if you wanted to? Costs about $1,000 more but gets you 82 more horsepower,

https://nizpromarine.com/shop/vf250-sho-4-2l-v6-332ho-diy-kit-2009-to-2021/

[Greg G]

Agree, send a note to Nizpro.

They will give you info and also tell you if there is a servicing dealer in your general area. They have a great track record.

[rhardwick]

Thanks for the info, I did not think about Nizpro

[David - WI]

They are on here... https://www.screamandfly.com/showthread.php?372865-Nizpro-Marine-Thanks-Scream-and-Fly-for-having-us&highlight=Nizpro

[pcrussell50]

I have a 2013 Yamaha VF225 SHO. I've heard and read where the ECU is the only difference between a VF225 and a VF250.

Has anyone on here made this change and what results did you see?

I see VF250 ECU's on eBay for around $550.00 used. I'd rather not have mine re flashed and keep it stock.

Thanks in advance.

I haven't got a specific answer for you... But when it comes to horsepower "locked up" in a chip/tune/ECU, I like to think of it in reverse...

In the case of the lower power ECU, what are the possible ways that it could be locking you out of your horsepower? Fuel? Timing? Rev limits? I'm going to guess timing, probably just small tweaks, and in cases like this, I'm willing to bet that the two motors will feel almost identical, in almost all realms of driving, except some thin peak at the top of the rpm range. IOW, in day to day recreational boating, with the occasional full throttle blast, you probably couldn't tell one from the other, I'd guess. This should not deter you from your learning experience though.

If you really want to be satisfied, maybe take some full power speed runs on a calm day, before and after. If you can consistently get one or two extra mph out of the "more powerful" ECU, then you have your answer.

Don't forget to share with us what you find, if you do this. ;)

-Peter

[David - WI]

The Nizpro kit would get him ~50% more horsepower and better fuel economy at the same time... he would "notice" it! :D

[aj06bolt12r]

I haven't got a specific answer for you... But when it comes to horsepower "locked up" in a chip/tune/ECU, I like to think of it in reverse...

In the case of the lower power ECU, what are the possible ways that it could be locking you out of your horsepower? Fuel? Timing? Rev limits? I'm going to guess timing, probably just small tweaks, and in cases like this, I'm willing to bet that the two motors will feel almost identical, in almost all realms of driving, except some thin peak at the top of the rpm range. IOW, in day to day recreational boating, with the occasional full throttle blast, you probably couldn't tell one from the other, I'd guess. This should not deter you from your learning experience though.

If you really want to be satisfied, maybe take some full power speed runs on a calm day, before and after. If you can consistently get one or two extra mph out of the "more powerful" ECU, then you have your answer.

Don't forget to share with us what you find, if you do this. ;)

-Peter
My buddy had a 200 SHO. We hooked it up to the scan tool and monitored throttle position one time.. Coming out of the hole the PCM gave it 100% throttle but at the max RPM the boat will turn it was only reading about 60% throttle opening or so.. It might be as simple as the PCM only allowing enough throttle position to make the advertised HP at a given load and RPM.

[pcrussell50]

My buddy had a 200 SHO. We hooked it up to the scan tool and monitored throttle position one time.. Coming out of the hole the PCM gave it 100% throttle but at the max RPM the boat will turn it was only reading about 60% throttle opening or so.. It might be as simple as the PCM only allowing enough throttle position to make the advertised HP at a given load and RPM.

Good point. I hadn’t considered the possibility of drive-by-wire throttling. Likes given.

-Peter

[rhardwick]

I'm sure the difference is timing and fuel delivery. If the VF200-VF300 are the same engines, the ECU's have different part numbers.

Some how there there is 100hp difference between the 200 and 300. I have not checked fuel injector part numbers, I would think they are the same.

The Nizpro claim of a 82hp gain is attractive.

I'll have to save up more "mad" money and get one!

[David - WI]

I'm sure the difference is timing and fuel delivery. If the VF200-VF300 are the same engines, the ECU's have different part numbers.

Some how there there is 100hp difference between the 200 and 300. I have not checked fuel injector part numbers, I would think they are the same.

The Nizpro claim of a 82hp gain is attractive.

I'll have to save up more "mad" money and get one!

That would actually be 82hp more than switching to the 225 ECU... 132hp gain for you. :D

[rhardwick]

That would actually be 82hp more than switching to the 225 ECU... 132hp gain for you. :D

I have a VF225. I was referring to Yamaha VF200, VF225, VF250 are the same engine with different ECU part numbers. Mine would be a 107HP gain.