2023 255xd Maptuner X tunes

FSH 210 Sport · Feb 22, 2024

jacoviii said:
"A 250hp vs 290hp at 7500 with the same impeller/pump setup will net no increase in speed. " But 290hp at 7500 will give you the ability to re-pitch and in turn can pick up top speed.
Yamaha just launched a 1.9ho 200hp and the stock wave runners picked up 4mph. So more HP and a different impeller then the 1.8. I know this was also talked about here during the Yamaha launch of the 1.9 in the boat there was some added speed on the top end on the 222.

"I still maintain that going the route @Wicked92 did to fine tune the impeller is the most effective way to improve performance at a given location, altitude, without sacrificing reliability / longevity / warranty."

"There will be a loss in mpg by going to a lower pitch impeller, my personal experience was a loss of .3-.5 mpg but it was well worth the gain in performance in my case, there’s always a trade off. If I was going to be running a lot of longer distances and fuel range was a concern I’d drop my oem impellers in and sacrifice some top end speed for up to 25 miles greater range."

@FSH 210 Sport You are worried about a completely different end results then we are looking for. You keep talking reliability / longevity / warranty/ 25 miles greater range.
We are talking more power more fun
These motors are more than capable of more HP and a bit more RPMs.

Wicked is @ sea level best case for hp and top speed. He has a set of the twin impellers that were pitched for best results and he lost top end speed. Can he get it back? maybe. Still waiting on this season testing.

@FSH 210 Sport Aren't you scratching every ich you can find to MOD your TR1's to gain maybe 4mph. I could literally copy and past all of your posts from this thread to "Tuning a TR1 - Riva Tuner" and poo poo on your journey.

Not trying to pop poo the 255XD journey. My intentions are true, I would be remiss if I did not share what I’ve learned with fellow members. And from what I see from map tuners dyno charts the SVHO motor won’t achieve the 35 hp increase in power unless the rev limiter is raised to 8300 rpm for a target of 8100 rpm, and that means lower pitch impellers thereby increasing the effective displacement.

The TR-1 project seeks to increase volumetric efficiency across the midrange and on up to the oem rev limiter, I think I was pretty specific about not wanting to raise the rev limiter. This would be using cams that open faster, open farther, stay open longer and close faster, and these cams are in between the stock TR-1 cams and the Viper variant used in the side by side, so nothing radical at all.

The 1.9L engine did several things to increase power, added 100cc of displacement, and increased volumetric efficiency, via longer intake runners, different cams etc.

As far as warranty goes, I’ve seen some other posts here where people did things and got their warranties cancelled and then they were not happy, so that’s my angle on the warranty thing. I’ll be waiting to see what the testing here in this thread comes up with.

dwakeman · Nov 12, 2024

FSH 210 Sport said:
Not trying to pop poo the 255XD journey. My intentions are true, I would be remiss if I did not share what I’ve learned with fellow members. And from what I see from map tuners dyno charts the SVHO motor won’t achieve the 35 hp increase in power unless the rev limiter is raised to 8300 rpm for a target of 8100 rpm, and that means lower pitch impellers thereby increasing the effective displacement.

The TR-1 project seeks to increase volumetric efficiency across the midrange and on up to the oem rev limiter, I think I was pretty specific about not wanting to raise the rev limiter. This would be using cams that open faster, open farther, stay open longer and close faster, and these cams are in between the stock TR-1 cams and the Viper variant used in the side by side, so nothing radical at all.

The 1.9L engine did several things to increase power, added 100cc of displacement, and increased volumetric efficiency, via longer intake runners, different cams etc.

As far as warranty goes, I’ve seen some other posts here where people did things and got their warranties cancelled and then they were not happy, so that’s my angle on the warranty thing. I’ll be waiting to see what the testing here in this thread comes up with.

See this forum. Seems somebody did use the Maptuner on a Yamaha boat and has confirmed what you’ve been saying.

Thread 'RIVA Maptuner X ECU Reflash: Throttle Response and Speed Control'

Nov 5, 2017

RIVA's Maptuner X is a blast. I have had the Maptuner 1 in the past, and there is just no comparison - as far as speed, and ease of use.

There is a ton of information on the system on greenhulk, albeit mostly concerning forced induction engines. Ordering through greenhulk store is the best way.
http://www.greenhulk.net/forums/showthread.php?t=246087
https://rivaracing.com/p-33822-maptunerx.html
https://www.4-tecperformance.com/index.php?main_page=index&cPath=180

RIVA Maptuner is supported by a team led by Jesus Garcia. He has a reputation as a master...

jsr418 · Nov 13, 2024

I tuned the boat before I winterized it and shrink wrapped it. I was hoping to get on it before the winter but unfortunately it didn’t happen. I’ll have more info for everyone in the spring.

jacoviii · Nov 16, 2024

jsr418 said:
I tuned the boat before I winterized it and shrink wrapped it. I was hoping to get on it before the winter but unfortunately it didn’t happen. I’ll have more info for everyone in the spring.

Same here my tunes are waiting till spring.
And dwakeman compering a NA tune to the benefits of a Tune on a motor that has force induction is silly.

Willm · Thursday at 6:27 PM

jsr418 said:
Hi all,

I’ve had skis forever but just purchased a leftover 255xd with the twin SVHO engines. The boat is gorgeous and I can’t wait to use it. I already have the maptuner x for my skis and was wondering if anyone has tested the stock tune which removes the speed limiter on the boats. I know it offers substantial gains on the skis. Just not sure how much you will get out of it with the heavier boat. I appreciate everyone’s input!

Jay

Hi Jay,

I’m not sure if this has been explained to you clearly by now. I ran across this post looking for information on map tuner tunes for the Yamaha boats for a friend of mine.

For some reason I can’t get all of these responses on this thread to load, so forgive me if this has already been clarified to you ad nauseam.

In case it hasn’t, here you go..

You seem to be only partially informed on how the Yamaha Waverunners are speed limited.

There are effectively two ways some models are limited to the supposed 67.5mph coast guard limit.

Firstly, all Yamaha SVHO waverunners are ECU limited to 7500-7700 RPM depending on the year and model. This is for reliability sake, as this RPM means the engine is only putting out about 85% effort of what the engine is capable of without needing modifications to certain engine components.

This RPM limit keeps the larger and heavier FX models right around the agreed 67.5mph limit. (Trim neutral, half tank of gas - and why they’ll really see 70-71 with trim up, and less gas in the tank).

However, the FZ and GP models still want to climb up to 70-72mph at these RPMs even with trim in neutral and half tank of gas. And even faster with trim up and less gas).
So, Yamaha secondly has a GPS limiter built into these skis, and as soon as the GPS sensor catches the ski hitting anything over 68mph, the limiter sends a signal to the ECU which dials back the engine RPM so the ski will dip under 68 again.
The FX does not have the GPS limiter.

The 2014-2016 FZ and 2017-2019 GP’s were extremely noticeable with how harsh the top speed fade off was.
You could actually feel the 3-4mph drop off after a second or two of running 70+mph. But if you pull back on the throttle down to 65 or so, you can hammer it, and get it back up to 70-72 for a couple seconds. There is a 2-3 second delay for the GPS to read the excess speed, send the signal, and the top speed drop off. The 2020+(I think) GP models still have the GPS limiter, but it’s a more gradual tapering of the RPM so the decline in speed isn’t really noticeable.

When you reflash these things, a few things are being changed.
1) The GPS limiter is removed. If this stayed in use, you’d have skis rocketing up to whatever max speed then being pulled back massively down to 68.
2) the REV limiter is increased, usually to at least 8000 RPM, and no more than 8800 RPM with stock components. (Anything above 8800 RPM, it’s recommended to upgrade the valve springs and retainer clips in the valve train.
3) the ECU maps are adjusted for different timing, air fuel ratio etc, to allow for more HP and Torque throughout the RPM band.
Of course there are supporting modifications and parts that need to go along with these changes like larger air intake, more cooling, different impeller and pitch, intake grate, maybe a blow off valve, new intercooler. Etc etc.

With all of that said, the SVHO powered Yamaha boats do not have a GPS limiter. There is no coast guard speed restriction on boats, at all.

However, the SVHO engines in the boats are still limited to 7700 RPM for reliability.
And yes, you can absolutely reflash the ECU to a higher rev limit. But again, without supporting mods you may see less gains than expected or even harm to the engine. More RPM means more heat. More heat means you need more cooling. The intercooler may not keep up so you experience heat soak / heat fade. If you do install the upgraded components then the ECU changes will be a lot more worthwhile.

I have a friend who owns a 2024 25’ Yamaha boat with twin SVHO. It hits 55mph, and after ECU unlock to 8700rpm and a few bolt on parts, he is HOPING for 65mph.

I think this is a bit optimistic, considering the SVHO FX Waverunners will jump from 70mph stock to 82mph with a reflash to 8700 RPM and minor bolt ons. That’s a 12mph increase and I just don’t see the big heavy boats getting more than a 6-7mph jump.

Hope this helps answer your question.

Neutron · Thursday at 7:42 PM

Willm said:
Hi Jay,

I’m not sure if this has been explained to you clearly by now. I ran across this post looking for information on map tuner tunes for the Yamaha boats for a friend of mine.

For some reason I can’t get all of these responses on this thread to load, so forgive me if this has already been clarified to you ad nauseam.

In case it hasn’t, here you go..

You seem to be only partially informed on how the Yamaha Waverunners are speed limited.

There are effectively two ways some models are limited to the supposed 67.5mph coast guard limit.

Firstly, all Yamaha SVHO waverunners are ECU limited to 7500-7700 RPM depending on the year and model. This is for reliability sake, as this RPM means the engine is only putting out about 85% effort of what the engine is capable of without needing modifications to certain engine components.

This RPM limit keeps the larger and heavier FX models right around the agreed 67.5mph limit. (Trim neutral, half tank of gas - and why they’ll really see 70-71 with trim up, and less gas in the tank).

However, the FZ and GP models still want to climb up to 70-72mph at these RPMs even with trim in neutral and half tank of gas. And even faster with trim up and less gas).
So, Yamaha secondly has a GPS limiter built into these skis, and as soon as the GPS sensor catches the ski hitting anything over 68mph, the limiter sends a signal to the ECU which dials back the engine RPM so the ski will dip under 68 again.
The FX does not have the GPS limiter.

The 2014-2016 FZ and 2017-2019 GP’s were extremely noticeable with how harsh the top speed fade off was.
You could actually feel the 3-4mph drop off after a second or two of running 70+mph. But if you pull back on the throttle down to 65 or so, you can hammer it, and get it back up to 70-72 for a couple seconds. There is a 2-3 second delay for the GPS to read the excess speed, send the signal, and the top speed drop off. The 2020+(I think) GP models still have the GPS limiter, but it’s a more gradual tapering of the RPM so the decline in speed isn’t really noticeable.

When you reflash these things, a few things are being changed.
1) The GPS limiter is removed. If this stayed in use, you’d have skis rocketing up to whatever max speed then being pulled back massively down to 68.
2) the REV limiter is increased, usually to at least 8000 RPM, and no more than 8800 RPM with stock components. (Anything above 8800 RPM, it’s recommended to upgrade the valve springs and retainer clips in the valve train.
3) the ECU maps are adjusted for different timing, air fuel ratio etc, to allow for more HP and Torque throughout the RPM band.
Of course there are supporting modifications and parts that need to go along with these changes like larger air intake, more cooling, different impeller and pitch, intake grate, maybe a blow off valve, new intercooler. Etc etc.

With all of that said, the SVHO powered Yamaha boats do not have a GPS limiter. There is no coast guard speed restriction on boats, at all.

However, the SVHO engines in the boats are still limited to 7700 RPM for reliability.
And yes, you can absolutely reflash the ECU to a higher rev limit. But again, without supporting mods you may see less gains than expected or even harm to the engine. More RPM means more heat. More heat means you need more cooling. The intercooler may not keep up so you experience heat soak / heat fade. If you do install the upgraded components then the ECU changes will be a lot more worthwhile.

I have a friend who owns a 2024 25’ Yamaha boat with twin SVHO. It hits 55mph, and after ECU unlock to 8700rpm and a few bolt on parts, he is HOPING for 65mph.

I think this is a bit optimistic, considering the SVHO FX Waverunners will jump from 70mph stock to 82mph with a reflash to 8700 RPM and minor bolt ons. That’s a 12mph increase and I just don’t see the big heavy boats getting more than a 6-7mph jump.

Hope this helps answer your question.

There has been many people who have tried to squeeze more speed out of these boats, some have reached a few mph more but nothing that is worth the money and time spent doing so.
There was a member who did a ton to his 192 and had increased the most out of anyone. But he made his own custom nozzle trim(which helped a lot)

Now a 255 with twin svhos after spending a 3ish grand on each engine. Upgraded cooling, intercooler, Prop, Intake, exhaust, ecu flash, etc. (Without updating the valve spring/keepers) getting 8600ish rpms
Realistically 7mph increase maybe 10mph

Is it really worth it to spend 6 to 8 grand.

I have customers who buy the whole Riva stage? Kits (which cost a lot) and drop off the ski for me to install just to get it to 82 to 85mph. I love doing it, just dont get the apeal.
These skis are fast and just with a reflash to raise the rpms without a speed limiter is plenty. My FZS is slightly moded and is plenty fast for me and i am rarely full speed on it

Willm · Thursday at 8:36 PM

Neutron said:
There has been many people who have tried to squeeze more speed out of these boats, some have reached a few mph more but nothing that is worth the money and time spent doing so.
There was a member who did a ton to his 192 and had increased the most out of anyone. But he made his own custom nozzle trim(which helped a lot)

Now a 255 with twin svhos after spending a 3ish grand on each engine. Upgraded cooling, intercooler, Prop, Intake, exhaust, ecu flash, etc. (Without updating the valve spring/keepers) getting 8600ish rpms
Realistically 7mph increase maybe 10mph

Is it really worth it to spend 6 to 8 grand.

I have customers who buy the whole Riva stage? Kits (which cost a lot) and drop off the ski for me to install just to get it to 82 to 85mph. I love doing it, just dont get the apeal.
These skis are fast and just with a reflash to raise the rpms without a speed limiter is plenty. My FZS is slightly moded and is plenty fast for me and i am rarely full speed on it

The RIVA kits are such a rip off for sure. I have modded 26 SVHO waverunners in total since 2015. 8 of which were mine and the rest friends. I’ve never spent an anything near $3,000, and all of them have done 82-86mph on GPS.

I buy the parts through GreenHulk or Dean’s Team as package deals without paying the markup of the riva “stage” kits. All of them are a little more involved than a stage 1+, but less than a stage 2, all for less $ than a stage 1.
The last one I did was a 2022 FX back in 2023. It cost $2100 in parts including the $500 license. That was after the fizzle intercooler was bumped up to $1000.

We are looking to spend about $4,100 in total on this boat.
$1000 each for the intercoolers.
$500 each license.
$250 each Impellers.
$200 each air intakes.
$100 each in cooling parts

Going to set limiter to 8800 RPM. Dean’s team 93 octane tunes.

I’ll try to remember to update here with top speed improvements. Hoping to see some acceleration gains too!

Neutron · Thursday at 9:08 PM

Willm said:
The RIVA kits are such a rip off for sure. I have modded 26 SVHO waverunners in total since 2015. 8 of which were mine and the rest friends. I’ve never spent an anything near $3,000, and all of them have done 82-86mph on GPS.

I buy the parts through GreenHulk or Dean’s Team as package deals without paying the markup of the riva “stage” kits. All of them are a little more involved than a stage 1+, but less than a stage 2, all for less $ than a stage 1.
The last one I did was a 2022 FX back in 2023. It cost $2100 in parts including the $500 license. That was after the fizzle intercooler was bumped up to $1000.

We are looking to spend about $4,100 in total on this boat.
$1000 each for the intercoolers.
$500 each license.
$250 each Impellers.
$200 each air intakes
$100 each in cooling parts

Going to set limiter to 8800 RPM. Dean’s team 93 octane tunes.

I’ll try to remember to update here with top speed improvements. Hoping to see some acceleration gains too!

You are spending 4100 on parts/license. No BOV? (Do they even make improved exhausts for these boats?) I know there is an improved waterbox.
That doesn't include labor. Not everyone will do some of these updates on their own. Some do because as you know the updates you are doing is relatively easy.

Please do post your results it will be interesting to see what gains a svho modded will turn.

Willm · Thursday at 11:20 PM

Neutron said:
You are spending 4100 on parts/license. No BOV? (Do they even make improved exhausts for these boats?) I know there is an improved waterbox.
That doesn't include labor. Not everyone will do some of these updates on their own. Some do because as you know the updates you are doing is relatively easy.

Please do post your results it will be interesting to see what gains a svho modded will turn.

Yeah all those parts can be installed by a half retarded drunk monkey on a PWC, even easier on a boat. Less than 3hrs of work each engine and pump. Even at $150/hr that’s only another $450 in labor per engine. Anyone who spends $6k plus for the level of upgrades I’m speaking of, to achieve a 82-86mph SVHO ski, or a ??mph boat… well I hope they gave permission and asked for lube.

Will post results in a couple months

jsr418 · 2025-02-21T17:59:29-0500

Hey Will,

Thanks for your reply. I totally understand and agree with everything that you mentioned. I worked with Jesus at Riva on this concept and idea. He mentioned that the ecus in the boats have the same limiters on them as the skis, not so much for the coast guard restriction but more as just a limiter. I think we all know that these svho engines can be awakened with very little work in a reliable way. I’m not looking to blow anything away here. Just looking for a few more mph. I did the updated air filters, ribbon deleted and tunes so far. I can always follow it up with the impellers and intercoolers if need be. I want to do it in stages to see what the gains are. Will report back here in the spring as well.

Jay

2023 255xd Maptuner X tunes

FSH 210 Sport

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dwakeman

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Thread 'RIVA Maptuner X ECU Reflash: Throttle Response and Speed Control'

jsr418

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jacoviii

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Willm

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Neutron

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Willm

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Neutron

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Willm

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jsr418

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