• Welcome to Jetboaters.net!

    We are delighted you have found your way to the best Jet Boaters Forum on the internet! Please consider Signing Up so that you can enjoy all the features and offers on the forum. We have members with boats from all the major manufacturers including Yamaha, Seadoo, Scarab and Chaparral. We don't email you SPAM, and the site is totally non-commercial. So what's to lose? IT IS FREE!

    Membership allows you to ask questions (no matter how mundane), meet up with other jet boaters, see full images (not just thumbnails), browse the member map and qualifies you for members only discounts offered by vendors who run specials for our members only! (It also gets rid of this banner!)

    free hit counter

2023 255xd Maptuner X tunes

Ok so this last weekend the weather was good for speed runs. I would call this "full power" testing
So on Saturday stage 1 8300rpm 12/18 twins stock cones (no L13). 56mph @ 8000 port / 7600 starboard.. Yes there is slippage cavitation down low hole shot punching it/ fullish throttles , it is quick to recover though but not an issue during wake sports.

  • Aug 02 3:00 pm
  • 77 deg F
  • 60%
  • 29.15 Hg
  • 62 deg F
  • 85.5
  • 10 mph
  • SE (97)
  • 92.529 % AD
  • 2634 ft. DA

On Sunday stage 1plus 8500rpm 12/18 twins stock cones (no L13). 58mph @ 8300 port / 7900 starboard.
Yes different tune. Midrange and top end felt great. It hit the upper 55mph fast. Then felt like 58mph was bam.
Issues.. hole shot ( Drag race style) cavitation. Normal take off / watersports OK. That can be addressed later.
The issue is at 58 boat gets a bit loose but 1%-3% on the ZipWake trim helps. but scrubs speed.
The scarry issue at 58mph the boat starts to wiggle on the last little bit of keel and any wave introduces proposing then One motor is dropping out or cavitation and the boat tries to make a hard Right I say Right but it might be left. I need to star videoing this...
There is no check engine light or warning faults. hopefully not a temp or knock issue.
So I believe that during the proposing a pump ingests air. It is hard to watch the RPMs to see how the motor is reacting at that time You know with the boat trying to hard turn it's self at the upper 50s. After this a slow to near stop than rev each motor and take off and go again.

  • Aug 03 1:00 pm
  • 72 deg F
  • 66%
  • 29.03 Hg
  • 60 deg F
  • 79.8
  • 10 mph
  • SE (121)
  • 93.137 %
  • 2414 ft.
With all of this the boat felt the best that it ever has. While tubing and changing directions it was hooked mostly. To driving a 25' boat like a jet ski and powering out of turns... There is still work to be done. I think one of the sets of twin is going to get re-pitched to a 13/19. Or compile all of this and call Leading edge.
 
Last edited:
Glad to see you’re getting some results !

That wiggle and sudden right turn is very disturbing…. That is a stability problem and in my opinion a huge warning sign, in certain conditions that could lead to a sudden capsizing at 58 mph.
 
jacoviii said:
Ok so this last weekend the weather was good for speed runs. I would call this "full power" testing
So on Saturday stage 1 8300rpm 12/18 twins stock cones (no L13). 56mph @ 8000 port / 7600 starboard.. Yes there is slippage cavitation down low hole shot punching it/ fullish throttles , it is quick to recover though but not an issue during wake sports.

  • Aug 02 3:00 pm
  • 77 deg F
  • 60%
  • 29.15 Hg
  • 62 deg F
  • 85.5
  • 10 mph
  • SE (97)
  • 92.529 % AD
  • 2634 ft. DA

On Sunday stage 1plus 8500rpm 12/18 twins stock cones (no L13). 58mph @ 8300 port / 7900 starboard.
Yes different tune. Midrange and top end felt great. It hit the upper 55mph fast. Then felt like 58mph was bam.
Issues.. hole shot ( Drag race style) cavitation. Normal take off / watersports OK. That can be addressed later.
The issue is at 58 boat gets a bit loose but 1%-3% on the ZipWake trim helps. but scrubs speed.
The scarry issue at 58mph the boat starts to wiggle on the last little bit of keel and any wave introduces proposing then One motor is dropping out or cavitation and the boat tries to make a hard Right I say Right but it might be left. I need to star videoing this...
There is no check engine light or warning faults. hopefully not a temp or knock issue.
So I believe that during the proposing a pump ingests air. It is hard to watch the RPMs to see how the motor is reacting at that time You know with the boat trying to hard turn it's self at the upper 50s. After this a slow to near stop than rev each motor and take off and go again.

  • Aug 03 1:00 pm
  • 72 deg F
  • 66%
  • 29.03 Hg
  • 60 deg F
  • 79.8
  • 10 mph
  • SE (121)
  • 93.137 %
  • 2414 ft.
With all of this the boat felt the best that it ever has. While tubing and changing directions it was hooked mostly. To driving a 25' boat like a jet ski and powering out of turns... There is still work to be done. I think one of the sets of twin is going to get re-pitched to a 13/19. Or compile all of this and call Leading edge.
Click to expand...
Sounds like chine walk. It would be interesting if you adding water to your center ballast would help plant the boat/pumps.
 
anmut said:
Sounds like chine walk. It would be interesting if you adding water to your center ballast would help plant the boat/pumps.
Click to expand...
It probably would but also the top speed would probably come down. The issue probably is also due to the outer most chine is removed 16" befor the transom only on the X models. You can see in the picture that right where the geen stops the side chine stops too.
 

Attachments

  • 3F2F4B73-4CFB-41AA-BE81-A0F02881D244.jpg
    3F2F4B73-4CFB-41AA-BE81-A0F02881D244.jpg
    138 KB · Views: 7
jacoviii said:
It probably would but also the top speed would probably come down. The issue probably is also due to the outer most chine is removed 16" befor the transom only on the X models. You can see in the picture that right where the geen stops the side chine stops too.
Click to expand...
Yeah, that makes sense...

could you install some waverunner spontoons in that spot?!
 
anmut said:
Yeah, that makes sense...

could you install some waverunner spontoons in that spot?!
Click to expand...
Your a genius I was wanting something removable. I was thinking of molding something up. I need to take a 255 fhs for a spin. They have a standard hull.
 

Attachments

  • 20250806_192129.jpg
    20250806_192129.jpg
    2.7 MB · Views: 7
Ok so this may help put it all together.
Look at 7/26 and 8/9. The temp and DA/AD are near the same but the Mph and the feel of the boat changed with the tune.

DATEECM tuneTEMPlake elev.Air DensityDensity AltitudeimpellerCone usedType of cavitionRPM PortRPM StarB top speedhook in turns midrange40 to 50+ wake surf cavit.overall
8/08/2024 last yrstock76849ft SML92.95%2479 ft.stock..L13yes all over7700750053goodgoodslowyes
8/17/2024 last yrstock84849ft SML89.95%3582 ft.12/20..L13none noteiced7500730051goodgoodslowno
8/18/2024 last yrstock81849ft SML90.71%3298ft12/20.stocklittle hard launch7600750052.5goodpunchyslowno
9/2/2024 last yrstock77849ft SML92.80%2526ft12/18.stocklittle@ hard launch. fast recov7800770053goodgood fastfasterno
7/12/2025Riva stage1 8300 Limit target 810082849ft SML90.10%3514ft12/20.stocklittle @ hard launch. fast recov7600750054
7/13/2025Riva stage1 8300 Limit target 810084849ft SML89.97%3572ft12/18.stocklittle @ hard launch. fast recov8000770056goodgoodslow - heat/humidity issues
7/19/2025Riva stage1 8300 Limit target 810092659ft LOZ89.21%3856ft12/18.stocklittle @hard launch. slower recov7800760051goodgoodslow - heat/humidity issues
7/26/2025Riva stage1 8300 Limit target 810089849ft SML89.26%40680ft12/18.stocklittle @hard launch. Slower recov7750760051goodgood +faster +no heat/humidity issues
8/2/2025Riva stage1 8300 Limit target 810077849ft SML92.5292634ft12/18.stocklittle @hard launch. faster recov8000760056good +good ++ faster ++no heat/humidity issues
8/3/2025Riva stage1 Plus 8500 Limit target 830072849ft SML93.137241412/18.stocklittle more @hard launch. faster recov++8300790058good ++good+++faster+++noGREAT BEST EVER, punchy throttle
8/9/2025Riva stage1 Plus 8500 Limit target 830086849ft SML88.703ft4047ft12/18.stocklittle more @hard launch. faster recov++7900770054-55good +good ++ faster ++no heat/humidity issues, punchy throttle but down a little
 
jacoviii said:
Ok so this may help put it all together.
Look at 7/26 and 8/9. The temp and DA/AD are near the same but the Mph and the feel of the boat changed with the tune.

DATEECM tuneTEMPlake elev.Air DensityDensity AltitudeimpellerCone usedType of cavitionRPM PortRPM StarB top speedhook in turns midrange40 to 50+ wake surf cavit.overall
8/08/2024 last yrstock76849ft SML92.95%2479 ft.stock..L13yes all over7700750053goodgoodslowyes
8/17/2024 last yrstock84849ft SML89.95%3582 ft.12/20..L13none noteiced7500730051goodgoodslowno
8/18/2024 last yrstock81849ft SML90.71%3298ft12/20.stocklittle hard launch7600750052.5goodpunchyslowno
9/2/2024 last yrstock77849ft SML92.80%2526ft12/18.stocklittle@ hard launch. fast recov7800770053goodgood fastfasterno
7/12/2025Riva stage1 8300 Limit target 810082849ft SML90.10%3514ft12/20.stocklittle @ hard launch. fast recov7600750054
7/13/2025Riva stage1 8300 Limit target 810084849ft SML89.97%3572ft12/18.stocklittle @ hard launch. fast recov8000770056goodgoodslow - heat/humidity issues
7/19/2025Riva stage1 8300 Limit target 810092659ft LOZ89.21%3856ft12/18.stocklittle @hard launch. slower recov7800760051goodgoodslow - heat/humidity issues
7/26/2025Riva stage1 8300 Limit target 810089849ft SML89.26%40680ft12/18.stocklittle @hard launch. Slower recov7750760051goodgood +faster +no heat/humidity issues
8/2/2025Riva stage1 8300 Limit target 810077849ft SML92.5292634ft12/18.stocklittle @hard launch. faster recov8000760056good +good ++ faster ++no heat/humidity issues
8/3/2025Riva stage1 Plus 8500 Limit target 830072849ft SML93.137241412/18.stocklittle more @hard launch. faster recov++8300790058good ++good+++faster+++noGREAT BEST EVER, punchy throttle
8/9/2025Riva stage1 Plus 8500 Limit target 830086849ft SML88.703ft4047ft12/18.stocklittle more @hard launch. faster recov++7900770054-55good +good ++ faster ++no heat/humidity issues, punchy throttle but down a little
Click to expand...
Is your weight/fuel load similar on these comparisons?
Nice chart though thank you
 
Neutron said:
Is your weight/fuel load similar on these comparisons?
Nice chart though thank you
Click to expand...
Yes always just the same 4 people 2 adults, 2 kids. 8 & 12yr. Fuel aways at 80% .and runs are first thing done after a short warm up off the trailer.
 
Last edited:
jacoviii said:
Ok so this may help put it all together.
Look at 7/26 and 8/9. The temp and DA/AD are near the same but the Mph and the feel of the boat changed with the tune.

DATEECM tuneTEMPlake elev.Air DensityDensity AltitudeimpellerCone usedType of cavitionRPM PortRPM StarBtop speedhook in turnsmidrange40 to 50+wake surf cavit.overall
8/08/2024 last yrstock76849ft SML92.95%2479 ft.stock..L13yes all over7700750053goodgoodslowyes
8/17/2024 last yrstock84849ft SML89.95%3582 ft.12/20..L13none noteiced7500730051goodgoodslowno
8/18/2024 last yrstock81849ft SML90.71%3298ft12/20.stocklittle hard launch7600750052.5goodpunchyslowno
9/2/2024 last yrstock77849ft SML92.80%2526ft12/18.stocklittle@ hard launch. fast recov7800770053goodgood fastfasterno
7/12/2025Riva stage1 8300 Limit target 810082849ft SML90.10%3514ft12/20.stocklittle @ hard launch. fast recov7600750054
7/13/2025Riva stage1 8300 Limit target 810084849ft SML89.97%3572ft12/18.stocklittle @ hard launch. fast recov8000770056goodgoodslow -heat/humidity issues
7/19/2025Riva stage1 8300 Limit target 810092659ft LOZ89.21%3856ft12/18.stocklittle @hard launch. slower recov7800760051goodgoodslow -heat/humidity issues
7/26/2025Riva stage1 8300 Limit target 810089849ft SML89.26%40680ft12/18.stocklittle @hard launch. Slower recov7750760051goodgood +faster +noheat/humidity issues
8/2/2025Riva stage1 8300 Limit target 810077849ft SML92.5292634ft12/18.stocklittle @hard launch. faster recov8000760056good +good ++faster ++noheat/humidity issues
8/3/2025Riva stage1 Plus 8500 Limit target 830072849ft SML93.137241412/18.stocklittle more @hard launch. faster recov++8300790058good ++good+++faster+++noGREAT BEST EVER, punchy throttle
8/9/2025Riva stage1 Plus 8500 Limit target 830086849ft SML88.703ft4047ft12/18.stocklittle more @hard launch. faster recov++7900770054-55good +good ++faster ++noheat/humidity issues, punchy throttle but down a little
Click to expand...
Well done on the chart!

It’s clear to see how much impact DA has on your results.
 
Last edited:
You must log in or register to reply here.

Similar threads

brian86992
Modern Yamaha jetboat diagnostics and engine parameter monitoring
Replies
1
Views
2K
Neutron
Neutron
Julian
  • Sticky
NEW MODEL INFO Yamaha 2023 Boats Pricing, Overview (Marketing material)
    • Like
3 4 5 6
Replies
117
Views
32K
Babin Farms
Babin Farms
swatski
RIVA Maptuner X ECU Reflash: Throttle Response and Speed Control
    • Informative
    • Like
3 4 5 6
Replies
112
Views
26K
FSH 210 Sport
FSH 210 Sport
ScottS
2017 Yamaha AR195 - Working through issues at elevation & addressing performance
    • Like
2 3
Replies
44
Views
7K
FSH 210 Sport
FSH 210 Sport
Back
Top