Low power due to BARO or MAP sensor - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 10 (permalink) Old 08-10-2015, 07:07 AM Thread Starter
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Low power due to BARO or MAP sensor

Hi,

I'm running a SP2, geared 16-42.

When I'm running 6th gear, the engine does not reach the limiter at full throttle (stops at appr. 9500rpm).

I have a PC3usb, open snorkel, deristricted airbox and open silencers installed. The PC3 was tuned on a dyno.

May it be possible, that there is a misreading from the BARO or the MAP sensor which causes the ECU to fall back on a safe mode?
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post #2 of 10 (permalink) Old 08-10-2015, 07:25 AM
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There is a soft rev limiter controlled by the ECU @9,200rpm

RC51 B2-A15 soft rev limiter mod is a great resource to get more of your questions answered.



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post #3 of 10 (permalink) Old 08-10-2015, 07:30 AM Thread Starter
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Originally Posted by madbuyer View Post
There is a soft rev limiter controlled by the ECU @9,200rpm

RC51 B2-A15 soft rev limiter mod is a great resource to get more of your questions answered.
THX, but I'm running an europeam model, which has no soft rev limiter
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post #4 of 10 (permalink) Old 08-10-2015, 12:03 PM
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Are you getting an FI indicator lit?
If so, check your fault codes via the service jumper.
Since it lists detected fault codes regardless of time, you may need to clear prior detected faults, and then check if new faults are detected.

If you don't have a service manual, you can download both N. America and/or Euro manual here:
Free RC51 Service Manual Download Honda RVT1000R RC51.info
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post #5 of 10 (permalink) Old 08-10-2015, 05:06 PM
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Quote:
Originally Posted by Sui77 View Post
THX, but I'm running an europeam model, which has no soft rev limiter
I kind of figured that after I posted...but then again I can't see your location.

The RPM of 9,500 was very close to the soft rev limit...it was worth a shot.



Good luck.



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post #6 of 10 (permalink) Old 08-15-2015, 10:45 AM Thread Starter
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Ok, done some more high speed runs today and I'm lacking power for sure.

Maybe fuel pressure might be a reason?
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post #7 of 10 (permalink) Old 08-16-2015, 07:43 AM
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Wouldn't a faulty MAP sensor cause you rough performance throughout your "high speed" tests?

Here is a link for the FPR test.
https://www.rc51forums.com/forums/301434-post2.html



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post #8 of 10 (permalink) Old 08-16-2015, 07:48 AM Thread Starter
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Originally Posted by madbuyer View Post
Wouldn't a faulty MAP sensor cause you rough performance throughout your "high speed" tests?

Here is a link for the FPR test.
https://www.rc51forums.com/forums/301434-post2.html
Hi!

Anything works more or less fine, but I#m not reaching the estimated speeds in 6th gear.


A faulty FPR would result in too high pressure, I think.

On the dyno, I reached 135hp at clutch, no failures recognized.

Maybe it's related to the high speed and the resulting air pressurE?

Last edited by Sui77; 08-16-2015 at 07:50 AM.
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post #9 of 10 (permalink) Old 08-16-2015, 12:35 PM
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A faulty FPR usually results in low pressure due to the regulator diaphragm failing, with fuel leaking past the diaphragm and into the vacuum hoses at the throttle bodies.
This usually causes an overly rich condition and poor idle at the least, and with fuel dripping from seams of exhaust pipes and flooding intakes at most.

Raise your tank, then pull the vacuum hose from the small fitting at the FPR diaphragm. Switch on the key to pressurize the fuel system.
If you see fuel dripping from the diaphragm hose fitting, then the FPR is bad and needs to be replaced.

Last edited by SubSailor; 08-16-2015 at 10:11 PM.
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post #10 of 10 (permalink) Old 08-16-2015, 02:10 PM Thread Starter
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THX

Will do so and report back
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