MVAgusta.net

MVAgusta.net (https://www.mvagusta.net/forum/forum.php)
-   Brutale B4 (https://www.mvagusta.net/forum/13-brutale-b4/)
-   -   engine pulsating around 5500 rpm (https://www.mvagusta.net/forum/13-brutale-b4/32400-engine-pulsating-around-5500-rpm.html)

gtedeschi 07-03-2010 09:07 PM

engine pulsating around 5500 rpm
 
I test drove an 08 910r today and noticed a small pulsation from the engine around 5500 rpm as if the bike lurches forward/back repeatedly (mild). Is this normal?

dmac666 07-03-2010 09:20 PM

Yes, mine did it to. A Powercommander smoothed out the surge at 5500rpm really nicely.

Dave.

agusta 17 07-04-2010 01:56 AM

That's not an option for 08 models with oxygen sensor. Search closed loop ecu for more info.

dmac666 07-04-2010 03:57 AM

My Brutale has the closed loop system with the lambda sensor in the exhaust. The PCIII made a huge difference.

harryweld 07-04-2010 04:37 AM

The surging is quite normal around 70 to 80 mph in top. It seems as if the ECU is not sure which part of the map to use and is constantly changing between one setting and another. I have the corse exhaust and race chip fitted which is supposed to be an improvement over the standard set up but it still dose it.

agusta 17 07-04-2010 04:48 AM

Quote:

Originally Posted by dmac666 (Post 362853)
My Brutale has the closed loop system with the lambda sensor in the exhaust. The PCIII made a huge difference.

Don't mean to dispute your experience. I just based that on the fact that Dusty at DynoJet in nearby Vegas told me that the power commander won't have any effect below 6000 rpm.

That was after I installed the power commander, had it on a dyno and saw no change of any kind to the performance characteristics of mine.

I'm glad it helped yours though.

esq'z me 07-04-2010 12:05 PM

The surge at 5000 rpm was a documented problem, corrected with a new ECU.
Mine did it as well when it was new, and ECU was replaced under warranty at the first service. No problem after.
If this one has the new ECU already then the dealer needs to check the throttle body synch and TPS.

Power Commander does not make a unit for the 5SM ECU which has sequential injectors rather then the paired injectors of earlier bikes....the PC also cannot overcome the o2 sensor signal below 6K rpm. The injectors are also wired with a different polarity then earlier bikes, making it necessary to re-wire the PC plugs...and the PC will read wrong rpm unless a software patch is downloaded.

Fast By Ferraci will reflash your ECU for modifications like exhaust...for a ridiculous amount of money. Or you can order a "kit" ECU for the race exhaust from MV....or a Microtech from X-Bikes.

But if your bike is stock it should not surge at 5~6K steady cruise.

firedancer 07-04-2010 01:10 PM

i got rid of it by just using the more expensive high octane fuel.
shell sells here in germany the "power racing 100 octane". a bit
more expensive, but with it the bike runs smooth as silk.

squibby 07-04-2010 11:37 PM

Quote:

Originally Posted by esq'z me (Post 362994)
Power Commander does not make a unit for the 5SM ECU which has sequential injectors rather then the paired injectors of earlier bikes....the PC also cannot overcome the o2 sensor signal below 6K rpm. The injectors are also wired with a different polarity then earlier bikes, making it necessary to re-wire the PC plugs...and the PC will read wrong rpm unless a software patch is downloaded.

http://www.powercommander.com/powerc...mdl=82&yr=2006

Power commander DO make a PCMIII for the 5SM ECU. (as per above) They haven't bothered offering official support for the Brutale which means they haven't bothered to release base maps for that bike, but any half decent PCM dealer will be able to whip up a custom map for the 910 by modifying a similar map like a F4 1000 for example.

squibby 07-04-2010 11:42 PM

Quote:

Originally Posted by agusta 17 (Post 362859)
Don't mean to dispute your experience. I just based that on the fact that Dusty at DynoJet in nearby Vegas told me that the power commander won't have any effect below 6000 rpm.

http://www.powercommander.com/powerc...dl=278&yr=2009

Sounds like the Dyno guys were getting confused with the PCMV (PCM5). I will ask at my local Dyno this Wednesday to see if the PCMIII has the same limitation. The 1078R and later 910 all have the 5SM ECU.

5500 rpm is generally the part of the rev range that vibrates your arms off. Why would you want to stay near the part of the range anyway? Does it get in the way of Cruising? I'm generally either between 2500-4000 when pootling around town, or 7000 upwards when I wanna go fast. I think the guys at MV selected an undesirable part of the rev range as a suitable compromise between economy riding, and performance riding when the engine really starts to get 'on-cam'. There's no variable valve timing, so there is always going to be a compromise somewhere.


All times are GMT -5. The time now is 01:33 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.