F4 engine rev question - MVAgusta.net
 
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post #1 of 6 (permalink) Old 11-30-2015, 04:33 AM Thread Starter
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F4 engine rev question

This question applies to the 2005 and 2006 models.

I was currently looking at a 2005 MV Agusta F4.

Here comes the question.

While revving the engine in neutral - a quick turn and let go - rpms go only up to around 4K and than fall right after - the bike behaves as expected.

Now, I disengage the clutch, shift to the 1st gear. While the clutch is still disengaged, I rev the engine the same way and it seems like it lost power and it doesn't rev as fast.

Is that normal or is there an issue here? Shouldn't the engine rev the same in neutral and in gear while the clutch is being disengaged? I was told the bike has something like a launch control and that kicks in??? I don't think that would change the revs.

Also another thing was, while taking off slowly, the bike gains lots of power at around 2,300rpm, but not much under that. The only aftermarket stuff is the whole Brembo brake set-up, titanium corsa headers and the mid pipe. Under the seat I noticed the power commander unit.
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post #2 of 6 (permalink) Old 11-30-2015, 04:57 AM
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Yes, with the clutch in it is a bit restricted. Not sure how it really works.

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It growls and rages and flies across the tarmac like a wild animal that has escaped the confinement of a cage and after merely waiting restlessly until the release, will not endure being locked up ever again.


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post #3 of 6 (permalink) Old 11-30-2015, 04:58 AM
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The mapping changes in the ECU from when the bike is in Neutral compared to when it's in Gear, this will explain your first question.

The way the bike runs when you're riding it, is purely because of the way it's tuned, doesn't sound like it's been done very well, there's your second question.

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post #4 of 6 (permalink) Old 11-30-2015, 06:04 AM
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I read somewhere that is a feature so you can't easily/accidently pop wheelie or flip the bike when you give it a fist full of revs in 1st gear.

Slow is smooth and smooth is fast!!
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post #5 of 6 (permalink) Old 11-30-2015, 06:12 AM
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Very normal....clutch drag is one thing....another is all modern bikes have ignition and fuel maps in first gear to control acceleration......yep, keep you from going over backwards, but also enable smooth take-off and fast starts.......many bikes have specific maps for every gear.

Aftermarket sells "Timing Retard Eliminators" for the drag race crowd. And also devices to trick some bikes into thinking they aren't in top gear when they are so they can get beyond the 186 mph gentleman's agreed top speed..

I used to be fast....now I just dream about it.
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post #6 of 6 (permalink) Old 12-02-2015, 01:23 PM
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Merc07 here on the forum is very familiar with the throttle response issue in neutral vs. in gear. It's programming in the eprom that is responsible. He writes custom eproms that either eliminate or improve it.

I bought a 339 mile '05 F4 1000s four years ago that was completely stock. That throttle thing bugged hell out of me too, but it is completely normal. It is not any sort of 'launch control'.

John
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