Author Topic: Rev Boost  (Read 1624 times)

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Offline Cut4fun .

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Rev Boost
« on: January 06, 2014, 01:24:22 pm »
Just seen a post from Spike60 that needs to be saved so folks understand the husqvarna rev boost feature on the new saws.  This was talking about the husky 550 at the time.

Quote from: Spike60
The rev boost is nice when limbing, but a non factor for bucking.   Lot's of folks aren't really sure what it is. It gives you a 2 second burst of an extra 2000 rpm when you hit the trigger.
 But keep in mind that any cut longer than 2 seconds and you are back down to 14,000.

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Offline Eccentric

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Re: Rev Boost
« Reply #1 on: January 06, 2014, 02:27:40 pm »
That kinda creeps me out.  I'm sure it's great for limbin', but if I didn't know any better (when running one of those saws), I'd be thinking the saw had an air leak. :o



Offline 660magnum

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Re: Rev Boost
« Reply #2 on: January 06, 2014, 03:06:26 pm »
I have a 550 and have not noticed any evidence of rev boost working that way or even having rev boost?

Had the tach on another 550 and it was just rev limited by the coil at 14000. Mine just goes up to around 13900 with no ignition bucking from the coil.

Now don't get me wrong, it is a nice light weight and powerful chainsaw that is great for limbing.
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Offline 3000 FPS

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Re: Rev Boost
« Reply #3 on: January 07, 2014, 07:58:40 pm »
With the new auto tune feature I can see how they can now program the electronics to do pretty much what they want.    So this is just another feature that they can try and sell to the consumer.   For limbing I do not think it is something I would need myself.
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Offline rms61moparman

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Re: Rev Boost
« Reply #4 on: January 07, 2014, 08:59:54 pm »

I've never seen the need for that in any of my limbing saws.
I took a Mastermind ported S25CVA to the woods last Saturday and it was all the limbing saw I could ever need!!!! ;D
I guess it is nice to know what is going on with the new saws though.


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Offline SawTroll

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Re: Rev Boost
« Reply #5 on: January 08, 2014, 03:21:59 am »
I have a hunch what this could be about, but am not sure enough to post it before Spike has joined here.....

The revboost seems very present when I press the trigger on my 560xpg, but I never put a tach to it.

Offline Magnus

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Re: Rev Boost
« Reply #6 on: January 11, 2014, 04:48:58 am »
Timing curves and active timing settings. That is how they learn.
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Offline Cut4fun .

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Re: Rev Boost
« Reply #7 on: January 11, 2014, 09:58:38 am »
I have a hunch what this could be about, but am not sure enough to post it before Spike has joined here.....



 ???  Please tell us what your hunch is?   ??? This ought to be a good made up one.  ::) ::)

I'll tell you why I posted it. So folks can learn from spikes post.

Offline 3000 FPS

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Re: Rev Boost
« Reply #8 on: January 11, 2014, 11:54:39 am »
Timing curves and active timing settings. That is how they learn.

So the spark timing for the autotune is controlled by electronics that can be changed while the saw is running?
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Offline Magnus

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Re: Rev Boost
« Reply #9 on: January 11, 2014, 01:28:25 pm »
Not can, it continually change. It adapts, learn and control contiually.
It has set parameters to follow, diagrams that tell when it shall spark, this is adapted after current speed and load constantly.

It used to be one fixed timing cure, now it is several curves none fixed.
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