Decat = improved MPG? - MVAgusta.net
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post #1 of 27 (permalink) Old 07-02-2014, 10:57 PM Thread Starter
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Decat = improved MPG?

For those of you who have put the Arrow manifold on your Brutale did you notice that your MPG improved? I've gone through 3 tankfuls since I put the Arrow on and while the first two seemed to indicate my MPG went up by about 5-7 MPG this last one is pretty conclusive - I'm at 160 miles and the fuel light hasn't come on yet. Today's ride was about 70 miles of canyon riding and about 90 miles of fast two lane country roads mostly done at 75-90 mph.

I have the original ECU. Bike now has about 2K miles.

Any ideas why MPG would have gone up?


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post #2 of 27 (permalink) Old 07-03-2014, 12:06 AM
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It did make a difference on my F4.

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post #3 of 27 (permalink) Old 07-03-2014, 08:39 AM
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Perhaps by doing the de-cat, you have de-restricted your exhaust thereby leaning out the fuel mix with the greater airflow across the range.

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post #4 of 27 (permalink) Old 07-03-2014, 08:44 AM Thread Starter
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Originally Posted by silentservice703 View Post
Perhaps by doing the de-cat, you have de-restricted your exhaust thereby leaning out the fuel mix with the greater airflow across the range.
I asked my mechanic and he said it was the increased airflow which meant the throttle didn't need to be opened quite as far to maintain the same speed. Another good reason to de-cat - having another 30-40 miles in range makes a big difference here in Colorado.


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post #5 of 27 (permalink) Old 07-03-2014, 08:45 AM
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I would have the mapping checked, if you can. A lean condition will cause the motor to run hotter.

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post #6 of 27 (permalink) Old 07-04-2014, 03:00 AM
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Quote:
Originally Posted by silentservice703 View Post
I would have the mapping checked, if you can. A lean condition will cause the motor to run hotter.
Tis true Chuck.

Im interested in what happens when we remove the cat.
My understanding is that this reduces back pressure which affects the charge going into the cylinder.
But Id like to know more about this.
Joe
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post #7 of 27 (permalink) Old 07-04-2014, 06:05 AM
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Is there also not some sensor regulating this? In the end I don't think there will be much difference...

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post #8 of 27 (permalink) Old 07-04-2014, 08:25 AM
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Yes, there is a sensor for exhaust gasses, but it is only in play at very low revs.

Where's our ecu mapping experts?

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post #9 of 27 (permalink) Old 07-04-2014, 10:21 AM
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Yes,
you will run somewhat lean.

Check this out:
http://www.mvagusta.net/forum/showth...burini+headers

On the dyno chart you can see the AFR become lean with the decatted header.

And find out that the RR is running lean up to 5000 rpm and from 9000 rpm onwards.

The rev limiter will hit in at app 11.400 rpm and not as stated from MV Agusta at 12200 rpm. There is a lot of power to come up to 12200 rpm .

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post #10 of 27 (permalink) Old 07-06-2014, 04:22 PM
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The mgp on my 2005 F4 changed dramatically after I had it tuned. It was running very rich and killing my gas milage before. Now it runs a lot better and doesn't use so much gas. Also, getting ride if the charcoal canister snside the tank increased the tank capacity allowing longer rides between fill ups.

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