Ducati Monster Forum

I read somewhere that it doesn't increase power to open the airbox or put pods in.  Is that true?  I want to open the airbox and improve the fuel system.  Whats the difference between fatduc and pcIII and whatever else is out there?  Should I order the stuff and have the mechanic do it?

The mufflers have that little backfiring popping more than the other monster I had.  I'm wondering if the fuel system isn't tuned right or something.

what bike do you have?

Fatduc is jsut a gadget that tricks your ecu into deliverying more gas.
PCIII is a tuning system that takes takes over your ECU controls and adds or takes away gas.

theres a few other systems out there. but PCIII seems to be the best at doing what they do. I have a rapid bike 3. its okay.

The FatDuc is awesome, I don't care if it's a gimmick.  You can literally buy it and put it on your bike in less than 5 minutes.  It requires absolutely no tools other than a small flathead, or equivalent shaped object, to turn the potentiometer dial.  It only has that potentiometer adjustment and nothing else.  It comes with simple instructions.  It only affects the air/fuel ratio below about 5k rpm where your O2 sensors give input to the ECU.
I like the DP ECU the best as a full rpm range fueling solution.  It's not adjustable, but it's simple and tested.  I'm sure the PCIII is nice as well, but the more adjustments the ECU has, the more I'm afraid I would be messing with it constantly.
 
You won't get more power just from increasing the air flow because you will be running lean, it's the same as any other motor.  You will get more power by increasing both the air flow and the fuel flow.
 
My guess is that because you have slip ons without catalytic converters that the lack of backpressure is making your bike run lean and causing the backfiring.  I have a feeling the FatDuc would make you pretty happy, it made my 695 sooooooooo much better.
 

I have an 08 695.

Would the DP ECU automatically know to increase the fuel because of greater fuel flow? If it's not adjustible, maybe it wont be as good for mods?

No

No - FatDuc has been used by folks with 695 to remedy the lean state of the bike from the factory.
The standard ECU will adjust a little - but not enough - especially if you open up the system by adding a higher flowing filter + open air box and/or pods. Adding those items without an item like a PCIII or FatDuc will not be good. The DP ECU should be able to handle it as well, if I remember correctly. But I'm not an expecrt on the DP ecu

The FatDuc can add fuel to the mix, but does so by fooling the ECU. The PCIII takes over and applies custom fueling. The difference being that the PCIII and add or remove fuel, and also can be set to incrementally add/remove fuel from the mix based on the engine RPM. Both good products, but PCIII will see you more versatility and customization/ *But* to have it work it's best, it needs to be set up in conjunction with a Dyno tune.

I know your bike has aftermarket cans - so that discussion isn't needed here.
But regarding your popping - many times popping is just a sign that there's a tiny leak in the exhaust. Go over all the pipe to pipe connections in your exhaust and make sure they are all snug.  I had a 620 that developed a regular popping habit, when decelerating. Going around, loosening, wiggling then retightening the connections from my headers to the slip ons solved it.

Have you read the closed loop sticky yet?

http://ducatimonsterforum.org/index.php?topic=655.0 (http://ducatimonsterforum.org/index.php?topic=655.0)

wow, that's alot to take in.  thanks for the link.  

So why do slip on's not allow as much air through as a full exhaust mod?  Can I get aftermarket pipes to fit to my marving slip ons?  Would I get that much more power with a full exhuast system?

from what I gather, the popping on deceleration means I'm already lean.  Should I get a fatduc for this? 

Slip ons just allow for greater venting of exhaust gasses. If the intake side of the engine is still restricted then one sees little to no benefit (power wise) from slip ons. Think of it as feed a small pipe into a larger one - one can only pass just so much water through the small pipe, and it's less than the flow capacity of the big pipe.

Generally it biggest gain is seen when you do slip ons, air box and fueling. Going to a full system - like larger or custom headers will get more power, but the cost per increment of power tends to head down.

Popping can be caused by a couple things - so the leak theory is still valid and easy and free for you to check yourself - so might as well.

that forum link said the power gains with just slip ons is minimal, and you don't need to change the fuel tuning??

Correct - you will get some gains with just slip ons as the stock cans are a bit over restrictive... But if you do slip ons, allow more air and add fuel to compensate for the greater air intake - then you'd get more.

Is $800 a good price for a dp ecu with the filter and modified box?

Read on the net for while.  You will find alot of info about fueling for ducs.
Is $800 a good deal?... I say no because you can get your ECU reflashed to DP ECU for $250.  Filter and modified box...?  That means nothing, you can chop your own airbox and buy your own airfilter for less than $30.

I read somewhere you can't flash the newer ecu's.  I have an 08

AFAIK, you can currently flash any of the "classic" monster ECUs. 695's would be included, but 696/1100 are a no-go right now.

Do a search for the various threads and people's experience.