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CrazyMotorcycleGuy
Most users ever online was 4,519, September 2, 2015 at 03:26 AM.
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cut airbox
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cut airbox - March 2, 2006, 07:48 AM

I have a relatively new (to me) ducati supersport 750 and it arrived with a cut airbox. It also has two brothers carbon oval slip-ons. My questions are these - has anyone cut their airbox and run into trouble in the rain? Has anyone noticed a decrease in torque due to the cut box (I've heard of people saying torque went down and hp went up when they did this to their bike). Given that I've got the slip ons ad the cut box, do I need to go get that thing dyno tuned? I am really not all that interested in sqeezing another 2 or 3 hp out of the bike and would much rather have hassle free riding...so I was thinking about replacing the part with an OEM airbox if it is going to cause me too much trouble. Thoughts?


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March 2, 2006, 07:50 AM

I do know it's simple physics that when you shift you will lose pressure (torque) into the engine with a cut airbox, but will gain horsepower... at least that's the way it is in cars, doubt it's any different in a bike application.


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Last edited by B; March 2, 2006 at 07:53 AM..
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March 2, 2006, 08:12 AM

You’re not losing torque. You’re simply moving it up the rev range. So if you rode the bike all the time you wouldn't feel it where you used to feel it and think you "lost” it. Allowing more air into the engine wouldn't reduce torque.

The physics comes into play when people put intakes on their cars (or exhausts but this isn't about that). you're lengthening the intake so diameter of the pipe makes a big difference.

In this case the diameter of your intake system is not increasing...just the initial hole which was a bottleneck anyway.

It's probably not necessary to get it dyno tuned...but do keep in mind that ducati (like most manufacturers) run their bikes on the lean side for emissions purposes. When you make the intake and exhaust less restrictive you’re allowing more air but the bike isn’t adjusting for more fuel. Now you’re running even leaner. Is the SS injected or carbed? If injected just get a chip from either Fast by Ferraci or FIM. If carbed I would take it to a good shop to have the carbs adjusted.

Good luck mang.


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Last edited by drnknmnky13; March 2, 2006 at 08:22 AM..
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March 2, 2006, 11:14 AM

it is injected...any more info on these chips?


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March 2, 2006, 12:26 PM

Fast by Ferracci (FBF) chips can be found here: http://www.ferracci.com/store/cart.p...duct_list&c=23

The FIM chips (which I prefer due to the ability to reprogram) can be purchased at most speed shops. With the FIM you need to have it Dyno tuned. The advantage is you get a map custom tailored to YOUR bike. Not settings from bikes like yours. Of course with the FBF chip you're saving lots of dough and the mapping is pretty close. Good luck either way man. If you need any help let me know.


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March 2, 2006, 12:32 PM

How much does a Dyno run?
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March 2, 2006, 01:00 PM

I checked the FBF chips and they don't seem to have one for the 750ss engine.


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July 7, 2006, 11:14 PM

Cutting the airbox open without remapping will most likely run lean, and you would lose some torque and power. if you have FI, I would see if you can pick up a power commander, and then try some of the maps on the site, which suck. Then you might hit a ducati site like the DML looking for someone who might give you a dyno'd map for the same engine, and setup ie. slipons, cut airbox, 750. Otherwise spend some loot on a dyno'd map, or find an untouched stock airbox lid and close it back up. If you have carbs, talk with chris kelley at CA Cycleworks for jet kit.

If the air fuel hasn't been adjusted since the cut airbox, your bike is gonna hiccup and give you poor performance. Stock Ducatis tend to run lean and cutting the airbox make it worse.
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July 8, 2006, 10:15 AM

Most modern fuel injected bikes have the airbox designed a particular way for a reason. If you fiddle with one thing, you must go through the entire fuel/air series with different parts, and electronic mapping. Cut boxes can create turbulance in the box, and can actually prevent air from entering smoothly.


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