[Spark_Fighter]

Did somebody tried universal K&N filters directly on the throttle bodies ?

I made this with my heavily modified Road Star Warrior 102CI and the response was a lot better than any performance air filter kits available on the market.

 

[Secret Squirrel]

That's not a good idea at all for the SF. The air box is a Helmholtz resonator design. Doing away with that would creat all kinds of problems.


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[flynbulldog]

Actually the injectors sit a few inches above the throttle bodies out in the open.
There's no way to put an air cleaner over it.

 

[Spark_Fighter]

Which kind of problems ?

Something impossible to solve with a serious map on Bazzaz ?

I think the worst thing could happen is running too lean...and water on filters during rainy days.

 

[Spark_Fighter]

Thanks for the vid man !!!

I never open the airbox yet, so I think some carbon air ducts and performance filter will be the best setup.

 

[Spark_Fighter]

thanks man !
very informative... starting my first Duc project...

 

[Thirdrail]

Personally I wouldn't put a K&N air filter on anything!

 

[Wonway]

I used to work on many old bikes with K&N "Stage 3" individual filters.

Talk about bad fueling at low rpm's

I'd like to tell you not to do it, but you are a big boy and can decide for yourself. That is, if you can figure out how to make one fit. :think:

Just don't say we didn't warn you.

 

[Pnut]

Off topic, but what rear sets were on the bike in the vid?

 

[flynbulldog]

Not my bike but they look like satos to me.

 

[STFTR]

Ducati Streetfighter fuel injector startup - YouTube

Awesome video showing it in action, thanks flynbulldog for posting :yeah:

I used to run the over the throttlebody filter over my 996 as it did a better job catching junk but there's no chance of doing it with our fighters and I prefer our setup better anyways, well except for the stock small intakes.

 

[moperfserv]

Might I add a little?
The 'over-the-velocity-stack' filters of the good old days cost about 10HP.
When you get close to the velocity stack turbulence occurs and goes all the way to the valve, cutting off part of the valve area.

Carbs vs FI; Carbs meter fuel based on small pressure changes (it takes about 1inch of water negative pressure to get the fuel from the float level to the throat of the carb) and FI meters fuel based on RPM and either Manifold Air Pressure or Throttle Position. TP in the case of the Streetfighter.

This means that changing the inlet configuration on a carbed bike makes a big change in fuel delivery, while it makes very little change on a fuel injected vehicle.

The way things changed on carbed bikes implies that the inlet config changed the total system air flow a lot, but in fact it didn't, just the jet size requirement.

Add to that modern sophisticated air-box design which does a pretty good job of optimizing air-flow, and removing the air-box has very little effect on the calibration.

Combining both the velocity stack vulnerability to the addition of objects close to the lip, and the 'no improvement' aspect of removing the air-box and you'll probably be creating more problems than you'll solve.
And, don't forget the tuning.

Doug