Kawasaki Sportsbike Riders Club - Australia - Online Forum

Just recently took my VTR to the Bike shop for a Major going over. New Qualifiers, New Camchains and Tensioners, New Oil, Filter, Coolant, Fluids, Brake Pads and discs.... And we came to the question of an air filter. I asked about K&N air filters and was told that they made the VTR run very erratic, and often required a dyno tuning to get to run smoothly. My question is, apart from bragging rights, whats the benefits of performance parts, opposed to stock standard ones? Does the average rider require these mods? And secondly, Could someone dispel some of the hype about dnyo tuning? Is there any notable difference in the bikes performance for dyno tuning it. What is stage 1, 2 and 3 dyno jetting / tuning all about?

All a "performance"" style filter does in essence is provide better flow. But often the trade off is filtering isnt as good. This is often due to the fact that the filtering material isnt as dence, which is why you get better flow.

If you have a bike with EFI, then often the ECU will adjust the correct a/f ratio so you shouldnt need a re-tune as the change in flow also, unless your stock setup is very restrictive and the change is such that the motor runs sloppy.

From my experience, I put a BMC filter in my zx10r and overall it felt better. I wouldnt say it was a night and day change, but I feel like it was worth it. As it made the motor feel like it would spin up quicker.
Where as on my Z1000, the air intake was very small and restrictive, so not only with the BMC filter again but opening up the air box more, it felt like a cap had been taken off the power and it had plenty more.

So the benefits as such as, the motor wont be bottlenecked as much so it will be free'd up to rev harder and faster as it can get more air. This in turn will make a little more power, but in the pursuit of doing all this, your prob going to waste a bit more fuel also!
It often compliments a full exhaust system also as it helps with the air flow increase

More to come from someone who knows about jet kits

most K&N filters are cleanable thats the best bit
I run a slip on + K&N filter with no issues about tuning or requiring re mapping or a PC3.

my understanding of dyno tuning is it allows the engine to be tuned under stress as opposed to normal tuning methods. It was explained to me that this allows for a more accurate tune. I am sure there are members that wiil be able to tell you more.

Saki wrote:All a "performance"" style filter does in essence is provide better flow. But often the trade off is filtering isnt as good. This is often due to the fact that the filtering material isnt as dence, which is why you get better flow.

If you have a bike with EFI, then often the ECU will adjust the correct a/f ratio so you shouldnt need a re-tune as the change in flow also, unless your stock setup is very restrictive and the change is such that the motor runs sloppy.

From my experience, I put a BMC filter in my zx10r and overall it felt better. I wouldnt say it was a night and day change, but I feel like it was worth it. As it made the motor feel like it would spin up quicker.
Where as on my Z1000, the air intake was very small and restrictive, so not only with the BMC filter again but opening up the air box more, it felt like a cap had been taken off the power and it had plenty more.

So the benefits as such as, the motor wont be bottlenecked as much so it will be free'd up to rev harder and faster as it can get more air. This in turn will make a little more power, but in the pursuit of doing all this, your prob going to waste a bit more fuel also!
It often compliments a full exhaust system also as it helps with the air flow increase

More to come from someone who knows about jet kits

THANKS

gman017 wrote:my understanding of dyno tuning is it allows the engine to be tuned under stress as opposed to normal tuning methods. It was explained to me that this allows for a more accurate tune. I am sure there are members that wiil be able to tell you more.

Okay....so who?

Storm Front wrote:

gman017 wrote:my understanding of dyno tuning is it allows the engine to be tuned under stress as opposed to normal tuning methods. It was explained to me that this allows for a more accurate tune. I am sure there are members that wiil be able to tell you more.

Okay....so who?

Anyone?

Don't put an aftermarket filter on the Storm. Just use a new genuine one and you will be much happier. There is no flow difference, and the design of the stock unit is done so as to stop issues with the pressure feed to the slides. As soon as you install an aftermarket air filter on the VTR you will need to re-jet it, and it wont necessarily make any power gains. The best thing you can do is make sure the inlet restrictors are out, the RHS exhaust has been ground out (take off the right muffler and look into the header pipe, you will see what I mean) and get a nice set of pipes if you dont have them already. After that, blocking the PAIRS pickup in the airbox will get ride of the backfiring. You should be able to get good gains doing this. A stocker normally does around 92 to 95hp on the dyno, but with the mods you should see 105-108hp. A definite worthwhile gain.

I spent a fair bit of time with my storm playing with everything, including a bunch of dyno time. I am a pro tuner myself (cars) and sit on a dyno all day long so I speak from experience.

All the best.