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Dcreased Mileage on 08 zx6r?
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Dcreased Mileage on 08 zx6r? - September 16, 2012, 07:58 PM

Hey guys,

Got a question, I have noticed that my gas mileage on my ninja has gone down a fairly decent amount. Previously i could make it about 110-120 miles before the reserve light came on, but now I make it to about 75-80 when the light comes up. Granted, I know that with the reserve light, there is still 10-15 miles to go, i still think this is a pretty significant drop. I do have a Yoshi slip-on and did have the catalytic converter cut out and a straight pipe welded in. Also, I don't currently run a power commander, although it is on my to get list. I haven't seen or smelt any gas leaking, although taking the tank off to inspect would probably be my next step.

Any thoughts on what would be the cause?


2008 Yamaha R6: Track
2003 TTR "125": Ohhhh shittt wheelie!
2008 Kawasaki Ninja ZX6R: Street
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September 16, 2012, 08:35 PM

You need a PC or Bazzaz unit. You have a poor mans full exhaust with no tuning to compensate for it.


More gas, less brake
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September 16, 2012, 10:40 PM

Quote:
Originally Posted by okayh View Post
You need a PC or Bazzaz unit. You have a poor mans full exhaust with no tuning to compensate for it.
So the bike's mpg would drop 20-25 miles without the tune?


2008 Yamaha R6: Track
2003 TTR "125": Ohhhh shittt wheelie!
2008 Kawasaki Ninja ZX6R: Street
2005 Kawasaki ZZR600: Sold
Honda CRF150F: Sold
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September 17, 2012, 05:42 AM

Quote:
Originally Posted by rock6r View Post
So the bike's mpg would drop 20-25 miles without the tune?
Engines make more power when they can "breathe" easier. Being able to get air in and out with less restriction helps, but also requires the amount of fuel needed to match the amount of air coming in (Air-Fuel Ratio). The AFR is an important factor when talking about power and/or fuel economy. The ECU is tuned for the factory equipment and since it is an open loop controller (no O2 sensor to tell the ECU what is going on), no compensations can be made to fuel delivery based on air-fuel ratios. Since you removed that in a big way (unlike just a slip on) you will run leaner.

Lean running engines also tend to have higher exhaust gas temps so damage can be done to your motor. Also, you may feel hotter in the crotch from the undertail exhaust and nobody likes that.

peep this image. Simplistic but shows the idea. You moved to the right with the full exhaust. A freer flowing air filter vs OEM would produce the same effects



As far as fuel management systems go, if you want to learn more about them jump over to zx6r.com. A regular there works for Bazzaz and wrote a break down on the subject: The Breakdown on Fuel Management Systems - ZX6R Forum


More gas, less brake

Last edited by okayh; September 17, 2012 at 05:44 AM..
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September 17, 2012, 06:38 AM

you cut the cat out and added a slip on.. with no fuel management you are just spitting it away.. bike is probably running super rich.. popping on decel??

same thing happened to me when I did that on mine.. i have an 07 zx6r.. get a PC and get it tuned right.. you'll be fine after that.


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September 17, 2012, 11:32 AM

Thanks for the replies guys, that link gave me a lot of knowledge! I knew I had to get a PC, or Bazzaz eventually but that has to happen sooner now. Did you all take the bike to a shop for tuning, or just picked a map online and downloaded it?


2008 Yamaha R6: Track
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2008 Kawasaki Ninja ZX6R: Street
2005 Kawasaki ZZR600: Sold
Honda CRF150F: Sold
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September 17, 2012, 11:41 AM

Give Rick a call. He knows Kawi's pretty well.

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