Exhaust Option - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 19 (permalink) Old 05-17-2017, 10:25 AM Thread Starter
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Exhaust Option

How much is it going to cost me if I by a Slip On Exhaust to have my fuel tuned?
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post #2 of 19 (permalink) Old 05-17-2017, 10:42 AM
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dont know off the top of my head if your 950 is fuel injected or has carbs.

It its injected it will adjust for the change in flow by itself.

If it has carbs you will need to re-jet them

in either case you will want to change the airfilter setup to get more flow...

its a slippery slope

and BTW, your gas mileage will be worse.
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post #3 of 19 (permalink) Old 05-17-2017, 10:51 AM
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My 950 is fuel infected, I put on a Cobra slip on and am using a Dynojet Power Commander V. The only reason my mileage got any worse was because I love to hear the pipe and love the extra torque. When I do my group rides I still get 50mpg 1 up and 48 when I 2up.
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post #4 of 19 (permalink) Old 05-17-2017, 10:55 AM
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"The only reason my mileage got any worse was because I love to hear the pipe and love the extra torque."

Exactly! It would be silly to spend all that time and money to get more HP out of your bike

and then never use it.
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post #5 of 19 (permalink) Old 05-17-2017, 10:57 AM
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Quote:
Originally Posted by kcw View Post
"the only reason my mileage got any worse was because i love to hear the pipe and love the extra torque."

exactly! It would be silly to spend all that time and money to get more hp out of your bike

and then never use it.
lmao......
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post #6 of 19 (permalink) Old 05-17-2017, 11:00 AM Thread Starter
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I already installed the Cool Air Intake vs the stock. (I hated the look of the over sized heart shaped cover) It is fuel injected (no carbs) but I was told if I change the exhaust as well, I would need to have the fuel re-tuned?
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post #7 of 19 (permalink) Old 05-17-2017, 11:02 AM Thread Starter
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Yeah, that Power Commander is about 500 bucks on its own correct?!
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post #8 of 19 (permalink) Old 05-17-2017, 11:09 AM
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I want to say I paid about 300 for it.
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post #9 of 19 (permalink) Old 05-17-2017, 12:13 PM
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Ive never been clear on this.

Is the power commander like re-programming the engine control chip on your car?

A fuel injection system has a starting point for how much fuel to spray
then it looks at the O2 sensor to see if its rich or lean
and adjusts the spray amount gradually over time.

what does a power commander do differently? However much air is being let in determines how much fuel must be injected.
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Last edited by KCW; 05-17-2017 at 02:09 PM.
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post #10 of 19 (permalink) Old 05-17-2017, 12:20 PM
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Quote:
Originally Posted by KCW View Post
Ive never been clear on this.

Is the power commander like re-programming the engine control chip on your car?

A fuel injection system has a starting point for how much fuel to spray
then it looks at the O2 sensor to see if its rich or lean
and adjusts the spray amount gradually over time.

what does a power commander do differently? However much air is being let it determines how much fuel must be injected.
The power commander goes inline of the engine control module between the control module and the fuel injection system. So it takes the paramaters you program into it and opens the injectors longer for more fuel or shorter for less fuel. It also has a box that goes in between the oxygen sensor and the engine control module. Unfortunantly on a bike (at least the ones I have worked on) there is no mass air flow sensor telling the computer how much air is coming in. So it does all of its programming by the oxygen sensor and throttle position sensor. There is a guy they talk about on here named Ivan that takes your control module and reprograms it. I am sure he does a GREAT job from what I have read on here. The problem is If you make a change it is a PITA to get it re-programmed for that change.
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