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Noob needs help
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Posted: 07/17/05
10:02 AM
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Quick Q everybody- I saw that device called the Dynojet Powercommander, I belive it helps richen/lean the mixture youre running. Just wondering....If i was to get a slip-on pipe, lets say Yoshimura, for a 600, I've heard that sometimes after installing the pipe riders can experience a "flat spot" while riding. How can this be prevented? What exactly does the Dynojet Powercommander? If I was to get a slip-on, would I have to readjust the jet clip on the bike? Althought I don't have a bike yet, I was just wondering about this, I kinda figured the first thing I'd do to modify a bike is get a slip-on...
www.MinimotoGP.tk
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wheelspin
Enthusiast
| Posts: 318
| Joined: 05/05
Posted: 07/17/05
10:11 AM
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It's doubtful that you would need to change the fuel ratios with a slip-on muffler, nor that you would realize any significant power gains if you did. The "flat-spot" that you're referring to would only occur if you installed a full race exhaust system, which would be the point at which you'd need the Power Commander.
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Posted: 07/17/05
11:02 AM
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I hate to sound like an a-hole, but I think the main reason I would get a full-system/slip-on is just for looks and sound. Obviously, a simple slip-on isnt going to do to much power wise. Thanks for the tip, I appreciate your input.
www.MinimotoGP.tk
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wheelspin
Enthusiast
| Posts: 318
| Joined: 05/05
Posted: 07/17/05
11:34 AM
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I don't mean to sound like an a-hole either, but just so you know:
Quote:
If I was to get a slip-on, would I have to readjust the jet clip on the bike?
The Power Commander is used on bikes with electronic fuel injection, which replaces the carbs, so there's no needle jet clips to adjust.
If you were installing a slip-on muffler on a bike with carbs, would you need to adjust the needle clip? It's quite possible, but obviously would depend on the bike.
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Posted: 07/17/05
01:53 PM
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Quote:
I hate to sound like an a-hole, but I think the main reason I would get a full-system/slip-on is just for looks and sound. Obviously, a simple slip-on isnt going to do to much power wise.
On the contrary, I only have a slip-on and with the addition of a Power Commander and BMC air filter I gained 17 hp and 7.2 ft/lbs of torque. Now that's not the norm for any bike you pipe and map, but you can definitely get a decent gain in power if you really wanted to. The Power Commander is an invaluable tool to make a bike more "streetable". The Power Commander does alter your fuel curve through a map that can be adjusted via a laptop. Also, there are many shops that are Dynojet licensed that can custom-map your bike for you. Dynojet also has a map for almost any bike you could think of and it will most likely cure any hiccups you'd expierence, such as power dips and on/off throttle hesitation. If you're looking for sound/looks, definitely get at least a slip-on and NOT a bolt-on.
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wheelspin
Enthusiast
| Posts: 318
| Joined: 05/05
Posted: 07/17/05
06:19 PM
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Quote:
On the contrary, I only have a slip-on and with the addition of a Power Commander and BMC air filter I gained 17 hp and 7.2 ft/lbs of torque.
Your figures are misleading because you added a BMC air filter and your bike is a ZX-10R, which already produces 155-160 hp. A 600 will gain maybe 2 hp max with a slip-on, and changing the fueling doesn't help much, if at all.
Quote:
Also, there are many shops that are Dynojet licensed that can custom-map your bike for you. Dynojet also has a map for almost any bike you could think of and it will most likely cure any hiccups you'd expierence, such as power dips and on/off throttle hesitation.
While you may have had good results, in my opinion I would stay away from trying to tune on a Dynojet dyno, because there is no load being put on the engine with a Dynojet. All the Dynojet dyno does is measure the bike's ability to spin up a weighted drum, which must include inertia into the computations; that is why they're called "inertial" dynos. Every single bike I have ridden that was "dyno-tuned" on a Dynojet had fueling issues of one sort or another. The only way to truly tune on a dyno is to subject the engine to a static load while taking hp measurements (such as with an eddy current or brake dyno). What type of dyno do all the factory teams use? A brake dyno. I have also heard consistent reports that the downloadable maps don't work very well, which falls in line with my opinion that every bike is different, and requires different fueling curves.
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