PC needed for slip on?

Prozzak2622 · Post by **Prozzak2622** » Mon Jun 15, 2009 12:55 pm

I am wanting my bike to have a lil more ROAR when I am going down the road and deffinately dont have the money for a full system. If I go with a slip on will I need the power commander? Any advice on exhaust?

fireblade · Post by **fireblade** » Mon Jun 15, 2009 1:14 pm

as far as I know you shouldnt need a PC for a slip on. Just get a slip-on that has a nice sound you like. Nothing worse than buying a pipe and you hate the sound. I just got a 2 bro's "slip-on" installed on my bike and I love the sound but its just a little loud. Nothing ear plugs cant fix.

WillK675 · Post by **WillK675** » Mon Jun 15, 2009 1:29 pm

Yeah, you don't need a pc. You can get a new map loaded if your willing to spend the money, but it's not necissary.

I just got a two bro's also, and I like it. I did have a new (non-custom) map loaded for it, and I did get a little more power in the lower rpms. But thats going to depend on your bike also.

Post by **dufremle** » Mon Jun 15, 2009 1:48 pm

Hey Will, I didn't realize how loud your exhaust was until I was behind you on 377. Once we got separated by traffic I thought 'wow, it just got quiet'. It was also a lot easier to concentrate on what I was doing. Guess I'm going to have to stay behing quite bikes.

WillK675 · Post by **WillK675** » Mon Jun 15, 2009 2:43 pm

Yeah, I like it.

But I always forget my earplugs and constantly curse myself. I got lucky and found a pair in the pocket of my jacket just before we hit 377 back. I was so glad I did, my ears were killing me.

Prozzak2622 · Post by **Prozzak2622** » Tue Jun 16, 2009 9:37 pm

Thats what I am afraid of... I ride my bike to work and any other time possible and dont want to get tired of hearing the exhaust, but the stock exhaust is just not doing it for me.. Thanks for the reply guys!!

WillK675 · Post by **WillK675** » Tue Jun 16, 2009 11:44 pm

I don't get tired of the exhaust. For me, it's a combination of the exhaust and wind on my helmet. If it weren't for the wind noise at 60+ I could deal with the sound of the exhaust.

Firewa11 · Post by **Firewa11** » Wed Jun 17, 2009 8:50 am

To get back on track and answer your question, the purpose of a power commander is to better flatten out all of the peaks and valleys you have in your horsepower graph (dyno).

When you have a stock exhaust, headers, etc, the fuel / air ratios are finely tuned for that configuration. When you change something, such as the pipe (which a lot of times also takes out the catalytic converter), headers, etc, the fuel / air ratios are no longer valid. The back pressure is going to be a little different, and your dyno graph will probably go from a nice fluid curvy line to something a bit more erratic. What this means is that when you're getting on the throttle, you may have dips or peaks in horsepower where you didn't before. Honestly you may never feel the difference. I could on my GSX-R 750, and when I put a better map on, it cleared out the sudden power drop and spike I had between 8200 and 8600 rpm.

Going back to what everyone said, this does not mean that you have to install a PC. Really what it boils down to, is it worth the extra $$$ to you for a less erratic and more smooth power curve on the throttle, potentially a few more HP (like 1-5), and a cool little box that you can hook up to a laptop and play with your fuel / air mixture?

I personally have a PC on my race bike, but since I'm running stock on my street bike, there's no reason for me to put one in. If I changed out the can, I would probably install a PC not too long down the road.

Post by **DarcShadow** » Wed Jun 17, 2009 11:16 am

you could always change it out, and then if you notice some weird peaks or dips in power have a PC put in later.