Removing baffles and back pressure

[Lexcruiser]

Would removing the baffles on the stock exhaust system negatively affect the backpressure to the engine, thus degrading performance?

Seems thats a good way to get a 'richer' sound from the stock system. I thought about it, but wouldn't want to rob the engine of some performance...

Whats everyone think?

[nhoel]

never like the idea of modifying the stock parts... Think about it, the part was designed that way and it should operate that way. Save up and make an investment in new pipes and a fuel processor kit...

[DrBob]

Removing the baffle sgenerally only makes more noise, and usually hurts performance. Some stock pipes can be modified and you will see an increase in performance, and with some you can remove the baffles and change the jetting and you will see a performance increase...but without knowing what bike you have I can;t be more specific.

[Jerryzuki]

I just removed my baffles Saturday. I was looking for a drop in performance. But if anything I actually gained some on bottom end. I know it sounds crazy but I took a pretty long ride 2-up Sunday and it feels and sounds great. By the way, I did call my dealer before doing it. He said that it wouldn't affect my warranty.

Opening up the exhaust, is opening up the exhaust, whether it is done by de-baffleing or by putting pricey after market pipes in my opinion.

[Uechi Kid]

Removing the baffles does help the bike to breath better. It makes the air fuel ratio more lean. The danger is if it gets to lean.
I just repleaced the intake and exshaust and put on a powr commander fuel controler. I also had it dyno tuned. I gained 18% more hp. buy doing all that. Cost about 2k. Was it worth it. You bet. If you can afford it, do it right.

[Jerryzuki]

Originally Posted by Uechi Kid

Removing the baffles does help the bike to breath better. It makes the air fuel ratio more lean. The danger is if it gets to lean.
I just repleaced the intake and exshaust and put on a powr commander fuel controler. I also had it dyno tuned. I gained 18% more hp. buy doing all that. Cost about 2k. Was it worth it. You bet. If you can afford it, do it right.

I was wondering if anyone ever put these things on a dyno. So If I gained 18% on my C50T, I could get 9 HP for $2000.00. That's $222.22 per horse!

[Uechi Kid]

I also didn't do the installation of the parts either. I've gotten a bit lazy these days.
so you can save your self some money that way.

[nhoel]

Ok, that explains it... i was wondering about the price getting too high... with the parts you installed, you can't go over $1.2K (even if you picked the expensive exhaust). But still... "ouch" for the overall cost.

[chadrob30]

I drilled 3 holes in each baffle and now have a low, throaty, bass sound when idling. It sounds awesome under acceleration....and unless it's my imagination, I gained some low end....

[AceBiker]

What size holes did you drill? While I'm on this thread about back pressure let me say this, all 2 strokes need back pressure, 4 strokes require very little if any at all.

[Jerryzuki]

Even though I removed the baffles, it is still not a straight shot. There are two more plates in the pipe. I think (hope) that is enough back presure.

[Pinhy]

i had drilled 3 in each then went to 5 on my stock, didnt really notice anything except a little more "gurgle" type sound when accelerating mostly.

no notice on performance or anything else.

.

[DiZmAc]

There are actually a few bikes that will run richer when the pipes are opened up.

You should do a plug check at different thrrottle poitions to see how your mixture was affected by punching your baffles. If they're anything other than tan, you better fix it. Especially if they come out white.

I agree with most of the guys in here about buying aftermarket pipes. They'll generally sound better than punched stockers and sometimes you can find a manufacturer that can sell you a matched set of pipes, jets, and filters. All for under a grand.

[Clint]

Originally Posted by DiZmAc

There are actually a few bikes that will run richer when the pipes are opened up.

Say wha? You'll have to elaborate on that one.

[DiZmAc]

Some bikes that are originally tuned for torque usually have a particularly restrictive intake, one that produces an effect like a venturi but in response to certain frequencies of pressure waves. Couple that with a pipe setup that isn't tuned to provide proper scavenging at the same rpm as the airboxes are, and you get richer mixture. It's a tuning querk. That richness mostly occurs at the lower to mid range rpms. @ high rpms you would lean out.