Removing baffles... how loud is it

[nicocorea]

With just the baffles removed (mickeys and cyclopses still in place) there was no noticable effect on power. It was when I removed the mickeys and the cyclopses that I lost all that top end power.

[07M50Limited]

Originally Posted by nicocorea

With just the baffles removed (mickeys and cyclopses still in place) there was no noticable effect on power. It was when I removed the mickeys and the cyclopses that I lost all that top end power.

It should of been the reverse of that...with straight pipes top end (RPM)should be better, and low end torque gone...with baffles better low end torque and less high end RPM's, do you have a fuel processor?

[lewie]

hi i got a m800, standerd pipes were to quite, so what i did was got a half inch long steel rod & a club hammer, pushed it up the exshaust when it touched the 1st baffle plate punched it thur, felt the 2nd plate and done the same, repeat on 2nd exshaust , got a nice sound now , no loss of power, no need to adjust the f1, no power commonder needed, hop that helps..

[nicocorea]

Originally Posted by 07M50Limited

It should of been the reverse of that...with straight pipes top end (RPM)should be better, and low end torque gone...with baffles better low end torque and less high end RPM's, do you have a fuel processor?

Yes, I have the PCIII and I tried several different maps.

It'd be great if someone could further explain the relationship between backpressure and torque that you alluded to. I mean, why would reducing backpressure shift the torque curve towards higher RPMs while increasing it shifts the torque curve towards lower RPMs?

[nicocorea]

Originally Posted by lewie

hi i got a m800, standerd pipes were to quite, so what i did was got a half inch long steel rod & a club hammer, pushed it up the exshaust when it touched the 1st baffle plate punched it thur, felt the 2nd plate and done the same, repeat on 2nd exshaust , got a nice sound now , no loss of power, no need to adjust the f1, no power commonder needed, hop that helps..

I'm having trouble picturing that. How did you reach the second plate (not to mention the third) with a 1/2 inch long rod? So you have two loose plates rattling around in each pipe?

[07M50Limited]

Originally Posted by nicocorea

Yes, I have the PCIII and I tried several different maps.

It'd be great if someone could further explain the relationship between backpressure and torque that you alluded to. I mean, why would reducing backpressure shift the torque curve towards higher RPMs while increasing it shifts the torque curve towards lower RPMs?

Back pressure , gives you low end torque...long lived lesson of drag racing,
straight headers , didn't work as good as collector's ...and the guy off the line with the low end torque...takes off...its hard to win...when you play catch up

[Trigger1985]

Originally Posted by jkulysses

After removing my baffles I can hear the exhaust at any speed with a full face helmet on.

Odd thing is I can hear my exhaust better with a full face, than I can with naked ears... I don't understand but I don't mind... my debaffled sets off car alarms in the parking deck at work, but they just maybe set sensitive, with all the hit and runs and all (at an insurance company no less)

[RicVARider]

Sorry been away for a while.

You can test this, but making some round plates, to cover the holes, and attach them with a couple sheet metal screws, they dont have to seal completely to increase the back pressure.[/quote]

Thats a good tip, just need the right metal and hole saws to do this.

Originally Posted by 07M50Limited

Now I dont use Amsoil, I use Rotella, but this page has lots of reasons you can see diffrences in your MPG...even with Syn.
Fuel Economy Improvements with Synthetic Oil

Mixed feelings is true! I will have to look into this, b/c I am always looking to better my MPG.

Originally Posted by 07M50Limited

I told you...Mixed feelings...but I swear by it...But did you do a oil change, around same time?

I did not change the oil at the same time. I did change the oil later b/c I was getting like 43MPG and it helped, but I still haven't reached 50MPG. I would like to avg that! And I still wonder if going to the full baffle would decrease the MPG even more or not!

[dispatchbob]

I just completed a ride today, two up - between us it is about a 350 pound load - but don't tell my wife I said so. I debaffled my bike a couple of months ago. Sounds much nicer, really the only time it seems a bit loud is at initial startup when revs are higher but just a nice mellow sound running down the road. Certainly not obnoxious by any means. I averaged on todays trip a touch over 55mpg and sometimes hit nearly 60mpg with it. Seems to be more the quality of fuel than any other factor that causes the variation. No difference in mpg before or after I debaffled mine. Have 2300 miles on it now. Just the rear baffle removed on mine. Ride safe, Bob

[07M50Limited]

Originally Posted by dispatchbob

I just completed a ride today, two up - between us it is about a 350 pound load - but don't tell my wife I said so. I debaffled my bike a couple of months ago. Sounds much nicer, really the only time it seems a bit loud is at initial startup when revs are higher but just a nice mellow sound running down the road. Certainly not obnoxious by any means. I averaged on todays trip a touch over 55mpg and sometimes hit nearly 60mpg with it. Seems to be more the quality of fuel than any other factor that causes the variation. No difference in mpg before or after I debaffled mine. Have 2300 miles on it now. Just the rear baffle removed on mine. Ride safe, Bob

I agree, you never know what they have done to the gas, and I think it also has to do with how the bike was broke in, and how many miles are on it..there is just a big difference, between alot of our bikes with gas mileage....Maybe it has to do with the color,

[07M50Limited]

Originally Posted by RicVARider

Sorry been away for a while.

You can test this, but making some round plates, to cover the holes, and attach them with a couple sheet metal screws, they dont have to seal completely to increase the back pressure.

Thats a good tip, just need the right metal and hole saws to do this.

[/quote]
You dont need a hole saw!!!
Save yourself some money, just go to the hardware store, look around, and find some thin metal to test it...stove pipe, gutter stuff..door kick plates..yard signs...LOL(Im sure you will see lots) .. draw a circle and cut it out with some tin snips.

[RicVARider]

Originally Posted by dispatchbob

I just completed a ride today, two up - between us it is about a 350 pound load - but don't tell my wife I said so. I debaffled my bike a couple of months ago. Sounds much nicer, really the only time it seems a bit loud is at initial startup when revs are higher but just a nice mellow sound running down the road. Certainly not obnoxious by any means. I averaged on todays trip a touch over 55mpg and sometimes hit nearly 60mpg with it. Seems to be more the quality of fuel than any other factor that causes the variation. No difference in mpg before or after I debaffled mine. Have 2300 miles on it now. Just the rear baffle removed on mine. Ride safe, Bob

I am totally jealous!!!
So what other things have you done to the bike to help with mpg? What avg speed did you go? What type of oil do you use? I just don't see why I shouldn't get the same kind of mileage!!! So frustrating!!


[/quote]
You dont need a hole saw!!!
Save yourself some money, just go to the hardware store, look around, and find some thin metal to test it...stove pipe, gutter stuff..door kick plates..yard signs...LOL(Im sure you will see lots) .. draw a circle and cut it out with some tin snips.[/quote]

Great idea!! Now with what Bob said, I just want to rip out the baffles and say the heck with it!!

[dispatchbob]

I use the dealership's factory 10w40 semi-synthetic oil, I averaged the same mileage with or without a Hellcat windshield on it. Average speed is about 60mph with occasional bursts to 75-80 just for the hell of it. I religiously check tire pressures and maintain the 29 front/36 rear pressures with factory tires ( check them couple times a week and always just before I take a longer ride). I doubt I've had the throttle over 1/2 way and seem to have all the pickup needed to stay out of trouble. I shift to second about 15mpg, go to third at about 25, shift to fourth around 35-40 and go to high gear anywhere from 45-50. Usually run thru town in fourth gear if going 30mph or faster. Hope this gives you some help. Bob

[BlackOutSi]

Back pressure , gives you low end torque...long lived lesson of drag racing,
straight headers , didn't work as good as collector's ...and the guy off the line with the low end torque...takes off...its hard to win...when you play catch up

Sorry I just read this, now to stir the pot a little. Air velocity makes the torque, not the backpressure. It's also possible to lose torque while gaining HP and feel a definite slowdown at highway speeds.

The downside to picking up air velocity at lower RPM is that you restrict too much at higher RPM, hence the dual runner intakes and variable valve lift systems that a lot of motors use now. This gives you the best of both worlds...a good example is the intake on Acura GSR's from the late 90's, and on bikes, the Kawasaki Z1000 exhaust. The Kaw's exhaust is ported into 2 mufflers for low end torque and a valve opens up to 4 mufflers at higher RPM to make the most possible torque across the band while maintaining a little backpressure.

Airflow is a neat science, I learned a lot when I ported heads and got to test them on the flowbench. You have to find a balance between low end power and top end power and it's very tricky sometimes.