The truth about removing cat vs. increase flow
#101
#102
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Old New Rider (02-15-2023)
#103
just curious...did you retune after mod, and did you consider adding the Cool Flow fan instead? wondering what felt heat differences might be between cat removal vs cool flow fan... guessing it may be pretty close, and cost wise less expensive adding fan vs buying tuner and Dyno'ed
#104
This is a myth. Engines do not require back pressure to create torque. In fact, they have backpressure limits to prevent excessive loss of torque, and overheating.
Harley doesn't have a magic combustion process different from any other hydrocarbon burning engine. My experience is with development of turbocharged diesel engines, but a number of exhaust suppliers here I've talked to have derided this myth as misinformation.
Harley doesn't have a magic combustion process different from any other hydrocarbon burning engine. My experience is with development of turbocharged diesel engines, but a number of exhaust suppliers here I've talked to have derided this myth as misinformation.
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Old Ranger (02-15-2023)
#105
This is a myth. Engines do not require back pressure to create torque. In fact, they have backpressure limits to prevent excessive loss of torque, and overheating.
Harley doesn't have a magic combustion process different from any other hydrocarbon burning engine. My experience is with development of turbocharged diesel engines, but a number of exhaust suppliers here I've talked to have derided this myth as misinformation.
Harley doesn't have a magic combustion process different from any other hydrocarbon burning engine. My experience is with development of turbocharged diesel engines, but a number of exhaust suppliers here I've talked to have derided this myth as misinformation.
#106
This is a myth. Engines do not require back pressure to create torque. In fact, they have backpressure limits to prevent excessive loss of torque, and overheating.
Harley doesn't have a magic combustion process different from any other hydrocarbon burning engine. My experience is with development of turbocharged diesel engines, but a number of exhaust suppliers here I've talked to have derided this myth as misinformation.
Harley doesn't have a magic combustion process different from any other hydrocarbon burning engine. My experience is with development of turbocharged diesel engines, but a number of exhaust suppliers here I've talked to have derided this myth as misinformation.
It's not a myth. Talk to Fuel moto.. With M8 they even see a HP / TQ gain by adding back pressure with certain cams..
I've seen torque go down and HP go up with baffle removal some bikes and the opposite on others.. I have examples of both..
The thing is that it really pretty much depends on everything but mostly cam, compression and exhaust design. If all you are only looking at flow you'll fail.. You have to look at exhaust tuning.
When you turbo charge, it's a whole different ball game..
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teedoff65 (02-17-2023)
#107
It's not a myth. Talk to Fuel moto.. With M8 they even see a HP / TQ gain by adding back pressure with certain cams..
I've seen torque go down and HP go up with baffle removal some bikes and the opposite on others.. I have examples of both..
The thing is that it really pretty much depends on everything but mostly cam, compression and exhaust design. If all you are only looking at flow you'll fail.. You have to look at exhaust tuning.
When you turbo charge, it's a whole different ball game..
I've seen torque go down and HP go up with baffle removal some bikes and the opposite on others.. I have examples of both..
The thing is that it really pretty much depends on everything but mostly cam, compression and exhaust design. If all you are only looking at flow you'll fail.. You have to look at exhaust tuning.
When you turbo charge, it's a whole different ball game..
Of course you have to look at the system. But increasing exhaust backpressure in general terms does NOT increase engine power output. Period.
#108
First, FM has some issues, ok? Like an "expert" advising you should only shift above 4,000 rpm. A muffler vendor expert on here said it is bunk, as did my own pro builder. There has to be enough backpressure to not encounter reversion, but that is dependent on the diameter and length of each pipe.
Of course you have to look at the system. But increasing exhaust backpressure in general terms does NOT increase engine power output. Period.
Of course you have to look at the system. But increasing exhaust backpressure in general terms does NOT increase engine power output. Period.
What about over exhausting? One of the things to note is that you can build a pipe that works perfect but 90% of the time that pipe won't fit..
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FLTRI17 (02-17-2023)
#109
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lp (02-17-2023)
#110
I thought we were all pro builders here.. So you dis FM because he said something you disagree with? and I supposed to take your word for it?
What about over exhausting? One of the things to note is that you can build a pipe that works perfect but 90% of the time that pipe won't fit..
What about over exhausting? One of the things to note is that you can build a pipe that works perfect but 90% of the time that pipe won't fit..
and I wouldn't call a single company a sole leader wither.
I've been in engineering 32 years. It's not true. You guys "believe" what you want to.
I'll listen to those on here talking physics and have test data.
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Just Cruzin' (02-20-2023)