no one has answered my thread but how I'd back pressure affected? Is it affected from your afr I was looking into making a custom pipe which I now am not because I am planning on getting yosh Japan from griffind. Anyways how important is how long the pipe is have to do with back pressure for instance if you made a shorty pipe come up onto the passenger peg do you just change the afr readings or is there more to it.
there is no such thing as actual back pressure.
what there are is resonant waves. Those resonant waves are tuned by the length and diameter of the canister. As the pressure waves from the exhaust hit the canister, they expand, when they expand they slow down (which is what some people call back pressure, as they start to stack up in the canister) and part of them is reflected back by the inside and the end cap of the canister. Those resonant waves effect exhaust pulses and how power is made.
Air fuel ratio has nothing to do with that, although it can effect your air fuel ratio... does that make sense? AFR doesnt affect it, it affects AFR.
so although if you were to take a shorty canister (or chop one making it into a shorter length than it was originally designed) it can be made to work after properly tuning air fuel ratio, that doesnt mean it will make power anymore. In fact it can lose power. The canister length is critical to how it is tuned an how it makes power. Altering that changes it outside of its parameters and very well can make it worthless other than being louder.
This is the same as why we often say how shit pipes are shitty. They are nothing more than a glass pack,but have no R&D or tuning behind them, and as such often make WORSE power than stock. They just make noise, nothing more.
What thread and Ill copy this there