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Originally Posted by ananthkamath Could it be something known as MHP- Mental Horsepower? 
I dont believe anything unless I see the numbers. Or quarter-mile times. Or in-gear acceleration times. Or dyno readouts.
Since you want an explanation:
(1) to (2) - you lost velocity by removing the cat. Ergo, you lost torque. Notice the cat has tiny perforations like a honeycomb. That increases velocity.
(2) to (3) - you lost velocity by going to a bigger center pipe. Hence, you lost torque.
(3) to (4) - you say that dia was smaller. You gained velocity, so you gained torque.
(4) to (5) & (5) to (6) - can't comment unless i saw the muffler myself.
If only you had changed the header along with all the other parts. You would have ended up spending less money & gotten more power. Unless your aim is to experiment, not unlike me.
The muffler is the least important part of the system. Although a bad design can still undo all the gains from the header. |
but as per what u have written "you gained velocity so you gained torque" doesn't it mean the same thing .. since I had the free flow muffler I had a lower back pressure so gasses could flow freely and unrestricted so they could flow at a higher velocity .. doesn't it mean the same thing ?? let me know what you think ..
you also mentioned "cat has tiny perforations" that increases velocity ... this statement holds true only if you are comparing it to a badly designed gutted cat (like an empty can).. but in my case I had removed the cat and put a straight thru pipe.. so in my case the
straight thru pipe allowed a drop in pressure as compared to cat with tiny holes which blocks up the exhaust system and increases the pressure build up... so in this case as I had no cat there was low pressure and so the gases could flow with a greater velocity .. isnt it the same thing ?
u also mentioned "dia was smaller. You gained velocity, so you gained torque"
doesnt it mean the same thing that since the dia was smaller the exhaust system allowed a bigger build of pressure so the velocity at which the gases flows reduced..
isnt this statement right for my case : gasses can flow with greater velocity if the muffler + straight thru large dia pipe is allowing a lower back pressure build up..