Quote:
Originally Posted by johngriff
From the drawing board, engines are optimized using cam/valve timing for a specific length of exhaust.
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with a specific camshaft, head design, compression ratio and tune, yes.
But...with an EMS, high lift cams, and dyno time, you can tune for any length and style system your heart desire (maybe some machine work too).
I used a cut-out for drag apps back in the day. I had it half way down the exaust. It definitely had a negative effect on torqueand low end power but the higher ranges of the motor where exaust gas and movement of air was faster there was less effect and one a dyno more power.
There are plenty of people using t-cut outs on their cars for street racing or drag cars but if your doing a response oriented setup with anything other than a built head and ems, stick to a full length exaust with a muffler to meet your sound needs. It will be mroe beneficial for spool time scavenging etc.