Dyno numbers - 2.5inch Headers vs Stock headers

vsteel said:
I would say the data doesn't mean much because there were too many variables. To have real meaning you need to have a run, make the changes and then make the run again in a much shorter period of time.
Click to expand...
you mean quartermile?
 
The max torque for the original run was 145. The max torque on the recent run was 160. That’s a significant difference.
 
Less back pressure has improved throttle response. I may have missed the tune part but it sounds too rich now. The most important thing is, how does it sound?
 
dougl said:
The max torque for the original run was 145. The max torque on the recent run was 160. That’s a significant difference.
Click to expand...
As Stingray mentioned, could that 160 lb-ft simply be a momentary spike?
 
The last dyno i had there was a torque spike, a big one, maybe thats why i jammed my torsional damper? Lot of torque, 3 spikes actually, on every pull we were getting crazy torque numbers at the top. This package ate a torsional damper and then at end of summer ate 4th gear. I had a billet one in and trans shaft gears still broke.
 
I see that a lot on dynos. If you watch the engine HP at shutdown will fall off but the torque makes a large spike (after power cut). Was explained to me that the dyno drum is momentarily freewheeling, indicating false torque. Torque doesn't come from an unloaded engine.
 
alright, can some one explain why my gas consumption has increased by 30% with new headers and open exhaust? and my riding riding is same as before, nothing changed.
 
More air out, more air in, more air in, more fuel. Better cylinder evacuation, before it probably didn’t empty completely, thats why a good tune will dial in the timing and get the fuel right.
 
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