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Originally Posted by der Geist
Hey Der Geist, sure thing, yes, mine was a 3rd gear run. Yeah, I've wondered about my torque curve as well. I think my hp did fairly well for a pretty much stock 2.7, though my tq curve seemed a bit fluctuating. Any ideas/thoughts on why this would be?
I have no idea why they are so different. I found Randall's dyno after Che's headers & exhaust here: Performance Exhaust and Header for Boxster but his is a 2.5 so it's bound to be much different anyway. I think that we need a more experienced opinion here to answer that one for you. How bout it? I there anyone else who could post a comparison dyno or can tell us why that's fluctuating to that degree?
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Look at the range setting for different dyno charts. Yours is set to 0-225, Bisimoto's dyno is set 135-176. Bisi's is giving you a much more (5x) detailed look at the performance curve and is much more useful for performance tuning. Both charts give useful peak performance points.
The 2.7 motor max torque rpm has moved up from about 4.7k(stock) to 4.9K (chipped). It also looks like a narrowing of the torque curve(powerband). That narrowing of the powerband is where you get that extra "kick" feeling along with slightly higher max HP and torque. I'd say there is still some tuning work to do to get that nice big fat torque curve.
Below is the dyno chart Bisi did for his own 3.2 motor. The range setting is similar and it was the same dyno so you can compare apples to apples. It shows a fatter torque curve with higher max performance due to the larger 3.2 motor.
http://i4.photobucket.com/albums/y144/bisimoto/DeSnorked986S.jpg