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Hi friends, my name is Simon I from Chile. I have a Nissan Primera p11 with swap sr20ve + n1 cam + 20v header exhaust and nismotronic nemuv2 ecu.
I took my car to the dyno and it got 188,8 whp/130lb tq, but the hp curve/torque falls abruptly when cam n1 active (5.000 rpm).
I don't know what is the reason, it may be a bad installation of the cams, exhaust downpipe 3", or tuner. Someone in the group could guide me
 

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if* its tuned properly (right timing, right fuel) then the first thing to do is raise the rpm switch to both @ 5500rpm, or say 5200 intake/ 5800 exhaust and see if that helps. otherwise its something else. real torque curves are seldom dead flat, by they should be pretty consistant until 7k with the factory intake manifold.
 

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