I know that with a lot of engines there's points past the break-in point where they gain some extra "oomph" is there a point like that with the VQ35 in the Z or is it at peak after the 1200 mile period?

 

It's at its "peak" with however many miles you get it with.. whether it's 12, 1200, 12,000 etc. My co-worker dyno'd his car with 30 something miles on the odo and put down more power on the dyno than mine did with a religious, 1200 mile break-in that invloved no revving above 3500. Now maybe my engine will last longer, or his HP will fall off because he didn't break it in, but I doubt it. Back to your original question, there's no "set if free!" point where the full potential of the engine is released after a certain mileage.

 

the motor is run in the factory before you get your car... there really is no break in period...

 

You know this for a fact? If so may I ask you for your resource? I also don't think that break in is nessesary but I am not 100% sure and would love to find some official conformation.

 

Well, he does work for the Nissan dealership, so......

 

He's right. Some of the Nissan plants allow public tours, I did one at a plant in Japan. The cars go off the line onto some rollers for a test. I don't know the details of the test (ie. how high they rev, throttle position etc), but i highly doubt you can purchase a new car that has never been rev'd up before you. I'm more worried about breaking the tranny in than the engine..