I have a VQ35DE from an 03 G35 in my s13 240sx drift car. The car has always felt a bit slower than it should since I did the swap and struggled a bit to spin the tires in 2nd and 3rd despite the shorter gearing of the CD trans with the 240sx rear end relative to a Z or G. I did not have anything to compare it to power wise so I just left it be. I finally threw the car on a Mustang Dyno and it made 150WHP and 170WTQ, it made the same numbers in all the gears we ran. I see most people make 190+HP on a mustang dyno (they read low) with a stock DE in a g35 or 350z. I am trying to figure out what could be wrong. You would not know the car was low on power from the way it runs or drives, just noticeable for me while drifting.

There is NO check engine light for the knock sensor, cam sensors or a crank sensor. The MAF has been cleaned and it has a brand new air filter. All six cylinders have strong compression. The car does not have any sort of aftermarket tune besides an immobilizer delete for the ECU so the motor will run in the 240sx chassis. The car is not running hot, and never feels like it makes any different amounts of power (it does not seem like a heat soaking issue). The car runs fine and has no issues idling, on acceleration or under load. I have replaced all coil packs as well as the spark plugs multiple times. The exhaust is a straight-pipe with a single muffler, and no cats.

I am at the point where I am considering swapping out all the previously mentioned sensors I am NOT getting a CEL for and hoping that does something. However I understand it if any of these sensors where bad the car would be borderline un-drivable, which it is not. I figured I'd see if anyone had any ideas before I dump $500+ into sensors etc.

Also considering just buying a known running motor and throwing that in, but that seems like overkill for something that is likely a small problem.