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View Full Version : Differences between FX 3.5l and QX4 3.5l engines??


leeqx4
05-14-2003, 11:50 AM
I got a 02 Qx4 with some mods (stillen Hi-flow intake and full Cat-back exhuast setup, NGK plugs and performance tires), I am trying to get more power out of the 3.5l block. The FX35 has the same block as the all other nissans but there's got to be differences somewhere that can be tweaked to get more power ala FX power curve.

The qx4/pathfinder both have .....
240hp@6000 rpm and 265tq@3200 rpm
Variable-Flow induction system
compression ratio: 10.0:1
curb weight:4352 (without driver)

FX35...
280hp@4800 rpm and 270tq@4800 rpm
High-flow induction system
compression ratio: 10.3:1
Curb weight: 4202 (without driver)

I had an experience with one of my salesman friends who has a black FX35 as a demo vehicle and we did a few runs against each other. With my measily mods I was demolished off the line, but after about 60 my mods shine. I was stilled walked by about 2 cars but I really made up some ground. I am thinking with the FX35 engine modifications, and my mods, the the qx4 will be a better all around SUV. I am not looking to replace the QX4 yet with the FX but I want the power from the FX line. What needs to be done to tweak performance???? I am not a mechanical engineer so I am completely clueless, However, I do have the time and some money to get the modifications done.