Gotta be honest, most of the above suggestions may improve top-end power, but won't do much for low-end torque.
A shorter diff ratio will effectively give you more torque at the back wheels, but at the expense of cruising economy.
You also need to consider your exact needs, because unless you have a load in the back, your ability to use that torque will be limited by your tyres.
You can tweak it a bit with a tune, but keep in mind that all you're really playing with is ignition and fuelling.
Quote:
Originally Posted by castellan
If you want more torque change the cam, as that's the heart of the engine that rules such things.
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Correct, if you really want to change the profile of an engine, the cam is where you start. I would imagine there are a heap of different options available ex-US (just make sure you look at roller cams).
Beyond that, the best way to boost low-end torque is with a small super-charger.
