Join Date: Jul 2003
Location: Smokin melb's eastern suburbs
First things first pick a fuel and work with that. Dual fuel systems are the worst possible setup. Neither one can ever be tuned to make maximum power.
I'm guessing its and auto with a standard ratio diff, both of these can be changed to help with the power delivery after it changes gear.
A 2500 rpm stall converter is cheap and easy and helps get the car into its power range off the line and every time it changes gear. A 3.45:1 geared diff does similar work but won't help a lot if your engine makes no low down torque.
A cam change is probably the first step and will cost a lot less than you might think, depending on how wild you go. Fill in a couple of cam reccomendation sheets some of the manufactures provide and see what they have to say. In all honesty a bigger MAF and injectors won't do bugger all unless there is a bigger cam to allow the extra fuel and air into the cylinders, in fact they will probably make it run worse.
Exhaust, well extractors are first on the list, a 2 1/2" system is as big as any non turbo 6 should need, really high performance engines might need a 3" but i'm yet to see a NA straight 6 make more power with a 3" system over a 2 1/2.
My personal preference would be to scrap petrol and go straight LPG, have the dizzy recurved for LPG and whack in a bigger cam ground to run striaght LPG, take the head off while your swapping the cam and have it shaved down to bump compression to around 10.5:1 (i cannot remember how much needs to be removed but a good machine shop will).
Slap in a 2500rpm stallie (around $300), a stage II shift kit and try getting the diff changed to a 3.23:1 or a 3.45:1 ratio. This plus a decent exhaust would have you kicking some serious ass around town while only costing you 35 cents per liter, what more could you ask for?
Just like a Tsunami.