Hi!
I'm somewhat in a bind on witch road to take and trying to gather as much information as possible.
The LS3 on a pure fuel economy would be a dead winner but the problem is it requires a ton of modifications before the government would approve of an engine swap like this over here... (Sweden)
So before I plow down a x amount of money in a project like an LS3 in a Firebird 2nd gen I'd like to know what the benefits would be vs taking the AI2 road and 535.
The LS3 would be a Corvette one at 480HP and 475 Torque. In order for me to get it legal I'd have to get the entire setup from a donor car including the catalytic converters and every adapter in the book apart from having to alter the entire front and rear suspension. (The front and rear suspension is a requirement for getting the car labeled as altered vehicle witch would enable me to be able to install a LS3 so as it looks like now it'd be about the same price as a 535 with rollers but with added work to the car)
The 535 would be specced for easy driving aka below 6000 RPM and idle like a baby cause that is what the car will live 98% of the time and jumping around in my seat at the stop lights isn't that much fun in my opinion. (So around 550-600 HP and torque) Carb I'd thought to use is a Quadrajet 800cfm one
The Transmission is a 200r4 prepped with a (lockup converter) for the torque and the rear has a 3.73:1.
So how much would I be seeing in fuel consumption on a 535 VS a LS3 with the transmission combo and rear and described?
Any input is appreciated even stuff not related to fuel economy.
Sven