I have a 91 NA and i want to get the most out of it while leaving it NA, yeah i know TT swap blah blah blah, not and option i want to leave it NA, so far the car has a cat back exhaust, pop charger, stage 2 clutch, one piece z1 drive shaft and test pipes on the way. I was thinking about a fuel injector upgrade, now most of my 15 years car knwoledge is in GM cars so im a little lost with this one, what types what size where to buy? Any help would be great.

 

changing fuel injectors to bigger injoectors aren't going to do anything to a factory car.. injector pulse is controlled by the ecu.. programmable ecu is a good way to remap the fuel system to change power outputs.. a FULL exhaust will affect power sometimes factory exhaust manifolds are restrictive so a set of headers will help the exhaust flow better. New intake setup will affect power. if you cant get it in cant get it out... you have to be carefull you don't unrestrict too much of the exhaust your car does need some back pressure to run properly. engine work is a good place to go.. port the heads smoother flow.. there is only so much you can do to an N/A car tho..

 

How to effectively get another 70WHP out of a vg30de.

Port heads, bigger valves, high seat pressure valve springs matched to the custom ground camshafts.

forged pistons with the block decked to achieve a 13:1, aftermarket rods and a complete hardware kit. Have rotating assembly lightened and ba;anced.

5.5" tripple disc clutch and lightened lightweigh flywheel.

lightened and balanced aluminum pulley set, full exhaust, TT injectors, 60mm TB's, HKS ignition amplifier, fully tuneable ECU, custom intake setup.

After all of that, you should be putting down about 250WHP. and cost about $5000 in parts and machine work.

The cheaper route is a vh45 swap or a TT swap.