You can't even "maintain" any car for free... On the 86.5 NA I had, I installed some PaceSetter headers, and used an Unorthodox crank pulley and it "seemed" to do better. Best thing you can do is just start saving up for an eventual engine swap, if HP/performance is what you're after.... lots of choices these days... 7M-GTE, 1JZ, 2JZ, etc.
No matter what, there are no "free" performance upgrades for the NA. Good luck!
No free performance upgrades... but there's free stuff u can do to make the car faster. For instance gut the interior, remove ac, remove ps, get better at driving??? Visit the $20 or less mod page in the FAQ.
Owning a supra while ur broke isn't gonna work.
BTW What Satan said is absolutely true, you cannot even MAINTAIN a car for free. If you just got the car you shouldn't be thinking about performance upgrades... you should be thinking about changing all fluids, new tires, alignment, etc...