how to tune 94 eclipse gs

i need help on engine mods for my eclipse. i need to know the best way to get more power out of my 420a without spending mega bucks please help..  
94 eclipse gs

Sell it and buy an eclipse with a 4g63 T. Preferably an AWD GSX eclipse.  

OR, buy some bolt ons that will improve the car, such as an intake and exhaust because if you don't wanna spend mega bucks you definately don't wanna look at a 4g63 eclipse  

Check out dsmtuners.com for a good eclipse forum. They have a detailed performance guide.  
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http://rides.importtuner.com/ride/1076723/jimichanga/2005/honda/s2000/index.html

Only tune the Eclipse gs if making horsepower is not something you want to do.

The 4g63NA in the 94 eclipse gs is not meant for making much more power than stock and really pales in comparison to the 4g63T. Also even if you did some huge build that cost thousands of dollars to make 400whp or so, you would still have trouble getting all the power to the ground due to the inferior FWD drivetrain setup on it.

If Im wrong, then check out the quartermile time slips on dsmtuners.com and argue with the fact that 24/25 fastest DSM's arent FWD.  

so what, he obviously doesn't wanna spend tons of money doing a swap. the point is to give him advice on how to upgrade his motor, not tell him its crap  

Yea but he stated in an earlier post that he planned on putting in racing seats and doing an AWD swap down the road. No matter what thats going to involve buying a GSX somewhere in his tuning plan so Im telling him that if he wants to get into tuning he should buy the much more tuner friendly GSX eclipse that comes with a stout 4g63T than attempt to make his 4g63NA fast at all.  

tuning would not be needed on a mildly upgraded gs motor, the ecu has a closed loop for driving that isn't WOT so you wont' be able to tune anything unless its WOT.  WOT is when the ecu now starts taking reading from various sensors in the exhaust system pre and after cat o2 sensors, and your MAF attached between your intake and the throttle body.  The stock ecu is more then capale of compensating for the extra air flow with mild bolt ons.  You would be able to make a little more power with a safc by leaning out the fuel @ WOT but its not going to make much of a difference, just fixing the dips on the dyno.

EDIT:  If the OP really is considering doing a gsx swap, he is going to need a donor gsx to get the parts to make it happen.  Lots of things to have to change due to the drive train gettin in the way.  YOu need a gsx exhaust, gsx fuel tank, gsx rear suspension, gsx axels, gsx transmission, and the motor it bolts up to.  Its been done before but not to often because of the cost and labor needed to do the swap.  

Are you high?  The ECU is ALWAYS taking readings from the O2s and MAF sensors.  They are the sensors that tell the ECU how much air is on the way and how much air is in the exhaust in order to create ideal air:fuel ratio.  It would be completely useless for them not to function until WOT...

Also, if he needed a donor GSX, would it not make much more sense to just fix up the donor rather than doing all that work???

Sometimes I wonder why people bring their questions here.....  Because most of the time people give them really bad answers...  
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16psi on stock turbo and fuel, ARP Head Studs, 3" Turbo back, Greddy BOV, SBR 3500 Clutch Kit, 11lb Chrommolly Flywheel.
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Daily: 2000 Honda Accord Coupe F23A1 VTEC
Project: 1995 Eagle Talon TSi AWD

Actually you guys are both wrong. Read about open loop vs closed loop systems here.

http://hondaswap.com/general-tech-articles/open-loop-vs-closed-loop-ecu-modes-3357/

The stock ecu has preset base maps til a certain percentage of throttle opening, and when it sees that the throttle body has been opened to that certain percentage, it starts taking readings from sensors from the MAF, the o2 sensors and the knock sensor. Then constantly calibrates the readings, in an appropriate amount of air/fuel ratio.

I also want to point out that Nismo had mentioned that these sensors work all the time and are completely useless if so much as one stops working, but when someone gets a bad o2 sensor or knock sensor, the car doesnt become completely immobile because its sensor is no good anymore, the car goes back to a preset map in the ECU to allow it to continue to run even with a bad sensor.

And of course it would make more sense to fix up the GSX Eclipse than to convert a GS Eclipse to a GSX, but the man specifically asked about turning his GS Eclipse into a GSX, and he gave him the correct answer that he would need a donor GSX car to do it with.