What would u guys do to make a 03 spyder eclipse GT faster? Would you recommend a turbo or what? let me kno...im a lil low on the cash flow tho so take it easy.

Depends how much faster chief. Gives us some goals.

you can always go for the little stuff to start, intake, exhaust, spark plugs/wires, but if you're looking for serious power you're looking at a couple grand. a guy called bullet_bike_syke69 pointed out carpart.com for some cheaper used parts, but for the love of god stay away from ebay

better find a money tree, cuz mods are not cheap for this car.

Well I do know that if you're planning on turbo you might want to get stronger internals, maybe from a 3000GT, because the internals that are in the eclipse GT's are weak and can only handle about 250hp on the stock internals(of so I've been told by friends that own them and have looked into that.) But yea I'd go intake, exhaust, fuel system, plugs/wires, and so on. But nothing is cheap like has been said before.

just so you know if you put in a full high flow exhaust you will lose power not gain it. high flow exhaust is meant for turbo applications as the back pressure your car needs applies because your turbo needs to spool up and the pressure it takes to spool that turbo up helps your engine. tossing on a high flow exhaust system takes nearly all your back pressure out of your combustion cycle. until you decide to put on a turbo or turbo's do not go full exhaust.

headers already tend to make the GT 's run super lean causing more fuel to be pumped than can be burned. that just bogs your engine down, because in theory a perfect combustion environment is 14.7 to 1 air to fuel ratio. if your vehicle just kicks it up by half turning it 14.7 to 1.5 you then have a less than perfect air to fuel ratio causing your car to not only have crappy MPG but in turn taking HP rather than adding. is that something any one would want? less hp and more fuel consumption? i didn't think so. if you decide to do exhaust you can put in a short pipe header set but i would recommend not until you buy a turbo system and then you will have a turbo header system, then the rest of your exhaust can follow. putting in a high flow cat without a turbo setup will just screw your whole system.

i suggest you just make a bolt on high flow muffler they are easy to make with your piping you already have. that is until you can do the turbo kit then you an put on a high flow cat. that is unless you want to start just barely beating a G3 eclipse RS. i knew a guy who did that, tossed on a full high flow exhaust in his GT and he beat me in a 1/4 mile race by about a car length. when he crossed, my front bumper was at this rear bumper. thats pathetic considering he is supposed to have 50+ more HP than my little 147 HP and his car was the same body styling as mine not the Spyder. we both have intake i have a high flow muffler he had full exhaust. and he even has the ever so sought after 5 speed sport tronic automatic in the GT's his is 2004 GT mine is 2001 RS.

Well I never said that you had to do a full exhaust system, like in my case I simply put a flowmaster deltaflow muffler on my 03 GS. and I have a K&N typhoon Short Ram Intake, because I knew a cat-back system would be pointless on my car. but I will agree with you that you lose horsepower if you put a cat-back system on without a turbo or super application. But I still stand by my point that if you are going to turbo the GT you do have to get stronger internals in there because they are not the same as were in the 3000GT. The GT eclipse can only handle about 250hp on the stock internals. So yea get a bolt on higher flow muffler for an exhaust until you decide to go forced induction.

All that matters is that with a gt or gts especially, you are screwed. If you want performance, you should trade it in for a 4cyl, and use the money you made on a turbo or super application.

theres actually some good information in this thread... I'm impressed.

GTP- I want you to get a pad of paper and figure out how much a week you can put in an envelop for modifications.

I want you to buy nothing for this car. Because once you buy one thing you keep on buying.. Look at me I bought a new mirror.... $2800 later I have a full turbo kit.. oops.

Once you have figured out a week subtract 20%, or multiply the number by .2 then subtract that from your total. anyway figure out what you'll have in six months.

Next decide what you actually want from your car.

I personally think the the GT's sound sweet stock, Add a short ram intake and even sweeter.

As stated above this platform is pretty much already maxed out. I don't suggest boosting this motor without dropping some coin into the motor first.

Selling is an option but then your stuck with a 4cyl and a turbo or SC app and reliability goes out the window.

Can you afford innsurance on a second car. Look at the 1G turbos...

Lets make it 25-30 mph faster. Sorry it took so long for me to reply. troubles at the house but its all good now. Thnks

For some reason i was looking in the woods of my house and i found a tree that looked very odd. i got closer and saw that there was money growing off the tree. Lmao... Jp

Let me piggy back on to this question, no attempt at hijacking it or anything, but lets say in the terms of this exhaust thing that a couple of you have brought up and the engine needing pressure from the rear. Let's say not so hypothetically that what I was looking for out of my gt was an emphasis on that sweet sweet rumble that my intake has already begun to provide me, and I find the concept of having the muffler only replaced not worth the time or money. For the bolt on cat back exhaust systems, are there ones that would keep the same pressure in the rear, at the very least not take away performance; and still add more growl to my engine? I'm not sure if that sounds stupid or not but I realize that my Eclipse is never going to be a race car, but I love the throatier sound that I get out of it than the four cylinders we own.

the only way i know of to get your car to actually go faster is add HP and kill your speed and rev governor with a jet chip or ECU flash.

here is the problem with turboing a GT, putting in a turbo kit is more work than the average person thinks or wishes to do. you can't just buy a turbo kit, bolt it on and go. it takes fuel upgrades and usually will call for engine internal upgrades especially on your 3.0L.

intakes are great for the GT. however a full exhaust, headers, high flow cat and cat back system will make your air/fuel run lean causing problems, usually in the effects of less HP and Torque. because your not getting any more fuel than what your original set is. to avoid this problem you have to get a jetting chip or get your ECU flashed for the setup but it will usually hit your fuel pressure cut off because you need more pressure than your stock pressure regulator will allow. also leaning out your vehicle tends to cause O2 sensors to burn our prematurely.

a high flow CAI or RAI due to the IAT sensor and your MAS they adjust your fuel pressure and flow to match the air that your engine intakes giving a normal air flow ratio. a O2 sensor monitors air fuel ratio efficiency. so if you lean it by means of exhaust. your computer will just read that it is less than perfect for the air fuel to burn. adjusting nothing, if it tricks the check engine code, it simply resets the settings then making your air fuel ratio back to a stock setting canceling out your IAT sensor and MAS readings altogether.

yes, you will burn less fuel and you can drive longer on a tank of gas, but it is likely to cause problems as well. it will make you lose HP around and about 20-30. and can prematurely destroy your emission controls like your O2 sensors and your knock sensors.

your best bet to adding in more horse power (without doing major upgrading) on a GT or GTS will likely be:
performance spark plugs most likely NGK iridium plugs
performance wires 8.5 NGK
MSD ignition distributor
Beck Arnley ignition rotor
lining up your spark plugs so that the open end of the electrode on the plug points towards the intake side of your engine head.
high flow Cold Air Intake
de-screen your MAS.
cat back without a high flow catalytic converter (unless of course you have a O2 sensor after your last cat. in that case just a high flow muffler.)
Walbro in tank 255 fuel pump
MSD high capacity adjustable fuel regulator
python 550 injectors
AEM high pressure fuel rail
a jetting chip or a ECU flash to these specific modifications

to get your HP and Torque to better transfer to your wheels you can do the following without tearing your engine completely apart.

cam gears
crank gear
under pulleys
light weight fly wheel
for manual transaxles the following 3
stage 2 clutch
light weight drive axles
racing transmission
for automatic, the GT's transmission can handle lot of HP and lots of torque. stick with the auto tranny you have, but upgrade the axles and the torque converter.)

anything else will fall under a more major type modifications. upgrade the diameter of the entire intake. (intake piping, MAF, throttle body, and intake manifold.)

port and polish your head, performance cam shafts, cam shaft bearings, valves, valve springs.

upgrading internals on your motor. high compression heads for non turbo application, design specific compression heads for turbo applications. lighter stronger crankshaft, lighter stronger connecting rods, lighter connecting rod bolts, complete sealed piston rings, bored out cylinder walls with steel sleeve inserts.

stand alone fuel management system with a laptop directly connected to your ECU and fuel system.

this is just my opinion on it. i'm letting you know approximately what you can do in the future if you decide to get into major modifications and what you can do that is generally easy mods to get to and do without tearing your motor apart. i hope this helps you and good luck with everything man.

Cut out catalytic converter,weld in same size as stock exhaust piping (same length as cat. was) I didnt seem to loose back pressure by doing that,but did notice a deffinate change in tone^louder!^plus I noticed slight hp torque gain.

your dreaming man. you didn't notice anything but the sound. no way could you feel a 3-5 HP gain if thats even what you got from pulling out your cat.(which happens to be illegal so we don't tell people to do it.)

PARTS NEEDED:
HEAD
Valves-
Dual valve Springs-
Retainers
Cams(optional)
shafts(optional for power usage)

Block
Forged Pistons
Forged Rods.
blue print the crank and get it balanced....May need to get custom forged.
NOT CHEAP

just for fun i'd pull out the motor and push it down a really steep hill. it would probably go faster then. LOL

uhhh, do you... what?


could you explain to me what a shafts is? and why is it optional. Or you could just tell me the truth and admit you get most of your information from Gran Turismo.

LOL...... thats what i thought when i read it too. maybe he meant you can switch the cam shafts and or the crank shafts and that they are both optional mods for turbo applications.

or maybe your right and he just gets all his modifying information from ps2 and ps3 video games. LOL its ok man people get caught doing it on here every so often. your not the first. now lets all group hug and sing some Coom-By-Yah:grouphug:

LOL...

I love n00bs.