i have a 95 eclipse rs and when driving it its real sluggish when accelerating, like, around 2000 to 2500 rpms it begins to gain some power, i have been trying to diagnos the problem but its not workin to well......if some one can help me out and give me some suggestions on what to do or what man be wrong please let me know!!! :confused:

Did you recently install a "performance exhaust"?

no, everything (engine wise) if factory so far. the only mod is a new intake FILTER only and the muffler was removed and replaced with a straight pipe/tip.

the muffler was removed and replaced with a straight pipe/tip.
thats probably why...

no, everything (engine wise) if factory so far. the only mod is a new intake FILTER only and the muffler was removed and replaced with a straight pipe/tip.

As CRX has stated, that's probably why. An engine works by burning air and fuel to push the piston down, and needs a certain amount of back-pressure on the exhaust to continue pushing that piston down for your low-end torque. By removing the muffler and replacing it with the straight pipe, you removed that backpressure. This means the engine can rev higher, more freely, and will have a little more top-end, but you sacrifice all of your bottom end torque.

thanks! do you have any suggestions on changing this or would the only thing i can do is change the exhaust set up, and would it cause that on any motor because im hoping to do a motor swap either this winter or early next summer.

As CRX has stated, that's probably why. An engine works by burning air and fuel to push the piston down, and needs a certain amount of back-pressure on the exhaust to continue pushing that piston down for your low-end torque. By removing the muffler and replacing it with the straight pipe, you removed that backpressure. This means the engine can rev higher, more freely, and will have a little more top-end, but you sacrifice all of your bottom end torque.

i hate the use of those words, back pressure. i'd rather say exhaust velocity

either way, before the exhaust bit was told, i was wondering if maybe the car was run hard and had jumped a tooth

not sure but ill have to check it all out. j/w if you have suggestions?

Year: 1995
Make: Mitsubishi
Model: eclipse rs


There is your problem

thanks! do you have any suggestions on changing this or would the only thing i can do is change the exhaust set up, and would it cause that on any motor because im hoping to do a motor swap either this winter or early next summer.

The only thing you can do is keep a stock exhaust really. Yes, it will cause roughly the same issue on any motor you can fit in an Eclipse. People install "performance" exhaust systems, but that's to gain top-end and high-revving horsepower, at the sacrifice of low-end torque.

Year: 1995
Make: Mitsubishi
Model: eclipse rs


There is your problem

Agreed. Even a turbo model has problems with low end torque. It's called turbo lag.

Year: 1995
Make: Mitsubishi
Model: eclipse rs


There is your problem

what ever man!! it looks good now, and thats all im really worried about at the moment, i have the whole winter to work on the engine!!!! :biggrin:

its a 420a, dont even touch the engine. its the same motor that comes in the dodge neon. piece o shit.

How much extra weight do you have in it w/stereo equipment, aftermarket dubs, body kits..etc on an otherwise stock N/A engine?

what ever man!! it looks good now, and thats all im really worried about at the moment, i have the whole winter to work on the engine!!!! :biggrin:

translation...."i've wasted a whole bunch of money on a worthless car"

its a 420a, dont even touch the engine. its the same motor that comes in the dodge neon. piece o shit.
Wrong. All rs model Eclipses are 1.8L mitsubishi engines. The 420a is a 2.0L Daimler-Chrysler engine. The 420a was in a good portion of the GS model eclipses.

wow..4g63 N/A.....

A 4G63T engine is just like a Rotory... All the reliability (none....) and none of the power

Wrong. All rs model Eclipses are 1.8L mitsubishi engines. The 420a is a 2.0L Daimler-Chrysler engine. The 420a was in a good portion of the GS model eclipses.
look dumbass you are always saying you know about mitsubishis and keep saying im wrong about stuff. you could not even get any 1995 eclipse with a 1.8. only the 420a and the 4g63(4), get your facts straight before you tell me im wrong again.

From Wikipedia;

First Generations (1990-1994) cars:
** 1990 1994 DSMs did not come with the 420A engine, which was not added until the second generation.

Second Generations (1995–99) cars:

* Eclipse: Base FWD model equipped with a 140 hp 2.0 L 16-valve DOHC Chrysler 420A engine
* Eclipse RS: Equipment Upgraded FWD model equipped with a 140 hp 2.0 L 16-valve DOHC Chrysler 420A engine
* Eclipse GS: Equipment upgraded FWD model equipped with a 140 hp 2.0 L 16-valve DOHC Chrysler 420A engine
* Eclipse GS Spyder: Convertible FWD model equipped with a 141 hp 2.4L 16-valve SOHC Mitsubishi 4G64 engine
* Eclipse GS-T: Hardtop FWD model equipped with a 210 hp turbocharged 2.0 L 16-valve DOHC Mitsubishi 4G63 engine
* Eclipse GS-T Spyder: Convertible FWD model equipped with a 210 hp turbocharged 2.0 L 16-valve DOHC Mitsubishi 4G63 engine
* Eclipse GSX: AWD model equipped with a 210 hp turbocharged 2.0 L 16-valve DOHC Mitsubishi 4G63 engine

further proving my point