04 auto WRX 1/4 mile problem

[Rgw2kx]

I brake launched my 04 4EAT (automatic) wrx at 2500rpm with a reaction time of 0.06 seconds and i am still getting constant 16.8s times. WTF???
i dont know what can be going wrong.
i have an HKS uppipe and performance muffler installed with a tranny cooler, i dont see why my quarter mile times are so slow. any help would be GREATLY appreiated.
from what i hear, the stock auto wrx's should be running mid 15's to high 14s times.

[sjcurtis]

Reaction time has nothing to do with your 1/4 mile time. 16.8 is a very slow time you might need to get some one to look at your car and see if there is anything wrong with it.

[Rgw2kx]

ok, i just want an idea of what could be causing such a huge loss in power

[Rgw2kx]

check engine light came on shortly after the races, the code that came up said that my front o2 sensor was messed up, could that cause any loss in power? and i have never checked any of the plugs on this car as i only got it a month ago, could sh*tty plugs be causing anything?

[MainFrame]

Bad plugs can cause all kinds of problems. You should make sure the car is up to date with all its scheduled maintenance.

[poly_poly-man]

bad front O2 can mess with things big time - screws with OL fueling (and iirc, might throw you into limp).

[2.0Rs]

Wow it's like night and day between the threads you've posted. In the other one you had zero clue about what you even owned. If you're popping an 02 code replace the sensor. If it's bad you'll be running pretty damn rich. I'm surprised you haven't noticed really bad gas mileage. Fix that problem then see how it does.

[Rgw2kx]

yeah i just got the car a month ago so im really not 100% sure what i should be feeling/expecting but im dam sure 16.8 is slow as hell...
and im getting the new o2 sensor tomorrow and i plan on changing the plugs very shortly after. ill post what happens

[Rgw2kx]

i also JUST had the HKS uppipe and the performance muffler installed about a week before the races. i shouldn't need a tune for just those right?

[MainFrame]

nope, no tune needed for that stuff

[John M]

The great thing about Subarus is nothing should be a surprise. Buy a logger cable, get the free logging software, and your car will tell you exactly what is wrong. Actually you don't even need full logging software; the Learning View software will give you a snapshot that will probably point out the problem in a single screen.

If your car is that slow then you need to get it looked at before real damage takes place. My quad cab 4x4 truck dips into the 15s

[wreckin]

What tyres are you running?

Has your car been properly serviced and look after?

[wreckin]

What tyres are you running?

Has your car been properly serviced and look after?

[TonyG]

ran low/mid 14's at 95 when I had my 02 4eat, with just an up-pipe. Something is wrong.

[Rgw2kx]

i am going to change the spark plugs and cross my fingers for it to be something as simple as that, if not, guess i have to take it into the subaru dealership and ask em to troubleshoot. thanks for all the help guys, really appretiate it.