I just bought a 2004 wrx sedan yesterday. I only have 200 miles on the car, and this is my first turbo car, so I am not sure if it is supposed to do this, but it doesnt seem right.

Whenever I give the car half gas or more, then quickly lift off throttle and engage the clutch, the rpms climb about 200 or so, then start to drop as they normally should.

This is most noticable when cruising at around 3000 rpm, then when I give it gas, and back off quickly with the clutch the rpms jump a bit.

This is completely repeatable, and I made sure that I was not slow pulling my foot off of the gas during the transition.

Should my car do this? If not, will the dealer fix this?

Thanks for any help you can offer.

 

This is very normal. My car does this too, when you releive the back pressure from the tranny to the engine, it makes the engine spin more freely and for a split second it will, it also has to do with the blow-off valve.

 

all WRX's do this Stock, I think the reason for it is when you let off the gas the turbo is still pumping boost into your intake like you have your throtle down, so it takes a quick second for the BOV to engage and relleave the preasure. thats the only explination I have cooked up.

 

Yup that's normal. My 02 WRX does the same too. Don't worry though, you'll get used to it. I have a turboback exhaust and it sounds great everytime I shift when the rpm climbs a lil bit.

 

Congratz on your new scooby, treat her well and she will do the same. Congratz again

"Go big or go home"
WRX Rush

 

ok, thanks

it still bothers me, but I guess its no biggie,

Love the scooby so far

 

Lift off the throttle before you depress the clutch. So it will feel like this: Screw it, I was gonna explain it but just read this (seems to be something a lot of people need to read). http://www.spdusa.com/shifting.htm If you lift off the throttle before depressing the clutch you won't get that overshoot. That overshoot is bad because you have to either wait longer for the revs to fall to the proper amount before releasing the clutch or let out the clutch with the revs still too high. Both are bad/less-than-optimum shifting techniques. It takes some practice and concentration on what you are doing to master it but if you get it right the rpms will drop right away when you depress the clutch. Anyway read that article and go practice some and feel free to PM me if you are still having trouble. Goodluck man and congrats on the car!

Edit: Note when I say lift off the throttle I don't mean completely. It's more of initiating the lift off the throttle (he uses a good expression "roll out of the throttle") before you depress the clutch... The link above explains it well.

 

Think of it this way, if it's not doing it...then it should bother you, if its doing it then everything is normal.

 

No, if it's not doing it you are shifting with good technique. If it is doing it, you need to work on it a little...

Edit: I found that link for you showing rpm vs. speed. Just enter the WRX gear ratios which are:

GEAR RATIOS: 1st 3.454
GEAR RATIOS: 2nd 1.947
GEAR RATIOS: 3rd 1.366
GEAR RATIOS: 4th 0.972
GEAR RATIOS: 5th 0.738
FINAL REDUCTION GEAR RATIO: 3.900

http://www.car-videos.com/tools/speedrpm.asp

The numbers will not be exact because they are a theoretical calculation but it will be VERY close.

 

true. . . because my car does not always do that. some days i shift awesome, some days i don't.