for the last few weeks i have been driving my car and when i let off the gas to change gears it revs a little higher everytime. its funny. i dont think it is me bacause all my life i have been driving a standard car and i had 6 of them. can anyone tell me what they think is wrong. i recently changed my muffler and i was thinking if it could be that. ill take any advice i can get, thanks

 

Is the BOV working properly? When you lift throttle can you hear it?

 

nope its not that it works fine i dont know man???????????????

 

do a little search around the forum, i've read the same topic about this a couple months back. i think that its suppose to be normal ...
same feeling the first couple of weeks driving my wrx, when you lay off the gas to change gear, it tends to rev up a little bit. if even if you lay off the gas for a couple of secs then switch gears still does it.
i'm comming from an eclipse to wrx, i remember when this happened while driving my eclipse it is uncommon to over rev between shifts (means im not letting off the gas earlier while shifting)

chris

 

hello, i am pretty sure its normal. you'll be ok.

 

thanks guy. its just so weird maybe ill try to switch back my old exhaust

 

Its normal. Don't waste your time changing your exhaust out. Mine (stock) always blips up about 100 - 200 RPM.

 

happens to me too!

 

Mine does it too. It's not so much that it revs up when you lift off the throttle but the ECU seems to hold it at that throttle position for a moment. When the load of moving the car is removed by stepping on the clutch, the throttle is at the same position and the engine revs a bit. I could guess that it has to do with emissions to prevent unburned fuel from passing through the engine when the throttle plate is suddenly closed but someone more knowledgable about tuning or emissions would know more than me.

As long as the rpm doesn't go much up by more than a couple of hundred and as long as it drops back down after a moment or two, I wouldn't be too concerned about it. It is more noticeable on my WRX than on a previous factory turbo car (Shelby Omni GLHS) but I've gotten used to lifting a second before shifting, especially when cold.

If the engine revs seems extreme, you might drop it off at the dealer to see if something else might be amiss.

--
0==WW==0
"…axles of evil…" - george w. bush

 

I have a stage 4+ WRX and my car still does that, it did it stock, and with all the mods, just think of it as the car holding the revs high for you during fast driving

Austin

 

My 02 WRX does this (Stage 2) as well, but the problem is only noticeable at higher revs -- in other words, the faster the RPM is dropping as I go into neutral, the more likely the rev-up is to happen...

...to me, it doesn't seem to be a fueling or ECU issue at all -- it sounds like the transmission flywheel is suddenly cut loose from the transmission and does a "spinout." Our engine doesn't have a harmonic damper, so perhaps what is happening has to do with a sudden speed-change of the pulleys and flywheels which causes belt lash...

 

I have no idea what you guys are talking about, Im very sensitive to my car but have never noticed this when shifting.

 

Mine does it and I like it. When you're running it hard it helps you keep a higher RPM into the next gear.

 

Your issue, is very, very NORMAL. This happened on my stock WRX all the time. I usually noticed it under heavy acceleration, and deduced that since WRXs have a recirculating air system, which means that the air going into BOV is sent back into the engine intake side whenever the throttle is lifted, that this air along with any remaining fuel to be ignited is what causes the RPMs to slightly rise after each shift. Once I got an atmospheric-venting BOV, the RPM issue disappeared, although I then had to deal with backfiring, which was a result of the ECU not accounting for the 'missing' air. So rest easy, your car is alright.

 

^^^^oh, I get it now. yes normal for me too