**Remember this thread? **Techy advice needed.... Please!

[oobster]

Edited 02-Jan-06 - found THIS thread over on Scoobynet, which has an explanation of sorts. Just for those interested.

As most of you know, i have an 03-plate WRX.

In the engine dept, it's fairly standard - green panel filter, a Bailey VTA DV & a Ninja back-box on the exhaust. And thats all.

I've noticed recently that when i'm accelerating up thru the gears, the engine revs are staying @ the level they were at before i pushed the clutch in, just for maybe a second or two, then they drop down. It's like the accelerator is sticking for a second once i've taken my foot off it (but it isn't)

I'm 95% sure i'm not imagining it, and i'm fairly sure the car has only been doing this for maybe 2 or 3 weeks.

I know all the arguments about the dump valve, but i get the oil changed more frequently than subaru recommends. I did remove the VTA DV & tried to re-fit the original DV (to see if it cured this 'problem') but i'm struggling to get the metal clip that goes round the large rubber pipe expanded (the space is a bit tight in there!!)

If i need to take it to the dealers to have this looked-at (it's still under warranty) then i'll probably have to re-fit the original DV right?

Any advice much appreciated.

[Boyakasha]

oobster had this on the other halfs 03 WRX as well. I found that when I was nailing it I would lift off to change gear and it would continue reving as though the pedal was stuck.

Never got to the bottom of it and the car is gone now.

Marc

[oobster]

did the Mrs car have a VTA DV on it Marc?

[Boyakasha]

No DV, only thing it had was a decat center and Backbox.

[oobster]

Ok, cheers Marc.

So maybe it's not my DV after all.

You think this could be doing any damage to the car (the revving, not the DV)

I just let a work colleague take a quick shot of the car round the industrial estate and he says the revs do jump 100 or 200 rpm for half a second when lifting off.

[Boyakasha]

I don't think it is anything to worry about. My other half had the car for 2 years then we modded it and it was fine.

Mind you after we stuck the STi Turbo full decat etc on the car and had it remapped it never over reved

The easiest way to get 312bhp out of a WRX

[oobster]

Cheers Marc..... i might just leave it then and mention it when it's in getting it's next service..... the 30,000 one - thats the bank-balance empty one isn't it?

[Boyakasha]

That's the bend over and take it like a man service.

[Iaing]

My car does that too, think its the DV but am not sure. Im relying on a remap to cure it. Its not hurrendous just a bit annoying. Cant see it doing any real damage, its not like it red lines or anything.

My 30k wasnt bad at all! Went to car clinic in Abz and to be honest they did a stirling job. I checked all the parts they replaced and all standard subaru bits were used plugs ect. Was rougly £150 cheaper than main dealer.

[Bing]

Andy,

Ill pay close attention on the way back tonight to see if I share these symptoms!

The 30k service which I recently had from one of the original Subaru gagrages - Melvilles, in perth was also £150 less than main dealer!

After asking them expected cost for cambelt replacement they undercut main dealer by £150 also.

[~ ~ Cal ~~]

Mind does the exact same thing when..........

a) relatively cold

light throttle and then lifting off i.e it's not apparent when nailing it and changing gears with haste

But.........

c) a remap didn't cure it

d) it doesn't bother me too much

e) it didn't happen before i added the centre decat & DV

Hope this helps

Cheers

Cal

[irish al]

Same problem with mine Andy. Have same dump valve as you and decatted exhaust. It doesnt happen all the time on my car.

[mazheriqbal_mohammed]

Same thing happens with my scooby before and after i put the dump valve on, but i think it may have started happening after putting on the downpipe. Not bothered by it and my car has been through sevices with Subaru with both thumbs up so i can live with it!!

I was actually wondering if the effect would keep your turbo spooling up during a gear change so when you next throttle it you get a health amount of boost from the turbo?? Kind of like the heal toe move that the pro's use to rev the engine during braking.

[Bing]

Mine does it too sometimes, just as Cal says.

I can live with it

[=Robbo=]

Yip mine does the same, although I've only noticed it recently. I wondered if it was anything to do with the cold weather?

It wasn't doing it in the summer before or after my andy F remap.

I have full up/down mid decat, green panel filter, Tek 3 and standard dump valve.

Is this a symptom of overboost I wonder?

It does bug me and it's not right, I'd like to see the revs drop quickly on lift off as they should.

We should bump this to the tec section.

Robbo.

[=Robbo=]

I've posted this on Tec Forum.

[oobster]

Thanks Robbo, and thanks everyone else for your replies.

I have also only noticed this in the last few weeks, so perhaps the weather is something to do with it.

I'll mention it to S&S when it's next in there.

[oobster]

BTTT for the new link inserted at the top.

[st3ph3n]

Interesting.

I must say I get it too. I notice it normally when enjoying myself in the lower gears and reasonably high up the revs.

Say I was in 2nd or 3rd pulling maybe 5 or 6K. I lift off (not to shift) then it takes maybe a second before the exhaust note changes.

[irish al]

Not to be rude but they have decided that its fine without actually knowing if it is or not.

Does anyone who replied know the actual technical reason why this happens.

Anyway I forgot about this thread. The day i went to AndyF I asked why this happened to my car.

He explaind it in a way that i no longer needed to worry about it, but in such a way i didnt really understand.

I have forgotten why as i didnt worry about it but am sure he will explain it if you ask him.

[oobster]

Might be wrong, but i assumed 'justanotherperson' said he'd got his info from a dealer.

I've re-read his post and i admit it isn't clear cut, but that's what i read into his reply

[Spaceman]

My 55 plate 8 week old WRX does this too usually in third at lower revs jsut as the turbo is cumin in light acceleration lift if and it trys to drive on. it only became noticeabe about 2 weeks ago when i fitted a bailey VTA???

[harry_hood]

I had a SEAT leon cupra with the same fault,after the dealer had fitted an air flow meter and new dump valve it was later found to be a throttle switch,

[Neofox]

i had a similar problem on my classis it turned out it was the Throttle Control Sensor, i noticed that if i let the engine to the breaking then sometimes my Check Engine light popped on for a second and when the code was checked it flagged this error. Obviously you havent seen the Engine Light but might be a consideration.