Urgent help needed!!!

[M.keane]

Help?! I have a clio mk3 tce and it did have a fully atmospheric valve. I recently found out that it's the wrong type of valve to have on it. Knowing this I have just taken it off and taken it for a little test drive and it's spinning the fronts like mad (clio power!) But in second gear it hits 3000 rpm then it like shuts down quick, dropping the nose then it's fine again. Its done it twice in a ten minute drive. What's going on?

 

[oVerboost.]

You need the valve fitted at least until you get an original to replace it! Running without can cause excess boost pressure and if continually run can cause long term issues. So re-fit the valve ASAP.

You able to post a picture of the valve you have? As I'm guessing its a "dump valve" that regulates excess boost away from the turbo unit itself. As standard it would direct it towards the airbox, where as an atmospheric valve "dumps" it to the atmosphere, if it were to return towards the turbo itself it could cause turbo stall, as you've got air being forced back towards blades spinning in a direction that is the opposite to the way the air would try to travel back towards it. It's probably causing a sensor or something to detect something isn't right with it removed and therefor the cars behaving weird.

 

[M.keane]

Thanks for this reply. The original is fitted. Your were right about the valve I've been told I need a recirculation variant that was the reasoning behind removing the atmospheric. Could it be a pressure sensor in the turbo?

 

[oVerboost.]

I'm not all that clued up on modern turbo setups to be honest, but grew up with the old RS Turbo's, R5 GTT's etc...

Chances are yes, there will be a sensor that is detecting that too much excess air is in the system I expect, and will cause the ECU to cut the boost off to a safe level, which is what your experiencing when you have loads of acceleration and then the car nose dives as it's being electronically restricted.

 

[M.keane]

Right ok. Not good I'll have to take it to a shop then. Thanks for the help

 

[oVerboost.]

Can you not just re-fit the atmospheric valve for the time being?

 

[M.keane]

I could but it started to spraying oil up on to the bonnet and I was told by ktec that it is the wrong valve and needs to be removed.

 

[oVerboost.]

Spraying oil?! It shouldn't have that much oil going through it - otherwise it would point towards failed turbo seals. Have a look at your air box/filter and see if that's coated in oil or not.

 

[M.keane]

That's what I thought, the air box is clean.

 

[STEVE.M]

Not sure why there would be any oil in the air filter box.
A dump valve will be positioned between the turbo & the throttle body, and if the turbo has blown, you won`t be able to see what`s following you in the rear view mirror.
Oil on the underside of the bonnet?
Check the filler cap is present & the dip stick fully home.

 

[M.keane]

This was the state it was in then the atmospheric was installed.

 

[oVerboost.]

You sure that oils come from the valve?

I'd buy a recirc valve off eBay bud, and try that.

 

[M.keane]

Thanks for the help guys