weird turbo response

[charvel]

Hopefully someone can reassure me that my turbo isnt about to die

If i'm in 1st or 2nd gear and accelerate gently (just driving normally) I can hear the turbo sucking (have induction kit). As it reaches around 2k rpm, the turbo feels like it dies, I hear the pressure dump and the car power cuts dramatically.

If I give it some then everything is fine.

Could it be that there is just quite a harsh line between when the turbo is on and when it is off, and because of the gearing (being in 1st or 2nd) i'm feeling the power cut more as the turbo dumps?

sorry for the crap description, hopefully someone/everyone experiences the same making this normal...

 

[karlosR]

try it with the tcs turned off and see if it still happens. my car dumps in first and second if it breaks traction and sometimes the light on the dash doesn't flicker on.

 

[charvel]

try it with the tcs turned off and see if it still happens. my car dumps in first and second if it breaks traction and sometimes the light on the dash doesn't flicker on.

I onyl notice this when driving very gently like just pulling out of my driving, as it reaches around 2k rpm the turbo dumps, is it normal for it to spin up like this with so little throttle?

 

[karlosR]

maybe you're getting to a point where the turbo starts to spool up then it dumps because the boost isn't needed, who knows? 2K? i doubt my turbo has got any boost to dump that low down the rev range!

 

[Nathanio]

Which year, car, engine, mods etc might be helpful

 

[andycupra]

driving very gently and dumping the turbo doesnt really sound right to me!

 

[charvel]

sorry forgot details

Cupra 2003

mods:
pipercross ind. kit (foam one)
possible non standard dv but not sure what it is.

I can hear a lot of whoosing at low revs escpecially when cold.

 

[charvel]

maybe you're getting to a point where the turbo starts to spool up then it dumps because the boost isn't needed, who knows? 2K? i doubt my turbo has got any boost to dump that low down the rev range!

yeh it's weird I can hear it sucking like a bugger straight away from pulling off.

please axcuse me if I'm using incorrect terminology as I'm new to the world of turbo's.

 

[willcooke]

Mine does this too. I just put it down to the engine warming up or something.
Would a duff N75 cause this?
If it's not normal I think I should get it sorted pronto, I'm going in for a remap next week.

 

[andycupra]

id check you havtn got a leak somewhere.

 

[Avant4me]

Turbo dumping

Mine does this especially when cold. I put it down to the Forge DV being much more sensitive than the old Bosch unit. Also the LC does boost at a much lower level than the LCR. I think the turbo spins up at 1600rpm. If i use a very small throttle, then the DV opens prematurely. Stops when driving on normal roads and when the engine is warm. If that is what yours is doing then its probably ok. it does cause the engine to stutter a little though as its a sudden change, boost, no boost but the throttle is about the same. It is common in the Golf IV as well.

 

[Cupra Ross]

This is very common. I think its a jittery N75.

 

[Gnollins]

Dunno if the LC turbo spools up sooner, but I don't get much turbo spool in my LCR before 3000rpm.

 

[Cupra Ross]

K03S spools up just under 2k rpm.

 

[charvel]

thanks for the reassurance guys, sounds like it's just a characteristic of the enginge, especially if a non standard dv is fitted.

 

[Nathanio]

Have you had a look using VAG-COM for any fault codes

 

[charvel]

no, unfortunately me laptop is dead, and dont have the cable or software
will be looking to get it all soon though

 

[Nathanio]

Might be someone near you from here that might be able to help if you post your location.

Nathan

 

[RobM]

Yup, Happy to help if you're near Southampton

 

[charvel]

Thanks for offer mate, but i'm in Norwich.
I'm looking into getting the cable and software though so should be able to check it soon.