I don't thrash my car about, hardly ever spool up the turbo too much, but over the past few days I've noticed that my dump valve isn't blowing off as much as it normally does.

i've only ever been in turbo cars that have dump valves, so not sure how one should sound without one, but the noise that mine is making after spooling sounds like the air is being released in small, sharp bursts, kinda like a chatter. The DV lets some go, but very very little. I wondered if it was maybe when the engine was a bit colder that this happened, as I'm sure it has done it before, and noticed it wasn't long after starting the engine.

The pipe I have coming off my DV is not the usual kind, it's actually a piece of piping that was used on an old Escort for the washers, so it's very flimsy compared to the usual type of pipe that should be used.

I wondered if this was maybe the problem? I wrapped a cable tie around the connection on the DV to make sure it wasn't leaking any air out there, but it doesnt seem to have made much difference, maybe slightly.

My gf has the proper blue samco type hose, so I will try this later, but anybody who can suggest anything else, the info would be greatly appreciated.

it's a Bailey dump btw, in case that is of any importance

Thanks

Keir

 

Sounds like your DV is not opening or not fully anyway, so you are getting turbo chatter.
You really need a decent bit of pipe to DV to operate it, but may be jammed, does it lose boost ?, in which case if diaphragm sort could be split diaphragm, so needs looking at, usually come apart easy and new diaphragm's if needed are not too dear.
tabetha

 

cheers!

I can't really tell if it's losing boost as it's not got ecu/map sensor etc fitted yet, so only running 3-4 psi, so it doesn't really pull away much anyway.

My gf has the same type of DV, I'll maybe swap it out to check. Where can I get hold of the type of pipe I need? Are they sold seperately?

Will the DV not working properly actually damage the engine in any way?

 

If turbo is chattering and it has a few miles on it, it does put a extra strain on it, but some run like this anyway as they love the chatter, chavvy people!!
If it is leaking boost then will not do any damage, pipe does not have to be anything special, I use FISH TANK pipe a lot as mostly silicone so as not to harm the fish and about 1/2 the price or lower than proper car stuff.
Hope that helps, any more just get back or PM me.
tabetha

 

To be honest with you if you arent spooling the turbo up much when you come off the throttle the vacuum pressure in the inlet manifold wont be very high, you can drive the car in such a way that the DV releases very gently, if you boot it down the road you will hear how much more violently it dumps.

Unless you are getting running problems i wouldnt worry too much

 

All I was meaning about hardly using the turbo, was that I didnt think the DV or anything to do with the turbo would be buggered from how I've been driving it.

I do understand that the harder I push it, the more release their will be, and it was during the odd burst that I noticed that it just wasn't as loud as it used to be.

Working all weekend so put a cable tie around the pipe connection to the DV to make sure it was secure, and it sounds ok again, so I guess I need to get a decent bit of pipe and fingers crossed that's all it was.

Thanks for the info, I'll re-post if the problems persist