Hey guys

 

I have a picture of a turbo and was wondering what is this part inside of it? And what it is responsible for? 

 

 

I highlighted it with blue circle ? 

 

I've been told it can make a mettalic rattling sound at first warm up and a lot of these turbos have it in common and nothing to worry about. 

Is that not the dump valve (probably has a better name)? It's used to regulate the boost pressure and actively opens and closes to modulate the release. 

Or, it's the variable vane mechanism on the inlet side but doesn't look quite right for that. Been a while since I looked at turbos so don't quote me on any of that.

As @MarkyG82says, it's an internal wastegate, to regulate boost pressure.

From my little knowledge, it is quite common and not much to worry about. But if it starts affecting performance, gets more noticeable more often or starts to throw up error codes, then obviously it'd need investigating 

I knew it had a better name and ashamed to say I knew it was the waste gate. Need to brush up.

7 hours ago, MarkyG82 said:

I knew it had a better name and ashamed to say I knew it was the waste gate. Need to brush up.

Showing your age mate 🤣 who didn't want the stututututu, back in the day

On 16/06/2023 at 21:03, MarkyG82 said:

Is that not the dump valve (probably has a better name)? It's used to regulate the boost pressure and actively opens and closes to modulate the release. 

Or, it's the variable vane mechanism on the inlet side but doesn't look quite right for that. Been a while since I looked at turbos so don't quote me on any of that.

Thanks for that since I got the car I always sent him back to the mechanic due to this sound at start up only. But they explained me everything showed me this turbo and told this can make a rattling sound. They also started up few other  gti's which  made the exact sound. Performance wise and everything else is perfect. Thank you for reply. 

On 18/06/2023 at 09:55, Taniv said:

Thanks for that since I got the car I always sent him back to the mechanic due to this sound at start up only. But they explained me everything showed me this turbo and told this can make a rattling sound. They also started up few other  gti's which  made the exact sound. Performance wise and everything else is perfect. Thank you for reply. 

It can also be the actuator connection pivot onto the wastegate arm as well that rattles. It is outside the turbo that connects to the waste gate actuator. It's in left of shot but that borgwarner is probably not from your car anyway so connection method will not be identical but similar.  

 

It was so much of a complained item in mk2 fl and golf gti mk6s vw had a clip to tighten up the linkage that helped in some cases.

 

If it is the wastegate pivot bushings themselves that allow flap when closed you can end up with underboost which vw's solution will be to fit new turbo although sone turbo rebuilders can remanufacture the bushings and wastgate flapper to operate correctly. 

 

 

Edited 20 June, 20232 yr by TheClient

6 hours ago, TheClient said:

It can also be the actuator connection pivot onto the wastegate arm as well that rattles. It is outside the turbo that connects to the waste gate actuator. It's in left of shot but that borgwarner is probably not from your car anyway so connection method will not be identical but similar.  

 

It was so much of a complained item in mk2 fl and golf gti mk6s vw had a clip to tighten up the linkage that helped in some cases.

 

If it is the wastegate pivot bushings themselves that allow flap when closed you can end up with underboost which vw's solution will be to fit new turbo although sone turbo rebuilders can remanufacture the bushings and wastgate flapper to operate correctly. 

 

 

Thanks I've had the actuator and turbo replaced, still making the same sound but been told nothing to worry as everything else works just fine and that these cars are the noisy ones.

 

 

They  specialise only in VW's and dealer had to spend big £ to replace it all. 

Edited 21 June, 20232 yr by Taniv