2007 TT Boost question

[phillipj]

I have a rather strange issue with my Turbo. The car will not get to full boost. I get about 2/3 bar and I hear a strange "rattle" like litttle rocks in a can) and the boost backs off. On the freeway yesterday I was really trying to analyse the noise. Yesterday it sounded more like a "hissing" sound. Like a vacuum leak. I ran the car for error codes and there were none.

It I have checked all of the connections visible in the engine bay. The "Y" pipe connections and the vacuum hoses on the plenum. Everything seems in order.

I have a friend that has owned a lot of turbocharged cars and he said it could be that the car is not getting enough fuel (running lean) and that "rattle" sound is the result. He said I may have clogged injectors and to change my fuel filter. I thought this unlikely.

My tech (who makes house calls with tools God Bless him) is coming over this weekend to take a look. On the phone he suggested that it might be an intercooler hose that has come loose.

Has anyone had a similar experience with their Turbo?

Thanks !

Oh by the way the car has the GIAC flash, Larger plenum and throttle body, GT2 spark plugs and a Techart exhaust....

[therock88]

I have a rather strange issue with my Turbo. The car will not get to full boost. I get about 2/3 bar and I hear a strange "rattle" like litttle rocks in a can) and the boost backs off. On the freeway yesterday I was really trying to analyse the noise. Yesterday it sounded more like a "hissing" sound. Like a vacuum leak. I ran the car for error codes and there were none.

It I have checked all of the connections visible in the engine bay. The "Y" pipe connections and the vacuum hoses on the plenum. Everything seems in order.

I have a friend that has owned a lot of turbocharged cars and he said it could be that the car is not getting enough fuel (running lean) and that "rattle" sound is the result. He said I may have clogged injectors and to change my fuel filter. I thought this unlikely.

My tech (who makes house calls with tools God Bless him) is coming over this weekend to take a look. On the phone he suggested that it might be an intercooler hose that has come loose.

Has anyone had a similar experience with their Turbo?

Thanks !

Oh by the way the car has the GIAC flash, Larger plenum and throttle body, GT2 spark plugs and a Techart exhaust....

No idea...Seems like you would hear a boost hose come loose?...Would love to hear what you find out though..

Good luck!

DC

[phillipj]

Problem solved. It was the connection fro the throttle body to the "y" pipe. The boost literally "blew it off". It was hard to see at first visual inpection. Replaced the OEM clamp with a higher quality version to prevent it happening again.

My tech came over and we replaced the fuel filter, upgraded the re curculation valves (Evoms) and added bung extensions the the O2 sensors. (This was to prevent the CEL from the 200 cell cats on the Techart exhaust.)

My guy is amazing. Just a kid but he can work on these cars blind folded. He is really teaching me a lot..

All is good now. She tries to spin the tires in first and second gear.:clapping:

Next project is front and rear sway bars. Stock turbo has a terrible "push" when entering corners...

Edited May 10, 2011 by phillipj

[PAULSPEED]

Getting a track alingment will help with the push. Need to

add as much castor as you can. The tires will wear out on the

inside but the car will not push as much.

Paul

[RFM]

I fear that "caster" is not going to help Phillip with his problem, unless you meant "camber".

[PAULSPEED]

Your right again!!!

The camber is what help reduce the push I had.

Paul