wross996tt

What I mean is the PPI does not guaranty you will never throw codes in the future...so you say your max boost is .4, this indicates there is a problem that has arisen since the PPI. You need a Porsche specific code reader and the best one for the price is durametric. Otherwise you can go to a dealer or an indy that has PST2 or PIWIS for diagnostics. You could of course start systematically changing things, but this will get very expensive. Seems to me that you either installed the DVs incorrectly or caused some sort of leak in the process. Did you check for leaks, loose hoses?

Edward Jones

Thanks. Well, no cels before and after ppi, car felt slow before and after ppi. Dealership apparently did not check boost pressure. Ill call them to complain about it.Absolutely no change in feel before and after DV change. That surprised me since new Agency valves were hard to operate with finger pressure while old ones were effortless.

I don't really mind changing stuff on my on since it is practically free compared to having pro do it. $400 for oil change in my area.

Kevin

Edward, welcome to Rennlist and congrats on the new turbo.

In the future it might be better to open up a new thread detailing your own issues or problems.

As Wross has mentioned, you have a existing boost issue or you created the boost issue. Installing "any" bypass valve or DV valve can create more problems with the hoses and "F" tube if you don't catch the tear, leak or connection issue.

You mention "dealer" > is this a Porsche dealer? Give them a call and talk to them. They should quickly be able to diagnosis the problem.

crazyfrog

First thing to do is a pressure test. Any leak will show up ! Could be a faulty diverter valve or turbo actuator or a hose. A pressure need to be done first before spending on parts+labour for nothing. It take 10mns to do one.

Edward Jones

Can you tell me how to do a pressure test? Thanks

crazyfrog

Remove air box , connect a sleeve with a pressure gauge on it, pressurised the intake system. If you have any leak you will see the drop on the dial and hear (not always) the leak , could be at a connection, blown dv, loose jubilee clip, spilt hose or cracked, anywhere really. Spraying some water with washing up liquid help as well.
I think there is some videos on youtube about it and about how to make the kit, do some search.
If you can't do it yourself , go to a tuning company specialised in Porsches, Audi's or even Japanese cars.
A pressure test should be part of a service on these cars really. A small boost leak is ok but a good one car make your turbos spin too fast and one of them can go ....pop !!
When I bought my Turbo I took it to my Tuning company MRCtuning.com for an health check and a pressure test , it took 10 mns to do it , dead easy when you have the kit .

If you have a leak get it sorted.

Macster

Maybe I'm missing something but how can the intake system be pressurized when the intake feeds into the combustion chambers -- 6 of them -- and at least one cylnder's intake valves will be open, at least partially.

Sincerely,

Macster.

Kevin

Macster>> the overlap on these engine isn't like a high strung NA engine. When the intake valve is open the exhaust valve is shut. So, yes you can pressurize the intake. I believe that you have the Porsche manual>> they show a similar method. They go one step further and plug the tailpipes. However, for this engine it is not needed.

Macster

Oops, I meant "exhaust" valve, but point taken.

So, the intake can be pressurized which makes a pressure test a viable test and a worthy one if an intake leak is suspected.

There's a lot of intake plumbing in these things and a lot of places to leak.

Sincerely,

Macster.

Edward Jones

Who is Kevin and where is he located?

wross996tt

Wow, you must be very bored with all of your posting (or perhaps you don't speak english?)...look two posts up...that is Kevin. email him.