Angelus

The car has been "flashed", or re-mapped as it's know over here. I was getting 1.1 bar boost when I bought the car and spoke with the company who done all the work to it. 1.1 bar boost is expected, if I run Shell V-Power fuel, cheap unleaded only gives me 0.9 bar.

What I've found is, even with the seized actuator, it didn't make any noticeable difference to the boost/performance of the car?

It now has 69,000 miles on it.

Macster

Ok, flashed it is then and my assumption was wrong.

Those actuators whatever they do are there for a reason. Get the bad one fixed or it appears if is not fixable replace the affected turbo.

With a flash you want those things, everything with the car, working 100%.

Even a stock engine needs this. Demanding 200Hp more from these engines means every critical/vital system is much more critical/vital to the mod'd engine's continued good health.

Sincerely,

Macster.

timmhaines

my x50 runs 1.3 peaks at 1.4

Angelus

Thanks Mac', I'll order a set of actuators. The Forge ones look good. The one on my passenger side/your driver side looks like it is the lowest part of the engine and parallel to the ground. All the crap thrown up from the wheels is spraying all over it. It looks like a shield would stop it getting covered so much? Because they are handed, the other side is half way up the turbo and has a dog leg on the shaft, it isn't as bad.

c32AMG-DTM

The Forge ones are allegedly very good. And, you can swap the springs for an OEM wastegate level, or a higher (i.e. 1 bar) level if desired. A nice option.

DesignerGenes

Turbo S, STOCK, produces 1.1 bar. At 30,000 mile service, car is in "splendid shape."

c32AMG-DTM

You're the original owner?

I wasn't aware that any 996TT variants (base, X50, S, or even the GT2) ran over around 0.8 bar boost (conditions-dependent) from the stock ECU programming. 1.1 bar of max sustained boost definitely sounds like a car that's been tuned, or has something else going on. Just my $0.02.

Macster

Max. boost is operating conditions dependent. Primarily -- based on my limited testing/experience -- the primary operating condition is altitude, elevation above sea level.

At lower elevations (say roughly < 3K feet) 0.7 bar boost is the most boost I've seen.

However, some road trips have me driving at elevations 4K feet, 7K feet and 8K feet (and nearly 9K feet in a few spots) above sea level and I have at these elevations done hard acceleration runs -- full throttle in 4th or 5th even 6th gear at around 2.5K rpms (in the lower gears) to around 3K rpms in 6th gear -- and have seen at the very highest elevations 0.9 bar boost for a long enough period of time to be convinced the engine was being boosted by 0.9 bar that the readings were not some anomaly.

This agrees with what I was told by senior Porsche techs that the DME will attempt to satisfy the torque demands of the driver whenever possible.

At lower elevations extreme or max torque demands -- to the upper limit allowed -- are satisfied by 0.7 bar boost.

At higher elevations max torque demands require more boost to satisfy, thus the 0.8 bar even 0.9 bar boost.

Other owners have reported similar experiences.

The Turbo S model with its higher nominal boost threshold might be able to develop even higher boost levels under similar conditions but I have no direct experience with the Turbo S. But based on my experience with my Turbo that its nominal 0.7 bar boost can obtain a legitimate bump of 0.1 or even 0.2 bar boost I would say the Turbo S could see a similar bump over its nominal boost whatever that is. I can't recall.

Sincerely,

Macster.

"02996ttx50

my stock x50 car never boosted over .9. ever. lord knows i tried.

c32AMG-DTM

Thanks guys, appreciate the responses - good info.

wross996tt

Sorry...NO WAY a stock S will produce this sustained boost. The ECU has been flashed.

crazyfrog

A turbo S(x50) boost 0.9 bar max. 1 bar sometimes in full charge downhill.
My actuators were working but were properly rotten. Did replace them with some Forge Motorsport one. They resist corrosion much better than the stock one. Be aware ! Someone qualified need to fit them . Different springs set up and adjustment and sometimes ECU need to be twicked on stock car and remapped too.

Angelus

I have been told the Forge ones are hard to set up and the stock ones are easier. Like you say, the Forge ones might last longer.

crazyfrog

Well if you leave your car stock the Porsche one are fine , it is just they rust too quickly. If you go for remap, high flow cats, the Forge actuators will make a difference. Because they are adjustable they are much better compare to stock. They do reduce the lag.
I had my cats gutted and will have a MRC remap soon, my actuators will be finaly set once for good.