I ran yesterday before I flash back to the latest GIAC ECU flash.

All test was done at Sport mode
On 3rd gear, I was able to get 14 PSI for about a second then drop
4th gear, 15 PSI
5th gear, 16 PSI
6th gear, 17 PSI

I ran at least couple of times for each gear then the results were same.
Can anyone verify if this was an actual stock ECU tune?

 

Anyone?

 

Your boost will change depending on several factors, fuel (AFR), timing, IATs, etc. The numbers for each gear may vary depending on the situation.

 

Just curious, do you think this is STOCK setting? I thought stock ECU setting won't let boost more than 14 psi.

 

Impossible to say without more information. How are you measuring boost? Are you in sport mode? Are you just reading the boost gauge on the dash? You would probably need to post a datalog to tell for sure what is going on.

All things being equal cars tend to see more boost on higher gears so that isn't necessarily suspect.

 

In sport mode those numbers seem low. I hit 17-18 pretty consistantly with a bone stock car according to the display on the dash.

 

All testing were done in Sport mode.
I got these PSI numbers from the boost gauge on the dash.

Anyway, after I got GIAC ECU flash I'm able to boost 17 PSI (actual boot should be higher) on every gears.
So I guess I could say it was in stock ECU setting

 

I would contact GIAC and see what they think. They are a top notch company and I am sure will work with you on whatever problem you are having.

How long have you had the car and has it always boosted lower?

 

Your boost will vary depending on whether or not you're triggering overboost mode. Stock cars will see 17 psi for a couple of seconds in higher load gears with it triggered, but will make less than that out of overboost.

With cars that have upgraded software, the factory boost gauge is very misleading as it doesn't read above 17 psi. With our software, you should be seeing upwards of 20-22 psi with the latest generation files. Your gauge is showing 17 psi all of the time because it's actually making more than that.

 

As Austin said, if I am not in sport/overboost then I read an indicated 14 most of the time. I THINK I may tick 15 from time to time but I dont recall.

Is there any CLEAN way to display actual boost pressure without a handheld or some ugly pods stuck somewhere?

 

Control By The Motronic Control Unit ME 7.8.1
Optimum adjustment angles are set by way of functions in
the engine control unit depending on the engine operating
point, so that the target engine torque is reached as
quickly as possible. The optimum vane positions for
maximum efficiency were determined for the complete
engine map as part of extensive application work. The
goal was above all to optimize the response behavior
particularly for dynamic acceleration. Variable turbine
geometry allows a full torque characteristic to be achieved
even at low engine speeds and also provides a wide power
spectrum in the nominal output range.

Adaptation Of Boost Pressure Control
The boost pressure is a variable which is influenced by
engine tolerances and ambient conditions. The following
ambient conditions influence the boost pressure with
respect to the maximum engine torque, protection of the
engine and turbocharger as well as fault entries.
• Air pressure (the boost pressure is adapted from an
altitude of
> 5,900 ft (1,800 m) in order to protect the components
of the turbocharger).
• Ambient temperature and intake air temperature (charge
air temperature) (the boost pressure is reduced at an
ambient temperature
< approx. 32° F (0° C), or a charge air temperature <
approx. 50° F.
(10° C).
• Fuel quality (knock resistance under thermodynamic
loading).
The adaption ranges 0 to 11 are available for boost
pressure adaptation. These are divided into 3 load ranges
(boost pressure) and 4 engine speed ranges. Adaptation
of +/- 15 % is possible for each range before a fault is
entered.

Table Of Boost Pressure And Speed Thresholds
(See below)

plsol – Boost pressure in mbar
nmot -- Engine speed in rpm

Partial Load Adaptation
The adaptation ranges 0 / 3 / 6 / and 9 are available for
partial load or reduced full load due to ambient conditions
(e.g. poor fuel quality).

Full Load Adaptation
The adaptation ranges 1 / 4 / 7 / and 10 are provided for
full load under normal conditions.

Full Load With Overboost
The adaptation ranges 2 and 5 are available for full load
with Overboost (Sport Chrono activated). The adaptation
ranges 8 and 11 are not normally adapted.

Exhaust Temperature Sensors, Banks 1 and 2
The signal from the exhaust temperature sensors of banks
1 and 2 installed at the turbine inlet is used in the DME
control unit for component protection. The exhaust
temperature is evaluated for each bank in the DME control
unit, and is restricted to a maximum temperature of
1,767° F. (980° C) by enrichment or boost pressure
adjustment. The two sensors are combined into one
component unit together with their control unit. The
measured signals are evaluated in this control unit.


Sport Chrono Package Turbo (Optional)

The Sport Chrono Package Turbo is offered for the first
time for the new 911 Turbo. The package contents correspond
to those of the Sport Chrono Package Plus from the
current 911 Carrera (997) generation, but are supplemented
by the functions, Overboost , PTM control and
modified starting program for the optional Tiptronic S.
The “Sport Chrono Package Plus” offers the driver distinctively
sporty settings for various vehicle functions,
therefore providing a completely new sporty driving experience.
The accelerator pedal characteristic, engine
behavior at the speed limit and in the event of load
changes, PSM intervention thresholds as well as the characteristics
of PASM and Tiptronic S are all changed at the
push of a button. The Sport Chrono program also allows
the driver to control these advantages as required to take
into account contemporary conditions.

Additional Function – Overboost
Overboost is a brief excess increase in the boost pressure
(max. 10 s) for acceleration under full load (fully
depressed accelerator pedal). The function is activated
after operation of the Sport button on the center console
and fast depression of the accelerator pedal. Overboost is
performed with the assistance of the boost pressure
control and results in an increase in the maximum boost
pressure by approx. 2.9 psi (0.2 bar) (20 %). As a result,
the maximum torque is increased from 460 ft lb (620 Nm)
to a maximum of 505 ft lb (680 Nm) between 2,100 rpm
and 4,000 rpm (the torque is regulated linearly to the
“normal” full-load value between 4000 and 5000 rpm) and
permits a significant improvement in acceleration performance
and elasticity. The higher boost pressure does not
just result in an abrupt increase in mechanical loading of
the components, but above all also significantly increases
thermal stressing. This is due in particular to the continuously
rising charge air and combustion chamber temperatures.
The Overboost function is restricted to 10 seconds in
order to take these factors and the maximum component
loading into account. After this time, the original full-load
boost pressure without Overboost is restored. The
Overboost function can be reactivated again as soon as
the engine load is relieved briefly by the throttle closing
(e.g. after a gearshift).

Overboost operation is indicated by an arrow symbol in
the boost pressure display of the instrument cluster. The
arrow next to the boost pressure display indicates the
brief Overboost operation, which is possible only in
conjunction with activated Sport function (text “SPORT”
shown on display). The boost pressure indication is shown
as a digital value and as a graphic representation in the
multi-function display. The boost pressure can increase up
to approx. 1.2 bar (17.4 psi) when the Sport button is
pressed; a pressure of approx. 1.0 bar (14.5 psi) is
reached when this function is not activated.