sulaiman:
The problem I'm not getting anything above 1.1
even the 1.1 I saw it only once and it's not easy to try and flor it .. I need a good stretch of a highway with no cars around
but never seen the 1.2 and I tried to the kickdown to try the overboost there was no deference
You usually always see 1.2 bar over 240 kph in Sport oder Sport Plus mode when you fully accelerate from let's say 220 kph on. Otherwise, 1.2 bar are pretty seldom, 1.1 bar is OK. You will NEVER see more than 1.2 bar.
This is how it works with the boost pressure and some of you may be surprised:
The maximum boost pressure (for both, the Turbo with Sport Chrono and the Turbo S) is 1.2 bar. No kidding. There are however two different boost ranges which need to be understood:
1. Overboost range (between 2.000 and 4.000 rpm) without Sport/Sport Plus, both Turbo und Turbo S produce 1.0 bar maximum boost pressure (torque 660 Nm in the Turbo and 700 Nm in the Turbo S) and with Sport/Sport Plus the Turbo and Turbo S produce 1.2 bar maximum boost pressure (torque 710 Nm for the Turbo and 750 Nm for the Turbo S). It may look like a 0.2 bar boost pressure increase with overboost but in reality, it is 0.15 bar. The display doesn't show 0.01 bar digit steps, only 0.1 bar steps. The different maximum torque figures for the Turbo and Turbo S result from a different boost pressure level at the corresponding rpm figure.
So you will see 1.2 bar even on the regular Turbo but the maximum torque is lower compared to the Turbo S, the car has a different software mapping. It may look like an artificial limitation but in reality, both software mappings actually have their purpose (the Turbo S mapping is slightly more "aggressive") and have been individually programmed/adapted.
2. Maximum power range (Turbo S at 6.250 rpm), this is where the Turbo S engine produces 1.15 bar, the Turbo 0.9 bar. This is where the power difference of 40 hp comes from (0.25 bar more boost pressure equals 40 hp more power in this case).
Please don't ask more details, even if I had them, I couldn't share them with you.
So what I am basically saying here: In real life driving conditions, the performance differences between the Turbo and Turbo S are limited, especially in the lower rev range (with the exception of the maximum torque rpm range) and in the lower speed range (below 200 kph or so). So if someone cannot (or doesn't want to afford...for various reasons) the Turbo S, the Turbo isn't a bad choice either.
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RC (Germany) - Rennteam Editor Porsche 991 Turbo S, Porsche Boxster S (981), BMW X3 35d (2013)