Installation and Conversion Instructions

911 (991)
8/17

ENU

1001

1

Power Kit (I-no. X51)

Revision:

This bulletin replaces bulletin Group 1, #8/17, dated July 20, 2017.
This revision includes two additional kit part numbers and related information.

Model Year:

As of 2017

Vehicle Type:

911 Carrera S (991)/911 Carrera 4S (991)/911 Targa 4S (991)

Concern:

Subsequent performance increase to 331 kW (450 HP)

Engine Type:

Standard engine MDC.HA with engine power of 309 kW (420 hp)

Subject:

ONLY for vehicles with Sport Chrono Package (I-no. QR5)

Restrictions:

ONLY approved in conjunction with sport exhaust system (176).
ONLY approved in conjunction with optimized ventilation of rear axle.
Comes as standard on vehicles with Porsche Ceramic Composite Brake (PCCB = 450) or rear axle
steering (470).

General
information:

A parts kit is available for increasing the performance of the standard engine.
Increased performance is achieved by implementing the following measures on the engine:
•
•

New exhaust turbochargers (referred to hereafter as turbochargers) with larger turbine/compressor
wheel diameters and a higher volume.
Modified maps for the DME control unit.

The following additional modifications are also required and the following preconditions must be met on
the vehicle side:
•
•
•

New engine compartment cover with carbon inserts, painted Titanium Grey.
Sport exhaust system incl. tailpipes (if not already fitted).
New wheel carriers with ventilation openings and spoilers on the rear axle (if not already fitted 
vehicles with PCCB or rear axle steering).

The higher-performance engine is also available straight from the factory for the new vehicles mentioned
above under Exclusive option No "X51".

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Installation and Conversion Instructions

Information
All remote controls (keys) are required for teaching a DME, front-end electronics (front BCM), rear-end
electronics (rear BCM), electronic steering lock (ELV) control unit or remote controls (keys) for example.
Remote controls (keys) that are not taught during this teaching procedure will no longer be recognized by
the vehicle.

Information
Please inform the customer of this accordingly.
Engine
Break-in:

Engine speeds greater than 5,000 rpm are not permitted over a distance of 310 miles (500 km). The
maximum engine power of 331 kW (450 hp) depends on the total mileage of the engine at the time of the
retrofit and is achieved at a total mileage of approx. 6,250 miles (10,000 km) or higher.

Warranty:
Information
In order to provide a warranty for the retrofit, the dealer must create "Power Kit (I-no. X51)" documentation for the relevant vehicle in the "Porsche Quality Information System = PQIS".
Retrofitting: Warranty in accordance with the Repair Conditions and the Warranty Conditions for Original
Porsche Parts.
New vehicle with Power Kit (I-no. "X51"): Vehicle warranty in accordance with Porsche guidelines.
Diagram:

Figure 1
A

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Page 2 of 32

– Power (kW)

Tequipment

2017© Porsche Cars North America, Inc.

Installation and Conversion Instructions
B
C
D
E

Technical
Description:

–
–
–
–

911 (991)
8/17

1001

ENU

1

Engine speed (rpm)
Torque (Nm)
Standard engine: 500 Nm at 1,700 rpm or higher and 309 kW (420 hp) at 6,500 rpm
Increased performance engine: 550 Nm at 2,150 rpm or higher and 331 kW (450 hp) at 6,500
rpm

Standard-production engine

Increased performance engine

MDC.HA

MDC.HA

6

6

91 mm

91 mm

Lifting height:

76.4 mm

76.4 mm

Displacement:

2,981.4 ccm

2,981.4 ccm

Compression ratio:

10.0 : 1 (-0.5)

10.0 : 1 (-0.5)

Max. engine power
at engine speed:

309 kW (420 hp)
6,500 rpm

331 kW (450 hp)
6,500 rpm

500 Nm
from 1,700 – 5,000 rpm

550 Nm
from 2,150 – 5,000 rpm

Engine speed limitation at:1

7,500 rpm

7,500 rpm

Idle speed:

650 ± 80

650 ± 80

Acceleration 0–100 km/h (0–62
mph):2

4.3 s

4.1 s

Acceleration 0–200 km/h
(0–124 mph):2

13.7 s

13.1 s

191 mph (308 km/h)

194 mph (313 km/h)

Engine Type:
No. of cylinders:
Bore:

Max. torque
at engine speed:

vmax:2
1

Engine speed at operating temperature

2

Values for 911 Carrera 2 Coupé (manual transmission)

Information
Please inform your sales staff and customers about the engine “break-in” precautions.
Copy the first three pages of these Installation and Modification Instructions and give them to your
customers!
Software:

•

9900 - PIWIS Tester 3: Minimum version 35.600.010 (update from 30 May 2017)

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Ordering
Process:

Installation and Conversion Instructions

8/17

ENU

Information
Before programming the "Engine immobilizer" and "Digital engine electronics = DME" control units, the
performance class (P class) must be changed for the vehicle to be converted. This is done by PORSCHE
AG!
When ordering a Power Kit, it is important therefore to send the following vehicle data to Porsche by
submitting a TLAR:
•

Part number of the retrofit kit

•

Vehicle identification number (VIN) of the vehicle to be converted

•

Order number used for ordering parts

For further information: see also  Figure 2.
A
B
C
I
II
III

IV

–
–
–
–

Porsche dealer
PCNA
Porsche AG
Requesting change of performance class (P
class) directly via TLAR
– Checking and forwarding data via TLAR
– Changing the performance class (P class) by
Porsche AG. Then providing information to
importers via TLAR
– Providing information to dealers via TLAR

Figure 2
Information
If you do not have the necessary data or if the data you have is incorrect, Porsche AG will NOT be able to
change the performance class.

Parts Info:

991.044.100.103

 Power Kit, 331 kW (450 hp), set

991.044.100.11

 Power Kit, 331 kW (450 hp) incl. sports exhaust system (I-no.
176), set

991.044.100.153 4

 Power Kit, 331 kW (450 hp) incl. rear-axle brake ventilation
system, set
 Power Kit, 331 kW (450 hp) incl. sports exhaust system (I-no.
176) and rear-axle brake ventilation system, set

991.044.100.164

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2017© Porsche Cars North America, Inc.

Installation and Conversion Instructions
991.504.990.025

911 (991)
8/17

ENU

1001

1

 "Exclusive Powerkit" engine compartment cover – Carrera,
complete
 "Exclusive Powerkit" engine compartment cover – Targa,
complete

991.504.990.045

3

ONLY for vehicles with sport exhaust system (I-no. 176)!

4

ONLY for vehicles WITHOUT PCCB (450) and/or WITHOUT rear axle steering (470)!

5

Also order according to vehicle!

Parts list:

Figure 3
Parts included with Power Kit:
9A2.123.031.52

1x

Turbocharger, cylinders 1–3  Figure 3 -1-

9A2.123.032.52

1x

Turbocharger, cylinders 4–6  Figure 3 -2-

9A2.111.215.00

2x

Turbocharger/exhaust manifold seal  Figure 3 -3-

9P1.251.263

2x

Turbocharger/catalytic converter seal  Figure 3 -4-

999.707.612.42

4x

O-ring, 12 x 2.5 (turbocharger pressure line)  Figure 3 -5-

999.707.692.40

20 x

O-ring, 10 x 3 (turbocharger oil line)  Figure 3 -6-

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999.707.387.40

2x

O-ring, 15 x 2.5 (turbocharger oil tank)  Figure 3 -7-

999.707.603.40

4x

O-ring, 10 x 3 (turbocharger coolant line)  Figure 3 -8-

999.084.642.02

14

Hexagon nut, M8 (turbocharger/catalytic converter)  Figure 3 -9-

9P1.129.260.A

2x

Clip, ∅ 75 (intake pipe)  Figure 3 -10-

999.512.779.01

2x

Hose clamp, 50 x 70 (intake pipe)  Figure 3 -11-

N 105.188.01

2x

Hose clamp, 40 - 60 x 12 (charge-air hose)  Figure 3 -12-

N 105.189.01

2x

Hose clamp, 50 - 70 x 12 (charge-air hose, not shown)

999.707.694.40

2x

O-ring, 45 x 3 (intake pipe)  Figure 3 -13-

9A7.008.755.00

2x

O-ring, 13 x 3 (tank ventilation line)  Figure 3 -14-

9P1.251.571

2x

Clamp (main muffler)  Figure 3 -15-

900.123.007.30

1x

Sealing ring, 14 x 18 (drain plug on thermostat housing, not shown)

991.504.990.026

1x

991.504.990.046

1x

"Exclusive Powerkit" engine compartment cover ASSY – Carrera 
Figure 3 -16"Exclusive Powerkit" engine compartment cover ASSY – Targa (not
shown)

6

NOT contained in the set. Also order separately according to vehicle!

Figure 4

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2017© Porsche Cars North America, Inc.

Installation and Conversion Instructions

911 (991)
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ENU

1001

1

Parts included with rear-axle brake ventilation system (ONLY contained in the sets
991.044.100.15/.16):
1x
991.331.111.33
Rear-axle wheel carrier – left  Figure 4 -1991.331.112.33

1x

Rear-axle wheel carrier – right  Figure 4 -2-

298.407.621

2x

Angular-contact ball bearing (wheel bearing)  Figure 4 -3-

999.217.042.04

8x

Hexagon-head bolt, M8 x 53 (wheel bearing cover)  Figure 4 -4-

WHT.007.021

2x

Hexagon nut, M22 x 1.5 (rear-axle drive shaft)  Figure 4 -5-

999.217.116.01

12 x

999.073.452.01

4x