Porsche 996 GT4
Tuned to replicate Porsche 996 GT4
Hawthorns Motorsport / Neil Garner Performance Engineering
Rod Barrett/ Jan Persson/ Jay Shepherd
BritCar GT Endurance Spa 2008/2009
Sports Soft
CAR : RUF RGT '00
Tire : Sports Soft
Specs - 996 GT4 Base Power
Horsepower: 375 HP at 7200 RPM
Torque : 290.7 ft-lb at 5100 RPM
Power Limiter at : 93.4%
Weight: 1410 kg
Ballast : 200 kg
Ballast Position : 33
Weight Distribution : 39 / 61 - as in real life spec.
Performance Points:
495
Specs - GT3 Cup Power
Horsepower: 390 HP at 7500 RPM
Torque : 290.7 ft-lb at 5100 RPM
Power Limiter at : 97.0%
Weight: 1410 kg
Ballast : 200 kg
Ballast Position : 33
Weight Distribution : 39 / 61 - as in real life spec.
Performance Points:
499
Specs - SRO BOP GT4 Power 2010+ ( 996/997 )
Semi Racing Exhaust
Horsepower: 409 HP at 7600 RPM
Torque : 299.3 ft-lb at 5100 RPM
Power Limiter at : 98.8%
Weight: 1410 kg
Ballast : 200 kg
Ballast Position : 33
Weight Distribution : 39 / 61 - as in real life spec.
Performance Points:
506
GT AUTO
NO Oil change
Improve Body Rigidity (
INSTALLED IN THIS BUILD ) -
MANDATORY
Wheels : Standard Size BBS-RS in Gold
Car Paint : White ( Solid or Pearl )
Tuning Parts Installed :
Racing Exhaust
Isometric Exhaust Manifold
FOR GT4 Base / GT3 CUP Spec ( REMOVE FOR SRO BOP SPEC )
Intake Tuning
( ONLY FOR SRO BOP SPEC )
Triple Plate Clutch
( ONLY FOR HEWLAND AND G97/63 997 GT3 Sequential )
Adjustable LSD
Fully Customizable Suspension
Weight Reduction Stage 2
Suspension - Custom EIBACH ERS with Sachs 2 Way Damper
Alternative Setup / Stable / Race Alignment / GT3 Cup Spring Ratio 485/525
Front, Rear
Ride Height: 60 70
( OPTIONAL Ride Height : 63/82, 73/92 or real life 996 GT3 Cup limit 83/102 )
Spring Rate: 8.66 9.38
Dampers (Compression): 7 7
Dampers (Extension): 7 6
Anti-Roll Bars: 6 5
Camber Angle: 2.5 1.7
Toe Angle: -0.16 0.37
Suspension - Custom EIBACH ERS with Sachs 2 Way Damper
Base Setup / Loose / Race Alignment
Front, Rear
Ride Height: 60 70
( OPTIONAL Ride Height : 63/82, 73/92 or real life 996 GT3 Cup limit 83/102 )
Spring Rate: 8.66 18.75
Dampers (Compression): 7 7
Dampers (Extension): 7 6
Anti-Roll Bars: 6 5
Camber Angle: 2.5 1.7
Toe Angle: -0.16 0.37
DOG CLUTCH TRANSMISSION - Porsche G96/91 GT4 Base
GETRAG 6 Speed Fully Synchronized Transaxle ( Stock Clutch )
Set Default
Set Final to 4.420
Set Auto Max Speed at 230kmh / 149mph
Adjust each gear :
1st 3.150
2nd 2.000
3rd 1.560
4th 1.240
5th 1.030
6th 0.860
Set Final : 4.000 -
Medium/High Speed Track ( OPTIONAL : 3.440 Final from G96/90 GT3 Transaxle - more top speed )
DOG CLUTCH TRANSMISSION - Porsche G96/97 GT3 Cup 2004/2005
GETRAG 6 Speed Fully Synchronized Transaxle ( Stock Clutch )
Set Default
Set Final to 4.420
Set Auto Max Speed at 230kmh / 149mph
Adjust each gear :
1st 3.154
2nd 2.000
3rd 1.560
4th 1.310
5th 1.090
6th 0.911
Set Final : 4.000 -
Low/Medium Speed Track ( OPTIONAL : 3.440 Final from G96/90 GT3 Transaxle - more top speed )
DOG CLUTCH TRANSMISSION - HEWLAND 6 Speed Sequential ( Triple Plate Clutch )
OPTIONAL
Set Default
Set Final to 4.400
Set Auto Max Speed at 230kmh / 149mph
Adjust each gear :
1st 3.000
2nd 2.067
3rd 1.625
4th 1.316
5th 1.111
6th 0.960
Set Final : 3.440
DOG CLUTCH TRANSMISSION - Porsche G97/63 996 GT3-RSR End of Production
PORSCHE 6 Speed Sequential Dog Engagement Transaxle ( Triple Plate Clutch )
OPTIONAL - also used on Neil Garner 997 GT3 Cup
Set Default
Set Final to 4.400
Set Auto Max Speed at 230kmh / 149mph
Adjust each gear :
1st 3.167
2nd 2.133
3rd 1.722
4th 1.348
5th 1.115
6th 0.931
Set Final : 4.000
( OPTIONAL : 3.440 Final from GT96/90 GT3 Transaxle )
LSD - Paul Guard Race Spec 50/80 with GT3 Cup Preload Limits
Initial Torque : 24
( Preload Range 12 - 27 ) Use 27 for high speed track.
Acceleration Sensitivity: 30
Braking Sensitivity: 48
OPTIONAL
LSD - 996 GT3 Cup Base Spec 40/60 with GT3 Cup Preload Limits
Initial Torque : 24
( Preload Range 12 - 27 ) Use 27 for high speed track.
Acceleration Sensitivity: 24
Braking Sensitivity: 36
Brake Balance:
4/3 ( personal BB) or for ABS 0 wheel : 3/2, for ABS 1 - feel free to use your preferred brake balance. I recommend to run 1 click lower at the rear.
Recommended setting for DS3 user :
Steering sensitivity at +1 or +2, all aids off, except ABS 1 ( if not comfortable with ABS 0 ) with 4/3 brake balance as starting point.
Notes :
The Porsche 996 GT4 is a rather unique race car, it's rare, only one team uses it at BritCar GT Championship.
Details are hard to come by, I only have drivers name, best lap times at 2 tracks that can be replicated in GT6 ( Spa and Brands Hatch Indy ), base power figure and the rest I have to adapt from SRO GT4 Porsche BOP spec ( 1411kg, 415PS )
As it's not a really replica, I included a variety of choices of power and gearing setup. For power, there are 3 setup, GT4 Base ( 380PS/375HP ), GT3 Cup ( 390HP ) and SRO BOP ( 415PS/409HP ), all are on the same weight from SRO BOP, 1410kg - the closest I can get with max ballast, 1 kg less. Weight distribution is at 39/61 like the 996 GT3 spec. With lowest power - GT4 Base, the replica can easily beaten the real life lap record at Spa and Brands Hatch Indy. GT4 Base and GT3 Cup spec uses isometric exhaust manifold, while SRO BOP uses intake tuning instead ( remove exhaust manifold ). Racing exhaust used on all setup.
Suspension uses Eibach Springs and Sachs 2 Way Damper, the 997 GT4 uses Moton Race Damper. I set the springs to the stiffest possible, with damper, ARB and alignment to give good traction/balance with the rear heavy layout. I have added additional suspension setup using real life GT3 Cup Spring Rate Ratio, the setup also has optional ride height from real life 996 GT3 Cup limit 83mm / 102mm, use the difference if preferable, eg : 63/82
The GT4 Base uses G96/91 ratio from GT3 Cup 1999-2004 ratio spec ( medium to high speed ), I have also included variety of ratios used by 996 GT3 cars ( RSR, Cup ) The G96/97 6 Speed is best for low to medium speed track, while the G97/63 Sequential and Hewland offers better shift speed/performance with triple plate clutch.
LSD is Paul Guard 50/80 Race Setup, with medium preload, this offers great traction, stability and responsive around mid corner. The base spec GT3 Cup LSD has 40/60 Setup, I also included this as an option.
I tuned and tested the Porsche 996 GT4 at Spa, Silverstone GP, Brands Hatch Indy, Laguna Seca and Red Bull Ring. The real life best lap at Spa Francorchamps 2009 BritCar GT Rd 3 was 2:36.164, at Brands Hatch Indy 2009 BritCar GT Rd 7: 49.415. Both can be beaten with GT4 Base 375HP + Hewland Ratio
Here are the lap times of the test run :
Silverstone GP : 2:14.076
Brands Hatch Indy : 0:49.094
Spa Francorchamps : 2:34.287
I also included replays of all 3 lap times for reference.
ENJOY
View attachment 237131
View attachment 237135
UPDATE : Added alternative suspension setup with real life GT3 Cup spring ratio, offering better stability and ease of driving. Added optional ride height based on real life 996 GT3 Cup limits, the difference can be used at lower height, eg 63/82. Added LSD Initial Torque / Preload value range allowed in GT3 Cup, from 12 to 27 Max. 27 LSD Initial Torque best suited for high speed track, run lower for tighter tracks/low speed.