Hi, if you want to have the correct power curve, you can check this page
http://www.automobile-catalog.com/curve/1997/241775/audi_s4.html
I have done the modif in the power.lut and in the engine file (including 13 per cent of transmission losses) and got 25.4s for the 1000m stop and go 5it was given for 25.3).
Also I was able with the modif bellow to reach 251km top speed by changing the wheel size 225/35/R16 (done with Content manager)
Original wheel on this car are 225/45/R17
Power.lut
0|-25
500|20
1000|114.3
1250|123.6
1500|116.4
1750|114.84
2000|116.00
2250|116.00
2500|116.00
2750|116.00
3000|116.00
3250|116.00
3500|116.00
3750|116.00
4000|115.25
4250|113.68
4500|112.17
4750|109.33
5000|106.89
5250|102.66
5500|98.19
5750|93.96
6000|88.28
6250|79.46
6500|14.50
6750|0.00
7000|0.00
Modif in engine.ini
[ENGINE_DATA]
ALTITUDE_SENSITIVITY=0.1 ; sensitivity to altitude
INERTIA=0.08 ; engine inertia
LIMITER=6250 ; engine rev limiter. 0 no limiter
LIMITER_HZ=15 ; Frequency of engine limiter
MINIMUM=800 ; Idle rpm
DEFAULT_TURBO_ADJUSTMENT=0 ; DEFAULT turbo adjustment if one or more turbos are cockpit adjustable
[TURBO_0]
LAG_DN=0.985 ; Interpolation lag used slowing down the turbo
LAG_UP=0.9960 ; Interpolation lag used to spin up the turbo
MAX_BOOST=1.8 ; Maximum boost generated. This value is never exceeded and multiply the torque like T=T*(1.0 + boost), so a boost of 2 will give you 3 times the torque at a given rpm.
WASTEGATE=1 ; Max level of boost before the wastegate does its things. 0 = no wastegate
DISPLAY_MAX_BOOST=1 ; Value used by display apps
REFERENCE_RPM=2000
; The reference rpm where the turbo reaches maximum boost (at max gas pedal).
GAMMA= 2.5; Turbo pressure sensitivity on accelerator pedal
COCKPIT_ADJUSTABLE=0
[TURBO_1]
LAG_DN=0.985 ; Interpolation lag used slowing down the turbo
LAG_UP=0.9960 ; Interpolation lag used to spin up the turbo
MAX_BOOST=1.8 ; Maximum boost generated. This value is never exceeded and multiply the torque like T=T*(1.0 + boost), so a boost of 2 will give you 3 times the torque at a given rpm.
WASTEGATE=1.00 ; Max level of boost before the wastegate does its things. 0 = no wastegate
DISPLAY_MAX_BOOST=1.0 ; Value used by display apps
REFERENCE_RPM=2000 ; The reference rpm where the turbo reaches maximum boost (at max gas pedal).
GAMMA=2.5 ; Turbo pressure sensitivity on accelerator pedal
COCKPIT_ADJUSTABLE=0 ; cockpit adjustable turbo pressure