you must download cmagic4. where? i don't know if i can put a link here. maybe you have cmagic4 in the folder Circuits. When you have cmagic4 extract magic datas from S1CTXX.DAT (also in the folder Circuits). and you have this text file (in red values for levels: grip and power. + more difficult). changes values and put magic data in S1CTXX.DAT.
[GP4 magic file]
9 ; frontwing player dry?
8 ; rearwing
29 ; 1st
34 ; 2nd
39 ; 3rd
45 ; 4th
51 ; 5th
56 ; 6th
14 ; fw player wet?
14 ; rw
27 ; 1st
32 ; 2nd
37 ; 3rd
42 ; 4th
48 ; 5th
54 ; 6th
9 ; fw ai dry?
8 ; rw
29 ; 1st
34 ; 2nd
39 ; 3rd
45 ; 4th
51 ; 5th
56 ; 6th
5788 ; brake balance dry
14 ; fw ai wet?
14 ; rw
27 ; 1st
32 ; 2nd
37 ; 3rd
42 ; 4th
48 ; 5th
54 ; 6th
5738 ; brake balance wet
55 ; hard tyre
54 ; soft tyre
100 ; >= 50 tyretype 1 else 0
16384 ; unused
16384 ; unused
16384 ; unused
16384 ; unused
16002 ; track +grip -grip
16384 ; unused
16384 ; unused
24 ; (+=-down force)moins related to next value below
970 ; ride height-distance sol-voiture
16975 ; air resistance?
10152 ; consomation fuel autres voitures
128 ; subtracted from diff between field_e2 of 2 cars and then compared to speed of first car
15053 ; tyre wear
64768 ; (ai grip)added to car.field_108. related to cc grip factor
572 ; ai grip finetune
484 ; ?? cc power factor ace
480 ; ?? cc grip factor ace
477 ; ?? cc power factor pro
477 ; ?? cc grip factor pro
470 ; ?? cc power factor semi-pro
471 ; ?? cc grip factor semi-pro
461 ; ?? cc power factor amateur
464 ; ?? cc grip factor amateur
449 ; ?? cc power factor rookie
457 ; ?? cc grip factor rookie512 ; ?? cc random perf range min
2048 ; ?? cc random perf range max
220 ; (ai errors) some chance. same chance multiplied with race perc.
64 ; (spin recovery-recuperacion trompo)segment count, range 1 to 256
2 ; sectors to pit in begin
19 ; sectors to pit in end
20480 ; pre pit speed limit
17015 ; fuel consumption player
17015 ; fuel consumption ai
3343 ; cc shuffler???
128 ; a segment nr before which flag 0x80 in car.flags_ce is not cleared
86890 ; timing factor? (dw)
0 ; timing factor finetune? (dw)
15400 ; helps decide if a tyre set needs changing? (dw)
21000 ; same as above (dw)
13 ; rain chance
6 ; segment nr (start of some range)
6 ; segment nr (end of some range)
256 ; another perf factor
20000 ; unk (dw)
136 ; unk (dw)
10000 ; black flag penalty
2048 ; blck flag
240 ; unk (dw)
115 ; new (dw)
110 ; new (dw)
13 ; new (dw)
0 ; new (dw)
1814 ; new (dw)
896 ; new (dw)
0 ; new (dw)
0 ; new (dw)
0 ; new (dw)
16384 ; unk (dw) (always 16384?)
16384 ; unk (dw) (always 16384?)
16384 ; unk (dw) (always 16384?)
16384 ; unk (dw) (always 16384?)
16384 ; unk (dw) (always 16384?)
16384 ; unk (dw) (always 16384?)
100 ; pitstop group 1 %
8 ; stop 1
2 ; pit window 1
0 ;
0 ;
0 ;
0 ;
0 ;
0 ; pitstop group 2 %
0 ; stop 1
0 ; pit window 1
0 ; stop 2
0 ; pit window 2
0 ;
0 ;
0 ;
0 ;
0 ; pitstop group 3 %
0 ; pit window 1
0 ; stop 2
0 ; pit window 2
0 ; stop 3
0 ; pit window 3
0 ;
1588 ; failure chance : suspension
0 ; failure chance : loosewheel
0 ; failure chance : puncture
2700 ; failure chance : engine
10 ; failure chance : transmission
2444 ; failure chance : oilleak/waterleak
0 ; failure chance : throttle/brake
14 ; failure chance : electrics
16384 ; unused
16384 ; unused
16384 ; unused
16384 ; unused
25968 ; bump factor
15 ; bump shift
[bumptable]
41,1
73,1
274,1
293,1
329,1
361,1
864,1
880,1