Here are the RPM shift points for most of the cars. I found it from another site. It seems to be pretty accurate. Hope this helps.
DC2
6500 -> 7500 -> 8000
150-152km/h(Myogi ->Akina), 145-147(happo), 130-131km/h(iro)
EVOIV
6000 -> 7000 -> 7000
155km/h(usui, myogi), 150-151km/h(akagi, akina), 130 km/h(iro)*
EVOIII
6000 -> 6500 -> 7000 -> 7250
FD3S
6000 -> 6500 -> 7300
160km/h(myogi), 150km/h(Usui), 150-152(Akagi,Akina), 145km/h(happo), 130km/h(iro)
GC8V
6000 -> 6500 -> 7000
150-155km/h(Myogi -> Akina), 130-132km/h(iro)*
GC8
6000 -> 7000 -> 7000 ->
150-152km/h(Myogi -> Akina), 130-132km/m(iro)*
AE86 Trueno (New Engine)
8000 -> 10,500 -> 11,000 -> 11,000
Cappuchino
8250, 10,500, 11,500
160 km/h(Myogi), 157 km/h IIRC(Usui), 154km/h(Akagi), 157km/h(Akina), 147-148 km/h(Happo), 137 km/h(iro)
EG6
6500->7500->8000
150-152km/h(Myogi ->Akina), 145-147(happo), 130-131km/h(iro)
EK9
6500->7500->8000
150-152km/h(Myogi ->Akina), 145-147(happo), 130-131km/h(iro)
S13
5500 -> 6000 -> 6500
-No Exact 5th gear shift km/h*
S14Q
6000->6500->6750->6900
AE86 Trueno(old engine)
5500->5500->6500->6500
AE86 Levin
5500->5500->6500->6500
AE85
5500->5500->6000->reaching redline
SW20
5500->5500->6550->6550
ZZW30(MR-S)
5500->5500->6500->6500
ST205 (GT-4)
6000>6500>7000>7250
SXE10(Altezza)
6000->6500->7000->7200->7200
FC3S
5000->5000->5500->147-151km/h
BNR32
6500->7200->7800->8000
BNR34
7000->7000->8000->8000->8125
RPS13
6500->7000->7000->7250(7500 akina)
S15
6500->6500->6500->7000->7200
GDB
5900->6200->6700->7000->150-153km/h
NB8C (Roadster RS)
6000->6250->6250->6500->7000