SL ECU Major Differences or Why NOT to Use an SL ECU

[green-lantern]

Passing the some parameters to mimic the knock function of a 98-98 VR4 car. I would like to avoid modifying circuits to prevent frying the ECU.

You don't need to modify the circuits

Knock circuit layout

1998 3000GT SL 
MMC P/N MD347251
MFG P/N E2T61389 H3
PCB P/N JE331B157D

Con1-Pin 91 > R314 (TOP) > C45 (BOTTOM) > R315 (TOP) > IC2-Pin 78 < IC2-Pin 80 > IC1-Pin 92

R314 = 51 KOhm
C45 = 0.02 uF
R315 = 6.2 KOhm
IC2 = Mitsu Electronics E328 logic level converter
IC1 = Renesas H8/539F microcontroller, A/D input 6

1999 3000GT VR4
MMC P/N MD360163
MFG P/N E2T61495 H1
PCB P/N JE331B32804B

Con1-Pin91 > R71 (TOP) > C62 (BOTTOM) > R73 (TOP) > IC7-Pin 78 < IC7-Pin80 > IC9-Pin 92

R71 = 51 KOhm
C62 = 0.02 uF
R73 = 6.2 KOhm
IC7 = Mitsu Electronics E328 logic level converter
IC9 = Renesas H8/539F microcontroller, A/D input 6

If the software is different on the SL it gets replaced when the VR4 stuff is flashed onto the ECU.