Speed Limiter

[wokburner]

Noticed the thread on disconecting the speed limiter on the R33s can this be done on the R32 GTR and will it affect the HICAS, by cutting the wire or is a Speed/Fuel limiter defender necessary. Is there any one that has done this and how well did it work.

Thanks MB

[GTR032]

I got rid of mine by using an Apexi Rev Speed Meter..just re routes the speed signal in then out of the RSM, therefore eliminating the 180 speed limiter.

[rs73]

cutting wire 53 is the cheapest one but not recommended for long time as it was said not good for hicas. better get a proper Apexi RSM or a trust/hks speed cut defender.

[Damo]

Has anyone actually looked at a wiring diagram for where this wire 53 goes? I have heard all this talk about it not being good for HICAS but does it actually go to the HICAS computer?

[krzysiu]

just chip the ECU or get a power FC

[rs73]

R33 ECU can't be reprogrammed, only R32 can. Best of luck trying it unless u get a replacement chip something like a Powerchip?

PowerFC works only with manual cars, not with auto so auto GTS-t owners are left stranded out there. So if they got an auto, then RSM for $300-400 or speed cut removing device like HKS/Trust SCD around $85 or cut wire 53 for free with risk it may affect something else....

[blind_elk]

Has anyone actually looked at a wiring diagram for where this wire 53 goes?  I have heard all this talk about it not being good for HICAS but does it actually go to the HICAS computer?

According to the wiring diagram, wire #53 is a branch off the connection to the HICAS unit. The ECU does not become part of the circuit controlling HICAS. That would explain why, in general, the HICAS is not affected when #53 is cut.

[rs73]

According to the wiring diagram, wire #53 is a branch off the connection to the HICAS unit. The ECU does not become part of the circuit controlling HICAS. That would explain why, in general, the HICAS is not affected when #53 is cut.

Ok, now does the ECU requires speed signal in conjunction with other factors such as engine rpm, throttle pos, crank angle, etc to determine how much fuel to add into the engine? Will cutting this "magical" wire 53 to make the ECU "speed blind" will have effect on any A/F ratio or timing or anything else?

[knore]

Ok, now does the ECU requires speed signal in conjunction with other factors such as engine rpm, throttle pos, crank angle, etc to determine how much fuel to add into the engine? Will cutting this "magical" wire 53 to make the ECU "speed blind" will have effect on any A/F ratio or timing or anything else?

Thats exacly what i was thinking, How about putting a switch there so u can choose when to have the limited off for the track etc

[paulr33]

wire 53 is used by hicas diagnostic and ecu to monitor speed in km/h. mine has the speed cut take off (unsure how) and i have no running problems etc.. i dont believe cutting 53 causes any problems other than being unable to exit hicas diagnostics once you enter it. it wont break hicas or make it stop working its just if you do hicas diag mode you cant exit it easily

so ive read anyway

[blind_elk]

AFAIK, the speed signal has no effect on fuelling, it is simply telling the ECU how fast the car is travelling. When the ECU detects that the car is up to a predetermined speed, it starts into a section of its programming to limit the speed by cutting fuel and / or spark.

[azza_GT-R]

is it possible to just remap the standard computer in an R32 GTR? instead of getting a whole replacement

[azza_GT-R]

thefore eliminating the speed cut

[Duncan]

absolutely not just for speed cut, you can do a pretty good tune on it