Cruise control speed limits and 180km/h limit

[GTOJOE]

Long read....... sorry.

There was a discussion going during NG about cruise control and how it was limited to 110km/h in the AUDM cars and the JDM cars but there is no limit on the USDM cars. I have looked into the cruise control part numbers and they are the same so it's not the computers. My suspicious was the actual speedo its self but I'm not sure about this. It can only be the speedo PCB or the main ECU. So.... has anyone modified their speedo as per my how-to thread and tested their cruise control [above 110]? or has anyone cut the wire to pin 66 on their ECU [disables the 180km/h speed limit] and tested cruise control above 110km/h?

Also might as well keep it to the one thread. The 180km/h limit can be circumvented but cutting pin 66. However our ECU's also use pin 66 to detect if the vehicle is moving and adjusts the idle accordingly. IE stop at lights the idle is raised. So if the signal is not received then the car doesn't compensate and it could idle out or very low when stationary. This can be avoided by simply manually raising the idle. However there was also discussion about this signal also being used [on 2nd gens] to control cooling fan speeds. Fan speed increases etc when stationary. So there is a device by HKS designed to get around all of these. A member on here has one fitted to get around the 180km/h limit.

So to finally get to the point, I suspect the speed conversion chips we used to first create the 280km/h speedo can be used in the same way. This chip converts the signal and turns the speedo from a 180km/h speedo to a 180mph speedo. This also changes the speed limit to 180mph instead of km/h. Everything else works the same and the ECU still compensates for the idle etc. What I suspect is possible is to cut the wire to pin 66 in put the converter chip inline here instead of at the speed sensor on the gearbox. That way all other devices that use the speed sensor's signal would not be effected [cruise control, AA, ECS & speedo] and simply trick the ECU into moving the speed limit from 180km/h to 180mph. If the ECU controls the cruise control then it should also in theory increase the cruise control limit to 110mph instead of 110km/h.

Please discuss.

[GTOX]

^ Will read when I get time :P

[ozdave2]

The only bit of info I can add is that I had a US speedo and changed it to a 280klm/hr speedo and my cruise control can be still set above 110.

[RuralGTO]

Australian 3000GT 1996 owners manual says cruise control can be set between 40 and 200 klm/hr.
USA 3000GT 1999 owners manual says between 40 and 200 klm (25 to 124 mph) as well.
It might be worth a check on if the cruise control unit part numbers for USA and OZ are the same pre August 93.

[GTOJOE]

91 model usdm part number is different but all other years are the same. 91 model part number was replaced with the same part as the jdm so doubt there are any differences.

Dave. Where Did you get the 280 speedo from? Canadian or Australian?

We know Luke's cannot be set over 110 as we tested it on our way to Sydney. Maybe they changed something on the ecu or speedo on the later model audm cars.

Sent from my GT-I9300 using AutoGuide App

[ozdave2]

From Skipper Mitsubishi in Perth!

Originally Posted by GTOJOE

91 model usdm part number is different but all other years are the same. 91 model part number was replaced with the same part as the jdm so doubt there are any differences.

Dave. Where Did you get the 280 speedo from? Canadian or Australian?

We know Luke's cannot be set over 110 as we tested it on our way to Sydney. Maybe they changed something on the ecu or speedo on the later model audm cars.

Sent from my GT-I9300 using AutoGuide App

[Ausgt3]

Originally Posted by GTOJOE

So there is a device by HKS designed to get around all of these. A member on here has one fitted to get around the 180km/h limit.
Please discuss.

HKS type II Fuel Cut Defender - 3 wire install - was able to set CC at any speed and accelerate to any speed also.

The HKS FCD is an electronic device developed to properly raise the factory fuel cut level on factory turbocharged vehicles. As modifications are made to optimize engine performance, the factory fuel cut is often triggered by higher boost levels which activate a fuel delivery cut-off as a failsafe procedure. Symptoms of fuel cut are hesitation, bogging, and/or illumination of diagnostic indicators

http://www.nengun.com/hks/fuel-cut-defencer

[GTWHOA]

Speed limit defender?

[Ausgt3]

If Tuffsig and he's Aus del one was cruize control limited whilst stock and i had this as my only modification, i can only make the assumption.

[TUFSIG]

The cruise control limit is annoying however even more so for me because my speedo is out a bit so at 110 im only doing 101.