Kitto

*EDIT* rewritten it as i had made a confusing error. Hello everyone, This may sound like a bit of an oddball question, one that is more so sensor based than Link based. Using a rocker arm as a cam position sensor, can it be done? We all know the conventional way is to take a reading from the rotating cam or cam sprocket as a home position reference for the ECU however i'm wondering if the same thing can be done by reading the rocker movement? My idea is as follows; Weld in a fitting to the rocker cover for number 6 inlet rocker, use a hall effect sensor such as the GT101 to have around 1-2mm of air gap to the rocker when the rocker is at idle (valve closed, sensor state High). Obviously if the cam is changed then clearance will need to be rechecked. My thoughts of what might be a problem; - The sensor will be in a high state for most of the time and the change point will be when the rocker moves down causing a low state on the sensor, will the ECU accept a low signal as the trigger point? - Hydraulic lifter, so the rocker height may vary - At high rev's the rocker may tend to float, heavy valve springs should solve that however - What point to use as the trigger point that the ECU will reference as home? When the rocker moves downwards away from the sensor causing a low state or when the rocker moves back up as the valve is closing causing a high state but noting that the sensor will sit in a high state far longer than in a low state. - Heat was of some concern, but the GT101 is rated to 150C. You must be thinking why i one would want to do that when you can just reference the cam gear..? Sure using the cam gear is easy, there are even cam position kits available for the engine in question (RB30E) however they are pretty ugly, and in your face at the front of the engine - you can even use the factory distributor for home position but i have deleted it already. I'm trying to keep the factory OEM appearance and well i like a challenge. I have almost ruled out fitting a discreet sensor behind the cam gear (there just is no room), hence my train of thought took me to look at sensing the camshaft itself or a rocker. Thanks for your time, Regards, Dan.

Apologies, i think i've got it now and i've been confused all along. So the Xtreme has 2x CAN BUS ports, one is wired through one of the 34 pin connectors, the other is one of the communications port while the remaining comms port is actually the RS232 connection for PCLink to connect to the ECU. So one could use the hard wired CAN BUS from the 34 pin header > Lambda CAN > Dash / Second CANBUS comms port spare / RS232 comms port for PCLink? I won't be buying a dash for some time so i'll cross that bridge when i come to it Just future proofing.

Excellent, that was a thought of mine - i have worked with CAN before just not in an automotive application. I assume the above is applicable so long as all CAN devices can have user defined baud rates and other CAN protocol so they can all talk on the same bus? Apologies this is testing my knowledge of CAN. Apologies, this is testing my CAN knowledge. Obviously the ECU with PC Link and Lambda will quite happily work on Bus 1 for instance, whereas depending on the Dash there might be a clash? Regards,

Hello all, Apologies if this has been covered before, i did a search but couldn't find anything. I'm looking at an Xtreme ECU and i know down the track i will want to use a CANBUS Dash and the possibility of Link CANBUS Lambda. My question is, can they be used at the same time? One CAN port is required for talking to a PC but not at all times. If this does work am i assuming correctly that say CAN Port 1 - Permanent Lambda connection (needed whenever you are connected to the PC for tuning and driving) and CAN Port 2 - Link to CAN Dash when not talking to the ECU via PClink - simply unplug the dash and plug in USB connection cable? I know i could buy a Fury and free up that CAN port for PCLink however the little bit extra IO is nice to have. If the above doesn't work then my only work around is an external controller with a 0-5V output. Thoughts? Regards,