turbodailydan Posted August 12, 2019 Report Share Posted August 12, 2019 Hey guys so I'm currently running an early Ross trigger kit on my rb26 and have one of their new kits coming which is a better design as per the pic. The early kit has 12 pointed teeth on the crank, the new one has square edged teeth, and the old cam trigger had an indent, where as the new one has a tooth. Using gt101 sensors. Just looking for for what settings I should use on this, ie rising edge or falling edge on crank/cam? Cheers dan Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 13, 2019 Report Share Posted August 13, 2019 Falling on both generally. The rest of the settings should be the same assuming the old one used hall sensors as well. Quote Link to comment Share on other sites More sharing options...
turbodailydan Posted August 13, 2019 Author Report Share Posted August 13, 2019 Thanks Adam, reason I ask is I'm sure I read somewhere that the g101 sensors were more accurate when set to rising edge on the crank and falling on the cam or vice versa. So just wanted to confirm. Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 14, 2019 Report Share Posted August 14, 2019 The fall time is about 5x faster than the rise time. This means the falling edge is the most accurate. Still spliting hairs tho, even 5uS is 5/8ths of F all. Having said that, the GT101 has been obsolete for several years now so I would be surprised if that is what they are supplying. More likely one of the Littlefuse or ZF replacements. Quote Link to comment Share on other sites More sharing options...
turbodailydan Posted August 30, 2019 Author Report Share Posted August 30, 2019 yeah im using the gt101's because that's what I ran with the old kit, but I had hot start issues with the old style triggers. have synced up the new triggers now and the hot starting has improved massively Quote Link to comment Share on other sites More sharing options...
turbodailydan Posted September 13, 2019 Author Report Share Posted September 13, 2019 Rather than start another topic I thought I’d just continue on here. I decided to upgrade the gt101 sensors to the more popular cherry hall sensors now. Just wondering whether these will be happy off the 5v supply that I was running to the gt101’s or if they need a 12v supply? And if so where would be best to get that from? (It’s an v88 plug-in r32 gtr) cheers dan Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 14, 2019 Report Share Posted September 14, 2019 5V will be fine but for best results I suggest you add an external pull-up resistor. Pic below from the cherry datasheet suggests a 1Kohm pull up for 5V supply. The one inside the ECU is only 4.7K, so quite a bit weaker. Quote Link to comment Share on other sites More sharing options...
turbodailydan Posted September 14, 2019 Author Report Share Posted September 14, 2019 Ok cheers Adam. Just to confirm that the resistor is to be tee'd between the 5v supply and return signal like below? Shame this can't be done internally through the ecu Quote Link to comment Share on other sites More sharing options...
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