jimmylemon Posted October 22, 2018 Report Share Posted October 22, 2018 Hi All, Ill try to keep this short. Engine is a rb26/30. Running a ross trigger kit, exact one here except the 36T on crank: https://rossperformanceparts.com/product/nissan-rb-crank-cam-trigger-kit-twin-cam-2/ Now it was all running great, then I had some issues with the cylinder head. Got the head back and re-installed, now its popping and backfiring around 4K RPM. You can feel it sort of start to die around 3800 and starts hating life, just does not want to rev. Now I am still getting use to this trigger setup and how it works, so forgive me if I ask a really stupid question. The only change in the cylinder head is it now has a 290 duration camshaft on the exhaust side, where as before it had 280 on both in and ex. Would the camshaft duration change be the cause of maybe the timing being out now somehow? If so how can I now resolve it? Everything else is checking out, ie fuel pressure, spark, no boost leaks, etc. Cheers. Quote Link to comment Share on other sites More sharing options...
Steve Posted October 22, 2018 Report Share Posted October 22, 2018 Sounds like your camsensor might fire on the "wrong"/other side of a crankkthooth compared to before. Calibrate your timing again and see if its of its target. Also check your triggerscope and make sure the cam and crank teeth isnt too close to each other Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 23, 2018 Report Share Posted October 23, 2018 Assuming you have an ecu with the trigger scope hardware built-in then the first step is to do a triggerscope and attach it here. Here is a quick vid showing how to do it: https://1drv.ms/v/s!AiYbYlZQuRHPmieMTkwQDCXEb2LY Quote Link to comment Share on other sites More sharing options...
jimmylemon Posted October 23, 2018 Author Report Share Posted October 23, 2018 Appreciate your help Adam, your a good bunch of guys at Link. Attached is a trigger scope, and a log file of it occurring. When running it again just now, it almost feels like some kind of cut occurring, just stops revving once it hits a high rpm, comes back down again and continues to run. Log 2018-10-23 5;49;26 pm.llg rb26-30.pclr Trigger Scope Log 2018-10-23 5;42;58 pm.llg Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 23, 2018 Report Share Posted October 23, 2018 I have helped Jimmy via our tech support livechat. It was not trigger related at all, the oil pressure limiter was being activated because the oil press sensor was not working. Quote Link to comment Share on other sites More sharing options...
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