borr Posted April 22 Report Share Posted April 22 Hi Guys Evo8 usdm converted to Evo9 Strong internals, good fuel, big turbo Trigger errors during rpm limit, on just warmup'ed engine everything fine Later 8500 limit goes down to 7k, later 6500 Crank trigger wheel looks like new, we put new wire from crank sensor to ecu. Try different ecu (also Link G4x) same Mivec have "noise" 0-7 degree when target is 0, means always 0-7 cam degree on Idle and high RPM Red Evo 9 6.5 rpm limit error latest.llgx red Evo Trigger Scope Latest - 2024-04-22 7_53_33 pm.llgx Red Evo 9 98Oct 620HP 5.pclx Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 22 Report Share Posted April 22 My suspicion is more around ignition noise than an issue with the trigger as it is just coming on to full load around that RPM. Im assume if you lower boost it will rev cleanly to the RPM limit? Wasted spark ignition generates a lot of noise so all noise reduction considerations need to be well covered for wasted spark ignition at high boost. Does it have resistor spark plugs fitted? Are the HT leads OEM or a good quality performance brand and in good/new condition? What sparkplug gap is it running? Quote Link to comment Share on other sites More sharing options...
borr Posted April 23 Author Report Share Posted April 23 Hi AdamW Thanks for promptly reply We have other Evo in our shop. Lets call it Wht Evo. Its equipped with PRP coils Scope is very nice, and car runs good. We put coil assy from that car to our car with rpm limit problems, and scope absolutely same (weird) Originally we use Spoolinup evo coils on that car. Pictures: https://photos.app.goo.gl/bYFdZgd4ocBrPGx28 Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 23 Report Share Posted April 23 The "noise" on the scope is normal, this is artificial noise caused by a combination of the 8bit resolution and aliasing due to the sample rate. I see the same "noise" even with a clean computer generated signal on the bench sometimes. The exhaust cam sensors are pretty prone to failing on modified evo's, so if you haven't tried that and still have the other car available you should try swapping that as a test. But apart from that I would still be concentrating on ignition system noise. Quote Link to comment Share on other sites More sharing options...
borr Posted May 17 Author Report Share Posted May 17 I found relation between DBW duty and batt voltage on ecu When dbw do something it cause voltage drops and something happen with crank trigger Ecu saw this and make rpm limit The car is equipped with a large 100mm throttle, do not pay attention to the maximum opening of 70% Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 17 Report Share Posted May 17 No, the throttle moves because the RPM drops to 0 when there is a trigger error, your throttle target for <800RPM and 100% APS is 24%, so the throttle tries to quickly close to 24% when the trigger error occurs. The throttle motor will draw about 6A from the relatively small ecu power supply wire so you will see a small voltage drop. Quote Link to comment Share on other sites More sharing options...
borr Posted May 17 Author Report Share Posted May 17 31 minutes ago, Adamw said: No, the throttle moves because the RPM drops to 0 when there is a trigger error, your throttle target for <800RPM and 100% APS is 24%, so the throttle tries to quickly close to 24% when the trigger error occurs. The throttle motor will draw about 6A from the relatively small ecu power supply wire so you will see a small voltage drop. Give me e-mail, i will send you some logs Quote Link to comment Share on other sites More sharing options...
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