SweMike Posted August 6, 2023 Report Share Posted August 6, 2023 Hi guy´s, just put in a g4x wire-in into my s13n 2jz. Have copied all I can from the g4+ settings/maps. Was ready to set base timing but i don´t get any spark! Got spark when testing the coils via the testfunction. Can anyone see whats wrong/missing? Help is much appriciated Thanks! PC Datalog - 2023-08-6 7;31;31 pm.llgx TriggerScopeLog.llgx DRIFTFAMILY 2JZ VVTI G4X.pclx Quote Link to comment Share on other sites More sharing options...
essb00 Posted August 6, 2023 Report Share Posted August 6, 2023 1. Trig1 polarity reversed. You need to interchange the wires. 2. MAP sensor reading incorrectly. You must fix the output unit, and calibration table (Cal Table 5). Quote Link to comment Share on other sites More sharing options...
SweMike Posted August 6, 2023 Author Report Share Posted August 6, 2023 22 minutes ago, essb00 said: 1. Trig1 polarity reversed. You need to interchange the wires. 2. MAP sensor reading incorrectly. You must fix the output unit, and calibration table (Cal Table 5). Ok. Weird though ive just swapped box from a g4+ to g4x, nothing re-wired. Quote Link to comment Share on other sites More sharing options...
Adamw Posted August 6, 2023 Report Share Posted August 6, 2023 2 hours ago, SweMike said: Weird though ive just swapped box from a g4+ to g4x, nothing re-wired. Most older ECU's including G4+, detect the missing teeth by looking for a gap that is some ratio wider than the preceding teeth. If the sensor is wired back to front there will still be a longer gap at the missing tooth area so it would still ofter meet the detection requirements and still run. Just you will have a large amount of timing drift, dwell scatter and a big jump in timing error around the missing teeth area. This is why it is important to check the timing is stable over the full RPM range when setting the base timing. G4X has more complex strategies to detect the missing teeth and also does a gap validation after what it thinks is the gap by comparing it to the teeth following the gap too. Incorrect polarity usually wont make it through the G4X validation. Quote Link to comment Share on other sites More sharing options...
SweMike Posted August 7, 2023 Author Report Share Posted August 7, 2023 Ok thank you for that! Will swap wires and retry starting the damn thing. Quote Link to comment Share on other sites More sharing options...
SweMike Posted August 7, 2023 Author Report Share Posted August 7, 2023 Another question: How do I get the old cal5 values to the G4x? Quote Link to comment Share on other sites More sharing options...
DerekAE86 Posted August 7, 2023 Report Share Posted August 7, 2023 25 minutes ago, SweMike said: Another question: How do I get the old cal5 values to the G4x? Use the "Linear Cal" rather than "Cal Table" and then just assign your MAP sensor to "Linear Cal 1/2/3" rather than "Cal Table 5" Quote Link to comment Share on other sites More sharing options...
SweMike Posted August 7, 2023 Author Report Share Posted August 7, 2023 4 minutes ago, DerekAE86 said: Use the "Linear Cal" rather than "Cal Table" Ok! Done! Thanks! Quote Link to comment Share on other sites More sharing options...
SweMike Posted August 7, 2023 Author Report Share Posted August 7, 2023 Made all the changes, now we get spark, adjusted it to 10deg that lines up with the 10deg mark on the engine. It still does'nt fire. Any ideas what I'm missing?? PC Datalog - 2023-08-7 5;10;23 pm222.llgx TriggerScopeLog2.llgx Quote Link to comment Share on other sites More sharing options...
essb00 Posted August 7, 2023 Report Share Posted August 7, 2023 MAP is still reading very low (constant at 5kPa) on the log. Post the lastest tune file. Quote Link to comment Share on other sites More sharing options...
SweMike Posted August 7, 2023 Author Report Share Posted August 7, 2023 DRIFTFAMILY 2JZ VVTI G4X.pclx Quote Link to comment Share on other sites More sharing options...
essb00 Posted August 7, 2023 Report Share Posted August 7, 2023 I have fixed the MAP sensor config for you. Try to do the MAP sensor calibration. After successful calibration, then try to start the engine. DRIFTFAMILY 2JZ VVTI G4X (1).pclx Quote Link to comment Share on other sites More sharing options...
SweMike Posted August 7, 2023 Author Report Share Posted August 7, 2023 11 minutes ago, essb00 said: I have fixed the MAP sensor config for you. Try to do the MAP sensor calibration. After successful calibration, then try to start the engine. DRIFTFAMILY 2JZ VVTI G4X (1).pclx 470.52 kB · 0 downloads Absolutely mega! Thank you a million times, it runs now. essb00 1 Quote Link to comment Share on other sites More sharing options...
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