Gotrpms Posted February 5 Report Share Posted February 5 I recently finished my install of an S2000x on my 2005 Honda S2000 with a completely stock F22C1 with a few bolt ons. I had the car tuned by Jeff Evan’s and I am very pleased with the performance and quality of the tune and hardware. I have one issue that I need some help with. On a cold startup the engine cranks for maybe twice as long as it did stock but then fires normal and idles great. If I take a short drive, stop, and then start it again the engine fires so quickly that it kind of stumbles. Once it fires it idles normally with no issues. Jeff has said that there is something odd with the triggers and has reached out to someone at link for assistance. I figured I would post here to see if the community can help. Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 5 Report Share Posted February 5 If you can give us a PC log of a bad start-up, a trigger scope capture when cranking and a copy of the tune we can take a look. I dont see any support tickets in the system for evans performance. If its using the K20 trigger mode, I can say that is fairly well validated as we owned a K20 test car for several years. Although that doesnt mean there couldn't be other factors such as voltage offsets or similar that could cause a trigger issue. There was an issue with start up fuel if wall wetting compensation was enabled in some recent firmware, that could potentially fit your symptoms. Quote Link to comment Share on other sites More sharing options...
Gotrpms Posted February 6 Author Report Share Posted February 6 Ok here is a log that contains a good but slow start and an warm start. The second start happens so fast that it is difficult to get a trigger scop but I think I have one. Also attached is the ecu map file. Please let me know if any of these don't work. Tuning File Datalog Trigger Scope Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 7 Report Share Posted February 7 The log file only has one start-up in it (in the middle when ECT = 90°C), possibly the ecu disconnected during the cold start? Your engine is using the S2000 trigger mode, not the K20 mode that I assumed earlier, and there are a couple of odd observations related to the trigger. The trigger scope shows the engine slows down a lot as each piston comes to TDC compression, the crank speed is normal with about 260RPM at BDC, but drops to 120RPM at TDC. Does it sound like it cranks unusually slow and/or uneven like an engine does with a drained battery? Is there any known reason for this such as a light flywheel, higher than stock compression ratio or small/relocated battery etc? Possibly related to this is it appears to take longer than normal for the ECU to determine that the crank is actually turning - in this hot start log there is only about 0.5s delay after the starter signal that the ecu reports RPM, but even this small delay will mess up some startup strategies a little such as the fuel pump is not running when pre-crank prime occurs and a large drop in fuel pressure during crank enrichment etc. And this delay could potentially be worse when cold. Can you get us a log of a cold start and another scope capture with a cold engine. If you could also try getting another variation of the scope capture on a different occasion by clicking the capture button at about the same time or just slightly before you engage the starter so we hopefully capture what happens as the crank just starts to move. Quote Link to comment Share on other sites More sharing options...
Gotrpms Posted February 8 Author Report Share Posted February 8 Ok I have no mods internally that would cause weak cranking, and I don't hear the car struggling it just takes longer to fire. Below are the requested logs and trigger scopes. I also included a normal idle trigger scope as well. Trigger Scope - Idle Trigger Scope - Cold Start Datalog - Cold Start Trigger Scope - Pre Start Datalog - Pre Start Quote Link to comment Share on other sites More sharing options...
Gotrpms Posted February 16 Author Report Share Posted February 16 Bumping this thread, hoping someone can help me solve my issues. Quote Link to comment Share on other sites More sharing options...
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