Abdi Posted February 12, 2019 Share Posted February 12, 2019 Anybody every experience hesitation or shutter at Wot. Once I hit peak boost in the 3rd start getting hesitation as if I was hitting fuel cut. Plugs have been changed to oem and still same problem. Just Installed BNR 18g with all supporting mods and tuning. Leaning towards coils but nothing looks wrong with them and Im not getting any CELs Here is a graph you can see the wastegate duty cycle Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
FLlegacy Posted February 12, 2019 Share Posted February 12, 2019 You should post up the whole data log with AF ratio, fuel injector duty cycle, pump duty cycle, throttle position, boost target, boost... Link to comment Share on other sites More sharing options...
Abdi Posted February 13, 2019 Author Share Posted February 13, 2019 Here they are.datalog18.csvdatalog17.csv Link to comment Share on other sites More sharing options...
FLlegacy Posted February 13, 2019 Share Posted February 13, 2019 You can also log cylinder roughness if you think it is a misfire on the top end. Coils could definitely be a culprit. I don't see anything that looks amiss in your logs. Have you changed your clutch? It is possible it could be slipping at WOT. Try tracking your boost error as well and see if the ecm is trying to cut boost on you. And if you don't mind, list your mods to the engine/turbo/boost control system. If it isn't a misfire I wonder if your bpv is leaking. Link to comment Share on other sites More sharing options...
Berge56 Posted February 13, 2019 Share Posted February 13, 2019 Have you checked your timing advance? I don't know that this impacts high rpm hesitation, but I know "tired" OCV's were giving me hesitation (below2k) and idle issues. Replaced them and the car runs like new again. I even feel like I picked up power (prolly did since the old OCV's could have been advancing or not returning to zero when commanded). Link to comment Share on other sites More sharing options...
Abdi Posted February 13, 2019 Author Share Posted February 13, 2019 Thanks for the responses me and my tuner have checked everything based on the logs and it all looks normal. Except wastegate duty. Here are my mods 1- invidia q300 exhaust 2- Nameless catted J-pipe 3- GFB BPV 4- racerx tmic 5- AEM air drop in air filter 6- IAG AOS 7- stage 2 comp clutch 8-18g vf54 hybrid turbo 9- Fuel Injector clinic 1000cc 10-DW300 fuel para Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
jmaddocks Posted February 13, 2019 Share Posted February 13, 2019 Might be worth trying a small plug gap (eg .022-.024") if you haven't already. Link to comment Share on other sites More sharing options...
ripstik Posted February 13, 2019 Share Posted February 13, 2019 i had a similar issue that turned out to be the coils. its quite hard to get a CEL from misfires but if you watch misfires for each cylinder it can be pin pointed pretty quickly, then swap the coils and see if the misfire follows. its an accurate and free way to asses your coils. Link to comment Share on other sites More sharing options...
Abdi Posted February 14, 2019 Author Share Posted February 14, 2019 i had a similar issue that turned out to be the coils. its quite hard to get a CEL from misfires but if you watch misfires for each cylinder it can be pin pointed pretty quickly, then swap the coils and see if the misfire follows. its an accurate and free way to asses your coils. Hmm about how much roughness is not acceptable? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Abdi Posted February 14, 2019 Author Share Posted February 14, 2019 Might be worth trying a small plug gap (eg .022-.024") if you haven't already. I just replaced with stock but might be worth a shot do they come pre gapped ? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
moral hazard Posted February 14, 2019 Share Posted February 14, 2019 Do you happen to have No Lift To Shift enabled ? The plugs would have come pre gapped. If you suspect the plugs, I'd consider picking up some copper plugs and adjust the gap on those while you're testing. Any chance youre able to get a learning view screenshot up? Link to comment Share on other sites More sharing options...
nads Posted February 14, 2019 Share Posted February 14, 2019 My Mazdaspeed6 would do this when the plugs were bad. Always checks the gap on new plugs, especially on boosted engines and even more so with elevated boost levels. With your mods you may need to move in heat range for your plugs. Link to comment Share on other sites More sharing options...
ripstik Posted February 14, 2019 Share Posted February 14, 2019 Hmm about how much roughness is not acceptable? Sent from my iPhone using Tapatalk so the roughness is a counter of sorts, not sure of how long it counts for but its no more than 10 seconds. if you see any of the counters get above 2 I'd switch the coils to see if it follows, if not you'll have to start looking at the plugs. i did all fresh coils recently and I haven't seen them above 1 since. you don't even have to log if you have a V3, you can just put all of them on your gauge screen and check the high values after your drive. Link to comment Share on other sites More sharing options...
ripstik Posted February 14, 2019 Share Posted February 14, 2019 Do you happen to have No Lift To Shift enabled ? The plugs would have come pre gapped. If you suspect the plugs, I'd consider picking up some copper plugs and adjust the gap on those while you're testing. Any chance youre able to get a learning view screenshot up? i bought "pre gapped" plugs and uhhh... they definitely had a gap. it was just WELL ABOVE what the service manual says it should be... which i think is .028-.031 but i'd double check that. Link to comment Share on other sites More sharing options...
Berge56 Posted February 15, 2019 Share Posted February 15, 2019 I gap my plugs to .24 on a stage 2 outback. Car makes 290 whp and 330 ft lbs of wtq. Link to comment Share on other sites More sharing options...
Abdi Posted February 17, 2019 Author Share Posted February 17, 2019 Yeah the most I got on roughness was 2 and never repeated on the same cylinder. On Monday im booked for a boost leak test hopefully we can find something wrong, because we cannot find anything. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Road_dog Posted February 17, 2019 Share Posted February 17, 2019 I suspect coils. Build a 4 metric gauge on your AP to display the roughness from each cylinder. If its coilpacks, that gauge should pinpoint which cylinder. Usually it would also throw a CEL. My cylinder #3 coil went up on me. Link to comment Share on other sites More sharing options...
Abdi Posted February 18, 2019 Author Share Posted February 18, 2019 Shop can’t find a boost leak either. Getting a compression and leak down test now. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
moral hazard Posted February 28, 2019 Share Posted February 28, 2019 Any updates? How was the compression? Also do you have a wideband? Link to comment Share on other sites More sharing options...
ibr_adam09 Posted February 28, 2019 Share Posted February 28, 2019 If it's your coils, I have a few available for sale Link to comment Share on other sites More sharing options...
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