09-20-2019, 02:29 PM | #23 | |
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09-20-2019, 04:53 PM | #24 | ||
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Oiled filters and n55 are not well suited as oil gets on the MAF and addles the signals. BP
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09-21-2019, 12:19 AM | #25 | |||
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Anyone have any ideas on these knocks I'm experiencing? Cheers |
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09-21-2019, 06:05 AM | #26 | ||||
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09-22-2019, 08:49 AM | #27 |
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Bootmod3 Customer support came back to me and suggested I try the stage 1 91 map (which they've given me a map credit for! ).
Reported that the issues are probably due to bad octane and/ or excessive iat. IAT I can totally understand - as there are knocks when IAT is over 110f. However some are when IAT is much lower (eg 89f). Re fuel, its on its second tank of shell vpower 99RON, so I'm not convinced that that's an issue tbh. I'm happy to try the 91 map but do have concerns that it'll be less powerful overall than stock (when running decent fuel) . I'll have to visit the dyno and compare them. |
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09-22-2019, 04:17 PM | #28 |
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You can log the stock tune as well. Just flash back to stock but don't lock the DME. Then you could compare knock frequency between tunes. I bet you get similar knock on stock tune with your octane.
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09-22-2019, 04:42 PM | #29 | |
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09-23-2019, 03:22 AM | #30 | ||
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However, just in case there was a fuel issue as you suggest, I logged again this morning. On the 99RON I had just one knock on the stock tune over the same drive. Will try the stage 1 91 map later. |
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09-23-2019, 03:29 AM | #31 | |
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However switching to lesser map and or running a couple of tanks SVP 99RON with a 1/2 bottle of boostane in each is way cheaper initially to help understand your knock issues. Are the knock events across all cylinders or focussed on specific cylinder(s) ? If say cyl 6 perhaps switch coilpacks around to see if knock stays with cyl 6 or moves to where you've put cyl 6 coilpack.
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09-23-2019, 06:13 AM | #32 | |||
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Cheers BP. |
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09-23-2019, 08:32 AM | #33 | |
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09-25-2019, 01:48 AM | #34 | ||
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In the manual, the two sliders for duration are one labelled just as "duration" and then the 2nd is labelled "duration (sport)". I think the label in the more recent app might be wrong for the first slider. I did up the aggression by 0.5 for each and there is very noticeable burbles in comfort now - I will try turning the first slide down. |
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09-27-2019, 05:38 AM | #37 |
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Wow - crazy finding in the logs last night.
In my ignorance of engine management, at the start of this I saw knocks and freaked out with little understanding of how to read these events. My immediate response was to go and put in some "better" fuel (was on sainsbury 97RON and then filled with shell vpower 99- supposedly the best fuel in UK forecourts) . It seems though that marketing is more powerful than reality - the next logs (on the shell vpower) were actually worse - significantly worse with large knocks where timing had to be retarded 6, 8, 10 or even 15 degrees in one case. These are bad knocks! And prompted moving back to the stage 1 91 map. However, after doing some reading and then re looking at the first logs on stage 1 93 with sainsbury 97RON, the log is actually fine with the knocks rolling back only 2-3 degrees, which it appears is quite normal and to be expected as the engine finds the edge of knock (where the most power and efficiency is made). So to sum it up, shell vpower locally sucks! Sainsbury fuel is better! Go figure!! |
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09-27-2019, 06:17 AM | #38 | |
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If Sainsbury's 97 is working OK then great. Do you have a Tesco nearby that sells Momentum99 ? I ask as that was the go to fuel before SVP 99 came along. Do you reset throttle body adaptions - TBA - when switching maps ? In my experience, TBA reset helps to reduce DME re-learning time
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09-27-2019, 11:02 AM | #39 | |
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09-27-2019, 03:17 PM | #40 | ||
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Re tesco 99, I won't put that fuel in the car - have a few times but it always felt a bit rough (this was before I had logging ability) Cheers. |
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09-27-2019, 03:19 PM | #41 |
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I found this page super useful for understanding knock better and what's acceptable:
http://www.motorsport-developments.c...Detection.html |
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09-29-2019, 03:51 AM | #42 |
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Hi,
Soz for delay. Here are the links to the analysed Excel logs- these are all on BM3 Stage 1 93: Sainsburys 97RON Log 1: https://1drv.ms/x/s!Aq_A7z7a4QFzg5tK...NV7ow?e=0kNiHv Log 2: https://1drv.ms/x/s!Aq_A7z7a4QFzg5tM...PghcQ?e=lwNBCl Shell SVP 99: https://1drv.ms/x/s!Aq_A7z7a4QFzg5tW...Lbb9g?e=PIIki4 |
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09-30-2019, 08:46 AM | #43 | |
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To interpret datalogs, you need to have full run from <2000rpm to redline with wide open throttle (WOT) in 3rd gear or above with DSC fully off.
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10-01-2019, 02:06 PM | #44 | ||
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In any case, in sport and sport + the logs show significant knocks with svp and minor ones with 97ron, so I will stick with that instead. Bm3 support also thought there could be a potential fuel issue. 93aki = 97.4 RON so it's not very far from spec at all. |
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