02-21-2019, 03:33 AM | #1 |
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Bootmod3 stage 1 "stutter" "Hesitation" under WOT
Here are some datalogs from my car when under WOT a stutter occurs. The rpm kicks backwards and it hesitates. These data logs show 3rd gear pulls, 2nd gear pulls, 5th gear pulls. I sent them to bootmod3 two days ago. still waiting to hear back. In the mean time i wanted some other insights. with these logs i have stock chargepipe and oem spark plugs with 70k miles. only mod is afe pro dry drop in filter and air scoop. Next Wednesday i am getting the Evolution Racewerks Charge pipe installed, and NGK spark plugs that are gapped at .18 like bootmod3 recommends Thanks for any help!
http://www.bootmod3.net/log?id=5c6b4219ae729b792d308250 http://www.bootmod3.net/log?id=5c6b4219ae729b792d308250 http://www.bootmod3.net/log?id=5c6b3f56ae729b792d308248 http://www.bootmod3.net/log?id=5c6b3f19ae729b792d308247 http://www.bootmod3.net/log?id=5c6b4157ae729b792d30824d http://www.bootmod3.net/log?id=5c6b4022ae729b792d30824b http://www.bootmod3.net/log?id=5c6b3ed0ae729b792d308245 here are the links because when i try to upload them it just says upload failed. and link upload failed. lol Last edited by 13blk335ix; 02-21-2019 at 03:39 AM.. |
02-21-2019, 11:08 AM | #2 |
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Thats a lot of boost for stage 1 ots map.. I see you are 6mt... what version of the ots map are you running? Seems like starting with v7.1 of the stage 2 ots map for pwg cars a lot of 6mt cars started having issues in that rpm range (3500-4000rpm) where peak torque occurs.
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02-21-2019, 01:50 PM | #3 |
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yes good eye I have a 6mt. I don't know how to read graphs past like whats on the left and bottom and how high or low the line reaches. this is my first tune on any car. you just offered something I didn't know and I am thankful. being that they look like high boost pressure for stage 1 and that it was common for other 6mt. the funny thing is sometimes I can get clean pulls with no stutter all the way through the powerband while shifting. but when im at a roll and floor it in 4th or 5th it stutters. I will check what version of the tune I am running and post back. thanks for the insight!
also, just got home from getting my resonator delete I LOVE IT and for anyone wondering there is zero drone from just stock 335i f30 n55 exhaust. where as when I had my muffler delete the drone was unbearable. the mufflers on these cars do work when it comes to drone. |
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02-21-2019, 01:56 PM | #4 |
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UPDATE: bootmod3 got back to me and said once I get the evolution chargepipe installed and the ngk spark plugs installed and gapped to get ahold of them to make a custom tune with less boost.
wondering if anyone can read these graphs and make anything out of them and what is causing me to loose boost? I mean I might have a leak I don't think so. but can anyone look at the graphs and figure out what might be failing? thanks |
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02-21-2019, 06:09 PM | #5 |
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One thing is certain- the stock charge pipe is getting ready to be blown to smithereens.
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02-21-2019, 06:37 PM | #6 |
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02-25-2019, 07:25 PM | #7 | |
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02-25-2019, 07:27 PM | #8 | ||
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02-27-2019, 06:58 PM | #9 |
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update: I got the chargepipe and NGK spark plugs gapped at .024 installed today. NO MORE HESITATION UNDER WOT! The problem is fixed! thanks for the input on the gap size! no problems at idle.
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02-27-2019, 07:49 PM | #10 | |
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Why did you gap the plugs to .024 instead of .02 or .018 like bm3 recommends?
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02-27-2019, 07:54 PM | #11 | ||
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he read my graphs and gave me the most insight on the situation so I took his advice and went with .024. my car is running perfect! way better than before! |
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03-28-2019, 10:51 AM | #12 |
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The problem is still persisting, I sent bootmod3 logs. I now have the er chargepipe, wagner catless downpipe, Ngk plugs installed
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03-28-2019, 12:52 PM | #13 |
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Clutch slipping.
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04-01-2019, 12:20 PM | #14 |
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Any updates on this? My car does the same thing. I noticed that the first couple of days after flashing, it runs fine. Afterwards, it starts to hesitate. I haven't had the chance to do logs yet.
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04-01-2019, 03:48 PM | #15 |
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bootmod3 gives very little insight. after sending them logs the only response I got was "when was the last time you changed your coils"?
I gave my maf a bath just to knock one more thing off the list. I'm basically at getting new coils, then if it persists getting a stage 2 clutch. my advice if you have a 6mt (I do) ease into the throttle around 3k rpm. then floor it at 4k rpm. I have found that if I floor it at 4k rpm then there is no hesitation. it's when I floor it at 3k it kicks back around 3.4k then continues to pull at 3.8k. i just keep the rpms high now and then floor it. |
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04-01-2019, 04:53 PM | #16 |
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Car needs to be up to date with maintenance to properly assess what's wrong, leaving plugs ect beyond factory intervals is asking for trouble. Anyone flashing and not logging immediately is gambling with their engine, you could have knock or brutal timing pull and be none the wiser.
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04-01-2019, 04:56 PM | #17 | |
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I believe you've just posted the fix to your issue. It's not the coils or the clutch. The issue you're having is very likely the high load, low rpm issue we discussed in the other thread. Mash the throttle in 3rd or the higher gears at sub 3,500rpms in a 6MT and it's likely creating a quick and momentary over-boost situation and the DME is taking safeguards to stop a LSPI/super knock event. If you want max power and acceleration, then grab the correct gear to reduce the load. Automatics have far deeper gearing that reduces load on the motor/turbo thus reduces the potential for a disastrous over-boost ramp up. 3rd gear in the 6MT winds out to around 106-108mph. 3rd on the 8AT winds out to something like the upper 80s and 4th maxs out around 110mph to give some perspective on just how much more gearing advantage/multiplication the 8AT has. If the the coils or clutch were the culprit, the issue would be happening at other times as well, especially the coils. It wouldn't be a bad idea to replace the coils if they are still the originals as they only last 5-6 years, especially in tuned turbo BMWs. Seeing your car is a 2013 means it was likely in service in 2012.
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Last edited by XutvJet; 04-02-2019 at 12:19 AM.. |
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04-01-2019, 08:43 PM | #18 | |
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Well said! Also, 100% agree with your signature... .
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04-04-2019, 02:52 AM | #19 |
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yes I have watched on youtube how the automatic transmission behaves and the rpms stay around 4k. I have been shifting down and 3rd has no problems. when in 4th i make sure the rpms are above 3,800 or 4k and have no stutter. thank you for clarifying this issue. I have been enjoying my car even more now with this info. I will be changing coils next Thanks
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07-25-2019, 08:47 PM | #20 |
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got xdi 35 hpfp because bm3 said my stock hpfp was not keeping up. took new logs. posting them tonight. new spark plugs and ignition coils too
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07-25-2019, 10:27 PM | #21 |
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here are logs from tonight with xdi 35 hpfp and still experiencing stutter, bm3 said before the stutter was from hpfp so i upgraded it.
http://www.bootmod3.net/log?id=5d3a572fc090c65e9f4f92b2 http://www.bootmod3.net/log?id=5d3a575cc090c65e9f4f92b3 thanks |
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07-26-2019, 10:40 AM | #22 | |
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