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Log Attached - Cobb - Oscillation - Suttering - 4th Gear - Low Rpm - Full Boost
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10-02-2012, 10:44 AM | #23 | |
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10-02-2012, 10:55 AM | #24 | |
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Ænema was nice enough to offer assistance and I pm'd him so hopefully I can make some progress with his assistance. I'll be sure to post updates so the community can benefit from this knowledge. Depending how far we get i may or may not opt to get an etune. |
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10-02-2012, 03:35 PM | #25 |
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mine is basically fixed after 7 revisions :-) E50 map
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07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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10-02-2012, 07:27 PM | #26 |
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Corrections made to WGDC base
With Ænema's help I was taught how to adjust my WGDC Base. Before I install it and test it out on the road just want to make sure I didn't screw up. I mostly focused on Boost Mean vs. Requested Boost and were i saw boost mean overshoot requested boost I reduced the closest corresponding value in the WGDC Base table by 5% unless indicated differently below.
There was one spot at around 280 MAF and 2.167 setpoint where I saw some throttle closures evidenced by TPS Act% going under 80.98 accompanied with boost mean overshooting requested boost as well so I reduced this value by 7.5% At around 240 MAF and 2.073% setpoint there were more severe discrepancies between boost mean and boost requested so I also reduced this value by 7.5% Attached are a graph of my before log and the an excel of the corresponding data as well as a screen shot of ATR AFTER the edits were made. How did I do? |
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10-02-2012, 07:56 PM | #27 |
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Looks good man, keep in mind that the first attempt probably won't fix it and it's going to be "rinse and repeat" process. Also, it's a good idea to reduce the values in the immediately surrounding cells. The WG adder tables should take up the slack if you remove a touch too much so don't be too hesistant to reduce the base table values(don't go crazy, of coarse.)
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10-02-2012, 08:45 PM | #28 | |
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Cool - thanks for the confirmation. Now I totally understand the methodology. I'm gonna take her out for a spin and do some more logging and tweaking. I'll keep the thread updated. |
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10-02-2012, 09:25 PM | #29 |
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haha well if your mod addicted like I was at one point, well almost a year ago, just wait to see how much different your beast is going to sound with a set of catless downpipes, intercooler and some sort of exhaust set up. No need to buy an exhaust because its honestly a waist of money, in my personal opinion. Just cut the secondary cats or buy a mid section exhaust and leave the OEM style muffler on, if you want the "quiet" car ( I recommend changing the tips to a 3.5" or a 4.0"). If you want it to be louder I suggest cutting the OEM muffler off as well as secondary cats and replace the secondarys with a set of vibrant resonators ( I hear the ultra quiet ones sound very good and takes the rasp away). They make different kinds but this takes ALOT of the drone away and with catless downpipes, secondary cat delete, vibrant resonators, with straight pipes all the way back, sounds pretty damn good. I would have went this route but I was an idiot and didnt know much when I started this project
so just some friendly advice and our cars, well N54's in general or any forced induction car loves the least back pressure possible.. Less back pressure = more flow, and more flow means more air from your CAI to spin those snails and make alot of BOOST
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[SIZE="2"]Crimson Red E92 335i M-sport 6-speed with MHD custom stage 2+ flash only , 40% E85/93 mix,+ HRE P40S wheels, KW Clubsport, M3 sways,+BMW performance CF Mirrors, BMW Performance CF deck lid spoiler,+ CF interior trim, p3 vent boost gauge,+ LUX angel eyes (11.73@124mph on street tires)
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10-02-2012, 10:20 PM | #30 | |
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LOL....that's dangling a crack rock in front of a crack addict! Trust me dude, I'm tempted. I'm just being a pussy cause I have 3 years left on CPO and I'd like to keep it in place should I need it. I know I'm already taking a small risk with the Cobb and I'll prob play it safe a throw my stock air box if I have to take a trip to the dealer. Intercooler is very tempting as that is something that's easy to swamp in and out. Down pipes might be pushing but hey talk to me in a month and I'll prob be craving more power. This is a big step up from my previous car which was a bone stock 350Z |
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10-02-2012, 10:28 PM | #32 |
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2nd Revision - Did I make it worse??
Seeing more oscillations in the lower RPM range. That can't be good. Was I too aggressive on my tweaks? Did i go overboard in editing adjacent cells? Please help!
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10-02-2012, 11:50 PM | #33 |
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Those oscillations are probably best resolved/caused but the PID tables in the WGDC tables. Unfortunately, I haven't had any oscillations myself(and in turn haven't had to work on a "fix" for it) so I don't want to lead you wrong here. I'm fairly sure the P factor is the culprit here but I don't want to say for sure. I think you should get in touch with the user "joshboody", I know he has had to work on this problem and I believe he has a good fix for it.
EDIT: I went through ATR and I'm thinking if it were me the steps I would take would be: to log Boost error P factor and where the boost oscillations are occuring I would reduce the value in those cells in the WGDC P factor table. I would be fairly aggressive(maybe 25% or so each time.) However, that's just me thinking out loud and I'm not guaranteeing that will fix the oscillations. Last edited by Ænema; 10-03-2012 at 12:10 AM.. |
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10-03-2012, 01:11 AM | #34 |
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maybe you could just take the stage 1+ map and basically modify it by running the same load target and timing as stage 1 ?
or copy all WGDC table from stage 1 + and port them to stage 1?
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10-03-2012, 07:33 AM | #35 |
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That's not a bad idea being that stage 1+ is 4.02 with oscillation fixes....something to think about
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10-03-2012, 07:34 AM | #36 | |
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10-03-2012, 08:05 AM | #37 | |
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From what i understand, P-Factor is given "authority" to correct underboost or overboost conditions. So depending on how aggressive the factor is, it can slingshot up and down which is why you get the oscillations. |
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10-03-2012, 09:03 AM | #38 | |
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Thanks for another point of view |
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10-03-2012, 09:06 AM | #39 |
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Pro Tuning Freaks - Here I come!
Everyone has been great and really helpful. I have learned a lot but the learning curve is pretty steep and seems like there is no one best way or a quick generic fix as everyone's hardware and conditions are slightly different.
For $200 buck pro tuning freaks makes a lot of sense. I shouldn't be owning a bimmer if I can't part with $200. That should smooth out the oscillations and if I pick up a little bit of safe power in the process that's even better. I'm gong to purchase an e-tune and I'll let everyone know how it goes! |
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10-03-2012, 09:37 AM | #40 | |
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So, in theory, if one was to just continue the process of reducing the WGDC base table you will eliminate the oscillations by eliminating the need for the P table to intervine. Any thoughts? |
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10-03-2012, 09:43 AM | #41 | |
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PTF are great guys and i have seen a few datalogs of their maps and they look absolutely beautiful. |
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10-03-2012, 10:47 AM | #42 |
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Hey, I looked over things briefly and have a suspicion. In one of your revised maps I noticed you edited the lower MAF cells... these should NOT need adjusting. I think you may have mistakenly referenced g/s MAF in the log to kgh in ATR. Adjust ATR to g/s in display options, if this was your mistake and start over.
The cells you will be editing are only really a handful around 170+ g/s at your setpoints. Only adjust under WOT fully spooled at this time... you can move to part/spool later. For PID, I think it would be good to start a thread on this. Generally, for p-factor, you'd want larger values for +error and lower for -error... its better to be short of your target. It would be great to have some engineering type input here. NOTE: I do run ATR, but I control boost with procede (along with other things), so I only have limited first hand experience. I just try and help because I want more people making their own adjustments... its not so hard when you have a pool of people gathering experience together. There's not that many adjustments you can make really. |
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10-03-2012, 11:08 AM | #43 | |
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I'm interested in learning how to dial in boost, dial out overshoots... I don't have them anymore with my custom tune but would like to know how to do it. Would you mind posting a paragraph explaining what to do?
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10-03-2012, 12:45 PM | #44 | |
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My stock turbos are pretty healthy and not very picky so I haven't had to make a lot of changes. I have a set of TD04s on the way, when they get installed I have a felling I'm going to be spending a lot time in the WGDC tables haha |
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boost, cobb, oscillation, stuttering, tune |
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