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08-17-2011, 08:43 PM | #1 |
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Vehicle:2006 WRX Limited OBP |
Boost spike to ~16 psi normal?
Hey everyone, I want to say ahead of time, I am no tuner. I would love to learn though!
Here's my issue. Loaded my Accessport on my car with the Stg. 1 93 octane map. Drove around normally (no WOT or hard pulls) until my DAM was at 1. After the ECU relearned its parameters, I made a few WOT pulls and was getting Boost Spikes to about 15 PSI. It would spike for just a second and then drop back to 14.2 and hold till redline where it would taper to ~ 9-10 PSI. AFR's were 10.8:1. Fast forward to today. Installed my Cobb SF intake and airbox. Made some pulls and now AFR is 11.1:1, and Boost Spikes to ~16 PSI but doesnt drop back down until ~ 3200 RPM (~5 second later). After the spike it stays at a steady 14.6 until redline where it tapers to ~10-10.5 PSI. This is on an 06 WRX. Mods are: Invidia G200 CBE Intake Silencer Delete Cobb Sf Intake and Airbox Cobb Accessport V2 Is there something wrong with it spiking like that?
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08-17-2011, 09:17 PM | #2 |
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is the tune made for the cobb intake? you said it ran good until you installed that.
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08-17-2011, 09:50 PM | #3 | |
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08-18-2011, 05:13 AM | #4 |
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Bump it up
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08-18-2011, 08:41 AM | #5 | |
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Can you data log a 3rd gear run from around 2500 RPM to near redline (if you can do so safely)? Use the default logging set (and make sure you are running the latest AccessPORT firmware). Here's a general video that describes how to use the AccessPORT for logging: Here's a video that describes how to update your firmware: http://www.cobbtuning.com/info/?id=6006 Also, are you using a wideband o2 to determine AFRs or just monitoring the front o2 sensor? Bill |
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08-18-2011, 09:33 AM | #6 | |
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As far as monitoring AFR goes my Accessport is within .1 of my WB O2. Ex. My Accessport says 11.1 and my WB says 11.0. Edit: the original AFR readings in the OP are from my WB O2. The WB is located on the number 4 exhaust runner. Last edited by 2Fast4U1DAY; 08-18-2011 at 09:51 AM. |
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08-18-2011, 04:43 PM | #7 |
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Here's the requested Log
It didnt load it right. What do I have to do to make the columns stay? They ended up just being in a huge line...
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08-18-2011, 05:19 PM | #8 |
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dang it lol
Last edited by 2Fast4U1DAY; 08-18-2011 at 05:21 PM. Reason: tried using code it didnt work |
08-18-2011, 09:20 PM | #9 |
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Well I have the log, I just cant figure out how to post it right. Any help would be greatly appreciated.
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08-18-2011, 09:37 PM | #10 |
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08-18-2011, 09:49 PM | #11 | |
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08-19-2011, 08:41 AM | #12 |
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Will have the log posted up later today. I'm at school and the stupid filters here wouldn't let me download the AP manager, so I will have to wait till I get home.
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08-19-2011, 08:44 AM | #13 |
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I also noticed today that the spike doesnt really occur unless I'm making a 4th gear pull. I will make a log and post that as well.
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08-19-2011, 05:53 PM | #14 |
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Got the 4th gear pull too...
Here is the third gear pull...
https://docs.google.com/spreadsheet/...hl=en_US#gid=0 And the Fourth... https://docs.google.com/spreadsheet/...hl=en_US#gid=0 Tell me what you think Bill. On the fourth gear pull I couldn't get anymore engine revs because I was coming up on traffic really fast. Anywho I hope this will suffice. I see only a little bit of FKLC and at low RPM/load i see quite a bit of FBKC but its completely random. Sometimes I see it sometimes it never happens. I'm thinking I have a loose turbo heat shield (which will be coming off next week when Andrewtech installs my Invidia DP. I was just basically looking for the "go ahead", that so far everything seems up to "par". |
08-20-2011, 08:14 AM | #15 | |
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Your boost control actually looks quite good except for an initial spike at lower RPM. About the only thing you could do for that (besides getting a custom tune) would be to loosen the wastegate arm a bit (say, start out at half a turn). But, I would just wait until after you get the DP installed and go stage 2 and then do some additional logs (as that is going to completely change the boost characteristics anyway). Bill |
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08-20-2011, 08:50 AM | #16 | |
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08-21-2011, 10:18 AM | #17 | |
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Bill |
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08-24-2011, 11:07 PM | #18 |
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Well I think I might have found the source of the random, high feedback knock corrections.... Turns out when the dealer replaced my A/F ratio sensor, they never bolted the bracket back up. Everytime I mashed the throttle it would vibrate on the side of the engine, and pretty violently too I might add. I bolted it back up where it should be, and by the time I was done it was dark.
I have an appt at Andrewtech tomorrow for my DP install and some other things, so on my way back we will see if it gets any better. I'm in hopes that that was it, because those random high feedback correction numbers was starting to bother me. Last edited by 2Fast4U1DAY; 08-25-2011 at 05:46 AM. |
08-25-2011, 03:10 PM | #19 |
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Bill,
What is the enable criteria for DAM to go to 1? I just drove 140+ miles and it's still at .8. The car feels down on power, and I don't want to lay into it until DAM is where it should be. Thanks again for your help. :-) Edit: my buttdyno must need calibrated. I still dont have DAM at 1 yet but I gave it about 2/3 throttle and it pulls pretty darn hard. Harder than the Stg 1 map at WOT anyways. Hopefully my DAM will get to where it should be soon. Edit 2: It finally went to 1 will Post up my logs from the Stg 2 Map tomorrow after I get a chance to do some logging. Last edited by 2Fast4U1DAY; 08-25-2011 at 08:43 PM. |
08-26-2011, 08:19 AM | #20 | |
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Bill |
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09-10-2011, 11:53 AM | #21 |
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Thread revival. Today I was driving into work and I noticed that the ECU was pulling timing at idle?! Is this an indication of an issue? Its pulling -1.4 degrees of fine knock learn. The really weird thing is sometimes its 0.0 then others it's .7 or 1.0, and it just doesnt make sense to me why sometimes it doesn't pull any, and others, .7,1.0,or 1.4 if it is a learned parameter. Shouldn't it be pretty consistant considering its a learned value?
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09-11-2011, 10:23 AM | #22 | |
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It is normal to see some fine knock learning, especially at low loads/RPM where the ECU is not as effective as distinguishing actual knock from other engine noises. If you start seeing some big corrections in that range on a regular basis like -4.2, -5.6, then there might be some issue (usually it is something rattling in the engine bay if it is near idle). Bill |
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