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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > All COBB Tuning AccessPORT Flash for N54 335i Discussion Here



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      08-14-2012, 01:36 PM   #6007
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Originally Posted by MTR View Post
After looking at some logs I was wondering if there was an IAT threshold where the motor will begin to pull timing because the air charge is too hot? I'm sure it's just one factor of many but just a rough value like anything over 140 F is bad, etc.

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Yes there are. In fact, it's a little more complicated than that. There are desperate tables that work together to offset timing at high IATs. I'm stuck and work and don't have access to ATR right now, if someone would post screen shots of those two tables it would helpful for you to see what's going on.

Basically one table establishes the set points(temps) and how much factor it applies(say .3 just for example) and the other table is the amount of timing pulled that is multiplied the factor(say 5 degrees.) So that's .3 x 5 = 1.5 degrees of timing pulled.
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      08-14-2012, 01:44 PM   #6008
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Yes there are. In fact, it's a little more complicated than that. There are desperate tables that work together to offset timing at high IATs. I'm stuck and work and don't have access to ATR right now, if someone would post screen shots of those two tables it would helpful for you to see what's going on.

Basically one table establishes the set points(temps) and how much factor it applies(say .3 just for example) and the other table is the amount of timing pulled that is multiplied the factor(say 5 degrees.) So that's .3 x 5 = 1.5 degrees of timing pulled.
OK if you get a chance to post those later I would be interested in looking at them.

One follow up question. When I collected my logs I clicked the Traction Control button in the car once to disable the traction control, but I didn't hold it down to disable stability control. It looks as if the Actual Boost went above the Requested Boost level and it closed my TPS (TPS act went from 80.9% to 39.4% then back up). Will the car still close the TPS on me if I totally turn off traction control and stability control?

Thanks
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      08-14-2012, 01:56 PM   #6009
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OK if you get a chance to post those later I would be interested in looking at them.

One follow up question. When I collected my logs I clicked the Traction Control button in the car once to disable the traction control, but I didn't hold it down to disable stability control. It looks as if the Actual Boost went above the Requested Boost level and it closed my TPS (TPS act went from 80.9% to 39.4% then back up). Will the car still close the TPS on me if I totally turn off traction control and stability control?

Thanks
In that case completely disabling TC won't help your throttle closures. The DME uses the throttle plate to control boost in an over boost situation.
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      08-14-2012, 03:49 PM   #6010
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In that case completely disabling TC won't help your throttle closures. The DME uses the throttle plate to control boost in an over boost situation.
Thanks for the education Cloud that's good to know.

One last newb question for the day. I'm trying to understand the interaction between "Timing Cyl #" and "Cyl# Timing Cor". So the DME wants to advance the "Timing Cyl" to 6.75 degrees while under boost but will hold it back for various things such as high CAT. Will the "Cyl Timing Cor" only kick in once the Timing Cyl has been reduced to 0?

If my logs have all 0s under Timing Correction, that still doesn't mean that the tune is running well right? I would also need to check the Timing to see if it's advancing to 6.75 degrees?

I hope that makes sense.
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      08-14-2012, 04:33 PM   #6011
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Thanks for the education Cloud that's good to know.

One last newb question for the day. I'm trying to understand the interaction between "Timing Cyl #" and "Cyl# Timing Cor". So the DME wants to advance the "Timing Cyl" to 6.75 degrees while under boost but will hold it back for various things such as high CAT. Will the "Cyl Timing Cor" only kick in once the Timing Cyl has been reduced to 0?

If my logs have all 0s under Timing Correction, that still doesn't mean that the tune is running well right? I would also need to check the Timing to see if it's advancing to 6.75 degrees?

I hope that makes sense.
Timing corrections determine your actual timing. If the timing table wants 8 degrees at 5K rpms and then you have a timing correction of -3 then your actual timing will be 5. If you have 0 timing corrections, and your timing isn't being reduced due to IATs, then your actual timing will be 8. If you can find a log with timing corrections and timing logged on a channel when that correction happens it will be easy to see the relationship between the two.

If you are having 0 timing corrections thats a good sign that the car really likes the map. There's more to it than just timing corrections, but that is a big part of it.

Hope that made sense, I'm not great at explaining things. When I get home I'll get some screen shots and post them up to help understand timing.
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      08-14-2012, 05:00 PM   #6012
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Timing corrections determine your actual timing. If the timing table wants 8 degrees at 5K rpms and then you have a timing correction of -3 then your actual timing will be 5. If you have 0 timing corrections, and your timing isn't being reduced due to IATs, then your actual timing will be 8. If you can find a log with timing corrections and timing logged on a channel when that correction happens it will be easy to see the relationship between the two.

If you are having 0 timing corrections thats a good sign that the car really likes the map. There's more to it than just timing corrections, but that is a big part of it.

Hope that made sense, I'm not great at explaining things. When I get home I'll get some screen shots and post them up to help understand timing.
OK that makes sense to me. So is there really a need to log Timing Cyl. # if you are logging all 6 timing corrections?

I just did a couple more pulls and changed what I logged from the default. I added Timing Cor. (CAT/ECT). I assume this is the correction for Charge air temp being too high or engine coolant temp? I saw it start to pull timing after my CAT got to 113 F, but that correction didn't show up in any of the Cyl# Timing Cor fields. Is that normal?

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      08-14-2012, 05:04 PM   #6013
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OK that makes sense to me. So is there really a need to log Timing Cyl. # if you are logging all 6 corrections?

I just did a couple more pulls and changed what I logged from the default. I added Timing Cor. (CAT/ECT). I assume this is the correction for Charge air intake being too high or engine coolant temp? I saw it start to pull timing after my CAT got to 113 F, but that correction didn't show up in any of the Cyl# Timing Cor fields. Is that normal?
As long as you log all 6 timing corrections and 1 cyl timing channel you will know timing on all 6 cylinders.

Yes, the timing correction(cat/ect) is the channel displaying the IAT and engine coolant temp corrections. Those corrections are applied globally and do not appear as timing corrections.
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      08-14-2012, 05:41 PM   #6014
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As long as you log all 6 timing corrections and 1 cyl timing channel you will know timing on all 6 cylinders.

Yes, the timing correction(cat/ect) is the channel displaying the IAT and engine coolant temp corrections. Those corrections are applied globally and do not appear as timing corrections.
Excellent. Thanks for the explanation, you've cleared up a lot of my concerns.
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      08-15-2012, 10:20 AM   #6015
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Excellent. Thanks for the explanation, you've cleared up a lot of my concerns.
Here's a pic of the Timing tables responsible for IAT induced timing reductions
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      08-15-2012, 04:11 PM   #6016
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New Cobb user here...installed Stage 1 Aggressive.

I currently run ~1.25 gallons E85, the rest 93.

I'd like to record some logs just to make sure I'm pushing anything too far.

I'm curious - what are the preferred or relevant items to log?
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      08-15-2012, 04:58 PM   #6017
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New Cobb user here...installed Stage 1 Aggressive.

I currently run ~1.25 gallons E85, the rest 93.

I'd like to record some logs just to make sure I'm pushing anything too far.

I'm curious - what are the preferred or relevant items to log?
Use the default logging channels. Add STFT bank 1 and LTFT bank 1
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      08-15-2012, 05:54 PM   #6018
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Use the default logging channels. Add STFT bank 1 and LTFT bank 1
What are both of those? And what should you be looking for?
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      08-15-2012, 06:27 PM   #6019
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Long and short term fuel trims. Running just a couple gallons of E85 isn't going to hurt anything, and the only thing it will help is if your base gasoline is crap (like in Arizona, California, and Nevada).

Basically, you don't want your STFT to ever be 34% (max) and ideally it should be under 20%. You won't have to worry about getting near that with just E15 (which is about what you're running with that mix). If you really want, download AccessTuner Race and modify the map to use a fuel scalar of 1.03.
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      08-15-2012, 08:47 PM   #6020
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hey guys around how many HP should my car get with 95 RON(although im not sure if its really in RON in saudi arabia)=91 octane

1.cobb stage 2
2. vrsf 3" dp
3. stett cai
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      08-15-2012, 09:31 PM   #6021
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hey guys around how many HP should my car get with 95 RON(although im not sure if its really in RON in saudi arabia)=91 octane

1.cobb stage 2
2. vrsf 3" dp
3. stett cai
Check COBB's website & look for the Map Notes section. It'll give a dyno graph with estimated power numbers
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      08-16-2012, 07:28 AM   #6022
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Long and short term fuel trims.

Basically, you don't want your STFT to ever be 34% (max) and ideally it should be under 20%. You won't have to worry about getting near that with just E15 (which is about what you're running with that mix). If you really want, download AccessTuner Race and modify the map to use a fuel scalar of 1.03.
So you don't want STFT to be above 34%, what about LTFT? Anything to look for there?
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      08-18-2012, 09:41 AM   #6023
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Did a 3rd gear pull to check STFT and LTFT. Can someone please interpret the log for me?

A few things I noticed:

1. Looks like the TPS closed on me twice as actual boost crept above requested boost. Is there anyway to avoid this?

2. Pulling some timing as CAT got above 113 F. How much HP does pulling a degree or two of timing equate to?

3. Boost tapering to 9 PSI towards redline. Is this much of a drop off normal?

4. Am I too lean on spool up? At 3900 RPMs I'm already at 13.5 PSI but my A/F is still ~13.0. Shouldn't it be closer to 12 at this point or is that only at higher RPMs? Is this connected to the STFT? It hits 27, well above the 20 that was recommended as ideal.

Thanks for the help.
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      08-22-2012, 12:21 AM   #6024
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Question Data Logging Glitch

After the AP Firmware Update 1.6.5.0-4519, my data logging appeared to be normal on 8-15.

I typically use "boost" as my on screen view when data logging.

but tonight when trying to select "boost" as my on screen view when data logging, it wouldn't engage. It said "logging" for a split second then went back to the main menu. Data logging with "WDGC" as my on screen option work as normal, but not the "boost" I didn't try any others.

Anyone experienced this before?
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      08-22-2012, 04:48 PM   #6025
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There's a new update (v1.6.5.0-4570), so maybe give that a shot.

I haven't had your specific problem, but I do remember having a problem with the AP just dropping communication with the ECU whilst logging. I haven't had the issue the last few times though, so perhaps it was fixed with a later firmware.
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      08-22-2012, 04:54 PM   #6026
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I'm not sure if this question has been asked before. I wasn't sure what to search for so here goes. If a car as the COBB tune installed, is it possible for another person to re-install the tune from another AP?
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      08-22-2012, 05:14 PM   #6027
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I'm not sure if this question has been asked before. I wasn't sure what to search for so here goes. If a car as the COBB tune installed, is it possible for another person to re-install the tune from another AP?
NOPE. Once it's Installed, it's "married" to that car until you Uninstall the tune
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      08-22-2012, 05:26 PM   #6028
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NOPE. Once it's Installed, it's "married" to that car until you Uninstall the tune
Thanks for the clarification. Also, if let's say you get into an accident where you aren't able to turn on the ignition to get a "divorce" from the AP lol, then are you SOL?
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