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      04-10-2012, 02:04 PM   #1
flexinator
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logging with Cobb AP

I looked around to try to find a "how-to", but couldn't find something that told me what I want to know.

Basically, if I want to log some runs with my tune on my car, what parameters should I turn on in the Cobb menus. Then, what am I looking for when I take a look at it. Here is a run that I tried earlier, but I'm just wingin it so to speak.

Thanks.

i changed the .csv file to a .doc file...
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File Type: doc datalog2.doc (17.2 KB, 53 views)
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      04-10-2012, 02:05 PM   #2
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Boost
RPM
TPS
Ignition
Air Fuel
IAT
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      04-10-2012, 02:08 PM   #3
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Does it matter which cylinder? Should I pick more than one?
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      04-10-2012, 02:11 PM   #4
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Logging all the cylinders would be quite a tedious task. Most people choose 1 or 6. or whichever seems to be noisy.
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      04-10-2012, 02:17 PM   #5
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If you want to graph your csv's, paste the data into here:

http://www.javalotte.com/csvgraph/
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      04-10-2012, 02:55 PM   #6
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so here is my data. looking at the timing it seems to slowly climb. The boost never goes much over 14 psi. What else am I looking at? What would be a warning sign?
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      04-10-2012, 02:58 PM   #7
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Which map are you running?
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      04-10-2012, 02:58 PM   #8
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Seems clean. Is this stage 1 sport?
I usually log timing on all cylinders. you want to also add Charge air temperature, TPS. WGDC is nice to have as well
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      04-10-2012, 03:00 PM   #9
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Logs look good. That is the normal timing for this car.
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      04-10-2012, 03:08 PM   #10
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That is v401 aggressive, stage I. I just clicked on a few buttons and hit go on the way home from work. I'll try a few more later this week. My friend has downpipes and FMIC and let me take his for a ride yesterday... I think I need to do some more upgrading...
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      04-10-2012, 03:12 PM   #11
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Your timing looks much better than mine, im getting dropouts like a mofo on stage 1 agg. Would like to see your IAT's as i suspect florida heat is killing me right now.
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      04-10-2012, 03:15 PM   #12
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regraph... it turns out I had a lot of things on there... so I'm not sure what tps or wgdc even means... any help there?
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      04-10-2012, 03:18 PM   #13
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tps = throttle position sensor. So why does in end at 80% Does that mean i have another 20% to go?!?! I am going to go look under my pedal and see what's jamming it up (i'm only half joking, I may just go look) Someone fill me in here...
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      04-10-2012, 03:20 PM   #14
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Quote:
Originally Posted by flexinator View Post
regraph... it turns out I had a lot of things on there... so I'm not sure what tps or wgdc even means... any help there?
throttle position and wastegate duty cycle.
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      04-10-2012, 03:21 PM   #15
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wgdc = wastegate duty cycle. What does this graph even represent? I thought the wastegates just were open or closed. And on full throttle I would think fully closed. Again, I need someone to fill me in....
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      04-10-2012, 04:23 PM   #16
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Quote:
Originally Posted by flexinator View Post
tps = throttle position sensor. So why does in end at 80% Does that mean i have another 20% to go?!?! I am going to go look under my pedal and see what's jamming it up (i'm only half joking, I may just go look) Someone fill me in here...
no 80% is full throttle

Quote:
Originally Posted by flexinator View Post
wgdc = wastegate duty cycle. What does this graph even represent? I thought the wastegates just were open or closed. And on full throttle I would think fully closed. Again, I need someone to fill me in....
the WGDC logs the signal that modulates wastegate operation to achieve requested boost. Wastegates are not fully closed under full throttle. Set your AP fr live monitoring and set it to WGDC and take a look at how the wastegates are operated under idle/casual/WOT conditions
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      04-10-2012, 06:19 PM   #17
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Quote:
Originally Posted by flexinator View Post
tps = throttle position sensor. So why does in end at 80% Does that mean i have another 20% to go?!?! I am going to go look under my pedal and see what's jamming it up (i'm only half joking, I may just go look) Someone fill me in here...
80% is fine. The importance of throttle is to see if you have throttle closure from a boost over-shoot.

Your logs look great. Just drive

Let me know if you need any help with parts getting to stage 2+
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      04-10-2012, 09:28 PM   #18
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Quote:
Originally Posted by Jeff@topgearsolutions
Quote:
Originally Posted by flexinator View Post
tps = throttle position sensor. So why does in end at 80% Does that mean i have another 20% to go?!?! I am going to go look under my pedal and see what's jamming it up (i'm only half joking, I may just go look) Someone fill me in here...
80% is fine. The importance of throttle is to see if you have throttle closure from a boost over-shoot.

Your logs look great. Just drive

Let me know if you need any help with parts getting to stage 2+
Ok, I am getting throttle closures from boost/load overshooting target all over the place. What can be done about this?

I don't think we have a solution at this time (ATR). Assuming it is due to hardware (stiff wastegates) and can't be optimized with OTS tune.

Also, I mostly see people posting single gear cool night logs. I rarely get timing drops on a single or two gear pulls, but if I let it heat soak and push it with multiple-gear pulls (ex 3-4-5), I am likely to get timing drops on fifth gear. Is that acceptable?
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      04-10-2012, 09:48 PM   #19
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Quote:
Originally Posted by gboop View Post
Ok, I am getting throttle closures from boost/load overshooting target all over the place. What can be done about this?

I don't think we have a solution at this time (ATR). Assuming it is due to hardware (stiff wastegates) and can't be optimized with OTS tune.

Also, I mostly see people posting single gear cool night logs. I rarely get timing drops on a single or two gear pulls, but if I let it heat soak and push it with multiple-gear pulls (ex 3-4-5), I am likely to get timing drops on fifth gear. Is that acceptable?
was traction control fully off when you did these pulls?
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      04-10-2012, 10:05 PM   #20
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I typically log the following, which is a mild departure from the parameters suggested by Cobb in their AccessTUNER tuning guide:

RPM (RPM)
Accel Ped. Pos
TPS Act
Req. Boost Abs. (PSI)
Boost Mean Abs (PSI)
Boost (PSI)
WGDC Bank 1
Charge Air Temp
Timing Cyl. 1
Timing Cyl. 2
Timing Cyl. 3
Timing Cyl. 4
Timing Cyl. 5
Timing Cyl. 6
Lambda (Bank1) (AFR)
Lambda (Bank2) (AFR)
STFT (Bank 1)
STFT (Bank 2)
Torque Limit Active
Fuel Mode


The reason I don't log timing correction is that I can deduce that from the timing in 1-6 as it is. It's imperative you log all cylinders, because a single cylinder pulling timing means next to nothing, but seeing 3+ cylinders with reduced timing is an issue, one that might be missed logging just 1 or 6.

Reference, Cobb's tuning guide:
http://www.cobbtuning.com/v/vspfiles...FinalAlpha.pdf
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      04-11-2012, 06:00 AM   #21
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Thanks. Nope, forgot about traction control... Didn't think it was an issue on an xi in 3rd gear...
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      04-11-2012, 11:54 AM   #22
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Quote:
Originally Posted by marv85 View Post
was traction control fully off when you did these pulls?
I do my logging with DTC off, and don't see the reason why disabling DSC would make any difference on smooth highway straight line pulls. However, I did some logs today with fully disabled DTC+DSC and still get load overshoots with corresponding throttle closures (highway speeds).

The tune feels great otherwise, but it would be perfect without the boost spikes. I am currently attributing my timing pulls to the last 2 injectors that were not replaced with the recall. Those two cylinders are usually more noisy than the others.
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