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COBB tuning?!

littleazn248

Go Kart Champion
Cobb uninstalled ...hopefully the dealer will fix what I suspect is both a PCV leak and valve cover seal leak. I'm hopeful that this plus the R8 Coils/Sparks will lower the knock values.

I guess I accidentally took a datalog, iirc this is on the FWY accelerating from 60mph to 75mph. Just for fun here it is, I will take better logs once my car is fixed.

https://drive.google.com/open?id=0B5Jz2nvDFoR3RTR2V0JoaGJpRGM
 

DASVDUB

Drag Racing Champion
yea, unfortunately most dealer techs are literally book readers. like if the computer doesn't tell them exactly what to do they are lost.

on one of my other cars many moons ago. i had the ring gear separate from the flywheel so the only way to start the car was by pop starting it. it was still under warranty. but I had some time so I pulled the starter to verify. when I dropped it the dealer I told them they will need to replace the flywheel

they call me back two hours later saying the tech looked at it and they are ordering the starter. i said....ask your tech if he looked at the flywheel. he says yes....

long story short. he never looked at the flywheel until he went to replace the starter and saw the ring gear came off the flywheel. so they called me twos later saying they are ordering the flywheel.

i told the service manager....i told you it was the flywheel when I dropped it off.

absolutely...post up a log. ill be happy to take a look. upload it to datazap and post the link here. or email whatever is easiest for you.

Sent from my HTC One_M8 using Tapatalk



I had this experience except with a dirty MAF sensor. The idiot kept clearing the codes and doing nothing to fix it. Then blamed the tune... Last time I trusted that dealership.
 

TwistedTuning

Ready to race!
I had this experience except with a dirty MAF sensor. The idiot kept clearing the codes and doing nothing to fix it. Then blamed the tune... Last time I trusted that dealership.
yea it's quite sad actually. a buddy of mine dropped his brand new Z06 off to the dealer for warranty work. so when he got it back. i looked it over for him because neither of us trust dealers. there were clips missing, loose bolts and etc. like really!!!!!

Sent from my HTC One_M8 using Tapatalk
 

jettaglx91

Go Kart Champion
Taking it in tomorrow morning to get the PCV valve replaced and new sealant for the valve cover. The shop foreman agreed that he thought it may be the culprit as well.

Thanks! This is exactly what I told them the first time but these certified techs couldn't figure it out lol.


Sent from my iPhone using Tapatalk

Keep in mind that the tsi doesnt have a traditional valve cover. Its all in one with the cam cover which is the bearing/journal caps. To take that off properly is a pretty big job.
 

littleazn248

Go Kart Champion
Pcv fixed but they said the valve cover leak is not major enough to fix. Actually this fix alone makes the car feel much better...or maybe its a placebo effect?
 
Last edited:

littleazn248

Go Kart Champion
Here are some datalogs performed per TwistedTuning's instructions:

1. 2nd gear at 2000rpm to 5500rpm
https://drive.google.com/open?id=0B5Jz2nvDFoR3RzFtQUNxaWVnRDg

2. 3rd gear pull from 2800rpm to redline
https://drive.google.com/open?id=0B5Jz2nvDFoR3ZGZ0cW10VUJwZUE

3. 4th gear pull from 2800rpm to redline
https://drive.google.com/open?id=0B5Jz2nvDFoR3ZkJqdVZfWC1vUnM

4. 3rd gear to 4th gear wot
https://drive.google.com/open?id=0B5Jz2nvDFoR3SFk1dXRac2JUcDQ

5. Normal Cruising for 30 seconds (one cruising at 40 and another at 60). Whats the deal with the whack AFR of 250ish?
https://drive.google.com/open?id=0B5Jz2nvDFoR3a3dlWnFrSndITlk
https://drive.google.com/open?id=0B5Jz2nvDFoR3WTlvVE02RlVGcE0
 
Last edited:

lilonespaz

Drag Race Newbie
hmm so it seems like without digging any further by me that COBB OTS tunes consistently pull -3 timing. your logs are like the 6th person logs ive seen where its pulling -3 degrees.
 

OhioMK6

Ready to race!
hmm so it seems like without digging any further by me that COBB OTS tunes consistently pull -3 timing. your logs are like the 6th person logs ive seen where its pulling -3 degrees.

I haven't done any proper logs, but I usually get a -3 pop up under "Knock Ret." Is this bad? Could it just be gas quality causing knock? It happens randomly. For example, I drove 50 miles today without any timing retarding happening.

Also, how do I know if my fuel trims are okay? I have LTFT and STFT displayed. Can anyone give me cliff notes on each of those readings and what they mean. When the reading is over 1 means I'm running lean, and <1 is rich? My LTFT stays around 1.03 or so and my STFT is usually around there as well, but can jump up to 1.10 sometimes.
 

littleazn248

Go Kart Champion
hmm so it seems like without digging any further by me that COBB OTS tunes consistently pull -3 timing. your logs are like the 6th person logs ive seen where its pulling -3 degrees.

Yeah I am certainly not very impressed. I don't know how much additional it will cost to tune out these knocking issues.
 

BroMoney

Passed Driver's Ed
I do not have the AP yet, it's just something I'm researching right now. My understanding at this point is as follows:

The current tuners with Stage 2 files (possibly with the exception of GIAC) have OTS maps that will stop the CEL from showing, but do not set readiness, so the car will not pass.

I plan on running a catted downpipe at some point down the road, but I'd prefer to avoid issues with passing inspection due to this in the future if possible. Without swapping out the downpipe for the stock one, I am trying to figure out if the Cobb OTS file deletes the CEL only, or allows for readiness to be set as well.

I did message the guys over at Cobb, and got this response:

"Our Stage 2 calibrations should not have any issues with codes related to the O2 sensor so you would be good to go for inspection.

Marshall@COBB"


This seems to suggest that Cobb has figured out a way to enable readiness with their Stage 2 file. Is there anyone out there who has had their inspection done or tried to set readiness with Vagcom? This could be a major selling point for the Cobb AP, as you could run any downpipe without the fear of inspection day.

Does the AP back up my original VW tune when I installed my initial tune? Is there a way I can save this to my computer for safe keeping? The focus ST guys are saying that the AP doesn't actually back up the oem tune. I find this kind of concerning.

As someone who is looking into and researching COBB for my first tune, these are two huge open and unanswered questions that could sway potential buyers. Anyone have more specific answers to these questions?

The first is huge coming from NY and the second one would be great towards providing security to avoid a TD1 flag.
 

TwistedTuning

Ready to race!
Here are some datalogs performed per TwistedTuning's instructions:

1. 2nd gear at 2000rpm to 5500rpm
https://drive.google.com/open?id=0B5Jz2nvDFoR3RzFtQUNxaWVnRDg

2. 3rd gear pull from 2800rpm to redline
https://drive.google.com/open?id=0B5Jz2nvDFoR3ZGZ0cW10VUJwZUE

3. 4th gear pull from 2800rpm to redline
https://drive.google.com/open?id=0B5Jz2nvDFoR3ZkJqdVZfWC1vUnM

4. 3rd gear to 4th gear wot
https://drive.google.com/open?id=0B5Jz2nvDFoR3SFk1dXRac2JUcDQ

5. Normal Cruising for 30 seconds (one cruising at 40 and another at 60). Whats the deal with the whack AFR of 250ish?
https://drive.google.com/open?id=0B5Jz2nvDFoR3a3dlWnFrSndITlk
https://drive.google.com/open?id=0B5Jz2nvDFoR3WTlvVE02RlVGcE0
ill take a look shortly. but to answer your question quickly about the AFR seeing 250.

deceleration enleanment, pretty much shuts off injectors. also a good way to tell if you have a leaky injector.

Sent from my HTC One_M8 using Tapatalk
 

TwistedTuning

Ready to race!
Here are some datalogs performed per TwistedTuning's instructions:


ok, checked those logs out. and you probably already know this, but of curse there is a good amount of room for improvement. Although your trims aren't super off like some I've seen. they could still be dialed it a bit better, but nothing substantial there. Its to be expected by having a different intake than what that tune was calibrated for.

And yes, as I stated earlier about your AFR dropping to 234afr, that's completely normal. and happens on deceleration enleanment.

The timing corrections..... a little much for my liking. on the WOT pulls, I feel the fueling could be richened up slightly during spool and in the beginning of the midrange.

Long story short, it could use some tweaking, but I would like to also know if those timing corrections happen all the time or are they more sporadic?


hmm so it seems like without digging any further by me that COBB OTS tunes consistently pull -3 timing. your logs are like the 6th person logs ive seen where its pulling -3 degrees.

I haven't done any proper logs, but I usually get a -3 pop up under "Knock Ret." Is this bad? Could it just be gas quality causing knock? It happens randomly. For example, I drove 50 miles today without any timing retarding happening.

Also, how do I know if my fuel trims are okay? I have LTFT and STFT displayed. Can anyone give me cliff notes on each of those readings and what they mean. When the reading is over 1 means I'm running lean, and <1 is rich? My LTFT stays around 1.03 or so and my STFT is usually around there as well, but can jump up to 1.10 sometimes.


yes you are correct in your understanding of how the fuel trims read. 1.08 means the ECu is adding 8% fuel in that area. 0.88 means the ECU is taking away 12% fuel in that area for example. A value of 1 in the trims means the car is happy and for the most part that part of the calibration (tune) is on point.


Yeah I am certainly not very impressed. I don't know how much additional it will cost to tune out these knocking issues.

As someone who is looking into and researching COBB for my first tune, these are two huge open and unanswered questions that could sway potential buyers. Anyone have more specific answers to these questions?

The first is huge coming from NY and the second one would be great towards providing security to avoid a TD1 flag.



just be aware, that these car have similar timing corrections in stock unturned form. so with that ever timing correction you see, is not necessarily a bad/engine damaging correction event. Some of it can simply be engine noise. Knock corrections you want to pay attention to and be concerned about are those that:

1. show consistency in where and how they happen (same boost, throttle, rpm, and etc)

2. corrections that happen across multiple cylinders at the same time (generally more than -3)

3. spikes of over -3. so if you see something like -4 or -5 or something high like that. its something you may want to look into.

timing corrections can be a result of actual knock/detonation, IAT correction by the ECU, coolant temp correction, and also LEARNED correction factors. Yes, these cars learn to an extent for continuous knocking events. Just keep monitoring your car, if you see something alarming or just have a question. Post up a log, or don't hesitate to drop me a PM or email. if its something your very concerned about, I'd be happy to work something out you all. I'm here to help.

Try to also start getting into the habit of using Datazap to upload and share logs. Nice app, that helps you visualize the log better and easy sharing.

@littleazn248 I uploaded one of yours so you can see, haha.

http://datazap.me/u/twistedtuning/3rd-gear-pull?log=0&data=1-3-6-7-11-12-13-14-19
 

Stage2Sasquatch

Go Kart Champion
Try to also start getting into the habit of using Datazap to upload and share logs. Nice app, that helps you visualize the log better and easy sharing.

Yep. This is what I tell all users on the MK7 forums to start doing. It's a simple, easy way to share data and a MUCH easier way to look through the data.
 

MK6BRO

Passed Driver's Ed
So what numbers are people putting down with this tune? Last time I checked they were quite a bit lower than APR's, just wondering if any additional updates have been made.

Hope someone can fill me in, there's a lot to read the past couple pages.
 
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