Cobb AccessPORT + AccessTUNER race vs Open Source

**SubaruWRC** · 01-21-2013 08:28 PM

I know there are a bunch of posts about the cobb AP vs Open Source, but from what I have found it seems like the information is outdated? I have seen that Cobb can't do data logging (which I believe it can now?) and you need a tuner to tune it for you.

From what I can gather with the AccessTUNER software this gives you essentially open source capability with cobb support? Is this true? Also how hard is it to learn AccessTUNER?

**EJ257** · 01-21-2013 08:44 PM

Cobb AP vs OpenECU (Tactrix/Romraider/ECUFlash)

In order to start tuning, you need to have an understanding of both EFI systems and how an internal combustion engine works. It's not difficult, per se, but it isn't something you'll learn overnight.

**SubaruWRC** · 01-21-2013 09:21 PM

So the fast polling that from raider can do. Is this a big deal? That is the only thing other than the price that open source does better than the Cobb ap right?

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**EJ257** · 01-21-2013 09:26 PM

Originally Posted by SubaruWRC

So the fast polling that from raider can do. Is this a big deal? That is the only thing other than the price that open source does better than the Cobb ap right?

Resolution is important; it allows you to get a better picture of what's going on. There are also a bunch of tools/utilities that also help with map-creation / log analyzing, but I know Cobb offers some (I'm just not familiar enough with them to comment on how extensive/useful they are).

**SubaruWRC** · 01-22-2013 07:07 AM

Does anyone have experience with both open source and accesstuner?

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**Axex** · 01-22-2013 08:29 AM

I think a big advantage for the COBB system (and why most tuners use it) is the real time/live tuning option. For most people doing their own cars the open source method of flash, log, adjust, and repeat is fine, but if I was doing it all the time for a business or something, I would want it real time. Especially on a dyno where time is money!

Opensource has a good community behind it and a lot of people that calibrate the engines themselves. The AP can be used for this too, it just costs more.

**SubaruWRC** · 01-22-2013 08:32 AM

Would it be harder to try to tune my car from a stage 1 ots map or to tune it from scratch using open source?

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**EJ257** · 01-22-2013 08:34 AM

Originally Posted by SubaruWRC

Does anyone have experience with both open source and accesstuner?

I've modified maps with ATR on other peoples computers (I'm unable to install ATR on my computer because I don't have an AP).

**Axex** · 01-22-2013 08:39 AM

Originally Posted by SubaruWRC

Would it be harder to try to tune my car from a stage 1 ots map or to tune it from scratch using open source?

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Tuning with a base map should be easier or at least quicker. You can get base maps from people in the opensource community too though, you just gotta find a trustworthy one.

**SubaruWRC** · 01-22-2013 09:13 AM

So someone with open source tuning experience could help me with my ap?

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**EJ257** · 01-22-2013 10:28 AM

Originally Posted by SubaruWRC

So someone with open source tuning experience could help me with my ap?

Yes. It may take a little bit longer because some tables may be named differently or setup with different measurement units, but the concepts are the same. Someone familiar with Cobb should be able to give you an OpenECU tune, and vice versa.

The lead designer of OpenECU is now employed by Cobb, for what it's worth.

**SubaruWRC** · 01-22-2013 06:48 PM

Okay So I Flashed Stage 1.... Its amazing how quickly the turbo spools, I can feel it start to kick in at 2500 RPM. Its really pretty amazing now I want to get to modifying this map, but I don't know how to do that. I attached the files to for everyone to examine to see if it looks correct? Also if it checks out where could I start looking to make improvements?

**EJ257** · 01-23-2013 03:42 AM

Originally Posted by SubaruWRC

Okay So I Flashed Stage 1.... Its amazing how quickly the turbo spools, I can feel it start to kick in at 2500 RPM. Its really pretty amazing now I want to get to modifying this map, but I don't know how to do that. I attached the files to for everyone to examine to see if it looks correct? Also if it checks out where could I start looking to make improvements?

You've got some FBKC in the first log when you stabbed the throttle; this sometimes happens, and didn't happen in the second log, so I wouldn't worry about it too much just yet. Both logs show some FLKC in them.

Remove AF Learning, Dynamic Adv (keep DAM), and the two MAF columns, so we'll have a bit better resolution. If you can upload the logs as CSV files (native file extension) to Google Docs, it makes it a little easier to read/manipulate a bit. Just make sure to make them public, so we can read them.

**SubaruWRC** · 01-23-2013 09:45 AM

FBKC is feedback knock? And what does this mean? And what is FLKC? Fine Knock Learning? What does this mean? And what do you mean better resolution? just on the actual document so it is easier to see? Also is the boost supposed to spike like that? it hits 14.9 and I think the boost target is 14.7 which i think is okay because I'm sure it's not that accurate but it drops to 12.5 right after? Is this supposed to happen? Also does it make sense that the wastegate duty only hits 50%?