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DG_ 06-17-2013 09:33 PM

Tuners Help
 
3 Attachment(s)
Just did a datalog on my car and it shows the ecu is pulling A LOT of knock; see attachments.

Could this be just bad gas (always fill up 93 at exxon or shell) or could something else be causing this problem.
I'm currently running o/r x pipe.

Ditty 06-17-2013 11:44 PM

Are you running a tune on the car? If so, I would data log a lot and then send them to your tuner.

DG_ 06-18-2013 07:58 AM

Stock tune at the moment.

scottmach 06-18-2013 04:29 PM

Why the heck are you running an off road x-pipe and no tune?

Ditty 06-18-2013 05:01 PM

THIS is the source of your problem. It's required to run a tune if you delete the cats.

DG_ 06-18-2013 08:14 PM

Quote:

Originally Posted by scottmach (Post 8233555)
Why the heck are you running an off road x-pipe and no tune?

Quote:

Originally Posted by Ditty (Post 8233575)
THIS is the source of your problem. It's required to run a tune if you delete the cats.

TBH I thought the same thing, but the tuners at BAMA assured me it's ok to drive without a tune. Basically saying that it'll run just a bit richer and the cat cells would come on.

That was a month or so ago. I now was planning on getting a tune from another tuner, but once I showed him the datalog, he said that either I'm running bad gas or there might be another issue going on and that he can't tune it while this is going on.

I figured I would post here, seeing if anyone else has any insight of what might be causing this issue.

Ditty 06-18-2013 08:43 PM

W/ out the cats, the car thinks that there is something wrong. You HAVE to have a tune to turn the down stream O2 sensors off if you are running cat-less. I doubt someone at Bama or AM told you that you can run w/out cats and w/out a tune. (not saying you're lying) Bama offers a catless tune for this reason. I'm surprised you don't have a CEL running cat-less.

Slowbra302 06-19-2013 09:48 PM

I would like a little more elaboration on this. I am running the smoothest performance tune right now I have ever driven. This thing drives smoother than the other two 5.0s I have driven, one tuned and one stock. The only thing is that bama forgot to turn off the rear O2 sensors so occasional it will throw a code every couple days and I jus clear it. Now I am emailing them as I type this to have it turned off, but HOW can just a couple of sensors inhibit anything with the motor. Now if they were the wideband front one, I could see that, but not the rears???

Thanks as always!

Ditty 06-19-2013 11:04 PM

All four of the O2s are wideband. I had a failed O2 on my DS downstream and it would cough and sputter until I replaced it.

With both upstream and downstream O2's on and NO cats, they are reading the exact same thing, so the ECU thinks that the Cats are bad and tosses the CEL and puts the car into a sort of 'limp mode'. The up and down stream O2's are not supposed to read the same thing, if they did (on an unmodified car) it would mean that the cats have failed.

Slowbra302 06-24-2013 09:09 PM

Quote:

Originally Posted by Ditty (Post 8234521)
All four of the O2s are wideband. I had a failed O2 on my DS downstream and it would cough and sputter until I replaced it.

With both upstream and downstream O2's on and NO cats, they are reading the exact same thing, so the ECU thinks that the Cats are bad and tosses the CEL and puts the car into a sort of 'limp mode'. The up and down stream O2's are not supposed to read the same thing, if they did (on an unmodified car) it would mean that the cats have failed.

Mine still rips super hard after it throws the codes lol.... Nothing changes lol. Maybe bugged?.

Deranged2013 07-06-2013 06:37 AM

OP. Did you ever get your issues sorted out? Guess you found out the hard way that you need a tune to run an off road pipe. There have been issues of bad pump gas going around also.

Slowbra302 07-06-2013 11:55 PM

Quote:

Originally Posted by Deranged2013 (Post 8243372)
OP. Did you ever get your issues sorted out? Guess you found out the hard way that you need a tune to run an off road pipe. There have been issues of bad pump gas going around also.

Why is it you must have a specific tune to run an O/R midpipe. I am not challenging your statement saying one DOESN'T need one. I am stating you won't see the appropriate gains. It shouldn't hurt to run without a tune but that Is how I feel and probably am wrong, just want the science to back it up please.

Don't mean to be disrepsectful if I was, really appreciate any insight you can give me!!!

Slowbra302 07-06-2013 11:56 PM

Oh and yes, OP any update?!

Deranged2013 07-07-2013 06:51 AM

Quote:

Originally Posted by Slowbra302 (Post 8243799)
Why is it you must have a specific tune to run an O/R midpipe. I am not challenging your statement saying one DOESN'T need one. I am stating you won't see the appropriate gains. It shouldn't hurt to run without a tune but that Is how I feel and probably am wrong, just want the science to back it up please.

Don't mean to be disrepsectful if I was, really appreciate any insight you can give me!!!

I'm sure you will see gains and the car will run, with a CEL on of course and ****ty surging idle. I would worry about running to rich and even more worried about running lean, which is the reason for the blown #8 issues. With a tune you can shut off the rear O2 sensors and stabilize the proper A/F ratios and fuel trims. Point is, If you are going to mod your car, make sure it is tuned properly for the mod installed.

scottmach 07-07-2013 06:58 AM

Quote:

Originally Posted by Slowbra302 (Post 8243799)
Why is it you must have a specific tune to run an O/R midpipe. I am not challenging your statement saying one DOESN'T need one. I am stating you won't see the appropriate gains. It shouldn't hurt to run without a tune but that Is how I feel and probably am wrong, just want the science to back it up please.

Don't mean to be disrepsectful if I was, really appreciate any insight you can give me!!!

Because 2011+ cars have a new feature called Cat Overtemp Protection that must be addressed with a tune or the car will continue to dump fuel to cool the cats which are no longer present.

Slowbra302 07-10-2013 09:45 AM

Ahhhhhh okay. It all makes sense! I appreciate all the feedback! Now just to see what is going on with OP.


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