[FastBimmerN54]

Without a war, I'm curious how the PWM meth kit would help? It seems to me an issue that needs to be tuned out more then anything?

[themyst]

So can anyone offer insight on what cells I should be changing based on the log I posted? I'm having the timing issue on the 2-3 shift, not the 3-4. Having good timing on the 2-3 shift would be a nice starting point.

I just posted a log that shows the problem ON meth so this issue isn't IAT related.

[Glowin]

Originally Posted by FastBimmerN54

Without a war, I'm curious how the PWM meth kit would help? It seems to me an issue that needs to be tuned out more then anything?

+ 1. Shiv, you said earlier his issue is a "transmission adaptation" issue. Can you pls. elaborate a bit on that, and how a PWM meth kit would solve it? I'm trying to figure out how the transmission is involved here...

[themyst]

PWM meth kit or PPS, on 6ATs under WOT, the meth spray is constant throughout the run since there is no lift during the shift; I seriously doubt a PWM meth kit will make any difference under WOT for this issue. OK, for arguments sake lets say the PWM meth kit makes drivability much smoother under part throttle or whatever, fine and it injects methanol .01 seconds faster than a conventional kit, fair enough, the challenge is post-shift timing where meth is at full flow already.

The challenge is stabilizing fuel trims to ensure the DME doesn't have fuel spikes post-shift, which are causing this issue. I am also wondering if the DME is adding fuel over time and adaptation, causing the problem to come back.

Oh well. At least I know this affects both piggybacks now

[Ilma]

Originally Posted by Glowin

+ 1. Shiv, you said earlier his issue is a "transmission adaptation" issue. Can you pls. elaborate a bit on that, and how a PWM meth kit would solve it? I'm trying to figure out how the transmission is involved here...

I don't recall him saying that about me in particular. Might have been someone else with a similar issue though.

I did state at one point that the problem seemed to disappear after a transmission reset for a short while.

But in all truth, I have been on a wild goose chase trying to correlate this issue to something.

Seems more likely to be an intermittent problem that comes and goes, or resolves temporarily under certain conditions....only to rear it's ugly head again just when you think you have licked it.

[Ilma]

Originally Posted by themyst

The challenge is stabilizing fuel trims to ensure the DME doesn't have fuel spikes post-shift, which are causing this issue. I am also wondering if the DME is adding fuel over time and adaptation, causing the problem to come back.

Oh well. At least I know this affects both piggybacks now

I was just looking over some logs going back to January before the problem started up.

There is always the same pattern to the AF ratio at the shift....goes lean then richens a bit before it stabilizes.

They look pretty much the same as they do now. So I don't think that is the root of my particular problem. It did appear to help and the map shiv tailored for me did lean out the rich spike consistently.

Just doesn't look like the AF ratio is the real problem here.

[themyst]

Originally Posted by Ilma

I was just looking over some logs going back to January before the problem started up.

There is always the same pattern to the AF ratio at the shift....goes lean then richens a bit before it stabilizes.

They look pretty much the same as they do now. So I don't think that is the root of my particular problem. It did appear to help and the map shiv tailored for me did lean out the rich spike consistently.

Just doesn't look like the AF ratio is the real problem here.

Yeah, what changed is you got new DME software. I had no problems before the recall as well.

[Ilma]

Originally Posted by themyst

Yeah, what changed is you got new DME software. I had no problems before the recall as well.

Sure, I agree with that.

But then why aren't a lot of other people with the newer DME update reporting this issue too?

[themyst]

Originally Posted by Ilma

Sure, I agree with that.

But then why aren't a lot of other people with the newer DME update reporting this issue too?

Oh they are. Look at the JB4 camp, plenty of us with the post-recall DME software have the problem.

Bet if the Procede guys with the recall software and 6AT logged, they'd see the same thing. Problem is no one really cares as long as the car runs well

[Ilma]

Originally Posted by themyst

Oh they are. Look at the JB4 camp, plenty of us with the post-recall DME software have the problem.

Bet if the Procede guys with the recall software and 6AT logged, they'd see the same thing. Problem is no one really cares as long as the car runs well

Oh....didn't know that.

Been out of the JB loop for over a year now.

Yeah, I wish a few more of you 6AT guys with newer DME software would post up some logs so we can see if that is the common enemy.

You are quite right about not knowing about the problem unless you log. My car still rips.

[themyst]

http://www.n54tech.com/forums/showthread.php?t=13195

Here is our discussion in the JB camp. Same issue for a good number of us. Sometimes it happens, sometimes it doesn't, who knows. It's irritating to say the least.

-edit - mods I am not sure if linking to n54tech is legal. Apologies if it is not.

[Ilma]

Originally Posted by themyst

http://www.n54tech.com/forums/showthread.php?t=13195

Here is our discussion in the JB camp. Same issue for a good number of us. Sometimes it happens, sometimes it doesn't, who knows. It's irritating to say the least.

-edit - mods I am not sure if linking to n54tech is legal. Apologies if it is not.

Lol....I was just there reading the post.

Didn't realize how common of an issue this is.

Here I thought it was just me

[themyst]

I ran the map Shiv sent Ilma that "sort of" fixed it and no dice. Timing still does not recover post-shift. This is a 3-4 shift.

[themyst]

What confuses me after further analysis is that the DME is adding fuel post-shift even with the fuel corrections implemented in the Procede. Would you have to change AFR target offset to prevent the DME from doing this? Obviously octane isn't the issue since it is sustaining timing properly in 3rd gear before the shift. Shiv, input?

[Tzu]

Have you got the go-to "the 6-14 maps are fine. It must be your car" answer yet?

[Jeff@TopGearSolutions]

Can you log just 4th out of curiosity

[themyst]

Nope. Thing is, this happens on both the JB4 and Procede so it has to be DME related.

[themyst]

Originally Posted by Jeff@topgearsolutions

Can you log just 4th out of curiosity

Not tonight, but from personal experience, if you start the run in 4th gear, timing is fine. There is something going on during the shift or immediately post-shift that is causing this issue on 6ATs; it's possible this issue can't be resolved on 6ATs.

[Tzu]

Originally Posted by themyst

Nope. Thing is, this happens on both the JB4 and Procede so it has to be DME related.

What DME version do you have?

[themyst]

Originally Posted by Tzu

What DME version do you have?

Have no idea, but it's fairly recent. They updated my DME during the HPFP recall campaign and it started doing that. Perhaps the DME is more sensitive to fuel swings than it was before.

[Tzu]

I also got the new hpfp and new software. My logs are fine so far. It would be interesting to see a sole 4th gear log from a low shift point, rather than 3-4.

[dzenno]

What I "think" is the issue here is the the dme is coded with a certain AFR curve vs. load...DME targets leaner AFR everytime but piggys bias the front wideband signals so it runs richer...this creates conflict post shift between what the dme is quickly trying to target AFR wise and what piggys are biasing towards...this is also why there's a lean than a rich spike as well...I could bet if you flashed your AFR to a richer curve in the dme, say setting it to 12, you'd probably not have that situation...what you have there with zeroed out ignition, in my opinion, is knock...lower boost to 8 psi and log it...I can bet you won't see that drop post shift as stock boost vs stock AFR is fine for that timing...I'd love to see this log off your cars Ilma and themyst...