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Could This Be True??

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Old Oct 15, 2007 | 10:28 PM
  #1  
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Default Could This Be True??

I made a post on HP Tuners website about the TM issue for A6 cars from a dead stop launch and someone replied back to me with his answer for the solution. Here is what i wrote:

Any updates yet? It sure would be nice if someone from HPT would give some input on this. The latest software removes TM for the downshifts and during the shifts which is very noticeable but nothing has been done for removing TM from a idle standing dead stop launch. We need a fix for this very soon!

Here is his reply:

It's not TM.

Its airflow directly removing timing from the in rush of the near instant transition from high manifold vacumn to near atmospheric,that volume of air is rapidly sucked in and causing the timing tables to react with negative timing killing power.
As i posted in another post here,simply zero out all the negative values(or even go positive)in the timing tables. This is the range of cells in the lower left quadrant of the high and low octane timing maps.Try it you will be pleasantly surprised.

Here is another reply:

The reason is the inrush of air into the intake volume under vacumn at idle causes a transient high airflow condition through the MAF sensor,and it sends the airflow transient to the PCM,which sends ignition timing negative and kills all engine power.
Just try it for yourself...I don't need to document it because it works.


So what do you guys think of this guys theory that it is not TM and it can be changed in the high and low timing maps by changing all the negative values to zero or positive. Maybe someone that has HP at home and can try this to see if it really works would be great!
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Old Oct 15, 2007 | 11:42 PM
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From: Down on the bayou La.
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Originally Posted by High Roller1
I made a post on HP Tuners website about the TM issue for A6 cars from a dead stop launch and someone replied back to me with his answer for the solution. Here is what i wrote:

Any updates yet? It sure would be nice if someone from HPT would give some input on this. The latest software removes TM for the downshifts and during the shifts which is very noticeable but nothing has been done for removing TM from a idle standing dead stop launch. We need a fix for this very soon!

Here is his reply:

It's not TM.

Its airflow directly removing timing from the in rush of the near instant transition from high manifold vacumn to near atmospheric,that volume of air is rapidly sucked in and causing the timing tables to react with negative timing killing power.
As i posted in another post here,simply zero out all the negative values(or even go positive)in the timing tables. This is the range of cells in the lower left quadrant of the high and low octane timing maps.Try it you will be pleasantly surprised.

Here is another reply:

The reason is the inrush of air into the intake volume under vacumn at idle causes a transient high airflow condition through the MAF sensor,and it sends the airflow transient to the PCM,which sends ignition timing negative and kills all engine power.
Just try it for yourself...I don't need to document it because it works.


So what do you guys think of this guys theory that it is not TM and it can be changed in the high and low timing maps by changing all the negative values to zero or positive. Maybe someone that has HP at home and can try this to see if it really works would be great!
I am member "9secZ06" @ HP....did not see your post. Look at the box in the menu for tm that reads "Launch Control". Thats the bitch, go handle up
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Old Oct 15, 2007 | 11:46 PM
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I read that same thread.

J HEBERT, what about TM on the Z06? I have a Z06 thread going over there did you see it?
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Old Oct 16, 2007 | 10:01 AM
  #4  
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From: Down on the bayou La.
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On hptuners, in the editor, click engine, click fuel cutoff, then lower left u will see accell based......click accel thresh, when the "PRM Limit Accel Thresh vs. Accel". In the very right -hand side of the box under 1000 u will see the value "500", MAKE IT "0". They will not ask u why "u got out of it at the line" again.......MR Z put me hip to this when he visited me on the dyno and I was bitchin' about it.
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Old Oct 16, 2007 | 10:16 PM
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Shweet, thanks from me also, been looking for that fix.
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Old Oct 17, 2007 | 07:39 PM
  #6  
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From: Down on the bayou La.
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HR, did our solution work for u? If u do feel u need to 0 out the negative #s, that's fine, but do not go positive as bba suggested. There will be spots it will detonate, Bill posted on this as well. I gotta know if this helps the auto guys. The TBSS/stall guys look screwed for now.....
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Old Oct 17, 2007 | 08:25 PM
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From: Pinellas Park Fl
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In a nut shell, when cracking open the throttle in a rapid motion there is a momentary lean condition.

If everything else is good try zeroing out the retard and go from there as a starting point.
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