996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Timing, RPM, Throttle Position

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Old Aug 12, 2006 | 01:42 PM
  #16  
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Originally Posted by 1999Porsche911
Lke I said earlier.....run a graph of timing and rpm at WOT going from a 2nd gear high rpm shift into 3rd gear. Let's see what the timing does then.
The chart I created was a compilation of several runs in both 2nd and 3rd gear. I filtered all the data to only show:

1 - WOT
2 - LOAD > 38%

I then manually filtered out a few data points that were obviously not part of the pattern.

My primary objective is to explore 2nd gear. 3rd seems fine (as you are eluding to). My data shows a combination of pulls in both 2nd and 3rd. Thus, making the data shown a conservative representation of my situation and perhaps understates my primary area of interest: Exploring the phenomenon of NO WHEEL SPIN IN 2nd gear.
 
Old Aug 12, 2006 | 02:13 PM
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Originally Posted by Zippy
The chart I created was a compilation of several runs in both 2nd and 3rd gear. I filtered all the data to only show:

1 - WOT
2 - LOAD > 38%

I then manually filtered out a few data points that were obviously not part of the pattern.

My primary objective is to explore 2nd gear. 3rd seems fine (as you are eluding to). My data shows a combination of pulls in both 2nd and 3rd. Thus, making the data shown a conservative representation of my situation and perhaps understates my primary area of interest: Exploring the phenomenon of NO WHEEL SPIN IN 2nd gear.

The point I am attempting to make is that this may very well be the pullback in timing of the variocam. If that is the case, then it will occur in all gears where WOT occurs from low RPM. To verify this, you need to kick the variocam to it engaement point and shift to the next gear, and continue WOT so not to have the cam drop it's lift. If the timing is higher after the shifts for the same RPM points, this would point to variocam timing pullback.
 

Last edited by 1999Porsche911; Aug 12, 2006 at 02:41 PM.
Old Aug 12, 2006 | 06:04 PM
  #18  
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Thanks 1999Porsche911. I'll post a 2nd gear pull including a shift into 3rd (to redline) later this weekend.

Mike
 
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