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 Post subject: Ignition Dwell
PostPosted: Sun Apr 29, 2012 1:23 pm 
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Joined: Tue Aug 18, 2009 7:11 pm
Posts: 45
Hi,

I'm having some trouble entering the correct dwell values into the 3.6.5 Carberry ROM on my 2001 EDM Bugeye WRX (A4SE900D). I've taken the dwell value from my MAF ROM:

Code:
[Selection3D]
4.88   4.88   4.88   4.88   4.88   4.88   4.62   4.06   3.56   3.25   2.94   2.69   2.50   2.31   2.19   2.00
4.38   4.38   4.38   4.38   4.38   4.31   3.94   3.62   3.44   3.25   2.94   2.69   2.50   2.31   2.19   2.00
3.88   3.88   3.88   3.88   3.62   3.25   3.00   2.81   2.69   2.56   2.44   2.38   2.25   2.12   2.06   1.94
2.94   2.94   2.94   2.94   2.94   2.69   2.44   2.31   2.19   2.12   2.00   1.94   1.88   1.81   1.75   1.69
1.94   1.94   1.94   1.94   1.94   1.94   1.94   1.94   1.88   1.81   1.69   1.62   1.56   1.50   1.50   1.44


but when I paste them into the Carberry ROM i get different values:

Code:
[Selection3D]
4.86   4.86   4.86   4.86   4.86   4.86   4.61   4.03   3.58   3.26   2.94   2.69   2.50   2.30   2.18   1.98
4.35   4.35   4.35   4.35   4.35   4.29   3.97   3.65   3.46   3.26   2.94   2.69   2.50   2.30   2.18   1.98
3.90   3.90   3.90   3.90   3.65   3.26   3.01   2.82   2.69   2.56   2.43   2.37   2.24   2.11   2.05   1.92
2.94   2.94   2.94   2.94   2.94   2.69   2.43   2.30   2.18   2.11   1.98   1.92   1.86   1.79   1.73   1.66
1.92   1.92   1.92   1.92   1.92   1.92   1.92   1.92   1.86   1.79   1.66   1.60   1.54   1.47   1.47   1.47


I've noticed that the conversion formula on the Carberry ROM for dwell is x*0.064 and my ROM's conversion is x*0.0625 so I tried the conversion in Excel and got this??:

Code:
5.00   5.00   5.00   5.00   5.00   5.00   4.73   4.16   3.65   3.33   3.01   2.75   2.56   2.37   2.24   2.05
4.49   4.49   4.49   4.49   4.49   4.41   4.03   3.71   3.52   3.33   3.01   2.75   2.56   2.37   2.24   2.05
3.97   3.97   3.97   3.97   3.71   3.33   3.07   2.88   2.75   2.62   2.50   2.44   2.30   2.17   2.11   1.99
3.01   3.01   3.01   3.01   3.01   2.75   2.50   2.37   2.24   2.17   2.05   1.99   1.93   1.85   1.79   1.73
1.99   1.99   1.99   1.99   1.99   1.99   1.99   1.99   1.93   1.85   1.73   1.66   1.60   1.54   1.54   1.47


Which are the values to use?

Thanks very much

Ben


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 Post subject: Re: Ignition Dwell
PostPosted: Sun Apr 29, 2012 5:00 pm 
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Joined: Tue Sep 28, 2010 12:20 am
Posts: 135
Its only a few fractions of a milisecond difference, I would not worry about it.

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 Post subject: Re: Ignition Dwell
PostPosted: Sun Apr 29, 2012 5:01 pm 
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Joined: Thu Aug 03, 2006 2:40 pm
Posts: 1934
i wouldn't worry about an error on the scale of tens of microseconds.

:)


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 Post subject: Re: Ignition Dwell
PostPosted: Sun Apr 29, 2012 5:05 pm 
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Joined: Tue Aug 30, 2011 7:17 pm
Posts: 900
Being .02 off is no big deal, but the values are so close that they probably represent the same hex value in the ROM. Change the conversion factor in your MAF defs to x*0.064 and then compare the values, I imagine they will be the same.


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 Post subject: Re: Ignition Dwell
PostPosted: Sun Apr 29, 2012 10:13 pm 
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Joined: Sun Aug 07, 2011 3:15 am
Posts: 452
Location: Jamaica
that is what i did for mine, i opened up the dwell time in my stock map using carberry conversion factor and copied the values over.


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 Post subject: Re: Ignition Dwell
PostPosted: Mon Apr 30, 2012 5:07 am 
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Joined: Wed Feb 06, 2008 6:08 pm
Posts: 395
Location: Colorado
Anybody played around with these and seen any interesting results??

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 Post subject: Re: Ignition Dwell
PostPosted: Mon Apr 30, 2012 9:43 am 
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Joined: Thu Aug 03, 2006 2:40 pm
Posts: 1934
GeneralTJI wrote:
Anybody played around with these and seen any interesting results??


if by "interesting results" you mean blown/melted coil packs, i say "just wait a little while."

;)


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 Post subject: Re: Ignition Dwell
PostPosted: Mon Apr 30, 2012 3:37 pm 
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Joined: Tue Aug 18, 2009 7:11 pm
Posts: 45
Carbibbles wrote:
Being .02 off is no big deal, but the values are so close that they probably represent the same hex value in the ROM. Change the conversion factor in your MAF defs to x*0.064 and then compare the values, I imagine they will be the same.


Excellent thanks Carbibbles and good luck with your exams this week!

Ben


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 Post subject: Re: Ignition Dwell
PostPosted: Tue May 01, 2012 7:23 pm 
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Joined: Wed Feb 06, 2008 6:08 pm
Posts: 395
Location: Colorado
Quote:
if by "interesting results" you mean blown/melted coil packs, i say "just wait a little while."


I'm running the values that came from my stock map...

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 Post subject: Re: Ignition Dwell
PostPosted: Wed May 02, 2012 12:00 am 
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Joined: Sun Aug 07, 2011 3:15 am
Posts: 452
Location: Jamaica
I had been running the carberry values on mine from last year, i just changed them last week to stock.


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