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how to scale timing table(s)?

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Old Jan 6, 2015 | 05:10 PM
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Default how to scale timing table(s)?

First off its a 98 turbo ls1 running on a 2000 4.8 pcm.
Any one have tips on how to scale the timing table (s) and any corresponding tables. I'm maxing out at 120 g/cyl at only 6lbs. and don't have the option to edit the vertical or horizontal axes any and all help is welcomed.
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Old Jan 6, 2015 | 05:23 PM
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Also, how does one make the scaner histograms (spark, and KR) read past 1.20 g/cyl

Well I did get the bright idea to log the air mass in the chart display. and it shows I was hitting 1.73 g/cyl at 162.7 kpa but the questions above I would still like answers to. Thanks.

Last edited by LOWnEASY; Jan 6, 2015 at 05:32 PM.
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Old Jan 7, 2015 | 12:11 PM
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What tuning software are you using?
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Old Jan 7, 2015 | 02:53 PM
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Hptuners
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Old Jan 7, 2015 | 03:42 PM
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The HPTuners forums would be a much better place to ask the question
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Old Jan 7, 2015 | 03:42 PM
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I believe I found a good write up.
I didn't know it involved injector scaling. So iv been ignoring all the threads title "injector scaling" wile doing Google searches.
But for any one wondering the same in the future here I'd a good write up
GM Gen IV Calibration Scaling - Injector Dynamics I know it says Gen 4 but same should apply to Gen 3
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Old Jan 7, 2015 | 03:50 PM
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no one has really replied as some dont do their own tuning while others dont always care to share their tricks

if you have tuned NA vehicles then use that theory with some good hindsight
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Old Jan 7, 2015 | 03:54 PM
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Steck and Pohl are great resources
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Old Jan 7, 2015 | 07:51 PM
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Now another problem I'm having is my wideband only reads 15-30 kpa, worked fine before I added the manifold air pressure 2 bar to the table display and added it to the chart display.
My wideband histogram now goes up to 210 kpa and but never goes over 30 kpa and that's at 6-7lbs of boost. My afr error does the same.
Also, the afr on the histogram doesnt match whats shown in the chart display any ideas on that?
here's a cfg and log to show.
Attached Files
File Type: hpl
ls1 boost 2.hpl (192.8 KB, 196 views)
File Type: cfg
ls1 wide band.cfg (2.6 KB, 73 views)
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Old Jan 7, 2015 | 09:34 PM
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I don't know what injectors your running but you shouldn't have to rescale like that article discusses. That's for pcm's that have a low injector limit. And I've never seen a 411 pcm timing table go higher then 1.20 regardless of calculated airflow. Tune your 1.20 column as your WO timing.
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