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Carbed or EFI timing

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Old 01-01-2007, 08:43 PM
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Default Carbed or EFI timing ?

How much timing are you guys runing. The pills that come with the msd box are around 36* at wot. I compaired that with a friends efi timing curve and his was around 28* at wot.We have the same cam but mine is a 6.0L the only other diff is efi and carbed. His car was tuned on a dyno so i know the tune is close to where it needs to be.It put down 398rwhp/388rwtq cam only m6. I kicked it when i had a #2 pill in my msd box and it was pulling good. I put a timing curve in the box that matched his curve . We went and kicked it again and it pulled alot slower.I am afraid to put the 36* back in and have detination problems which is hard for me to detect with loud exhaustand no knock sensors. Any info would be a great help

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Old 01-01-2007, 09:42 PM
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I have been wondering the same thing. I know on sbc i set it to be all in around 2200 at around 36 degrees. Had a good converter of course. I dont think msd would have the pug in pill be way to much timing.
Old 01-01-2007, 10:11 PM
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every car is different. get yourself a set of jets and tune it at the track
Old 01-02-2007, 03:25 PM
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I understand every car is different but there is got to be a point where 10.5to1 comp, 93 octane starts to to have to much timing and detonates no matter what car its in. my ? was how much timing are you guys running and do you think 36* is to much, not enough. The tracks are closed and I would like to get the timing closer before I go to the dyno.The spark plugs look very good in reference to air/fuel and show no signs of detonation
Old 01-02-2007, 10:12 PM
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i ran all 6 pills at the track with no change in e.t.
makes sense to me cause there all 36 deg. total and i have a big converter.
its also my under standing that fi needs less timing because
the fuel enters at such a high pressure.it also enters closer to the chamber.
Old 01-02-2007, 10:39 PM
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how does your msd box know when your are wot ? is it the map sensor?
Old 01-02-2007, 10:57 PM
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lq9s10

Send this guy a PM, I know of his truck and Im pretty sure its carb'd and runs pretty good.... may have an idea.
Old 01-03-2007, 02:13 PM
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Originally Posted by 94ls1bird
how does your msd box know when your are wot ? is it the map sensor?
i assume the same way it sends a tach signal.
the box can read rpm from crank sensor.
Old 01-03-2007, 02:20 PM
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you are correct s10slepper. the box only knows rpm not wot. sorry if the wot statment was misleading
Old 01-03-2007, 02:37 PM
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Im no expert at all but when reading about blow through carb setups and timing on other forums people talked about how much they could run with a carb and would never be able to run as much with FI. I cant tell you why but people were saying it.
Old 01-03-2007, 07:44 PM
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Originally Posted by 6L.IROC-Z
you are correct s10slepper. the box only knows rpm not wot. sorry if the wot statment was misleading
You may be corect it would know wot do to the map sensor it knows wot when 0 vac occurs. I have the 6010 and would like to know if you can some how retard timing when postive vac occurs for a blow thru turbo setup
Old 01-03-2007, 08:12 PM
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The way i understand the map table is that will add timimg at a given vacum, the lowest value on the timing side of the table is zero. So i dont think it will retard timing. but im still learnig the tuning program that came with the 6010 box. i would call msd about that.
Old 01-03-2007, 08:48 PM
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i will be using the 6010 with megasquirt controlling the injectors. Form what I have read online I think it can compensate for boost. I have not yet got my car running but I have played around with the software. As far as I can tell it only adds timing, unless the x-axis is in increasing psia of boost???

I would love to find out if it can to boost retard



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