timing curve MSD 6012 L92 carburated
06-28-2010, 12:45 PM
#41
Staging Lane
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someone know the best way to know if i have detonation? when cruising, whit MAP sensor, timing go up to 40 deg at 3500 rpm.... Knock sensor are not used whit the MSD 6012 box, so what is the way to hear, toknow if my motor make some detonation ?
06-29-2010, 11:11 PM
#42
Whit the trottle plate open? i dont understand why i only have 6 psia!!! but i can not figure that you can have good performance if you have 14 psia at WOT... whit pills #4, you will only have 16 deg at 5000 rpm, and 19 deg at 6000 rpm... and you need 32-33... you need to add 14-15 degre whit the vacuum advance!!! Try to find a inverter or a good battery and let me know the result when drive whit it.
What is the reading whit motor on, at idle? when you hit the pedal ?
My MAP sensor is a American standard AS59.
What is the reading whit motor on, at idle? when you hit the pedal ?
My MAP sensor is a American standard AS59.
I made a custom curve with 15 from 0rpm to 1000rpm, then ramp up to 33* @2000rpm, all the way to redline.
vacuum advance is 15* @ 0psia, tapering off to 0* @ 10psia.
seems to run decent, but this is my first timing curve, and I will continue to experiment.
For your map sensor issue(6psia) I would unplug it and turn ignition on w/ laptop connected, and see what the msd software shows you is happening. then plug it back in and see what changes???? the map sensor should be showing you atmosheric pressure w/ ignition on and engine off, throttle open or closed( it shouldnt matter),
sorry I cant remember the map reading on my engine at idle, and it may take a little while to get a laptop hooked back up to it, but I will definately share any results I have.
Barrett
06-30-2010, 07:30 AM
#43
Staging Lane
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When i disconnect the MAP sensor, i have 1.1psi reading.. that add +20 degre. When it's connected, i have 6 psi.... i dont know why... i will remake the test this evening whit my laptop ! i will came back whit result.
33 deg WOT is the best timing for my car... 35 is too high, and 31 have not the same trottle..
put 33 at 3000 rpm... 33 at 2000 is a little sooner. and cruise must be about 38-40 deg.
Conenct your pc, chek whit motor off, motor idle, an motor at 3000 rpm... for see the PSIa and the total timing advance.
33 deg WOT is the best timing for my car... 35 is too high, and 31 have not the same trottle..
put 33 at 3000 rpm... 33 at 2000 is a little sooner. and cruise must be about 38-40 deg.
Conenct your pc, chek whit motor off, motor idle, an motor at 3000 rpm... for see the PSIa and the total timing advance.
06-30-2010, 09:48 AM
#44
your right about the timing curve in pill 4. It looks like crap.
I made a custom curve with 15 from 0rpm to 1000rpm, then ramp up to 33* @2000rpm, all the way to redline.
vacuum advance is 15* @ 0psia, tapering off to 0* @ 10psia.
seems to run decent, but this is my first timing curve, and I will continue to experiment.
For your map sensor issue(6psia) I would unplug it and turn ignition on w/ laptop connected, and see what the msd software shows you is happening. then plug it back in and see what changes???? the map sensor should be showing you atmosheric pressure w/ ignition on and engine off, throttle open or closed( it shouldnt matter),
sorry I cant remember the map reading on my engine at idle, and it may take a little while to get a laptop hooked back up to it, but I will definately share any results I have.
Barrett
I made a custom curve with 15 from 0rpm to 1000rpm, then ramp up to 33* @2000rpm, all the way to redline.
vacuum advance is 15* @ 0psia, tapering off to 0* @ 10psia.
seems to run decent, but this is my first timing curve, and I will continue to experiment.
For your map sensor issue(6psia) I would unplug it and turn ignition on w/ laptop connected, and see what the msd software shows you is happening. then plug it back in and see what changes???? the map sensor should be showing you atmosheric pressure w/ ignition on and engine off, throttle open or closed( it shouldnt matter),
sorry I cant remember the map reading on my engine at idle, and it may take a little while to get a laptop hooked back up to it, but I will definately share any results I have.
Barrett
When i disconnect the MAP sensor, i have 1.1psi reading.. that add +20 degre. When it's connected, i have 6 psi.... i dont know why... i will remake the test this evening whit my laptop ! i will came back whit result.
33 deg WOT is the best timing for my car... 35 is too high, and 31 have not the same trottle..
put 33 at 3000 rpm... 33 at 2000 is a little sooner. and cruise must be about 38-40 deg.
Conenct your pc, chek whit motor off, motor idle, an motor at 3000 rpm... for see the PSIa and the total timing advance.
33 deg WOT is the best timing for my car... 35 is too high, and 31 have not the same trottle..
put 33 at 3000 rpm... 33 at 2000 is a little sooner. and cruise must be about 38-40 deg.
Conenct your pc, chek whit motor off, motor idle, an motor at 3000 rpm... for see the PSIa and the total timing advance.
06-30-2010, 12:52 PM
#45
Staging Lane
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OK.. i made test after diner
...
If the MSD is set for 1 bar map sensor, i have 6.1psia at motor off, about 4psia at 1000 rpm, and if i disconnect it, i have 1.1psia. If i change it for 2 bar map sensor in the msd software, and send modification to the msd, the reading change... I have 11.3psia motor off, about 7-8 psia at 1000 rpm, and if i disconnect it, i have 0.8psia. i can not have 14.7... If i change it for a 3 bar, i have 16.6 psia motor off!
The Map sensor is brand new from American Standard.. # AS59... the original Map of this motor was a GM 9359409, and was broken.. I bought the replacement part. The same map sensor, GM 9359409 is on my 2007 5.3L truck...
If i dont have 14.7, it's may-be the map that not work good, or the map is not a 1 bar map.. and not a 2 bar map... and not a 3bar map.. it can be a 2.5 bar map?
Any way, the result is the same... WOT the car run about 33 deg, and on the cruise, it go at about 39 degre... The map give me 20 more degre on cruise, and give me 14-15 more degre WOT ( 6 psia)
If i set up it whit 2bar map sensor, i will need to change my vaccum advance curve...for have +15 at about 10-11 psia
...If the MSD is set for 1 bar map sensor, i have 6.1psia at motor off, about 4psia at 1000 rpm, and if i disconnect it, i have 1.1psia. If i change it for 2 bar map sensor in the msd software, and send modification to the msd, the reading change... I have 11.3psia motor off, about 7-8 psia at 1000 rpm, and if i disconnect it, i have 0.8psia. i can not have 14.7... If i change it for a 3 bar, i have 16.6 psia motor off!
The Map sensor is brand new from American Standard.. # AS59... the original Map of this motor was a GM 9359409, and was broken.. I bought the replacement part. The same map sensor, GM 9359409 is on my 2007 5.3L truck...
If i dont have 14.7, it's may-be the map that not work good, or the map is not a 1 bar map.. and not a 2 bar map... and not a 3bar map.. it can be a 2.5 bar map?
Any way, the result is the same... WOT the car run about 33 deg, and on the cruise, it go at about 39 degre... The map give me 20 more degre on cruise, and give me 14-15 more degre WOT ( 6 psia)
If i set up it whit 2bar map sensor, i will need to change my vaccum advance curve...for have +15 at about 10-11 psia
