Carb Conversion MAP sensor
10-21-2007, 11:33 PM
#4
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We didnt use one with our setup, MSD says this about it
MAP TABLE (MAPtbl)
Note: In order to take advantage of a vacuum advance or retard, a MAP sensor is required.
Note: When plotting a timing curve by using the RPM Table or MAP Table through your PC, there
must NOT be a Timing Module installed. Power-up with a module installed will override the
saved timing plot.
This is a Manifold Absolute Pressure (MAP) chart. It gives you the capability of modifying the timing
curve based on manifold pressure (vacuum or boost). A curve can be created from the MAP Advance
Curve graph on the upper right of the screen. It can also be set with the Hand Held Monitor. The
chart allows you to map out an advance curve based on manifold vacuum (much like the vacuum
advance on a mechanical distributor).
To create a map, simply position the mouse at a point on the chart and right click to add a dot. By
moving the mouse over this point and a left click, the dot changes to red (active) and you can
move it around the map.
Note: The timing has minimum and maximum limits that are set in the Data Editor Menu. These
settings include the cumulative value of any vacuum advance or retard as well as the Switch
Retard if activated.
MAP SENSOR SELECT
Allows the selection of a 1, 2 or 3-bar MAP sensor. This setting should be set to match the MAP
Sensor in use: 1-bar (0-15 psia), 2-bar (0-30 psia), 3-bar (0-45 psia).
MAP TABLE (MAPtbl)
Note: In order to take advantage of a vacuum advance or retard, a MAP sensor is required.
Note: When plotting a timing curve by using the RPM Table or MAP Table through your PC, there
must NOT be a Timing Module installed. Power-up with a module installed will override the
saved timing plot.
This is a Manifold Absolute Pressure (MAP) chart. It gives you the capability of modifying the timing
curve based on manifold pressure (vacuum or boost). A curve can be created from the MAP Advance
Curve graph on the upper right of the screen. It can also be set with the Hand Held Monitor. The
chart allows you to map out an advance curve based on manifold vacuum (much like the vacuum
advance on a mechanical distributor).
To create a map, simply position the mouse at a point on the chart and right click to add a dot. By
moving the mouse over this point and a left click, the dot changes to red (active) and you can
move it around the map.
Note: The timing has minimum and maximum limits that are set in the Data Editor Menu. These
settings include the cumulative value of any vacuum advance or retard as well as the Switch
Retard if activated.
MAP SENSOR SELECT
Allows the selection of a 1, 2 or 3-bar MAP sensor. This setting should be set to match the MAP
Sensor in use: 1-bar (0-15 psia), 2-bar (0-30 psia), 3-bar (0-45 psia).
11-08-2007, 03:28 PM
#5
I am using the msd box on my brothers s10 lq9 but havent powered it up yet. I was planning on plotting my own curve for the truck and using the map. Is there a base timing curve to start tuning from if you dont use the chips or do you start from scratch? I was thinking if there is no base setting to start tuning from I might try plugging in the module powering the box then removing the chip and saving the curve to the box to tune from. Any input??
11-08-2007, 03:40 PM
#6
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I was told that you could use the map sensor to help save on fuel when your running highway speeds. At highway speed (say 70mph) at 2000 rpm you could pull timing back to save your gas mileage. I'm not sure if this is completely correct because I have not looked into it enough to see if this is possible. Just a thought!!!
11-08-2007, 03:52 PM
#7
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I was told that you could use the map sensor to help save on fuel when your running highway speeds. At highway speed (say 70mph) at 2000 rpm you could pull timing back to save your gas mileage. I'm not sure if this is completely correct because I have not looked into it enough to see if this is possible. Just a thought!!!
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11-08-2007, 04:14 PM
#8
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I wouldn't use one. Much like adding a carb, or carbs, you're just contributing to the complexity of the tune.. The more parts that weren't designed to be used in conjuction with one another, the more that can, and will, go wrong...
11-09-2007, 10:46 PM
#9
Actually the map sensor acts like the vacuum advance cannister did on an old style hei or points distributor. Not too much complexity there. Yeah you have to tune it in with a laptop but the same would have to be done for fuel injection. I would say use the map sensor if its a street car. It will advance the timing at light load cruise speeds and save gas. Some of the new hemi's we have at the dealership run almost 40deg advance while cruising. I just noticed yesterday while road tsting one with the scanner. BTW guys are puttin carbs on those things now too and like the ls motors are making comprable power torque and mileage with the "toilet" on top. Now Im sure since I just said that some fuel injection guy is gonna get his panties in a bunch and cry. But oh well. 
11-12-2007, 12:29 PM
#11
No lying here. Note I said comprable mileage not exact mileage I agree the carb will suffer as far as mileage probably 2-3 mpg with a good tune. IMO the 2 overdrive gears in the t-56 make up for any mileage concerns one would have. On the upside, throttle response will be slightly better with the carb. So its a give and take there. I was def interested by your forced induction comment. Do you have any links to information supporting this?? If so I would be interested in seeing them as I plan to go forced induction and have not seen any writeups supporting this claim.
11-12-2007, 05:41 PM
#14
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10.60's when my car was 3600lbs and a 4150 style carb......... Then I grew up and went EFI....
So I know you're not typing to me...
And he said TR was better, not "fine"... and since you opted for the lazy route, I'm not sure how you would know how it compares to EFI....
So I know you're not typing to me...
And he said TR was better, not "fine"... and since you opted for the lazy route, I'm not sure how you would know how it compares to EFI....
11-13-2007, 07:50 AM
#15
i have a quest. about the msd-6010 box-i am going to start out with a carb, run the 6010 ign, and cant seem to find much about the msd-60101 wiring harness, if its needed with the box, or just a replacement shorter harness, not needed if box is in a remote loc.
also, it looks like when i (and if) change over to f/i, i can use the same box with a 8886 wiring harness to fire the f/i, then when (and if) i switch over to a 4l80e trans, i will switch over to a comp diff harness/ecu
i know, i could use f/i and 4l80e at first, but not what i want to do, as i have problems with computers, as witnessed by one hanging in my garage with 15 shots thru it from an old assult rifle
plus im running a procharger, and know how to tune a carb for them
also, it looks like when i (and if) change over to f/i, i can use the same box with a 8886 wiring harness to fire the f/i, then when (and if) i switch over to a 4l80e trans, i will switch over to a comp diff harness/ecu
i know, i could use f/i and 4l80e at first, but not what i want to do, as i have problems with computers, as witnessed by one hanging in my garage with 15 shots thru it from an old assult rifle
plus im running a procharger, and know how to tune a carb for them
11-13-2007, 07:59 AM
#17
i have a quest. about the msd-6010 box-i am going to start out with a carb, run the 6010 ign, and cant seem to find much about the msd-60101 wiring harness, if its needed with the box, or just a replacement shorter harness, not needed if box is in a remote loc.
also, it looks like when i (and if) change over to f/i, i can use the same box with a 8886 wiring harness to fire the f/i, then when (and if) i switch over to a 4l80e trans, i will switch over to a comp diff harness/ecu
i know, i could use f/i and 4l80e at first, but not what i want to do, as i have problems with computers, as witnessed by one hanging in my garage with 15 shots thru it from an old assult rifle
plus im running a procharger, and know how to tune a carb for them
also, it looks like when i (and if) change over to f/i, i can use the same box with a 8886 wiring harness to fire the f/i, then when (and if) i switch over to a 4l80e trans, i will switch over to a comp diff harness/ecu
i know, i could use f/i and 4l80e at first, but not what i want to do, as i have problems with computers, as witnessed by one hanging in my garage with 15 shots thru it from an old assult rifle
plus im running a procharger, and know how to tune a carb for them
11-13-2007, 05:26 PM
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The msd-60101 harness is just an extension harness for running the msd box on a LS (LS6 and LS2 i think) motor with the cam position sensor on the front timing cover. If you remote mount your box close enough you shouldn't have to use the extension harness.
