MAF vs SD
Thread Starter
On The Tree
Joined: May 2012
Posts: 133
Likes: 1
MAF vs SD I am brand new to the LS motor and the pcm wiring
I have a 2003 6l truck motor and 4l80E trans that is going into a 1948 chopped merc
I am intending to run a pair of 71mm turbos on it.
I have most of the parts to do so in hand including a wide band 02 and larger injectors etc etc
In reading many many posts here and on other forums I see reference to converting to Speed Density for better performance and to delete the MAF
Where I get lost is in the actual conversion requirements to do so ie MAP sensor and whatever else is to be installed to make the conversion work.
Is there a thread somewhere I missed to detail this or can someone please to detail the procedure for the necessary hardware, and to what PCM changes may be needed
thanks in advance for your help
Ken
I have a 2003 6l truck motor and 4l80E trans that is going into a 1948 chopped merc
I am intending to run a pair of 71mm turbos on it.
I have most of the parts to do so in hand including a wide band 02 and larger injectors etc etc
In reading many many posts here and on other forums I see reference to converting to Speed Density for better performance and to delete the MAF
Where I get lost is in the actual conversion requirements to do so ie MAP sensor and whatever else is to be installed to make the conversion work.
Is there a thread somewhere I missed to detail this or can someone please to detail the procedure for the necessary hardware, and to what PCM changes may be needed
thanks in advance for your help
Ken
Where I get lost is in the actual conversion requirements to do so ie MAP sensor and whatever else is to be installed to make the conversion work.
12 Second Club
iTrader: (10)
Joined: Sep 2005
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From: From Ohio now in that state up north
To do normal sd you can basically just unhook the maf and use low octane tables.
However if you talking about 2 bar or 3 bar sd for boost you need a 2 bar or 3 bar map sensor and a custom operating system.
However if you talking about 2 bar or 3 bar sd for boost you need a 2 bar or 3 bar map sensor and a custom operating system.
Thread Starter
On The Tree
Joined: May 2012
Posts: 133
Likes: 1
so where does the map sensor and intake air temp fit into this equation as they would definitely be needed for the twin turbos
no issue with the custom operating system - my friend with efi live can do that
we just need to know how and where to hook in the map and intake air temp sensor as in what pins etc
no issue with the custom operating system - my friend with efi live can do that
we just need to know how and where to hook in the map and intake air temp sensor as in what pins etc
Last edited by Seeker1056; Nov 10, 2015 at 04:11 PM.
Unless you are building your own harness which is doubtful, any harness made for the engine/pcm combination will have provisions for those sensors. Some MAFs have the IAT sensors incorporated into them so you may need to break out 2 wires from the MAF connector for IAT.
Thread Starter
On The Tree
Joined: May 2012
Posts: 133
Likes: 1
ok so lets see I f I got this - the maf has the wiring for the intake air temp ? and I need to know which of those wires we are talking about for the maf - can someone tell me?
what pin number in my truck harness that I personally am modifying am I using for the map sensor - I have not ever read in any pinout where that is listed
thanks
what pin number in my truck harness that I personally am modifying am I using for the map sensor - I have not ever read in any pinout where that is listed
thanks
Simple Google search on 2003 Silverado PCM pin out came up with this. You've heard of Google? 
http://lt1swap.com/2000harness.htm
http://lt1swap.com/2000harness.htm
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TECH Enthusiast
Joined: Apr 2009
Posts: 723
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If using a factory PCM you can use HP tuner to run SD to 2.5bars (+22psi). You don't need to do anything to the MAF wiring.
Here is the FAQ
http://www.hptuners.com/help/vcm_edi...to_user_sd.htm There is additional info on tuning SD systems in open loop on the forum.
Here is the over view;
http://www.hptuners.com/products/vcmsuite_enhance.php
Add: Does EFI live offer the same capability?
Here is the FAQ
http://www.hptuners.com/help/vcm_edi...to_user_sd.htm There is additional info on tuning SD systems in open loop on the forum.
Here is the over view;
http://www.hptuners.com/products/vcmsuite_enhance.php
Add: Does EFI live offer the same capability?
Last edited by gtfoxy; Nov 11, 2015 at 04:58 PM.