How to make a 2 BAR MAP work with a GM 8D #1227727 ECM?
12-13-2011, 05:06 PM
#1
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Join Date: Dec 2011
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How to make a 2 BAR MAP work with a GM 8D #1227727 ECM?
Hi Folks,
First post. I tried searching and goggling for help on this but my extensive efforts were not fruitful.
I have a L98 350 TPI from a 90 Vette running the stock vette 8D ECM with a Procharger 600b. I am a novice tuner so please take that into consideration when you explain this to me.
I was advised that I could get a better tune if I used a 2 BAR MAP instead of the stock 1 BAR MAP. I purchased a 2 BAR MAP for a 87 Buick GNX, and cut the key ways so I could plug the MAP into the stock connector.
Some of the posts I found said others have switched to 2 BAR maps in "similar" GM ECM's by just halving the VE to MAP table. I tried cutting my current VE to MAP table by 1/2 but the car will not start or run when I install the 2 BAR MAP. So I assume there are more changes needed. It kind of shuddered. Reinstalling the stock 1 bar MAP and the car runs good.
I was hoping someone could guide me on how to get the #1227727 ECM to work with a 2 BAR MAP.
Or is it impossible?
Thank you in advance.
First post. I tried searching and goggling for help on this but my extensive efforts were not fruitful.
I have a L98 350 TPI from a 90 Vette running the stock vette 8D ECM with a Procharger 600b. I am a novice tuner so please take that into consideration when you explain this to me.
I was advised that I could get a better tune if I used a 2 BAR MAP instead of the stock 1 BAR MAP. I purchased a 2 BAR MAP for a 87 Buick GNX, and cut the key ways so I could plug the MAP into the stock connector.
Some of the posts I found said others have switched to 2 BAR maps in "similar" GM ECM's by just halving the VE to MAP table. I tried cutting my current VE to MAP table by 1/2 but the car will not start or run when I install the 2 BAR MAP. So I assume there are more changes needed. It kind of shuddered. Reinstalling the stock 1 bar MAP and the car runs good.
I was hoping someone could guide me on how to get the #1227727 ECM to work with a 2 BAR MAP.
Or is it impossible?
Thank you in advance.
Last edited by Flame Red; 12-13-2011 at 05:23 PM.
12-14-2011, 11:03 PM
#2
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Join Date: Dec 2003
Location: Richmond,ca
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12-19-2011, 04:32 PM
#3
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Location: Austin, TX
Posts: 151
Re: How to make a 2 BAR MAP work with a GM 8D #1227727 ECM?
01-10-2012, 09:57 AM
#4
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Join Date: Jul 2007
Location: Pittsburgh
Posts: 353
Re: How to make a 2 BAR MAP work with a GM 8D #1227727 ECM?
Somebody rewrote a code for boost with 8D but I've never seen it completed or used. it was never given out to the public.
To use a 2 or 3 bar map on GM ecm, you would want to use the 730 or 749 ecm's and run Code $59 from turbo trucks. Code59.org I believe you can find all the information. Thats what I use in my 401 twin turbo. 800+ hp on motor on the old setup.
To use a 2 or 3 bar map on GM ecm, you would want to use the 730 or 749 ecm's and run Code $59 from turbo trucks. Code59.org I believe you can find all the information. Thats what I use in my 401 twin turbo. 800+ hp on motor on the old setup.
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