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From 99 LS1 motor to LS3 how easy

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Old Aug 26, 2013 | 08:41 PM
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Default From 99 LS1 motor to LS3 how easy
I have a 70 chevelle with a 99 ecm and harness,and LS6 motor,im selling this longblock and keeping the harness and ecm,im wanting to install a 08+ LS3 what all will I have to do for this to work with the 99 ecm and harness ?
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Old Aug 26, 2013 | 09:44 PM
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Adapters and retune
Lingenfelter makes a crank/cam adapter
Racetronix makes a few different adapters(knock relocation and type change, MAF, injectors)
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Old Aug 27, 2013 | 03:48 AM
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Originally Posted by maroonls1z
Adapters and retune
Lingenfelter makes a crank/cam adapter
Racetronix makes a few different adapters(knock relocation and type change, MAF, injectors)
Sounds about right! Im doing the same swap.
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Old Aug 27, 2013 | 02:14 PM
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Do yourself a favor, tap the LS3 block for the LS1 knock sensors rather than using the Racetronix adapters. Nothing wrong with the adapter itself, but the LS1 PCM does not play nice with the LS3 knock sensors.. ask me how I know!
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Old Aug 27, 2013 | 05:27 PM
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Who needs knock sensors,those are optional lol. Turn them off they just take away timing anyway if you don't have a good timing table.
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Old Aug 27, 2013 | 10:53 PM
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I prefer to keep my pistons in one piece. :-) I'll probably be going this route some time in the future. That or an LS7.
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Old Aug 28, 2013 | 07:46 AM
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if you build a new knock table i dont see why one type would be better than another type?
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Old Aug 28, 2013 | 08:33 AM
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It may not be cost effective, but it would be better to switch the reluctor ring to the 24x instead of using an adapter that does signal conversion. I dont trust those and there will be a degree of latency. Or get a new harness and computer to work with the 58x wheel, probably get a cheap truck one.
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Old Aug 28, 2013 | 05:01 PM
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Originally Posted by schnellttz06
It may not be cost effective, but it would be better to switch the reluctor ring to the 24x instead of using an adapter that does signal conversion. I dont trust those and there will be a degree of latency. Or get a new harness and computer to work with the 58x wheel, probably get a cheap truck one.
was just about to state this same thing but you beat me to it
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Old Aug 28, 2013 | 07:02 PM
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Lol, well great minds think alike.
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Old Aug 28, 2013 | 08:38 PM
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Can you change the reluctor ring very easy without taking out or swapping the crank ?
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Old Aug 28, 2013 | 08:51 PM
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no the crank has to come out and there is a special tool used to install it in the correct position.
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