LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Why is the physical reason you cant upgrade an LT1 to have an LS1 Ignition?

Old Dec 6, 2003 | 03:12 PM
  #1  
kmook's Avatar
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Why is the physical reason you cant upgrade an LT1 to have an LS1 Ignition?

I have not looked much in depth to what makes a LS1 ignition tick, but out of everything ive ever read you cant adapt it to an LT1. My question is why spacifically you can't...

Anyone know?
Thanks.
Old Dec 6, 2003 | 03:22 PM
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To run the exact LS-1 ignition, I believe you would have to have some sort of stand alone computer for the ignition. Personally, I believe it has something to do with the way the computers read timing. LT-1 using the opti for a signal, and LS-1 using ths crank sensor if I'm not mistaken. But it makes you wonder, people delete the CPS sensor on LT-1 cars all day long. I would think that if you had the proper wiring harness and a good tuner, you may be able to to get a timing refrence from the CPS sensor. Thus allowing you to use the LS-1 ignition on a LT-1. In the end, I think it is just to expensive for the average joe to mess with.
Old Dec 6, 2003 | 04:09 PM
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THe two systems are diffent in many aspects, it is kind of like comparing apples and oranges. They are both fruits but are different. In the case of the LT1 the ignition has one coil for all 8 cylinders while the LS1 has a sperate coil for each cyliner. And as stated before the computer mangement for the two system differ greatly. Can a LS1 system be made to work on a LT1, yes, but the cost, time, "jerryrigging", etc can be quite a bit. Hope this helps.
Old Dec 6, 2003 | 05:27 PM
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I'm not worried about costs or if the conversion would be cost effective.

Good info Jason.

Last edited by kmook; Dec 6, 2003 at 05:30 PM.
Old Dec 6, 2003 | 05:29 PM
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doesnt the LTCC and the delteq answer these problems? or are you trying to do it your self?
Old Dec 6, 2003 | 05:30 PM
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Originally posted by kmook
I am just asking about why the ls1 ign cant be adapted on a lt1 vehicle.
Who said that it couldn't??
Old Dec 6, 2003 | 05:42 PM
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Originally posted by 93formula
doesnt the LTCC and the delteq answer these problems? or are you trying to do it your self?
I am not looking for an opti alternative; I know there are many products out there like those you mentioned. I am discussing the Ls1 Ign in specific in this thread.

Originally posted by Beast96Z
Who said that it couldn't??
Many people have to me,
But I’ve yet to see anything specifically say why you can’t or if you can what you have to do to make it work...

Last edited by kmook; Dec 6, 2003 at 05:46 PM.
Old Dec 6, 2003 | 05:58 PM
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perhaps the advance tech guys may have an answer
Old Dec 6, 2003 | 08:31 PM
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http://web.camaross.com/forums/showt...threadid=86069
Maybe this will be some help.
Old Dec 7, 2003 | 05:53 PM
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Re: Why is the physical reason you cant upgrade an LT1 to have an LS1 Ignition?

Originally posted by kmook
I have not looked much in depth to what makes a LS1 ignition tick, but out of everything ive ever read you cant adapt it to an LT1. My question is why spacifically you can't...

Anyone know?
Thanks.
From what little I know, I'm confident it is hard coded in the pcm. Got a hex editor, AND preferably, a GM pcm engineer as a tour guide?

Actually, cuz several were involved in the pcm software 'construction', you'd need the one(s) connected with the ignition code input.

Edit: This does not take into account, the possibility, of some physical component differences between pcms.

I realize I'm not telling you anything, but, if uncertain, now others may understand where you are coming from.

Last edited by arnie; Dec 7, 2003 at 06:02 PM.
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