Dumping the Optispark for good
Thread Starter
Intermediate
Joined: Feb 2011
Posts: 33
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We may need some of the guru's to confirm this, however if you plan to retain the LT1 PCM you can't completely ditch the opti.
At the very least the PCM needs the low resolution signal of the opti wheel to dictate engine TDCS to trigger firing.
You can make some adaptations to the crank wheel like the 96's have and put a decoder wheel there to id cyclinder positions (they exist and are made), but your running stand alone system.
The engine will run without the high resolution signals and set a DTC, but it needs the low res signal at the very least to run.
See this image below. There are 8 windows on the wheel that id the cylinder for the PCM.
http://www.corvetteactioncenter.com/...optispark8.jpg
At the very least the PCM needs the low resolution signal of the opti wheel to dictate engine TDCS to trigger firing.
You can make some adaptations to the crank wheel like the 96's have and put a decoder wheel there to id cyclinder positions (they exist and are made), but your running stand alone system.
The engine will run without the high resolution signals and set a DTC, but it needs the low res signal at the very least to run.
See this image below. There are 8 windows on the wheel that id the cylinder for the PCM.
http://www.corvetteactioncenter.com/...optispark8.jpg
I am not sure about the "stock" ECU, but if you swap it out for the '411 this is a piece of cake, plus the '411 has a faster processor, if my memmory is correct
Thread Starter
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here is the February, 2009 issue of Popular Hot Rodding article about converting from TBI to LT1 intake, I will be taking it to the next level. To get the gains of sequential injection
http://www.popularhotrodding.com/tec...ls1/index.html
http://www.popularhotrodding.com/tec...ls1/index.html
Last edited by tinbender59; Feb 24, 2011 at 07:19 PM.
Thread Starter
Intermediate
Joined: Feb 2011
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If you really want to get rid of the Opti, do this kit. Then you can tune it so much better with more modern software.
http://www.eficonnection.com/eficonnection/24x.aspx
http://www.eficonnection.com/eficonnection/24x.aspx
Safety Car
Joined: Jan 2004
Posts: 3,556
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Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
From the factory, LT1 and LT4 engines do not have a keyway in the crankshaft hub -- aftermarket hubs are available with keyways.
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I am doing an all out mod on my application, so it is not a big deal for me. but in a factory LT vehicle???? may be a dog of a different color?? when I am finished with my install, I will look into the "stock ECM" possabilities.
Burning Brakes
Joined: Apr 2001
Posts: 1,209
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From: Toronto Ontario
St. Jude Donor '13
It's a very endless list of possibilities when we start talking about new wire harnesses and new ECU's. I think the initial context of your post made readers think you were just looking to ditch the opti with minimal hardware upgrades.
I think this solves the questions about ditching the opti; it is only really possible with the application of considerable funds and hardware changes. Most people won't opt for this type of project.
I like where you are going though.
Good luck with it.
I think this solves the questions about ditching the opti; it is only really possible with the application of considerable funds and hardware changes. Most people won't opt for this type of project.
I like where you are going though.
Good luck with it.
Thread Starter
Intermediate
Joined: Feb 2011
Posts: 33
Likes: 0
It's a very endless list of possibilities when we start talking about new wire harnesses and new ECU's. I think the initial context of your post made readers think you were just looking to ditch the opti with minimal hardware upgrades.
I think this solves the questions about ditching the opti; it is only really possible with the application of considerable funds and hardware changes. Most people won't opt for this type of project.
I like where you are going though.
Good luck with it.
I think this solves the questions about ditching the opti; it is only really possible with the application of considerable funds and hardware changes. Most people won't opt for this type of project.
I like where you are going though.
Good luck with it.
dont give up just yet, let me get mine done then I'll look into the stock ECM, by the way anybody have the Corvette wiring in software format that they could send me to resarch this issue. I am an electronics tech by training and 31 years experience. I should be able to figure it out, if not I know people!!!
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Le Mans Master
Joined: Sep 2005
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From: Jenks OK
I've thought about doing a coil on plug conversion and updating the ecm to one out of an express van out of my own sick curiosity. But I have other priorities first. Looking forward to seeing how it goes!
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