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I found the ac delco replacement ignition control module but does anyone have the part number for the capacitor that’s goes worth the module/ distributor.
I found the ac delco replacement ignition control module but does anyone have the part number for the capacitor that’s goes worth the module/ distributor.
this is the module I found for 84
#19179581
You might start your day with a 'Thank You' for the fellow who supplied part # and snapshot for an '84 correct oil fill cap!!!
Start your search for a module using the correct original # 1976908 if you've an orig distributor 1103938 or #1988500 if you've a distributor 1103603 . Where those #'s lead you after confirming which distributor you can maybe post back!
Nice, I actually need this.
Mine is pretty ratty... found and ordered on ebay.
Also DUI makes a module that is really close to the original corvette ign module.
(IIRC I think you loose timing if you install a generic Ac delco non corvette module)
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Originally Posted by Gibbles
Nice, I actually need this.
Mine is pretty ratty... found and ordered on ebay.
Also DUI makes a module that is really close to the original corvette ign module. (IIRC I think you loose timing if you install a generic Ac delco non corvette module)
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Like Gibbles has mentioned going to ThirdGen for this discussion. There are various types of modules from GM and others. They are not all created equal and some of the GM modules pull timing, a lot of timing. Latency is a sore subject for a lot of tuners and to get the full potential of any module you need to know what those latency numbers are in relation to small cap HEI and large cap so you can take advantage of the module used. I have a DUI now and I sent a letter to Mr Davis at DUI about the numbers they use in their module so I could add those to my tune. His response was that they don't give that proprietary info out. WHAT?! Why would you not give that out to people using your product so they could take full advantage of your system when tuning? There is a way to find that info out and mine is fairly close right now and there is a marked improvement in the way my motor responds now. I even talked with Bob over at Dynamic EFI about this subject several times and Bob is under the same impression that I have, why would you not provide that info on your module to tuners? Anyway, the latency table issue gets very deep, fast. If you go to the site, get ready to be immersed into the subject.
Last edited by Buccaneer; May 9, 2020 at 12:41 PM.
Nice, I actually need this.
Mine is pretty ratty... found and ordered on ebay.
Also DUI makes a module that is really close to the original corvette ign module.
(IIRC I think you loose timing if you install a generic Ac delco non corvette module)
Yeah I know that rBob of Dynamic EFI fame has found that some of the modules for small cap distributors have different latency characteristics which effects timing. It could be true with the large cap distributor as well but I don’t know for sure. I have a DUI distributor but but Davis won’t release their latency figures so I don’t know how close it is to a factory corvette module.
Edit: I was guilty of not reading to the bottom of the thread and I see that @Buccaneer has provided more complete information on this topic.
Last edited by GregMartin; May 10, 2020 at 09:29 AM.
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Originally Posted by Gibbles
Latency built into the module.
There is a thread on the 3rd gen forum related to DIY tuning and the ebl flash.
I've read the thread a few times, between trips for more caffeine to help me get through it. Very impressed with the dedication and technical thinking of some of the posters there.
I'm trying to locate some technical information on a couple of the modules mentioned in the thread. One item mentioned in there was that perhaps some modules are designed to increase latency to control/limit spark advance and engine performance. I welcome future correction if I am incorrect, but I do not believe that (latency change) postulation/statement is correct. It's very expensive to make hardware changes to a vehicle component (such as an ignition module), given the costs of extra engineering work, validation testing, and documentation/part number/paperwork updates. It's a lot simpler, faster, and cheaper to do those performance modifying features in the spark tables of individual vehicles or engines.
If I have any luck scrounging up any usable information/data on this topic, I'll post it.
Guys side note need some help. I’m replacing a bunch of old parts including the ignition control module I took my msd cap off and I noticed the rotor in this position (picture below) I’m learning whole bunch of new stuff but is it ok in this position when I turned the car off it stayed like this or is it supposed to be in the position of the 1st spark plug I believe it should face front right? Or am I ok? Either way this is the position it stoped at when I turned car off.
Guys side note need some help. I’m replacing a bunch of old parts including the ignition control module I took my msd cap off and I noticed the rotor in this position (picture below) I’m learning whole bunch of new stuff but is it ok in this position when I turned the car off it stayed like this or is it supposed to be in the position of the 1st spark plug I believe it should face front right? Or am I ok? Either way this is the position it stoped at when I turned car off.
It should only be pointing at one if the engine is at top dead center (TDC). Crank the engine and it will turn, if it doesn’t you have bigger problems.
Oh if you’re asking does the engine need to be a TDC to replace the module the answer is no. However if you plan on pulling the distributor out then yes during the engine around to TDC before you do that.
Last edited by GregMartin; May 10, 2020 at 06:05 PM.
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Originally Posted by 69427
I've read the thread a few times, between trips for more caffeine to help me get through it. Very impressed with the dedication and technical thinking of some of the posters there.
I'm trying to locate some technical information on a couple of the modules mentioned in the thread. One item mentioned in there was that perhaps some modules are designed to increase latency to control/limit spark advance and engine performance. I welcome future correction if I am incorrect, but I do not believe that (latency change) postulation/statement is correct. It's very expensive to make hardware changes to a vehicle component (such as an ignition module), given the costs of extra engineering work, validation testing, and documentation/part number/paperwork updates. It's a lot simpler, faster, and cheaper to do those performance modifying features in the spark tables of individual vehicles or engines.
If I have any luck scrounging up any usable information/data on this topic, I'll post it.
Just some more food for thought on this subject. I sent mail to Mr Davis at DUI and asked for the values they use for their module and was told it is proprietary and they don't give that info out. Really? I also recently sent mail to Pertronix asking the same question about their Flame Thrower module. Here is their response... I'm sorry we don't have those charts since we do not program the module. I'm being told it's the CA emission spark timing curve. So, this is useless info as well. I did send another reply asking if there is another contact for this info and waiting for a reply from them, but I'm sure it will be, no we don't have a contact. So, the secret continues on the module saga. If you are brave enough to free rev your motor all the way to 6K and watch the timing, you can get the numbers close to what you need for an installed module. If someone does that...post em up.
Just some more food for thought on this subject. I sent mail to Mr Davis at DUI and asked for the values they use for their module and was told it is proprietary and they don't give that info out. Really? I also recently sent mail to Pertronix asking the same question about their Flame Thrower module. Here is their response... I'm sorry we don't have those charts since we do not program the module. I'm being told it's the CA emission spark timing curve. So, this is useless info as well. I did send another reply asking if there is another contact for this info and waiting for a reply from them, but I'm sure it will be, no we don't have a contact. So, the secret continues on the module saga. If you are brave enough to free rev your motor all the way to 6K and watch the timing, you can get the numbers close to what you need for an installed module. If someone does that...post em up.
So does that imply that a car with the additional CA emissions controls had a different module in the factory distributor? The plot thickens, I always thought Steve Davis’s response was odd maybe he just didn’t know, maybe all the aftermarket modules are made in the same bamboo hut in China.
84 corvette new ignition control module
