Rear distributor questions
Rear distributor questions i have a 94 formula that has a messed up optispark. i have seen some people install small heis in their standard lt1 intake. how do you do it? i have all the machining equipment at my disposal. is there any computer problems if you switch?
sorry if the topic is old but for some reason the searched is messed for me
sorry if the topic is old but for some reason the searched is messed for me
i would replace the opti with a GM opti,upgrade to a vented opti.
then purchase the Ltcc or Delteq ignition system.
it will cost you a few bucks to do this but it better than modding the car to accept a rear mounted ditributor (IMHO)
then purchase the Ltcc or Delteq ignition system.
it will cost you a few bucks to do this but it better than modding the car to accept a rear mounted ditributor (IMHO)
Launching!
Joined: Nov 2007
Posts: 271
Likes: 0
From: Moore Oklahoma
With the LT PCM engine management system, the distributor must provide high and low resolution pulses back to the PCM. If you went with the rear mount, you'll need a distributor that provide the pulses. I'm not sure if that is available off-the-shelf.
Personally, I like the MSD Opti.
WD
Personally, I like the MSD Opti.
WD
Launching!
Joined: Sep 2007
Posts: 245
Likes: 1
From: Clover, South Carolina
Love the red on black look in that picture. That's a sweet looking setup. Curious as to longevity and quality though with the MSD name. Personally I have not had problems with their stuff, but we hear so much about about them with concerns about quality.
You are right, but in the end product you still have a OPTI! So its a catch 22 there. Personially when mine craps out im goinf with the LTCC set up. And word on the streets is to buy coils off a truck, they produce more spark then OEM ls1 coils.
you still need a good opti sensor. for it to work
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stock GM piece for me... no problems at all. main thing, everyone knocks the opti, but in reality if you fix leaks before they soak it they usually hold up pretty well... (as in vented opti)
With the LT PCM engine management system, the distributor must provide high and low resolution pulses back to the PCM. If you went with the rear mount, you'll need a distributor that provide the pulses. I'm not sure if that is available off-the-shelf.
Personally, I like the MSD Opti.
WD
Personally, I like the MSD Opti.
WD
You don’t have to eliminate the OPTI to run a standard distributor. You could leave the opti in place to give a signal back to the computer, just pull out the rotor so it not generating any spark. Then the computer is getting the signal it needs to run the injectors, and you let the distributor take care of the ignition. I am thinking about giving this a try this winter. I think it would be cheaper than some of the other options.
Joined: May 2002
Posts: 3,299
Likes: 2
From: windsor, ont. canada - Home of the fastest LT1 6spd.
i went the rear dist. mount and do not regret it one bit!!!!! one of the best mods i have ever done to the engine combo 
i am merely running a gm 95-7 pickup truck distributor, lol! nothing fancy.
i am merely running a gm 95-7 pickup truck distributor, lol! nothing fancy. hows the foot coming along?
do you have any pics of your rear dist. conversion?
can you tell me what you did to get it to work?
TECH Senior Member
iTrader: (3)
Joined: Oct 2006
Posts: 7,564
Likes: 4
From: Decatur, TN (N-W of Athens)
From my recollection, it does.
At any rate, from when my friend repaired a Vortec 4.3, I took note at how that distributor worked (crab cap). It seemed EXACTLY like an Optispark, but rear mount. The Coil and Spark Control was the same as ours as well. The Crab Cap style uses a Cam Sensor inside the distributor, which I'm pretty sure is an optical sensor like ours. I've mentioned this before, but none of us have ever had a chance to test it, so :\ GO AT IT! lol
At any rate, from when my friend repaired a Vortec 4.3, I took note at how that distributor worked (crab cap). It seemed EXACTLY like an Optispark, but rear mount. The Coil and Spark Control was the same as ours as well. The Crab Cap style uses a Cam Sensor inside the distributor, which I'm pretty sure is an optical sensor like ours. I've mentioned this before, but none of us have ever had a chance to test it, so :\ GO AT IT! lol
Launching!
Joined: Nov 2007
Posts: 271
Likes: 0
From: Moore Oklahoma
From my recollection, it does.
At any rate, from when my friend repaired a Vortec 4.3, I took note at how that distributor worked (crab cap). It seemed EXACTLY like an Optispark, but rear mount. The Coil and Spark Control was the same as ours as well. The Crab Cap style uses a Cam Sensor inside the distributor, which I'm pretty sure is an optical sensor like ours. I've mentioned this before, but none of us have ever had a chance to test it, so :\ GO AT IT! lol
At any rate, from when my friend repaired a Vortec 4.3, I took note at how that distributor worked (crab cap). It seemed EXACTLY like an Optispark, but rear mount. The Coil and Spark Control was the same as ours as well. The Crab Cap style uses a Cam Sensor inside the distributor, which I'm pretty sure is an optical sensor like ours. I've mentioned this before, but none of us have ever had a chance to test it, so :\ GO AT IT! lol
The rear mount distributor on an F-Body (under the cowling) whould be painfull!
WD
On The Tree
Joined: Dec 2007
Posts: 110
Likes: 0
You don’t have to eliminate the OPTI to run a standard distributor. You could leave the opti in place to give a signal back to the computer, just pull out the rotor so it not generating any spark. Then the computer is getting the signal it needs to run the injectors, and you let the distributor take care of the ignition. I am thinking about giving this a try this winter. I think it would be cheaper than some of the other options.
I am running a msd opti with no rotor(with stock pcm) to control the fuel and a rear mout msd distributer with a crank trigger to set the timing.I think you only need a setup like this if you have a solidroller and are going over 7k rpm
this is the rear mount I have
http://www.msdignition.com/2006/06-11.htm