Secondary relay module questions - ZR-1 Net Registry Forums

-=Jeff=- · 07-12-2008

There is a post on CF as well, but I had some questions regarding the module.

in that other post, someone said the module was used 90-92 and 93-95 did no and it was in the ECM.. since the replacement ECM is the same for all years (although Kurt's website only states 90-94) then couldn't the module be eliminated and the wiring/harness/ PROM be made to work without the Relay module?

I am trying to understand the logic, if the 90 has the module, but I use a ECM that can be used in a 93 in my 90 and it works, I would think you could change something to eliminate the relay module if needed.

Now I could be all wrong ont he relay module as I am going by what I read in another post..

lbszr · 07-12-2008

I heard and thought the same thing

http://www.zr1netregistry.com/forum/...ead.php?t=5565

-=Jeff=- · 07-12-2008

Quote:

Originally Posted by lbszr

I heard and thought the same thing

http://www.zr1netregistry.com/forum/...ead.php?t=5565

THANKS!!!

Now THAT makes sense.. it was not eliminated just moved.. LOL

65ZR1 · 07-13-2008

The secondary injector modules were used for all years. However, the 90 model had a seperate knock module that was later integrated with the ECM. When I had a custom harness made for my 94 LT5 to allow it to run in a 65 coupe the company eliminated the modules and used a relay. They said it would work fine. This appears to make sense since the modules seem to be just an on/off switch. The pulse of the secondary injector is still controlled by the primary injector ground circuit though the ECM. I wasnt confident enough to try this route since I thought the general must have used a more expensive module for some reason. I guess when we cant find any then someone will give it a shot!

lbszr · 07-17-2008

Quote:

Originally Posted by 65ZR1

The secondary injector modules were used for all years. However, the 90 model had a seperate knock module that was later integrated with the ECM. When I had a custom harness made for my 94 LT5 to allow it to run in a 65 coupe the company eliminated the modules and used a relay. They said it would work fine. This appears to make sense since the modules seem to be just an on/off switch. The pulse of the secondary injector is still controlled by the primary injector ground circuit though the ECM. I wasnt confident enough to try this route since I thought the general must have used a more expensive module for some reason. I guess when we cant find any then someone will give it a shot!

Who made your harness? Might need to figure out a different ignition system someday also.

XfireZ51 · 07-18-2008

Quote:

Originally Posted by lbszr

Who made your harness? Might need to figure out a different ignition system someday also.

It would be interesting to adapt the LS coil packs to the LT-5. Some people suggest that the coil packs along with the short plug wires account for 25+ hp.

65ZR1 · 07-22-2008

Quote:

Originally Posted by lbszr

Who made your harness? Might need to figure out a different ignition system someday also.

The company is called the detail zone and makes conversion harnesses for street rods etc. He did have a hard time getting some of the LT5 connectors so the harness took about 8 months to complete. It was a top notch job though.

-=Jeff=- · 08-02-2008

It is the 9 slot that messes it up for the eDIST. but I know the eDIST would work using the ECM timing.. meanign the ECM timing out would feed the eDIST.

Also Paul, remember, the ignition module fires the 2 plugs, with a new set up, you would have a different ignition so the 2 fires per plug is a non-issue.

I will look into it, I am not sure exactly what would work though. I would need to look into it a bit more, maybe this winter

XfireZ51 · 08-02-2008

=Jeff=,

We may want to check with RBob and Jeremy.

-=Jeff=- · 08-02-2008

Quote:

Originally Posted by XfireZ51

=Jeff=,

We may want to check with RBob and Jeremy.

Sure

07-12-2008	#1
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,137	Secondary relay module questions There is a post on CF as well, but I had some questions regarding the module. in that other post, someone said the module was used 90-92 and 93-95 did no and it was in the ECM.. since the replacement ECM is the same for all years (although Kurt's website only states 90-94) then couldn't the module be eliminated and the wiring/harness/ PROM be made to work without the Relay module? I am trying to understand the logic, if the 90 has the module, but I use a ECM that can be used in a 93 in my 90 and it works, I would think you could change something to eliminate the relay module if needed. Now I could be all wrong ont he relay module as I am going by what I read in another post.. __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

07-12-2008	#2
lbszr Join Date: Nov 2006 Location: dayton,ohio Posts: 425	Re: Secondary relay module questions I heard and thought the same thing http://www.zr1netregistry.com/forum/...ead.php?t=5565 __________________ [FONT=Comic Sans MS][COLOR=red]"I wanna go fast!!"[/COLOR][/FONT] [FONT=Comic Sans MS][COLOR=#ff0000]-- Ricky Bobby[/COLOR][/FONT]

07-13-2008	#4
65ZR1 Join Date: May 2006 Location: Canada Posts: 139	Re: Secondary relay module questions The secondary injector modules were used for all years. However, the 90 model had a seperate knock module that was later integrated with the ECM. When I had a custom harness made for my 94 LT5 to allow it to run in a 65 coupe the company eliminated the modules and used a relay. They said it would work fine. This appears to make sense since the modules seem to be just an on/off switch. The pulse of the secondary injector is still controlled by the primary injector ground circuit though the ECM. I wasnt confident enough to try this route since I thought the general must have used a more expensive module for some reason. I guess when we cant find any then someone will give it a shot!

08-02-2008	#8
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,137	Re: Secondary relay module questions It is the 9 slot that messes it up for the eDIST. but I know the eDIST would work using the ECM timing.. meanign the ECM timing out would feed the eDIST. Also Paul, remember, the ignition module fires the 2 plugs, with a new set up, you would have a different ignition so the 2 fires per plug is a non-issue. I will look into it, I am not sure exactly what would work though. I would need to look into it a bit more, maybe this winter __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

08-02-2008	#9
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,669	Re: Secondary relay module questions =Jeff=, We may want to check with RBob and Jeremy.