12a carby to s4 13b EFI to 13b carby
12-30-14, 03:51 PM
#1
12a carby to s4 13b EFI to 13b carby
Hey guys I figure id post here to see if anyone has done this before.
My car is an 85 GSL. It was originally a 12a carbed car. The previous owner swapped it to s4 13B EFI. I ended up going a different route and I'm using a 4 port TII motor with a Holley 650. I'm going to use DLIDFIS with transistor trick.
Now obviously I do not have the 12a emission control unit, it was scrapped when the original swap was done and the harness was customized to do the 13b swap.
How should I proceed to run everything that requires the ECU. I have basically 0 emission control devices. I was thinking to leave the s4 n327 ECU in the car and just snip all the EFI and emission control stuff to run the FC coils (for DLIDFIS).
Fuel pump is wired directly to power with a relay and my own fuel cut switch.
Or what would you guys do? What have you done?
My car is an 85 GSL. It was originally a 12a carbed car. The previous owner swapped it to s4 13B EFI. I ended up going a different route and I'm using a 4 port TII motor with a Holley 650. I'm going to use DLIDFIS with transistor trick.
Now obviously I do not have the 12a emission control unit, it was scrapped when the original swap was done and the harness was customized to do the 13b swap.
How should I proceed to run everything that requires the ECU. I have basically 0 emission control devices. I was thinking to leave the s4 n327 ECU in the car and just snip all the EFI and emission control stuff to run the FC coils (for DLIDFIS).
Fuel pump is wired directly to power with a relay and my own fuel cut switch.
Or what would you guys do? What have you done?
12-31-14, 12:21 AM
#3
You're trying to hook up what is called 2GCDFIS with the transistor trick, not DLIDFIS. DLIDFIS does not require a transitor trick to work.
Hmm, you sound very confused, and I'm confused just reading you post. So, do you not have a 1st gen dizzy? Are you trying to get the stock FC CAS to work? My advice: if going carbed on your FC engine swapped into a 1st gen, get yourself a dizzy and then look into 2GCDFIS with a transistor trick and the FC leading coil, or DLIDFIS with stock 1st gen coils and stock or aftermarket ignitors. You don't need anything fancy because the Holley doesn't require a super hot spark like a turbo running high boost or difficult to ignite exotic fuels. There is also a big red box (MSD) but that's CDI which is also not really needed unless the inductive spark just isn't enough for your setup, which I'm sure won't be the case unless your Holley isn't tuned anywhere near ideal. And then you have a carb tuning issue, not an ignition issue.
Hmm, you sound very confused, and I'm confused just reading you post. So, do you not have a 1st gen dizzy? Are you trying to get the stock FC CAS to work? My advice: if going carbed on your FC engine swapped into a 1st gen, get yourself a dizzy and then look into 2GCDFIS with a transistor trick and the FC leading coil, or DLIDFIS with stock 1st gen coils and stock or aftermarket ignitors. You don't need anything fancy because the Holley doesn't require a super hot spark like a turbo running high boost or difficult to ignite exotic fuels. There is also a big red box (MSD) but that's CDI which is also not really needed unless the inductive spark just isn't enough for your setup, which I'm sure won't be the case unless your Holley isn't tuned anywhere near ideal. And then you have a carb tuning issue, not an ignition issue.
12-31-14, 09:48 AM
#4
I used the wrong term yes I'm running 2GCDFIS with TT and FC leading coil. Aftermarket trailing coil, stock FB dizzy with ignitors.
My questions would have been related to the wiring but I answered my own question and realized I need to study the wiring diagrams of both models.
My questions would have been related to the wiring but I answered my own question and realized I need to study the wiring diagrams of both models.
12-31-14, 02:25 PM
#5
I was trying to figure out where the ignition and alternator wiring went but I figured it out and got them hooked up.
I have some wires bundled with the engine harness I need to make sure I can seperate them from the harness and get rid of the whole s4 efi harness.
I have some wires bundled with the engine harness I need to make sure I can seperate them from the harness and get rid of the whole s4 efi harness.
12-31-14, 03:26 PM
#6
The wires you need to keep are the for the alt, coolant temp for dash gauge, oil pressure for dash gauge, two oil pan sensor wires if you need them, and the wire for the float bowl vent solenoid if your holley has an electric choke. Maybe keep the two wires that go to the water pump temp sensor which goes to the electric choke **** in the dash.
I can't think of any other wires in the stock harness. Some are repeats such as the black with white stripe which goes to one of the alt terminals in the T shaped connector (the other goes to the idiot lights). This black with white strip wire also hooks to the float bowl vent solenoid. It is on whenever the ingition switch is on. If you follow the harness back a ways you'll find several of these wires branching out to go to various rats nest connectors.
As for the S4 NA harness, I installed one in an 84 GSL and had to de-pin the unneeded wires, then run it alongside the stock 84 GSL wires through the large hole in the firewall. It was a big job to do it right. So I do have some experience with what you're trying to do. As for setup, I'm not sure what the PO did, but you should be able to get rid of the S4 ECU under the carpet and its three harnesses. AS for the stock GSL harness or just those few wires I mentioned, if they were cut and removed by the PO, I'm not sure what you're going to do. Maybe get some aftermarket gauges or something?
By the way, I think the ignition harness in the 84-85 cars is still on the driver's side, but I could be wrong. I swapped to the FC coil "packs" with ignitors and ran the wires across the engine bay and I think I poiwered them with he existing FB power wires (thick black with wite stripe from the stock coils - notice a theme here?). Sop for you to go to 2GCDFIS, it should be pretty straight forward, but if it was my car, I'd do DLIDFIS. Heck I did install DLIDFIS in an 85 GS and an 84 GSL-SE kinda recently too, so I know it works fine with both types of harnesses (The GSL-SE has some of those dash gauge wires in the driver's side harness making more room for just the EFI and emission harness coming through the passenger's wire harness hole).
I'm typing this up from memory. If any of it is confusing maybe someone else can help.
I can't think of any other wires in the stock harness. Some are repeats such as the black with white stripe which goes to one of the alt terminals in the T shaped connector (the other goes to the idiot lights). This black with white strip wire also hooks to the float bowl vent solenoid. It is on whenever the ingition switch is on. If you follow the harness back a ways you'll find several of these wires branching out to go to various rats nest connectors.
As for the S4 NA harness, I installed one in an 84 GSL and had to de-pin the unneeded wires, then run it alongside the stock 84 GSL wires through the large hole in the firewall. It was a big job to do it right. So I do have some experience with what you're trying to do. As for setup, I'm not sure what the PO did, but you should be able to get rid of the S4 ECU under the carpet and its three harnesses. AS for the stock GSL harness or just those few wires I mentioned, if they were cut and removed by the PO, I'm not sure what you're going to do. Maybe get some aftermarket gauges or something?
By the way, I think the ignition harness in the 84-85 cars is still on the driver's side, but I could be wrong. I swapped to the FC coil "packs" with ignitors and ran the wires across the engine bay and I think I poiwered them with he existing FB power wires (thick black with wite stripe from the stock coils - notice a theme here?). Sop for you to go to 2GCDFIS, it should be pretty straight forward, but if it was my car, I'd do DLIDFIS. Heck I did install DLIDFIS in an 85 GS and an 84 GSL-SE kinda recently too, so I know it works fine with both types of harnesses (The GSL-SE has some of those dash gauge wires in the driver's side harness making more room for just the EFI and emission harness coming through the passenger's wire harness hole).
I'm typing this up from memory. If any of it is confusing maybe someone else can help.
12-31-14, 04:53 PM
#7
The wiring was already done by the PO. Its a mix of the GSL harness and the s4 NA harness. I keep finding mistakes and improper connections..I almost want to rip it all out and start a new but thats a project for another day.
I wont be using the factory gauges as I have all autometer ones. And my Holley is a manual choke.
I did figure out the alternator and ignition wiring, it is on the drivers side on this car. And I wired up the 2GCDFIS. I figured since I had the parts already I would install it..I don't have the parts for DLIDFIS, maybe a future project.
Thanks for the help.
I wont be using the factory gauges as I have all autometer ones. And my Holley is a manual choke.
I did figure out the alternator and ignition wiring, it is on the drivers side on this car. And I wired up the 2GCDFIS. I figured since I had the parts already I would install it..I don't have the parts for DLIDFIS, maybe a future project.
Thanks for the help.
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