I have a 1992 Vw Cabriolet that im carb swapping because the wiring harness is melted. The car was given to me so im its last chance. Its a a Digifant 2 car and i need spark. I have gathered info here but need to sort out some thoughts...
IGNITION
1. The Digifant ignition setup cant be wired with just a icm like i found diagrams for on the "running a 6al and no stock stuff thread" can it?
2. I believe 2 of the wires going to the icm go to the ecu on digifant so i would need a cis car harness if i wanted to run just a icm to get spark.
3. On the "running a 6al and no stock stuff thread" it shows a diagram for wiring a 6al in conjunction with a Daytona timing system TCS-1 and icm. "Why cant i wire a 6al-2 with a cis icm and use my Digifant distributor. From what i have found the 6al-2 works with haul effect distributors and has adjustments for timing on the box. Would this setup work "MSD 6AL-2, ICM, STOCK DIGIFANT 2 DISTRIBUTOR THAT CAME IN THE CAR" I would like to run a points distributor green wire only but im not sure if i can and i cant find one online.
FUEL
So can i run my transfer pump thats in my tank and delete the high pressure pump under the car and regulate pressure under the hood with a FPR with a retun line?
i feel like this would be a clean looking way to do it. if i have a pump in the tank why do i need to put a inline pump also it seems redundant. would this setup work"STOCK IN TANK TRANSFER PUMP, SOLID PRESSURE AND RETURN LINE FROM TANK TO FIREWALL WITH NO UNDER CAR PUMP, FUEL PRESSURE LINE INTO REGULATOR, BYPASS PORT ON REGULATOR BACK TO THE RETURN LINE"?
So far i have a VW 055129713K intake with a carb adapter and a holley 2 barrel. i paid 150 cash for the carb and manifold,
I received Techtonics tuning injector plugs today instead of the change and silicone. Thanks for reading any input would be appreciated!
If you only run a stock distributor and icm, you end up with locked timing. The "easy" button for you would likely be to swap in a cis 8v distributor that has the mechanical/vac advance. The other option would be to to run some sort of timing computer (cis-e knock box, aftermarket like a megasquirt or other programmable option).
Why do you need the MSD? You just need the ICM and distributor from a CIS car without a knockbox. DO a google search. You will find the wiring diagram with literally 6 wires to get your car running If you really want to run a points ignition setup like I did you need a points ignition coil too. The points coil has a built in resistor to keep the points from burning out. I got mine from BusDepot.com. I cant remember what year but many of the buses uses points. . Also I ran a 2bbL carb on my 92 cabby. It need 8psi of pressure at all times. Run the stock fuel pumps with the a holly by-pass fuel regulator. The holley regulator is set to 8psi from the factory.
Just some cool fuel info that might be useful for a carb swap...
Digifant two in tank pump produces 300 ml in ten seconds, thats 30ml per second.
30ml per second = 28.53 gallons per hour (GPH)
MR GASKET 42S= 2-3.5 PSI and 28(GPH)
MR GASKET 12S= 4-7 PSI and 35 (GPH)
HOLLEY 12-426= 1.5-4 PSI and 25 (GPH)
HOLLEY 12-427= 4-7 PSI and 35 (GPH)
I have noticed people delete the high pressure pump and replace it with one of the above listed in line fuel pumps.
Maybe there is something that i don't realize but it seems to me that the cleanest way to accomplish 3 to 4 psi for a webber swap would be to run the in tank pump and
bypass the high pressure pump and use a wix 33041 under the hood to supply fuel return.
The wix 33041 has additional return outlet that should prevent vapor lock.
I found a post about this filter and setup claiming that it provides 3.5 to 4 psi and needed to verify as best as i could before trying it. I hope this clears up any questions one would ask themselves before taking the plunge!
In theory i don't believe you would need a fuel pressure regulator.
there is no fuel reservoir attached to the in-tank pump though. would be better with a mk3 tank and pump reservoir fitted with a mk2 in-tank lift pump:thumbup:
intresting, what would my advantages be and why wouldn't the stock 93 cabriolet tank setup be as good? Also what mk3 tank would fit into a cabriolet? Would the pump access hole in the cabriolet be large enough to remove the pump with the mk3 tank in the car? Or would you need to drop the tank to service the pump after a mk3 tank swap? I'm Interested in what you have to say. What is the pump reservoirs purpose as far as how it would be better.
Ez wiring harness showed in the mail today so if I'm using a diffrent pump I gotta figure this out haha. Going to re pin connectors rather than cut and splice connectors pigtail style.
you need the reservoir in the tank (if your deleting the main pump/reservoir) to keep a certain amount of fuel at the pump inlet during steep climbs/descents on hills or during long cornering. more likely for the pump to run dry if your level goes below about 1/4 tank. you could even make up a small reservoir to fit the original tank pump. an old food tin with the right amount/size of holes drilled in it
you are right enough, but you need to bear in mind that the main pump has a reservoir which maintains enough fuel to keep the engine fed. I suppose either way you look at it, the in tank pump could run dry occasionally for a few seconds, but it wouldn't show up at the engine due to the reservoir/main pump under the car. a fuel pump running dry for any amount of time is never a good thing though. if you live in a relatively flat part of your country and you keep your fuel level above 1/4 tank at all times, it will probably work fine for you as is:thumbup:
I believe mk3 tank and pump would require dropping the tank to service it. I HAVE NO EXPERIENCE WITH THIS MOD. just a gut feeling
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Ask a question
Ask a question
VW Vortex - Volkswagen Forum
84.4M posts
1.5M members
Since 2001
A forum community dedicated to all Volkswagen owners and enthusiasts. Come join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new releases, and more!