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Thu May 15, 2025 8:30 am

Does anyone have any experience with this system that they could share..or observations/opinions based on their ad?

https://washburns-metal.myshopify.com/products/fis...volkswagen

Thu May 15, 2025 8:39 am

vamram wrote: Does anyone have any experience with this system that they could share..or observations/opinions based on their ad?

https://washburns-metal.myshopify.com/products/fis...volkswagen

Looks like just another version of an electronic carburetor. It will still have the same cold weather running issues as a carb, because of physics.

This one doesn't appear do any programmable timing control either. At least there is nothing for reading crank degrees, unless they are using the stock distributor for that? Not sure how they would alter the timing then?

Brian

Thu May 15, 2025 9:01 am

Looks like a Microsquirt in the pics.

Thu May 15, 2025 10:22 am

panel wrote: Looks like a Microsquirt in the pics.

It looks like it is based on a Microsquirt ECU.

Thu May 15, 2025 10:14 pm

This is the kit danny at split second in Santa Ana made

Fri May 16, 2025 5:32 am

Looking at the installation PDF, it looks like a 2nd return line is not installed as part of this kit...?

Fri May 16, 2025 7:26 am

https://splitsec.com/product/fis2-001-fuel-injection-system-type-1-vw

Fri May 16, 2025 5:21 pm

vamram wrote: Looking at the installation PDF, it looks like a 2nd return line is not installed as part of this kit...? In the pics from your first post there is a pic of the return line. Not sure what you mean by a 2nd return line.

https://washburns-metal.myshopify.com/cdn/shop/fil...1721510016

Mon May 19, 2025 8:54 am

panel wrote: vamram wrote: Looking at the installation PDF, it looks like a 2nd return line is not installed as part of this kit...? In the pics from your first post there is a pic of the return line. Not sure what you mean by a 2nd return line.

https://washburns-metal.myshopify.com/cdn/shop/fil...1721510016

Other than that picture, I didn't find a reference to a 2nd fuel line in the installation PDF. I spoke w/the maker and he confirmed that he uses a single line, no 2nd return fuel line from the engine bay to the tank.

https://splitsec.com/product/fis2-001-fuel-injection-system-type-1-vw

A little confusing to me to be honest. And pricey.

Mon May 19, 2025 12:23 pm

There is a return line in that link also. It's from the FPR and goes into the bottom of the tank right where main feed line to the filter > pump .

Sun May 25, 2025 10:26 am

panel wrote: There is a return line in that link also. It's from the FPR and goes into the bottom of the tank right where main feed line to the filter > pump .

So that looks they dead- head the feed to the injectors, teeing the pressure regulator off the pump rather than cooling the fuel lines past the injectors by putting the pressure regulator on the far end of the fuel rail.. Interesting to find out what happens when things get hot.

Tue May 27, 2025 3:50 am

Oh i actually have this system in my 74 super rn. i am just re-tuning the map.

Tue May 27, 2025 3:57 am

mikedjames wrote: panel wrote: There is a return line in that link also. It's from the FPR and goes into the bottom of the tank right where main feed line to the filter > pump .

So that looks they dead- head the feed to the injectors, teeing the pressure regulator off the pump rather than cooling the fuel lines past the injectors by putting the pressure regulator on the far end of the fuel rail.. Interesting to find out what happens when things get hot.

Same concept as an in-tank returnless pump such as those available from Holley for their EFI systems. I'm running one on my super right now and so far no issues.

Tue May 27, 2025 1:45 pm

Brian_e wrote: vamram wrote: Does anyone have any experience with this system that they could share..or observations/opinions based on their ad?

https://washburns-metal.myshopify.com/products/fis...volkswagen

Looks like just another version of an electronic carburetor.

uhhh.... aka throttle body/efi?

Tue May 27, 2025 2:28 pm

He means it will suffer from the same problem as any center-mounted carb. Namely dependency on manifold heat.

Max

Tue May 27, 2025 4:38 pm

I don't have a heater riser with this kit because icing doesn't occur with it. Icing typically happens at temperatures between 40°F and 60°F, but I rarely experience those conditions. Additionally, it requires humidity levels near or above 80%, which I also don't have. Furthermore, this TBI doesn't have a venturi and sprays a fine mist of gas, unless large droplets form from the carburetor, which can cause icing.

Wed May 28, 2025 1:11 am

Brian_e wrote: This one doesn't appear do any programmable timing control either. At least there is nothing for reading crank degrees, unless they are using the stock distributor for that? Not sure how they would alter the timing then?

The distributor gets locked so it doesn't advance. The kit uses the existing PerTronix Ignitor Ignition for timing. The red wire provides power, and the black wire is used for the trigger. The MicroSquirt system will use the trigger wire to fire the spark plug for advance. The distributor needs to be set at 12 degrees, and the ECU will handle the rest.

Wed May 28, 2025 5:37 am

I Hope I don't offend you with this post, that is not my intension. I am not singling you out sir! Education and myth busting is the intent.
AMS_Dizz wrote: I don't have a heater riser with this kit because icing doesn't occur with it. Icing typically happens at temperatures between 40°F and 60°F, but I rarely experience those conditions. Additionally, it requires humidity levels near or above 80%, which I also don't have. Furthermore, this TBI doesn't have a venturi and sprays a fine mist of gas, unless large droplets form from the carburetor, which can cause icing.
This right here is one of the biggest misunderstandings in the history of the infernal combustion engine. The intake manifold heat riser has absolutely nothing to do with carb icing! Never has and never will! The only thing that will prevent carb icing is heating the air BEFORE it gets to the carb! VW addressed that with the stovepipe system that took warm air off the cylinders and up to the air cleaner. Heat added after the carb never reaches the carb as long as the engine is still running! It's like trying to swim against the tide/current!

Case closed!

The sole purpose of the intake manifold heat riser is to prevent fuel drop out and pooling in the horizontal portion of the intake manifold. Fuel is lazy and the colder it is the lazier it wants to be. It has no intension of making the trip to the intake valve if it can help it. It would rather hang out on the walls and floor of the intake and go back to sleep (liquid form) than stay in a mist or a vapor. Heat and velocity are it's motivators. Anything above 90*F or about 1/3 to 1/2 throttle will keep it on the move.

This is the reason that any and all fuel systems that adds fuel BEFORE the horizontal portion of the intake manifold NEED a heat riser!

I hope this helps to dispel the confusion and misinformation!

Mon Jun 02, 2025 1:27 pm

Thanks for the detailed explanation your point about the heat riser preventing fuel dropout in the manifold horizontal sections rather than addressing carb icing is spot on.
I'm running a TBI system with an aftermarket Y-shaped manifold on my 1600in southern Arizona, where winters are mild (40-75F) and summers are hot (90-110 F+). With the stovepipe already installed and preheating intake air, I'm planning to rely on it year round instead of reinstalling the heat riser, which would require new exhaust gasket maker and a 24 hour cure time. The TBI finer fuel mist and the Y manifold smoother airflow should minimize dropout, especially in summer's heat and winter's mild temps. The stovepipe warm air should keep the mixture vaporized, even at low throttle in cooler winter mornings. Given Arizona warm climate and low humidity, do you think the stovepipe alone will be enough for both seasons, or would you recommend the heat riser for extra reliability in winter?

Mon Jun 02, 2025 1:51 pm

Depends on what you mean by winter.
If we are talking Canandian or Scandinavian winter, the ansswer is no.
Winter south of I40 mmmmhh. Probably yes.