BigAl1

Yep, it does. Toofast(?) mentioned this in the past, that it could cause the spray pattern to hit the wall of the runner nearest the path - he called it "wall-wetting" I think. Unknown if this will be a significant issue for this setup. I have seen some strange Audi electronic injectors with an extended tip length, but figured they will be hard to find or expensive. One slightly good thing about this is the farther the spray tip is from the valve, the more time the fuel has to mix with the air.
Jeremy, I found those too. When I was done with my creations, I realized the same as what you said! Oh well, for $6 of material and some of my time, it was a good day.

U-928

Megasquirt calls the "pooling" of fuel on the walls of the intake tract 'tau' (IIRC, it's been a while since I've tuned my car), and has ways to compensate for it.

Al, the injectors you speak of are not all that expensive, especially since many 1.8T VW owners ditch them in a hot minute when they upgrade turbo's/intakes etc. I have a few (read 4) sets of them, problem I think you may have also found is that the flow ratings could have not been what you were after.

What flow injectors are you using? I'll dig a couple sets of them out of my box at work and snap a couple pictures showing the differences in the snouts.

atb

How do the VW injector cups anchor the injector? Is it just a friction fit of the round pintle cap inside the hexagon port?

Fabio421

Yes, Thats what I thought. I believe the CIS runners can be machined to work but there was alot more to it than I was willing to do at this point. Maybe that will be a later project. Please keep this thread updated as you progress. I am really enjoying it so far.


Hi. This is a little different from "wall wetting" since it's not wetting anything in the flow path of the incoming air. The injector tip will be recessed by about an inch up inside a small diameter hole in the runner casting. It may work fine in some applications. I am using 60lb injectors in my build and I think I need the fuel to be as atomized as possible in order to get a decent idle quality. Time will tell.

hacker-pschorr

High or low impedance?

BigAl1

Jeremy,
I have Ford #24 injectors currently, but have been researching the Bosch 0 280 155 897 from the 2001 Jetta - the ones with the extended tip (EV12) look like a good match for geometry, and 12ohm, but #30 flow rate which is high for me as NA. Still looking.... Any flow rate between 240-280cc will be acceptable to me. http://www.bosch-motorsport.de/en-US...6748841227.pdf

Fabio421

High. If you use low imp. injectors w/ the Megasquirt you have to add resistors to the circuit.

Lizard928

Fabio,

I am using 60# siemens inj in my car in stock S4 location, idle quality is 100% fine.

BC

There are high impedance injectors that go up to 200lb

Injector dynamics

hacker-pschorr

Ok, just asking because it's generally easier to get a car to idle and cruise with large injectors when they are low impedance / peak & hold type.

U-928

Ah, I read to fast originally, I know what you're talking about now.

I also run much larger injectors then I need to in my squirted car, and even without some idle stabilization device, I have a steady reliable idle. Only time it gets fussy is when it's sub-30*F weather, which the car never sees anyways.

hacker-pschorr

Has anyone actually ran MS (any version) with the 100-1 tooth ring from the EuroS and 85/86 cars?
I know it's been discussed before but someone just PM'd me about it.

Fabio421

I was going to do it but decided not to because the EDIS won't work with that ring. In fact, I bought a lightweight flywheel and that toothed ring just for that reason. Actually, to clarify, I bought the 60-2 S4 toothed ring to do this becasue the 100-1 wheel isn't supported as far as I can tell.

Ducman82

i wat thinking id snag Carls 60 tooth alum wheel when i get to that point.

wildwestsydney

I am running a MSII fuel only on an 84 euro. I am getting my ignition signal for the MS box from the EZF.

I don't think this is what you were getting at but I figured I would toss it out there.


Sam