Supercharger fuel system

[Blown3000]

I think it is time that I make the move from the FMU and WMI to a fully injected fuel system. Like to get some suggestions for ways to tackle this upgrade. Would really appreciate hearing from supercharged folks if there are any out there.

[IPD]

I think it is time that I make the move from the FMU and WMI to a fully injected fuel system. Like to get some suggestions for ways to tackle this upgrade. Would really appreciate hearing from supercharged folks if there are any out there.

exactly why should the fuel-system upgrades for a supercharged car be any different from those on a turbocharged car?

[ibsorgn]

exactly why should the fuel-system upgrades for a supercharged car be any different from those on a turbocharged car?

Don't think the man is claiming its different.

Blown, still using the NA ECU and injectors?

[IPD]

Don't think the man is claiming its different.

Blown, still using the NA ECU and injectors?

then why is he asking from "the supercharged folks out there"? for that matter, is the search function broken? i'm pretty sure that -6an has been established as sufficient upgrade for about 90% of the platform (not counting some ethanol users). parallel feed. stock feed line as return.

[ibsorgn]

then why is he asking from "the supercharged folks out there"? for that matter, is the search function broken? i'm pretty sure that -6an has been established as sufficient upgrade for about 90% of the platform (not counting some ethanol users). parallel feed. stock feed line as return.

I image he asks to scare up people like me. What are you sometype of self appointed gate keeper? Is there some unwritten rules to this forum that forbids someone from asking a question? Do you just assume that folks don't do searches?

Hope this forum is still run for the purposes of free and open discussion!

[IPD]

I image he asks to scare up people like me. What are you sometype of self appointed gate keeper? Is there some unwritten rules to this forum that forbids someone from asking a question? Do you just assume that folks don't do searches?

Hope this forum is still run for the purposes of free and open discussion!

not at all. but i am aware of OP's previous posts & relative hostility towards the tt-crowd.

[Blown3000]

Don't think the man is claiming its different.

Blown, still using the NA ECU and injectors?

Sorry, I missed your question. Yes I'm still running the stock ECU and injectors, in fact the whole fuel system is stock except for the FMU.

[ibsorgn]

I think it is time that I make the move from the FMU and WMI to a fully injected fuel system. Like to get some suggestions for ways to tackle this upgrade. Would really appreciate hearing from supercharged folks if there are any out there.

Blown, If you are running over 5 - 6 pounds of boost with the FMU (do you know the FMU's ratio?) you are probably, close to or are, maxing out the fuel pressure to the injectors which sooner or later will cause the injectors to fail or at a minimum not work properly. I ran with an 12- 1 FMU and WAI for about a year before I changed over and didn't experience any problems that I noticed. Feeding the motor without relying on high fuel pressures and WMI is the correct solution.

[Blown3000]

Blown, If you are running over 5 - 6 pounds of boost with the FMU (do you know the FMU's ratio?) you are probably, close to or are, maxing out the fuel pressure to the injectors which sooner or later will cause the injectors to fail or at a minimum not work properly. I ran with an 12- 1 FMU and WAI for about a year before I changed over and didn't experience any problems that I noticed. Feeding the motor without relying on high fuel pressures and WMI is the correct solution.

A long time ago I read a post from a guy that installed 2 injectors in his intake manifold and would inject fuel above a certain rpm or boost level, I can't remember which nor how he triggered it. I think he was running a centrifugal supercharger. Seems like that could be a solution and a rather inexpensive one at that. Oh, my FMU is blue and I think that is a 10- 1.

[ibsorgn]

A long time ago I read a post from a guy that installed 2 injectors in his intake manifold and would inject fuel above a certain rpm or boost level, I can't remember which nor how he triggered it. I think he was running a centrifugal supercharger. Seems like that could be a solution and a rather inexpensive one at that. Oh, my FMU is blue and I think that is a 10- 1.

I believe the guy you were referring to was in Europe or England but I do remember reading and seeing a few pixs of his set up. Thought it was quite novel and I believe that he trigger the injectors with his SAFC when a certain rpm was reached. The only drawback is that it is a on or off injection like your WMI and not a measured injection like what is controlled by your ECU. Beau_Jester (I think that's his handle in 3SI) told me that he wired in TT injectors but still controls the fuel system with his NA ECU and the help of a SAFC. I don't know whether he still uses a FMU as the NA ECU has no reference for boost. I think he seemed satisfied with his setup but you might try reaching him. Have you made any fuel system changes?