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Goodbye TBI--Hello FAST

Wyomingboy

Wyomingboy

1/2 ton status
Joined
Mar 7, 2008
Posts
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Location
Colorado Springs, Co
Getting rid of my fully modified, bored out, 80# injectors & vacuum fuel pressure regulator TBI for a FAST self adjusting injection system. Tired of trying to deal with Tuners who live in other states.
Hope to have it running in a month or so and be able to report how it does.

IMG00113-20110428-1518.jpg
 
Umhh, I am really bad with acronyms ! Does vfpr mean " vacuum fuel pressure regulator" ? If so I made it, as you can't buy them anymore. They are easy to make, you just weld a fitting to the steel spring bowl & seal up any holes. Then run a vacuum tube down to one of the vacuum ports. I " T'd " mine into the rear port that ran the MAP sensor. This way you can run an 18# spring and still have low fuel pressure idle & low speed drivability.
 
that ones on the back burner till the 383... I was pretty sure Turbo City made one.. but it isn't listed on their site... I'll probably get lazy and just buy it.. but if it isn't available, nice to know the homebrew works too..
 
ryoken said:
that ones on the back burner till the 383... I was pretty sure Turbo City made one.. but it isn't listed on their site... I'll probably get lazy and just buy it.. but if it isn't available, nice to know the homebrew works too..
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Turbo City did used to have a vacuum reference pressure regulator but they haven't sold those in years now, in fact they don't have hardly anything on their website for TBI stuff anymore. I bought my IAC adapter wiring harness from them and that isn't there any longer either as is the "Salad bowl".
 
I guess that eghey one is one they found kicking around the shelves...
 
Sweet! I am doing the same thing myself right now, except I never had TBI. It'll be interesting to see another point of data! I love the quality of the FAST unit and how the high pressure injectors are down under the throttle plates instead of low pressure units well above the throttle plates.

Walbro makes a fuel pump that is a direct swap for your TBI in tank pump, it's in my build thread (post 147) if you want to see it. And those push lock fittings that come with the EZ-EFI master kit are a total PITA. I would rather use standard braided stuff.

One note, the little hose that comes with the walbro pump is NOT rated for in tank use. Found that out this weekend. Kind of ridiculous if you ask me they incude hose for an in tank pump that isn't supposed to be submerged, anyway, you can get the right hose at O'Reilly, its a $26 for a one foot package of it. Part # 27093.
 
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I looked at the FAST setup and it was cheaper to buy the equipment to burn chips. I'm completly setup to read and burn my own tbi chips for the 7747 ECM. It might not be as awesome as your setup but I like it. Watching your thread to see your results....
 
GMC Truck said:
I looked at the FAST setup and it was cheaper to buy the equipment to burn chips. I'm completly setup to read and burn my own tbi chips for the 7747 ECM. It might not be as awesome as your setup but I like it. Watching your thread to see your results....
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I don't really think the FAST setup and the standard GM TBI are comparable. Yeah, they are both throttle bodies, but that's about it. TBI is a low pressure 2 barrel with injectors outside the throttle body in the air cleaner. The FAST system uses high impedence high pressure 65 psi injectors UNDER the throttle plates more inside the intake, with a 1000 CFM 4 barrel throttle body minimum. Also, with the same EZ-EFI computer, you can also tell it you want 2 throttle bodies, or tell it any injector size, and any number of injectors (4 multiport intakes), or any number of cylinders (different engines), or fuel pressures, etc. With the right fuel system and injectors, you can support 200 hp or 1200 hp. The same computer does it all.

With that said, I think it's awesome you can burn your own chips, props to you for that. Not many people try to do their own tuning.

I started mine for the first time this weekend, and I drove it for the first time last night. So far I love it, lots if live data if you leave the handheld unit hooked up (not necessary). Can change A/F ratio on the fly if you want while monitoring all the parameters. So far so good.

By the way, I love your sig line! :haha:
 
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I think your right that the FAST and a GM system is apples to oranges. But since all my time has been with GM stuff I'm kind of stuck here, but this FAST suposedly self tuning is nothing new. All GM systems self tune. But the paremeters are based on that engine. Seems like the FAST system has paremeters based on well built performance engines. Good luck! I am really interested in learning of this new system. :waytogo:
 
eagle mark said:
but this FAST suposedly self tuning is nothing new. All GM systems self tune. :waytogo:
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Yes, GM EFI does self tune, but it ONLY self tunes if everything is exactly the same as stock. The moment you start changing stuff the stock self tuning goes out the window and doesn't work worth a crap. Change heads, exhaust, or intakes, and all the sudden the stock computer is confused. And a cam or a different size engine (stroked for instance), forget about it.

But the FAST system builds it's own base maps while it tunes, so it can adapt to almost anything, cams, heads, intakes, even a 2.0L I4 or an 8.0L V8 and anything in between. But currently it is limited to NA engines, no boost, and timing is independent, so that reduces the variables it has to change.

So I respectfully disagree, I believe it is pretty new. :waytogo:
 
eagle mark said:
...but this FAST suposedly self tuning is nothing new. All GM systems self tune. But the paremeters are based on that engine. Seems like the FAST system has paremeters based on well built performance engines. Good luck! I am really interested in learning of this new system. :waytogo:
Click to expand...

The GM system does not self tune, but it does self correct via the integrator and BLM tables. The tune is programed in the. The BLM corrections are only capable of varying the tune to a small degree based on minor changes to environmental conditions and gas etc.
 
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