Just saw this video posted....

http://www.hotrod.com/multimedia/hot_rod_videos/6223371/part-i-fast-e-z-efi-fuel-system-installation/index.html

Thank you for posting the FAST-EZ EFI install vid!

Anyone use one? I've had my hands on one, curious if anyone else has.

Anyone use one? I've had my hands on one, curious if anyone else has.


Doug there are some over at team camaro that have used it,



http://www.camaros.net/forums/showthread.php?t=157848

Part II http://www.hotrod.com/multimedia/03/hot_rod_videos/6223368/index.html

Part III http://www.hotrod.com/multimedia/03/hot_rod_videos/6223368/

Interesting perspective.. not sure i buy it though.

My biggest concern is how this scales with or is compatible with power adders (i.e. centrifugal SC, small roots, ect.)

My biggest concern is how this scales with or is compatible with power adders (i.e. centrifugal SC, small roots, ect.)

not designed for forced induction

Jody

"not designed for..."?

That may be a bit incomplete as an answer...

When moving a speed/density EFI system from NA to boosted application you first have to change the MAP sensor. The MAP sensor can only vary from 0-5V, so NA applications use a 0-1 atmosphere (0 - ~14.7 PSI) sensor for maximum resolution. On a boosted application you will need a 0-2 or 0-3 atmosphere MAP sensor depending on amount of boost.

From there it is mainly a matter of calibration changes and fuel system (have to be able to provide enough from tank to and through injectors).

Until you get up into very high levels of boost where you start needing more ignition drive for the high pressures. The other factor can be the range of fueling... once you get a big enough injector for max power the pulse width can get too small and hard to control at idle.

I have seen a FAST system used on a blown alchohol burning BBC destined for Bonneville. They can be used on forced induction.

<edit --> Ooops, missed that this was the EZ do it all for you version of Fast :clonk: Jason has the full version so I assumed full version.

So with that perspective change... when companies try to simplify EFI the first thing that goes out the window is flexibility and tuning capability. May not be able to just change a MAP sensor on this system and once you do the system may well not adjust correctly. The programming will be setup to handle a generic NA SBC decently but everything off that center will be a bit less optimal.

"not designed for..."?

That may be a bit incomplete as an answer...

When moving a speed/density EFI system from NA to boosted application you first have to change the MAP sensor. The MAP sensor can only vary from 0-5V, so NA applications use a 0-1 atmosphere (0 - ~14.7 PSI) sensor for maximum resolution. On a boosted application you will need a 0-2 or 0-3 atmosphere MAP sensor depending on amount of boost.

From there it is mainly a matter of calibration changes and fuel system (have to be able to provide enough from tank to and through injectors).

Until you get up into very high levels of boost where you start needing more ignition drive for the high pressures. The other factor can be the range of fueling... once you get a big enough injector for max power the pulse width can get too small and hard to control at idle.

I have seen a FAST system used on a blown alchohol burning BBC destined for Bonneville. They can be used on forced induction

you didn't see a Fast EZ Efi system on a blown alcohol BBC.......;) You do understand the difference between this system and the older FAST and now XFI systems, right?

This cannot be used on forced induction because it cannot run a 2 or 3 bar map sensor, which would be needed to read boost. The firmware in the box cannot work with anything over 100 kpa, so no boost with this unit.

I see you edited yours while I was posting. I figured you missed the "ez-efi" part, you obviously know efi.......... :thumbsup:

Jody

but on a roots blower it just might work as the throttle body etc.. are top and not under boost. ? right?

The new Holley Avenger TBI system is very nice with alot of features including spark control - check it out.