New FAST EFI system

[TopEndeR]

Originally Posted by DJW32

A tech over at fast said that the EZ Fast system will not work with boost.

Not what I wanted to hear

[Mick Mc]

Is that ANY boost?
Blow thru, draw thru...
Maybe there is no reference for boost...


Mick

[Jr]

I asked about the weiand and magnacharger.

[speedshopmike]

the new system uses alpha-N strategy.
it can not read boost (or vacuum)
it chases a targeted air/fuel ratio via wideband o2 sensor.

the new PP system looks an *awful* lot like retrotek's system...i suspect they're collaborating on producing it.

[sacarguy]

Originally Posted by mazspeed

I'm curious if that will work with a blown application.

it wont work because this system uses a wide band to shoot for a set air fuel ratio target and then the computer continualy adjusts the numbers in the fuel table vs map ..

problem is thats no where near fast enough for blown aplications. and there is no boost reference to know what to do with the timing it simply is timing vs rpm just like a old fasioned ditributor

[mrg]

Is this system available yet? Has anybody had a chance to try it out?

[tones2SS]

So, bear with me here guys, if someone has a carbuerted engine, they can convert with their system with the handheld device, swapping out some componets, such as the throttle body, fuel rails and such, and make it fuel injected?
WOW!!! Pretty impressive!

[Mkelcy]

Originally Posted by tones2SS

So, bear with me here guys, if someone has a carbuerted engine, they can convert with their system with the handheld device, swapping out some componets, such as the throttle body, fuel rails and such, and make it fuel injected?
WOW!!! Pretty impressive!

Except that you are still asking wet fuel to make it through the intake manifold evenly to eight cylinders with different length and configuration intake runner paths. The advantage of multiport fuel injection is that the only thing going through the intake manifold is air, with the fuel being injected right above the intake valve. If you're really looking for the advantages of EFI, I think multiport is still the way to go.

You also need to do a certain amount of plumbing and fuel tank modifications (EFI engines don't like interruptions in fuel supply).

I'm a big fan of EFI (have it on my SBC), but think that some of the "shortcuts" may compromise a little too much for not a big monetary savings.

Now a true self tuning multiport system? I'm all over that!

[tones2SS]

Originally Posted by Mkelcy

Except that you are still asking wet fuel to make it through the intake manifold evenly to eight cylinders with different length and configuration intake runner paths. The advantage of multiport fuel injection is that the only thing going through the intake manifold is air, with the fuel being injected right above the intake valve. If you're really looking for the advantages of EFI, I think multiport is still the way to go.

You also need to do a certain amount of plumbing and fuel tank modifications (EFI engines don't like interruptions in fuel supply).

I'm a big fan of EFI (have it on my SBC), but think that some of the "shortcuts" may compromise a little too much for not a big monetary savings.

Now a true self tuning multiport system? I'm all over that!

I guess my next question would be, would it still run properly with the "switch-over"? Sounds like you said about the EFI not liking the interruptions in fuel supply. Thanks for the info!!!

[Mkelcy]

Originally Posted by tones2SS

I guess my next question would be, would it still run properly with the "switch-over"? Sounds like you said about the EFI not liking the interruptions in fuel supply. Thanks for the info!!!

EFI systems require much higher fuel pressures than carbs. LT1's (and the Holley Commander 950 that I use) like about 44 lbs, factory LSx's are up in the low 60's. In an EFI system, there's no fuel bowl as there is with a carb, so any interruption in fuel pressure is immediately felt in fuel starvation to the engine. Becuase they have the fuel bowl, carbed systems can tolerate the fuel supply pickup momentarily sucking air in a low fuel conditions, not so much with an EFI system. As a result, fuel tanks intended for EFI applications are at a minimum sumped, and should also be baffled to keep fuel around the fuel pickup at all times. In addition, because electric fuel pumps are noisy, most fuel tanks intended for EFI also have internal fuel pumps.

The best deal I've seen on a sumped, pumped EFI fuel tank is the Spectra tank: http://www.rockauto.com/catalog/cata...MIUM%2BGM32AFI. Although it's not specified, my guess (and that's all it is) is that the pump in this tank is of the 44 lb. variety.

I don't know if I answered your question.