http://www.AtomicEFI.com/

New from MSD. Looks cool.

 

lol @ throttle body injection with no ignition control in 2011.

 

Annular booster discharge for injectors is different.

 

cost?

 

Barry grant vfi had that in 95 already

 

looks good

 

It has timing control.

 

how much is this unit ? it looks awesome

 

jegs is listing the base unit at $2000 and the master at $2300

 

4300 dollars?its cheaper to swap in an ls1 with aftermarket harness.i wish someone offered a control for a gm tbi like that with a wide ratio oxygen senser that would automaticly adjust for bigger cams or heads.

 

I think one of us misunderstood something.

 

You can buy an LS for 2300 too,

 

You mean like the one Holley has had on the market for two years?

 

and F.A.S.T.

 

The FAST EZ EFI does not control timing

 

Atomic does control timing and has some very cool innovations to it as well. I got a chance to go over it this week and the way they do the fuel rail in the throttle body is very good, the ecu is integrated to the side of the throttle body, incorporating the TPS in the circuit board too. It's also available as a returnless system so you don't have to run a fuel return line back to your tank. All in all it's a very interesting design. I'm a port injection guy myself but if I were doing a simple upgrade for my kids project I would have to look at this unit along with FAST's EZ EFI and Holley's Avenger too. It's an interesting time in the EFI business.

 

The Atomic EFI uses a pulse module for the fuel pump which is why it doesn't need a return line.

I'm sure the ignition controls are pretty good since it was made by MSD.

 

i know this, i have one. the EZ was designed with cost effctiveness in mind.

 

From what I saw, the timing is handled by a software logic model that essentially emulates a spring and weights distributor, with some minor retard built in for high temps. Seems like you can set the idle cruise, and total at WOT, but no spark maps.

It also has idle spark control to help control the engine speed. GM has used this feature since the 80's, so its not necessarily a new idea, but it does work.

The one thing thats a problem is that it is a wetflow system. This means that you have all the nuisances of a carb in cold weather. Things like poor fuel distribution, and hard to tame acceleration enrichment. Also means that the system absolutely depends on the WB O2 for good operation since its speed density. Wetflow systems and speed density dont always play nice since the fuel can drastically change the temperature of the incoming air charge.

 

Correct and as mentioned with any TBI you'll have the same inherent fuel distribution problem that you do with a carb.

Temp changes obviously effect performance/tuning as well. That's why there are really very few true VE based systems. FAST, Holley, Motec, and a bunch of others are really all pulse width based. They don't have that extra cal that correctly figures true VE.