Originally Posted by Vegas69 (Post 232589)

I'll stick with my bucket and poor gas mileage.:D I bet they come out with a bigger version if this becomes a success which it will. I'll let them work through any potential bugs in the coming months as well.

Originally Posted by gmorris (Post 232333)

LOL...could have at least read the title...

Originally Posted by Steve1968LS2 (Post 232571)

Ok.. we tested the EZ-EFI today..

Installation.. WAY easy.. all the sensors along with the fuel injectors are contained in the throttle body. The only external sensor is one for water temp and of course the O2 sensor.

The interface is very easy to use. Install the unit, start the car and let it get to the specified operating temp (around 180-degrees). When you are in that area you hit a button and voila! it starts tuning itself.

Oh, there is one section where you set your AF ratios at Idle, Cruise, and WOT. You can also set a rev limiter (cuts fuel).

Once you make changes it takes a while for the system to "learn" and turn itself. So if this was in a car you would want to set it then drive around for an hour before you could consider it educated (although it always learns).

It bases most of it's tuning on the O2 sensor but there is an IAT and MAP sensor. It does NOT change the timing.

Fast says it is good for 550 to 600 but we found that in our test it's good for up to 500 crank hp. It's not that it runs out of fuel but more that it runs out of air.

We tested the unit and then swapped it for a carb. A 1000 cfm carb made more while a 750 cfm (4150 Holley) made almost the exact same as the EZ-EFI.

The rest was great.. the engine fired right up like it was an LS engine and once it learned the settings it was as happy as could be. Install was a snap as was tuning. For the $$$ it's a great option for those with moderatly powered engines looking for EFI on a budget.

There will be a dyno story in Super Chevy and a car install story in Camaro Performers.

Let me know if you have any questions.

Originally Posted by ccracin (Post 232818)

Steve,

We have been talking to Casey Wegner about a 415ci LS motor with the EZ EFI on it. He said they have made 600+ with the system on an LS based engine. Any thoughts? Do you think it is the efficiency of the LS over the Big Block that is allowing it to do this?

Originally Posted by Steve1968LS2 (Post 232826)

Well, if you can make a given power level at a lower RPM then it will require less air.

Our test was on a 454 big block and it made less power with the EFI than it did with a larger (1000 or 950 CFM) carb. It was when we moved down to a 750 cfm carb that we got similar dyno numbers. It was down about 30 horsepower, not a hugh amount.

And yea, I think the efficiency of the LS helps. In our case the big-block made something like 502 hp and 535 tq.. on another engine, like an LS, it might make more. But, it can only move so much air. I need to ask FAST what CFM the throttle body is rated at. Going by the dyno data the fuel was fine, it (in our application) was just running out of air.

I would like to see your data and talk with you about the LS install. Email me at [email protected]

But the math says it can only support so much HP based on only having four injectors. Oh, our test was ran at a fuel pressure of 45 lbs.

Again, it's a great, easy to install system that covers a huge percentage of the engines out there, but if you are building an all out race engine you really need to step up to one of FASTs bigger systems.

Originally Posted by GregWeld (Post 232827)

Chad ---

Wegner has got to have some pretty good techs there... I'm thinking there are at least two mathematical issues here:

1: The flow rate of the injectors... you need "X" amount of fuel to support "X" amount of HP...

2: Air flow of the throttle body... again - "X" amount of cubic inches has to flow through this "restrictor" - no?

So I'm wondering -- since HP is only a mathematical equation based on TQ -- if the TQ number was good -- and the RPMS are through the roof - then maybe the actual math might be supported to make a bit more than their saying in their Ads?? They (they being FAST) most likely don't want to be responsible for guys going lean and wasting their brand new pride and joy...