Best EFI System for BB Chevy

[ProdigyCustoms]

Originally Posted by Matt H.

i talked to someone at prodigy and they said it was mainly for 800-900+ hp engines and mines gonna be around 520.

I do not want the facts confused, I am sure you are just generalizing to keep the answer short. What I said was your combo is mellow and the Holley should work just fine on a mild combo IF you have a tuner that knows the system. The FAST is a better choice if the motor has Big stupid cams (Like Project Prodigy) or forced induction where advanced tuning capabilities are required. Horsepower has nothing to do with the decision.

The FAST may be overkill for you project, but this is a community FULL of overkill, LOL!

[Matt H.]

ya i just shortened what you said. i have someone who can tune both the holley and the edelbrock systems so its between those 2. Ando although i overkill on a lot of things, the FAST system is very expensive and i think its really more than i need

[PRRC]

Matt, Not sure if you've made up your mind yet.But We would sure like to give you a price on either system.I think we could save you a few bucks. Thanks Tim / Paradise Road rod & custom

[Z-man]

IMO - the Holley is a great system and would be an excellent choice. Of course, I'm running one. I also use a wide band O2 sensor. I'd recommend one if you go EFI...

[Slow Ride]

What about megasquirt for us poor bastards? How cheaply could you put one together for a big block with the possibility of adding a turbo or 2???

[Fracture Critical]

neat thread!

ok, here's what I know for sure, some of what I've figured out over the years, and some stuff I'm just guessing at:

if you're going to go to EFI, which is a big ticket item, then do it right and get a proper manifold. the TBI systems out there, even the multi port systems out there are not ideal for EFI. those systems are based on manifolds for carbs, so they're designed to take the intake air charge when it's wet with fuel, and get it to the intake ports as expediently as possible without causing the fuel to precipitate out of the air charge on the way there. by going to EFI that uses a manifold like this, you're basically looking at just increasing the efficiency of the engine and eliminating the carb.

auto designers realized that by going to a port injected configuration, they were released from the need to design manifolds that had to be able to keep the fuel suspended in the air charge. the air charge was now 'dry', and by using long runners, the air charge could be accellerated at lower rpm and 'ram' the air into the heads via the air's own inertia. furthermore, a large plenum helped act as a reservior for the runners, no matter the throttle position, and that helped the area under the torque curved, as well. any modern fuel injected engine will use this type of manifold. if you ever get the chance to look at a Taurus SHO motor, it is a piece of art in this respect. it actually has two set of runners to each cylinder. a long runner for low end torque and a short runner for full throttle blast.

wiht that said, the best way to get the bang for your buck out of EFI is to find a dedicated EFI manifold for your engine. if you can't do that, then the next best thing is to have someone like Hogan's build you a manifold for your application, but that's a $3k expenditure. (ouch)

lastly, I don't want to hear anyone bashing megasqurt until you read the megamanual. it's really the best bang for the buck out there, assuming you are willing and interested to learn EVERYTHING about EFI. if you're a plug-and-play guy, it's probably not for you.

oh, HI by the way! I' ma new guy here

[BB69]

I was reading through the older threads, and saw this one. I just completed putting fuel injection on my big block Corvette earlier this year. I am still in the tuning stages, but thought I would post some pics and information. I used a port manifold and fuel rails from Holley.



The computer is a Megasquirt, and I am using it for fuel and ignition. The ignition is handled by the Ford EDIS distributorless ignition.







The throttle body comes from www.auto-nomics.com and is very reasonably priced. It was originally used for a fuel injection system that had the injectors under the throttle blades. However, Auto Nomics sells machined plugs that allows it to be used as a throttle body only. I also bought the wiring harness and fuel pump from Auto Nomics.

The system works better than I could have hoped for. So far, I have only had a few problems. 1. I think I screwed up when installing the new intake manifold gasket as I am getting smoke from the exhaust and fouled plugs. I will be replacing the manifold gaskets this coming week. 2. I bought a wideband O2 sensor from Innovate. It stopped working during the initial setup. Innovate fixed it under warranty no questions asked and it now works fine. 3. My old laptop with a serial port finally died, so I had to buy a USB-serial adaptor for the new computer. The adaptor works well, but it did cause Megasquirt to lockup once. There is a published fix for this.

As I said, I am still tuning (which is hampered by the oil leak) but I have run one track day in addition to my street driving with no fuel injection related problems. I am also using the extra output of Megasquirt to control my electric fans. I can turn the fans on and off at any temp, and I can also combine this with engine RPM (or any of a bunch of other factors) so the fans don't come on when the engine is cranking.

Ken

[kennyd]

we are using FAST XFI on a few cars in our shop . i really like the system so far , we are having some set-up and programming problems , like cold start , and timming set up while cranking , but this system will allow adjustment to your needs .
the system has so many functions that you can eliminate in the start , AFTER that you can wire a complete XFI in less that 6 hrs . the wiring harness that we use is a standard cut to fit harness , so you can shrink wrap each sensor or bundle instead of using the split loom that they send .

if i have any problems with FAST it is that they need a better viedo to watch and learn what screen controlls what . they go thru the viedo like you have been using XFI for years .

[rocketman]

I've had FAST on 2 car's it's a great set-up.

[andrewmp6]

id talk to http://www.mass-floefi.com/ or http://www.retrotekspeed.com/