Been looking at these "install in the morning, cruise at night" EFI set ups. The claims are that the installation is very simple. I don't know which way to go. I'm sure that I will get better gas mileage, but even greater would be the increased performance(I think). So,,,what is the general concensus on this. I am aware that it is EXPENSIVE, but I would like some input. Thanks.

I dont how the weather is in your area, but up here we have such a weather shift over the course of a cruising season that to me EFI is the way to go. Having it always adjusting to the proper mixture no matter the temp seems like a real bonus. Plus the fuel mileage increase would be nice to have.

Jeff

The FAST EZ EFI is very good. I went to one of the FAST classes and observed how quickly one of these systems automatically adapts the EFI to the engine.

Ron

If you are a little computer savvy, take a look at the MegaSuirt system.

www.diyautotune.com

Been looking at these "install in the morning, cruise at night" EFI set ups. The claims are that the installation is very simple. I don't know which way to go. I'm sure that I will get better gas mileage, but even greater would be the increased performance(I think). So,,,what is the general consensus on this. I am aware that it is EXPENSIVE, but I would like some input. Thanks.
some of it depends on your cars specs, and some depends on your $$$-budget priorities..
whether you can use the more economical systems or have to go with the high dollar set-ups.
you should get better mileage and starts and stop & go performance.
but if you only get say 3-miles per gallon better, then how long will it take before the EFI starts saving you money???
if it costs $xxxx.00 for the EFI=how many miles will you drive before the gas costs and the EFI are offsetting???

Sent ya a PM Mikey.

Exactly.Some people think when converting to EFI that there will be a major increase in mileage and power.If your car is setup properly with a carb the difference will not be that big.Don't get me wrong.I love EFI.I've been driving /racing EFI cars for over 20 years.As far as weather changes affecting how the car runs on the same day or even the same season is hard to believe.Back in the day we drove our 12 second BBC winter and summer with hardly any changes.Usually we just added snow tires and a hotter thermostat when it started to snow.
Just because you are spending money and making a major change,don't think things have to improve.
Now if you are doing a complete LS conversion.That's a whole new deal.25MPG and 800HP is NP.

some of it depends on your cars specs, and some depends on your $$$-budget priorities..
whether you can use the more economical systems or have to go with the high dollar set-ups.
you should get better mileage and starts and stop & go performance.
but if you only get say 3-miles per gallon better, then how long will it take before the EFI starts saving you money???
if it costs $xxxx.00 for the EFI=how many miles will you drive before the gas costs and the EFI are offsetting???

I converted from a carb and bought everything new from the tank forward to the FAST EZ EFI system. Lots of easy fabrication to do it right. While I have used EFI on several cars this is the first self learning one and the lack of tune-ability leaves something to be desired. That being said, the AEM systems that I used before were a hassle because I had someone who knew what they were doing tune it and each change required a new tune. The FAST system does what it is advertised to do and makes a huge difference in driveability. I like the new MSD system as the wire harness is smaller and the way the fuel is discharged looks to be more efficient. All said and done, it's worth the investment.

If you have a fuel return line already in the car then the Fast EZ EFI can be done in a day. If you don't have a MSD 6AL for a tach signal then best to get one. Its not 100% necessary but it does give you the best tach signal. Factor that into the install too. I found on my two installs that the most time consuming parts of the install are deciding where you want the wiring harness to go and the fuel plumbing. I also installed MSD 6AL's in both cars too with MSD Billet distbrutors. Once that's done then it's just install the throttle body(s) hook up the fuel and its plug and play. My Camaro, with a 470 hp 383 averages about 14 mpg bombing around town with a bit of highway mixed in. The best highway mileage I got was 24 mpg by leaning it out which is very easy to do with the hand held module. My dual quad tunnel ram set up on my 406 got about 18 on the highway but really likes fuel when just bombing around. I would never go back to a carb now that I have efi. As far as performance goes its much better with the EZ EFI. I think now that there is a lot to choose from the bigger decision is NOT "should I do it" but "what system should I do it with". From what I've read there all pretty good and pretty equal.

I’ve been looking at three TBI products with bolt-on, self-programming: FAST EZ-EFI, Holley HP EFI, and MSD Atomic. My engine is a mild 350 SBC, a ZZ4, with an HEI disty. I already have dual fuel lines, in-tank electric fuel pump, and adjustable bypass regulator capable of 65 psi. Reading the manual on the FAST, I couldn’t find instructions on controlling ignition timing, which I think is an important capability of EFI. The Holley fuel inputs at the rear are inconvenient, the wiring harness is spaghetti, and the injectors are in the air flow, but it does permit manual programming. It does have ignition control if I replace my disty with a product from another vendor. The MSD Atomic seems the best on paper. It has a cleaner wiring harness even though it needs a digital ignition controller, good location on fuel inlets, and ignition timing with an MSD disty and their lock out rotor. One manufacture for everything. The downside is that the Atomic is a new product. Just my opinions. Comments?

I’ve been looking at three TBI products with bolt-on, self-programming: FAST EZ-EFI, Holley HP EFI, and MSD Atomic. My engine is a mild 350 SBC, a ZZ4, with an HEI disty. I already have dual fuel lines, in-tank electric fuel pump, and adjustable bypass regulator capable of 65 psi. Reading the manual on the FAST, I couldn’t find instructions on controlling ignition timing, which I think is an important capability of EFI. The Holley fuel inputs at the rear are inconvenient, the wiring harness is spaghetti, and the injectors are in the air flow, but it does permit manual programming. It does have ignition control if I replace my disty with a product from another vendor. The MSD Atomic seems the best on paper. It has a cleaner wiring harness even though it needs a digital ignition controller, good location on fuel inlets, and ignition timing with an MSD disty and their lock out rotor. One manufacture for everything. The downside is that the Atomic is a new product. Just my opinions. Comments?
EZ EFI does has no control over ign timing. You set it was you would with a carb then make adjustments from there. I agree with you on the Holley system. I don't their throttle body set up. I guess it comes down to money. Any of these systems will give you good results. I'm partial to EZ but the MSD looks pretty nice. I think its a bit more money than the basic EZ package which is what you need.

I'm partial to Holley as Steve is partial to the EZ. My suggestion is, call each manufacturer's tech assistance and see who even answers the phone, and give you satisfactory advice/support.

The Holley has impressive iginition control, which IMO is almost as important as the EFI iteself. Not just spark control itself, but your talking multiple rev limiter, ign retard, start retard, etc, etc, etc. Also has datalogging. Considering these systems are all priced about the same, I find it real hard to give up the Holley features.

I'm partial to Holley as Steve is partial to the EZ. My suggestion is, call each manufacturer's tech assistance and see who even answers the phone, and give you satisfactory advice/support.

The Holley has impressive iginition control, which IMO is almost as important as the EFI iteself. Not just spark control itself, but your talking multiple rev limiter, ign retard, start retard, etc, etc, etc. Also has datalogging. Considering these systems are all priced about the same, I find it real hard to give up the Holley features.
Don't get me wrong here, I like the features of the Holley system too, just don't like the throttle bodies they use and didn't want to go to a muliti port system.

The Holley has impressive iginition control, which IMO is almost as important as the EFI iteself. Not just spark control itself, but your talking multiple rev limiter, ign retard, start retard, etc, etc, etc. Also has datalogging. Considering these systems are all priced about the same, I find it real hard to give up the Holley features.

The Holley HP seems to have the advantage in allowing the user to configure the ignition control. The MSD Atomic has less programmability. From their manual:

"You control total timing and when timing comes in, but the Atomic
can make dynamic timing adjustments at low engine speed to help with easier starts and smoother idle. To use the timing feature, the distributor will need to be locked out and an adjustable rotor is required
as well as an MSD Ignition Control."

The Atomic has menu inputs for idle RPM, total RPM, idle advance, total advance, and vaccum advance. We all know about the MSD CD boxes with multiple spark. My application is fairly vanilla (mild 350 SBC), so I think these settings will be satisfactory for TBI.