Real close to pulling the trigger on this for the 440" W2

Any real world feedback?

My buddy Nats jeep does really well with it in a 442" 545hp CJ-7 on the street and occasional track use ( runs 12.30's not bad for street trim 3800 pound w/d 4X4

I drove Nat's Jeep a little bit at Jeep Beach, and the throttle response was insane. That's what pushed me to put the Terminator EFI on my Jeep. In retrospect, I should have done the MSD Atomic for the timing control benefit, but since I sold my Jeep, the point is moot. I definitely say, go for it!

Now imagine Nat's motor with W2 heads and in a 600 pound lighter car. Im hoping the response and daily driver hassle free efi system would justify the cost. Natt back to back dynoed the rfi against my 1000HP 4150 and they were virtually dead even hp/tq though.

Its about $1400 more to go efi/ pump vs new carb/pump

I've been running an Atomic since the beginning of this summer and have had nothing but great results. They are by far the least obtrusive of all the aftermarket kits when installed because their ECU and fuel pressure sensor, unlike FAST's, are built into the throttle body. The only external "box" you have to mount is the power control unit, and that has the footprint of a large mobile phone. The harnesses were all of very nice quality and seemed to be loomed a lot tidier than the FAST and Holley offerings. One last feature I liked was that the TB has a built-in throttle return spring, which is a nice touch in-terms of removing clutter and making it into an integrated package.

Drawbacks or dislikes aren't numerous, but I do have them. First, you can NOT use the PWM feature with any fuel pump other than MSD's because they use a proprietary frequency. Two, if your motor has a very poor vacuum signal, count on using a single plane intake only. The system will tolerate down to 9" HG of vacuum, but MSD recommend single planes in low-vacuum situations. Third, the horsepower limit of the system is definitely there with only 4 80PPH injectors. The more expensive FAST EZ EFI 2.0 runs 8 60PPH injectors, so that's the only game in town if you're going over 640 horse N/A with a kit like this.

The driving characteristics of the kit have been superb. I'm running my Atomic on a 512 that pulls 12" of vacuum and I don't have any issues. The car started on the first try and has only ever stalled twice. Both of those stalls, however, were during the initial learning phase of the ECU and have never happened since. Throttle response is ultra-crisp, cold or hot it starts almost immediately, and I've gotten a decent gain in fuel economy. You can set your own A/F targets for idle, cruise, WOT and fuel enrichment on throttle tip-in (like an accelerator pump). I honestly haven't had a single problem with it in-use. It is expensive relative to what you get, but I suppose that's the price you pay for a succinct fuel injection package wearing a brand name. All I know is that I don't regret buying it, and I don't miss the carburetor at all.

Let me know if you have an further questions and I'll answer them as best as I can.

I have one as well. Like stated above, very crisp throttle, no hesitation and I love the cold starts not having to help keep it run.

My biggest complaint with the Atomic and EZ, in anything other than a stock replacement capacity..........is you can't change ANYTHING. You are totally reliant on the tune and calibration the box chooses to run. On the Holley Terminator, it uses the same HP ECU as other kits. Meaning if you WANT to, you can plug the laptop into the ECU and makes changes as you desire

I figure this motor will make a solid "for real" 575HP/570 tq so it's a bit bigger than the base PWM pump 525 kit. Nat's motor makes 545 and he opted for the Aeromotive in tank pump kit and it works great.

Then again, when we did the back to back, another way to look at it is my Old Holley with MY base Jetting and it was right there with the EFI, we never even opened the bowls to try to optimize the carb...it was leaning out up on the top, the Holley probably might have made ~10-15 more

I want to do it more since I just want to have something new to learn and tweak, I like the idea of the Holley...but now that Holley has bought MSD it might be interesting to see what the next gen product might do.

I dont have many miles on my Holley unit but so far
I've been happy with it... if I wanted more power I
put in bigger injectors to support the power.. the box
takes care of it... I dont have the timing hooked up
on it yet but I will come spring time... that way it
will control both the fuel and timing

Have you looked at the Fitech efi.
It will go to 1200 HP. Everything is mounted on the body just like the msd.
Take a look at Fitech.com
I have it on a 650 HP 416 running e85. Pulling 6-7 inches vacuum. Nicely priced.

@wireweld,

Thanks buddy!! i'll check them out!!

We/Holley have some new plates coming out, that will be like a do it yourself throttle body kit..............Meaning you have a billet plate, that will hold 4 or 8 of the injectors of your choice and you mount it under the throttle body of your choice. HP will only be limited by the size injector you choose, or what your ECU is capable of handling. As good as a direct port.......no......but a pretty simple way to swap something over with a throttle body and not be limited to available aftermarket kits.

As to what Holley will do with MSD and it's line of EFI stuff......I have no idea at this time. All I know is the "Atomic" is a direct competitor with the "Terminator"............so who knows at this time. We also acquire Accel with the purchase. To think we don't need 3 separate EFI companies is likely not a far stretch

That FITech stuff looks pretty sweet and a good price point as well

Besides cost, what are the pros to the FITech package? And what do you feel the cons are?

Monte, thanks for that Insight,

I was kind of thinking that Holley (eventually) will try to consolidate and either wholesale adopt whatever turns out to be the most Trouble free and profitable system or (And I don't think the Venture Capital Investment team that runs Holley will spend the time to do this) try to marry the best of all the systems and come up with some 'hybrid' replacement system.

I'm impressed with the Atomic that I've seen, particularly that it took less than 40 minutes to completely swap from the 4150 to the efi On the Dyno and make a pull.

I am surprised the Accell EFI is even market relevant anymore.

Built in pressure regulator, injects above the blades, controls timing, change your tune on the go with handheld or plug in PC and program that way. I will think of more later.

The only possible negative I'm hearing/reading on some boards is that FItech has in the past taken $$$ but can't deliver on time or full shipments....been down that road before, I didn't like it much.

any personal experiences with them wireweld?

All EFI systems are the same........meaning that within the capabilities of the software and firmware, it does what you TELL it to do. All these guys that say so and so system does everything so and so system does, for 1/3 of the cost, are simply incorrect. It doesn't work that way. You kinda get what you pay for. Be that the quality of the components, the capability, the availability or most importantly......TECH SUPPORT.

On the throttle body stuff........they inject below the blade or above the blade, everything else doesn't matter. Just depends on which method you want or think works best. The other things, controlling timing, tune changes, etc, are simply based on what the ECU can do with the supplied firmware. Some systems are more limited than others...........as was mentioned with NOT being able to change the tune in the Atomic or the EZ EFI.

I can say that the Holley guy I deal with(Shawn or Sean)
really helped me out... they forgot a jumper plug with the
kit that I got.. it was for the mopar engines... they sent
the part out free of charge... after that they walked me
through the set up to verify what I had put in the ECU...
now I just leave the down load cable attached and just push
it up out of view.. that way I can down load anytime I wish
since this unit has a data logger built in
EDIT
Come spring time I will put on a crank trigger so it
will have the timing control... and I think I will put
on a couple more things to help... just for my own use

pre ordered one...two weeks later, I called and was told they were just receiving the shipment....a week later I had my unit...