FAST EFI vs Holley HP EFI

[Gunnytron]

So, I was all set to get the Holley HP EFI then I saw the FAST GM LS Transplant Kit.

Anyone got opinions on either. I guess Holley allows more indepth custom tuning, but it is a little more expensive.

FAST also comes with an ignition controller, whatever the f@*k that is?

[digitalsolo]

Which FAST kit is it?   XFI?

I have several friends very happy with Holley setups;   the guys I know with FAST are happy as well, but it seems to have taken a lot more effort/knowledge to dial it in.

[BeasTT]

ProEFI

[Gunnytron]

I was looking at the ez-efi kit

http://www.fuelairspark.com/fas/ez-efir-gm-ls-gen-iii-iv-engine-kithtml/

[wes kiser]

The ignition controller is simply because the XFI is not intrinsically capable of decoding the LS tooth pattern, and individual coil control.  It sends a 1 pulse per cam rev, and 4 pulse per crank rev (IE, looks like dual sync distributor) to the XFI box, and communicates with the XFI box via a CAN bus. Means you run 2 boxes and harnesses instead of the 1 that should be required.

I would look at this (it is SUBSTANTIALLY more capable than either of the 2 systems you are considering):
http://www.efisource.com/shop/ms3-lsx-plug-and-play/

The harness is nicer, the system is more capable, and the tuning software is better.

[digitalsolo]

I don't know if I'd call the MS3 substantially more capable or the software better vs. the Holley.   Maybe the basic FAST system.

[Gunnytron]

I've not looked at megasquirt before, interesting though I like the idea of the noob friendly auto tune of the Holley.

If I was going to go full-on and learn to tune myself then I would have to think about just getting a loom and using the existing ecu with hp tuners.

[wes kiser]

I've not looked at megasquirt before, interesting though I like the idea of the noob friendly auto tune of the Holley.

If I was going to go full-on and learn to tune myself then I would have to think about just getting a loom and using the existing ecu with hp tuners.

VE analyze live (Tunerstudios version of "autotune") is the only "auto tune" feature I have used that I actually liked.   It works quite well, but resides in the tuning software.  There are certainly plenty of online testimonials of the Holley systems "tuning themselves" as advertised, I just would personally plan on helping it along for optimum results.  Any EFI system that tells you it completely tunes itself is either lying, or the people making the claim have low standards.

I have actually put some effort to research actual product capability of the Holley HP stuff, but very little information regarding actually capability and strategies is clearly communicated.  For the task of simply operating an LS based engine, it doesn't really matter.  If the decision is between the FAST and Holley, get the Holley.

90% of that stuff is marketing.

[wes kiser]

I don't know if I'd call the MS3 substantially more capable or the software better vs. the Holley.   Maybe the basic FAST system.

For simple operation of an LS based engine, this is likely a true statement (capability, not software).

[gnx7]

The Holley interface is a cake walk to navigate thru the tuning/setup compared to the FAST.  Unless you are trained on the FAST and use it weekly (if you were a professional tuner) good luck trying to figure it out and use it yourself.  You are once again at the mercy of a tuner.

Mine fired up on a borrowed tune that was a 440 vs 427, different cam/heads, and once it warmed up to the set coolant temp in the Holley borrowed map the WB02 kicked in and started the self learn tuning.  It was a matter of driving it around under different load conditions to have the Holley further refine the tune.  Cold/Hot restart is up to you.... but the Holley does a great job of getting most of the tune down.

I can switch from 24x to 58x reluctor wheel, add traction control, boost control, good data logging, low oil pressure shut down, high coolant temp shutdown, 2 step/launch, increase timing for e85/91 blend (Holley makes the needed fueling corrections), etc.

The Holley isn't the be all end all; however it is very very nice for most users and easier to learn and make changes in real time.

[Ls1-fd]

I have used both on my car and I like the Holley better. Both work very good, I just like the Holley interface better.

[Gunnytron]

Sounds like its still the Holley for me then. Thanks for all your comments.

[Supe]

HP EFI user, albeit on a first gen SBC.

I didn't know a damned thing about EFI, yet still managed to get the thing to fire up on the first shot.  Tuning, timing adjustments, etc. are all a breeze.

I STRONGLY suggest ordering from a reputable vendor.  I got my stuff through Brian Macy at Horsepower Connection.  He took care of all my troubleshooting, his connections with the folks at Holley had me a next day aired ECU when mine wouldn't sync via USB, and when I've had small problems, he's taken over my laptop and made tuning adjustments for me real-time.  I love it, and will never go back to carburetors again cost-permitting.

Note that he talked me out of the EZ type setups from the various vendors.  They work well, but when they don't work perfectly (funny idle behavior, etc.), you become very limited in what you can fix vs. what you have to learn to deal with.  I liked having that bit of extra adjustment, plus the adaptability going forward. 

[1320king]

I believe the new FASTEST STREET CAR IN AMERICA (youtube it) runs a holley dominator efi but pretty much the same thing with some added goodies 

[Supe]

Another plus of the HP EFI system that previously annoyed a lot of people, is that it now is able to interface with a RacePak system.