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Old 07-10-2018, 05:36 PM   #1
Richard Grant
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Default EFI control units

What units are racers using? Which is best for a LT1?
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Old 07-10-2018, 05:50 PM   #2
brett3533
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Default Re: EFI control units

Holley is works very quick and friendly also they can provide a school for you in Bowling Green Kentucky If you want to learn there system also they offer great support and attend most national events to assist you with showing you how to tune on it however you need be able use % tables for them to help
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Old 07-10-2018, 06:47 PM   #3
Sean Marconette
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Default Re: EFI control units

The best advice I can give you is download the software for both Holley and FAST and see what makes the most sense to you and how user friendly the software is. Your going to get replies stating that either of the two systems I listed are the best.

For me, going from carb to EFI in 2015, the Holley software made more sense to me. FAST or even some of the others may be a better fit for how you look at information and who is around for help.

Good luck
Sean
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Old 07-10-2018, 07:58 PM   #4
Tom Goldman
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Default Re: EFI control units

I've installed several Holley HP units replacing older Holley Commander and FAST XFI systems in both LT1 and 3rd gen Hemi Drag Pak cars.
Significant gains are there for the LT1 combo in the hands of an experienced tuner . [I am not one of those ] :]
New HP harness' are greatly improved over older Holley and FAST harness'. ..very simple installation.
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Old 07-10-2018, 08:46 PM   #5
Ed Wright
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Default Re: EFI control units

I have had great luck with the FAST XFI.
Same spark advance, same air/fuel ratio makes the same power, unless one of the ECUs is extremely slow. FAST XFI is not slow. Equal processor speed, equal tuning, one brand ECU won't make more power than another. I have found no advantage to the Holley system. If that is what you are used to, you will like it better.

Been to the Holley school, still like the FAST better. COPOs I have worked with had the Holley, so I went to their school. Twice, actually.

Last Holley I worked with, a couple of COPO cars last summer, I still could not do something I do with my car's tuning, that makes my car quicker.
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Old 07-11-2018, 12:05 PM   #6
John Stock
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Default Re: EFI control units

I've had EFI combinations since 2000, I started with original FAST, then Holley Commander, Commander 950, Fast XFI and also using Holley Dominator/HP. Use on SBC, LS, and Ford combinations.

I'm with Ed, no extra power available from any system as all control same basic functions for us. Only difference is really user interfaces. Never had a box of any type go bad.

I am going to consolidate on the Holley HP/Dominator system just because I can't keep as much information in my head as I once did and am trying to simplify. If anyone wants Commander or FAST XFI stuff, I've got some that could go. Just PM me and I'll see it , eventually.
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Old 07-11-2018, 12:29 PM   #7
Ed Wright
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Default Re: EFI control units

Holley did make the interface easier for newbie, and probably easier for us old guys to remember. One won't make any more power that the next. That's simply the guy doing the tuning.
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Old 07-11-2018, 02:34 PM   #8
Dan Fahey
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Default Re: EFI control units

Which Holley HP Part Number is for LT1 ?

I see LS1 Holley System on their web site not LT1.

d
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Old 07-12-2018, 09:06 AM   #9
Tom Goldman
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Default Re: EFI control units

My statement that there is more power there is based on my observations of customers cars after the HP unit has been tuned.
As you said Ed, it's the guy doing the tuning for sure ,but in both cases the same guy was doing the tuning .
The results I've been told are not in peak HP or torque ,but rather in ability to tune each cyl. individually and getting gains in the mid rpm range.... This was on a car that previously used a Holley Commander 950.
As far as the Fast XFI goes ,That car also had some gains ,but again ,according to the owner ,it was found under peak hp.
The simplicity of the Holley HP for me makes it a better choice over the XFI particularly on engines using COP ignition......The XFI harness is bulky and clumsy.
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Old 07-13-2018, 11:39 AM   #10
Ed Wright
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Default Re: EFI control units

Tom, he asked about the LT1, which uses a single coil.

Evidently your same Tuner was more familiar with the Holley system. There is absolutely one system will make more power, anyplace, than the other system. That would be a reflection on the Tuner. If both systems were not run on the same car, same dyno, you can't know anyway.
Spark advance is spark advance, air/fuel is air/fuel. The engine does not care how it got there. I have tuned enough vehicles with both systems to know that. The 8 coil deal with LS based engines looks easier with the Holley. Nothing else.
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