Holley Mpfi Vs Xfi Efi
The Holley computers suck ***. I have seen far more bad 950 Commander computers than good ones. They are more bug ridden and hardware fault-plauged than Windows ME on a bad Chinese copy of an Acer computer. The stealth ram intake, however, works damn good. It allows a much smoother low end, and almost the same top end as a large single plane carb style intake. BTW, my only experience with the Holley systems have been on a .030 overbored 400 smallblock and a 434 motown motor, both with large cams and excellent heads. Between those two builds, we finally got one computer to work properly out of 6 or 7 that were sent back.
Staging Lane
Joined: Aug 2005
Posts: 95
Likes: 0
From: USA
I run FAST XFI on the Camaro.
Most annoying thing about it - if you are tuning it real time, you MUST disconnect for the changes to be saved. This sucks because the software will lock up occasionally when you are logging + tuning at the same time.
The UI isn't bad but its no HP Tuners or EFI Live. There is no way to take logged O2 correction data and apply it the fueling which would drastically speed up the tuning process.
It offers some neat features though -- 16x16 maps, multiple tunes (4 user selectable channels), misc. inputs, and comes with a leaded race gas compatible wide band sensor (L2H2)
Most annoying thing about it - if you are tuning it real time, you MUST disconnect for the changes to be saved. This sucks because the software will lock up occasionally when you are logging + tuning at the same time.
The UI isn't bad but its no HP Tuners or EFI Live. There is no way to take logged O2 correction data and apply it the fueling which would drastically speed up the tuning process.
It offers some neat features though -- 16x16 maps, multiple tunes (4 user selectable channels), misc. inputs, and comes with a leaded race gas compatible wide band sensor (L2H2)
The actual Stealthram intake could be used with ANY aftermarket EFI controller. My neighbor with the 434" in his vette just switched to a Haltech, but it has a few mostly minor issues we are working out. Getting a base tune sorted out was a serious bitch, and the PWM outputs are a little odd. I would rate it less user friendly than AEM, but more user friendly than Snyper.
Ive had the FAST Xfi in my stang for a week now.....so far, I love it.
If you want to make a trip to memphis I will be glad to show you the software, tuning, install.
I can also get you a great deal on one as Comp is one of my shops biggest supporters.
If you want to make a trip to memphis I will be glad to show you the software, tuning, install.
I can also get you a great deal on one as Comp is one of my shops biggest supporters.
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Run from the Holley!! 
well.... TBH I'm not really joking. I don't think their software has seen a revision since the late 90s, and for the setup I worked on, it was action-packed with issues. The Fast seems much more modern by comparison, though you are right, it is cell by cell tuning for the most part.
well.... TBH I'm not really joking. I don't think their software has seen a revision since the late 90s, and for the setup I worked on, it was action-packed with issues. The Fast seems much more modern by comparison, though you are right, it is cell by cell tuning for the most part. LS1 Tech Stories
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TECH Regular
Joined: Jul 2006
Posts: 420
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From: Jxn,Mississippi
btw would you suggest just the ecu set up or the whole setup intake and all?
that would be great! if you would do that i'd be more than happy do let you do the tuning. i was actually planning on being in memphis some time this summer so that would make my trip more worth the while. hit me up w/ a pm on about how much i would need for the setup.
btw would you suggest just the ecu set up or the whole setup intake and all?
btw would you suggest just the ecu set up or the whole setup intake and all?
I'm not sure what you are talking about having to "disconnect to save the changes"? I use one in my race car, also sell and tune them. Whatever you type in while it is running, that is what is in there when you disconnect. You do have to save the file to your pc to have a copy other than the one in the XFI box. I have not had lock up problems with it, like I have on one machine with Hptuners. Do you maybe have a screen saver or anti-virus software installed? It's best to not have anything running in the background when tuning in real time.
Btw, I agree about the Holley stuff. Avoid it like the plague. Way too many ECU failures.
Staging Lane
Joined: Aug 2005
Posts: 95
Likes: 0
From: USA
I'm not sure what you are talking about having to "disconnect to save the changes"? I use one in my race car, also sell and tune them. Whatever you type in while it is running, that is what is in there when you disconnect. You do have to save the file to your pc to have a copy other than the one in the XFI box. I have not had lock up problems with it, like I have on one machine with Hptuners. Do you maybe have a screen saver or anti-virus software installed? It's best to not have anything running in the background when tuning in real time.
Btw, I agree about the Holley stuff. Avoid it like the plague. Way too many ECU failures.
Btw, I agree about the Holley stuff. Avoid it like the plague. Way too many ECU failures.
If whoever is in the driver's seat turns the key to off (and kills the power) before the disconnect command is issued, all changes are lost.
My Toughbook is more then capable and I have never experienced lock ups with BS3, HP Tuners (in real time), EFI Live, SCT, AEM, Motec, applications that are coaxially installed and used.
A "smooth" function would be nice also.
I can't imagine anybody doing that, but I guess if you have a helper in the driver's seat it could happen. I do all my part throttle, transitions, etc, on the dyno so I don't need somebody else driving and don't have to watch traffic. Most of the FAST stuff I have done lately are race cars with no mufflers. Couldn't drive them on the street anyway. Last two are NHRA Stock Eliminator cars. One changed from a Holley C950, the other from DFI.
save changes... oh yeah, and i cant say that ive ever had to save changes. when you make an adjustment, it is changed. if the power goes out, the file stays where it was at, after you made the last change. I am pretty sure about that. After making changes i usually close out of the program and dont go to any save all tables, ive never had it revert back to the way it was before the changes...
Staging Lane
Joined: Aug 2005
Posts: 95
Likes: 0
From: USA
oh yeah, and i cant say that ive ever had to save changes. when you make an adjustment, it is changed. if the power goes out, the file stays where it was at, after you made the last change. I am pretty sure about that. After making changes i usually close out of the program and dont go to any save all tables, ive never had it revert back to the way it was before the changes...