I had planned on putting the FAST XFI on my 66 Skylark 455 but I am now thinking of putting the XFI on the Somerset and putting the EZ-EFI 2.0 on the Skylark. I have read lots of reviews on the system and it looks like 4-5 years ago when they did the roll out the system was junk but later articles and reviews are more positive. Anyone on the board have any experience with this system. Thanks,
I use the old Speedpro (predecessor of the XFI) and love it. I've been looking at upgrading to the XFI, but mine just works so well... For the EZ-EFI, I have heard about problems with it but those questions come from people who don't sound like the type of person who should be running FI. I know the EZ-EFI should just "bolt on and run" but I think you still have to understand the system and its limitations. For my money, I would only use the XFI, but admittedly that could be because I'm a bit of an FI snob. -Bob C.
I would buy it in a heartbeat. In fact I almost did, but FAST was able to repair my old ECM for much less money and I couldn't justify the extra cost for the few features I'd be gaining. The only thing is I've heard that the traction control isn't worth the extra effort. Since essentially the traction control just pulls back timing when it senses wheel spin, you can just manually adjust the timing table in that area instead. I'm not sure if that would still apply to cars with very loose race-only torque converters, but in my car when I'm going down the track after a shift I don't go back into the same RPM range where I would be adjusting the timing for wheelspin. The only reason I'm opposed to "self-learning" is that as I tune (either live or based on a recorded run), I get to watch each individual cell and observe it's behavior. The thing is that you are *never* only in a single cell- you are actually always on multiple cells, and the software is interpolating between the values of adjacent cells. The learning algorithm could work perfectly if you could land exactly in a cell and have it self-tune, however I like to watch the system react when it is in multiple cells and tune it myself. Perhaps I am too paranoid or a control freak - that's just my own feeling. Having said that, there is a multitude of happy EZ-EFI users out there with the self-learning. -Bob C.
