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Originally Posted by ohcbird
What, no Gen 7? They offer the best driveability (IMHO). Maybe Andrew B can comment on why their setup comes that way...
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DFI is old and busted in comparison to BS3, not even in the same sport let alone ball park.
With a blower motor your going to be running some big injectors, when you price the driver and such it's not that much more for top of the line equipment. I honestly don't know much about 950, never had a chance to play with one. I have however had the origional FAST (not xfi), DFI, and BS3 in my hot hands and done some work with them. Fast is definitely the oldest of the bunch and it shows, things don't load as fast, no updates with the key off, and it's just missing a few features of the newer stuff. That being said it's still a great system and MANY people run it on some very very fast cars. I have it on my truck and it's more than adequate to tame my 408 on CA pump gas, and will control all the nitrous I can throw at it.
DFI has a better injector driver so it will power big low imp's and still idle great. I'm not sure at what point it makes a huge difference, and a lot has to do with your ability to tune the system. I personally ran 42# for quite a while N/A and the FAST worked great. When I droped the 83# in it idle quality got a little choppy. Not the end of the world but enough to notice.
After setting up one BS3 I hate playing with anything else. It's by far the superior system in every respect. The baseline tune is very easy to get up and running, you can make adjustments to the pcm for 30min with the key off , it has a great multi-stage boost controller, awesome injector driver. It's just about perfect for 95% of the applications right out of the box. Plus you don't have to run that $400 FAST wideband O2. It's the only system I've ever used that we went from a blank program, doing system checks, to on the road drivability tuning with in an hour. Try that with anything else, most people wouldn't know where to start with 50 blank maps, the system really walks you through it and gets an excellent base line.
Figure out what your budget is and what you want the system to do. You can find used FAST boxes for dirt cheap these days depending if you want sequential or bank to bank. Even a new BS3 is in the $1600 range, injectors, fuel system, and you can make it happen under $2500.