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My 91 Golf is well on it's way to running really nice (new oxygen sensor, and new knock sensor on the way). While I was searching for Digifant II troubleshooting info (even though I have the Bentley book, I still like to search the web), I found a guy who sells reprogrammed Digifant II chips. There are a few choices out there when it comes to Digifant II chip upgrades, but some of them ignore knock sensor input, which requires you to run high octane fuel all the time. One of the most well known upgrades is the Autotech chip, which also comes with an aluminum bushing to mount between the knock sensor and the engine block - that basically dampens the feedback through the knock sensor, which I'm not crazy about. To me, if the knock sensor and ECU are working correctly, and if the engine itself is in decent mechanical shape, then there's no reason to alter the factory knock sensor setup. I'd rather keep that functionality 100% intact if possible. This other chip I just found out about not only preserves the knock sensing system, but actually samples input from the knock sensor (as well as several other sensors) more frequently than the stock program. The chip gets great feedback from other folks who have used them (there is an entire thread on VWVortex dedicated to praise of this chip upgrade), and seems to be more of a driveability upgrade than a performance upgrade. Well, the chip upgrade is only $42 including shipping, so I went ahead and ordered one. I will put up a post once I receive it and install it. These chips only work with certain Digifant II ECUs - luckily, I have a KEN box which is original (as opposed to the later boxes issued around 1996 which supercede the original ones). Siemens, Triumph-Adler, and Bosch also made original Digifant II units.

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Date: 03/25/07, 18:34:03 PDT
From: gerhard schultz
Comments: looking for a performance chip for 91 digifant 8 valve with ken ecu

Date: 03/27/07, 13:23:42 PDT
From: max
Comments: Techtonics Tuning sells Digifant II chips ( http://www.techtonicstuning.com/showpart.asp?partnum=133.369 ), but you will need to get the number from your KEN ECU and give them a call to find out if their chip will work with your ECU. AMS ( http://www.advancedmotorsport.com/site/main.htm ) can also still provide Digifant chip upgrades, but you will have to call them because they no longer list them on their site. Autothority ( http://www.autothority.com ) used to sell Digifant chips, so it might be worth calling them as well to see if they still have them (though they are not listed on the web site). I also have a KEN ECU, and the chip I used is a Digifast II chip from vw_pilot. He's a guy named Pete, and his e-mail address is vw_pilot@hotmail.com - just send him an e-mail and let him know you're interested in a Digifant II chip for yoru KEN ECU. He will let you know what information he needs, and how much the chip will cost. He sometimes takes a long time to respond to e-mails, but he is an honest guy. Good luck!

Date: 04/06/07, 18:59:46 PDT
From: Joe Wilson
Comments: What chip is this guy talking about I need one also!!

Date: 04/08/07, 08:01:46 PDT
From: Max
Comments: Joe, just check my comments above. I recommend the digifast chip.