is there a way to make my bac valve work with a micro tech. do the lt8s come with a bac valve function.

 

LT8s should be upgradable to BAC control using the aux output. You will have to send the ECU to Microtech to have the upgrade installed. Hopefully it can be done because in my case, I was told that my LT8s was too "old" to have the upgrade...even though it was purchased about 2 years after the LT8s was release and Microtech promised all the "S" models were upgradable.

 

cant I just use the aux out put it comes with.

 

Not unless Microtech has set that port up to drive the BAC. If it is stock, then that output is just an on/off signal for driving a relay to control a fan, nitrous, etc.

 

o I see. so basicly the lt8 only has one extra out put

 

The LT8s has only one configurable output. And by "configurable", I mean that Microtech can configure it if your software/ECU version allows it.

 

Can I have them upgrade it before I buy it.

 

Yes, buy why in the name of all that may be holy would you buy a Microtech these days BRAND NEW? Spend the same amount of money on an ECU that isn't 10 years in the past, like a Haltech Sprint RE.