Johnny Sack

i will be buying an VFAC here in the next week or so and of course want it dyno tuned. my local tuner told me that i had to have a bung welded in my TP for their o2 sensor. is this typical? i do see why they can use the oem o2 sensor for tuning, after all vfac ties directly to the ecu. help? thanks guys!

WalkingDrunken

Is your tunner planning on putting a wideband on your car at the dyno? A lot of the time I see dynos having their wideband device that goes in through the exhaust. If you have your cat installed this might not give the best readings.

If you have a wideband to install on the car and you have the stock header than chances are that you will have to get a bung welded on. A few aftermarket headers have a secondary Bung in place.

Either case when going to the dyno and changing your fuel settings you do need a wideband of some sort because the stock narrowband will just not do.

Johnny Sack

thanks just what i needed to know!