"I have 04 Vz Sv6 stock plus K&N Filter......after a 2 hole mod and oil change I definitely noticed a small but noticeable increase in throttle response. When putting foot down hard on accelerator ( e.g. fast take off or fast overtaking ) there is definitely a small but noticeable increase in the sound quality - like an extra low note is now available at times. " 2011
Well its been a while, thought I'd update my thoughts on the 2 hole CAI mod and also answer Ryan101's question about mileage.
I am a self taught amateur mechanic, from what I've read, installing a MAFLESS CAI is not a good idea. Some say that a tune is not required, others have said a tune is essential because " it will upset MAF variables relating to air flow", and the rest seem to agree that disconnecting the negative then positive battery terminals for 10 minutes or so will reset the ECU and adjust automatically.
Originally, I did the 10 minute reset suggestion. Besides what I mentioned in my first post, I have yet to see any other benefits. Until now......
I performed a COMPUTER RESET PROCEDURE that I have so far failed to see mentioned elsewhere. I'll list the instructions below, any constructive feedback would be great.
My previous mileage was 12.21 L/100kms in city full of traffic lights and around 10 - 11 on the motorway, a week after performing the new reset my motorway mileage is down to 8.41 but its still too early too get a reliable reading I think, and I haven't done enough city driving but I'll get back soon.
RESET
1-Disconnect the negative, then positive battery terminal, now leave it disconnected for 30 minutes.
2-Put the key in the ignition ( terminals disconnected still ) and leave it in the on position for another 30 minutes with the battery terminals disconnected.
3-After 30 minutes ( 1 hour in total so far ) hold the brake pedal down for 5 seconds.
4-Turn the key off.
5-Reconnect negative, then positive terminals.
6-IMMEDIATELY drive for at least 30 minutes, preferably on the motorway.
Maybe it is just me, but the car seems to be running much better overall now and so far the mileage has improved.
Keen to hear your thoughts.......