Quote:
Originally Posted by Megan370z
it wont matter much because the oxygen sensor are still doing their job and will correct your AFR to be where its suppose to be in closed loop ( idle / light cruising )
and then in Open loop (like 30%-100% engine load) your MAF are still doing their job by calculating the air flow going in. So it doesn't matter if you change you intake manifold for another one.
The difference in AFR wont be very much different after the intake manifold swap. only by a couple tenth of AFR. because the load rating will be moved into other cells.
Unless you were already running very lean at WOT. I wouldn't worry if I was you. the system can adjust up to 25% more or less fuel than stock form.
but I would also recommend doing a tune to extract the most you can and there isn't any need to drive it like an old lady.
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I did the grandma driving for about 100 miles, just to make sure the car had adjusted, then drove normally without a tune for about a month, then finally made the trip to Z1 for a tune. I had no issues during the time that I was "tuneless."