Originally Posted by HDDP
The car has been retrofitted with dual 3" CAI's, cats have been removed (O2 sensors inplace) I run a mixture of 91 pump gas with a % of Toluene and Xylene and a % of Klotz Coxoc. The chip was flashed with a PowerChip Gold 93.
The car seems to be running very lean with a sporadic misfire at idle. Plugs are changed after 3 events.
So, you can see why I need mapping and alteration capabilities.
In this case you should scan MAF, fuel trims, O2 voltages...At idle, at 60 mph highway cruise, and in 3rd gear WOT from 1k rpm to redline.
A baseline scan of the same data will show how flow might have changed.
CAI's sometimes can create issues with MAF reporting (too much or too little airflow) which will cause a lookup error..the fuel trims will try to compensate but if there is a code preventing adaptation they won't.
Did you remove any airflow straighteners from the MAF? Do you have any stored codes? Sometimes removing the CAT causes codes (it thinks the CAT is bad) this could prevent fuel trims from adapting properly (O2 sensor ignored).
Have you dynoed the car?
The trican would be a perfect investment for you IMO. I use vag-com
http://www.ross-tech.com and the tricom cables for data collection.
some examples of the fun you can have, these are baselines from my 1.8T:
Interesting note is look at the power vs AFR of these 3 pulls...big changes yet the MAF is about the same for the 3 runs....inlet temps are a bit higher though.
stockAF.jpg
stockdyno.jpg
stockcruiseAF.jpg