Tuning for Smog Test

[ferocity02]

What tips/tricks are out there to help the engine burn cleaner for smog testing?

My vehicle is an '01 Silverado 5.3L LM7 with a 212/212 114LSA cam and unported but milled (for stock 9.5:1 SCR) 799 heads. The car is mechanically sound and will pass the visual and OBD (I hope), I'm just slightly worried about the sniffer test. The cam isn't all that big, but I don't want to fail because then the vehicle may become a "gross polluter" and will require even more strict smog checks.

So let's assume I'm starting with a completely stock tune...

Would a tuned VE table be better than a stock one?
Fan settings, higher or lower?
Other tricks for cleaner exhaust?

Thanks!

[joecar]

Run a normal CLMAF tune.

LTFT able to trim properly (sensible trims, with no pegging).

O2 sensors in good condition.

Cats in good condition.

No air leaks.

The general consensus is that cams with at least 4° underlap (i.e. -4° overlap or more negative) (@.050") are capable of passing (yours has 16° underlap).

[joecar]

What state...?

[ferocity02]

Run a normal CLMAF tune.

LTFT able to trim properly (sensible trims, with no pegging).

O2 sensors in good condition.

Cats in good condition.

No air leaks.

The general consensus is that cams with at least 4° underlap (i.e. -4° overlap or more negative) (@.050") are capable of passing (yours has 16° underlap).

What is "CLMAF"?

In in CA

[joecar]

CLMAF = CL + MAF (i.e. both enabled, as from factory).

[joecar]

I'm interested in:
- how long the OBD2 scan takes,
- will they run your car on their roller/dyno.

[ferocity02]

CLMAF = CL + MAF (i.e. both enabled, as from factory).

Do you think a stock tune will suffice?

My county has the basic testing, so no roller/dyno test, only a stationary test at two engine speeds in neutral.

[joecar]

If closed loop trimming is working properly (LTFT's are not pegging at max or min) and the cats are in good condition then it has a good chance of passing.