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Of course.

The issue I'm chasing is, when airflow and VVE are more or less dialed in under operating conditions, trying to get cold starts improved seems to be highly limited by the idle vs ECT,...

Quoting myself - ok. a 5pct reduction in this table drastically reduced cold start airflow, so however the math is computed, it is much more exponential than linear.

Table 13426

The Initial VE airmass correction factor table is indexed to Baro and ECT.

I see little about this table in my searches. After constantly messing with Idle airflow (the Startup...

Thanks for your help, Greg - I know you've been doing this a LONG time. :D

relatie to my cam, the OEM injection settings were so early that I think I was actually injecting fuel into the open...

My understanding is that ethanol has a faster flame front (ie burns "faster") and requires less timing advance.

But it also requires ~30% more fuel volume.

So why would I want to advance...

Greg,

I've had this motor and cam running for 2 years as a daily (15k miles plus). It idles at around 820 RPM very well, but you're right - lowering FP for higher resolution would be a good...

AllPro heads - the motor was professionally built. I've been daily driving it for around 2-3 years now so I'm coming up on valve spring replacement already. I've just been focusing more and more...

Another question is: approximately how many degrees of crank rotation should we approximate for fuel to actually reach the cylinder (FRC values) when cold, vs hot?

When hot, I'd guess it's almost...

2013 CTSV - the original cam was a 198/216 .480 / .480 122.5LSA. Since I don't have 0.006" values for either the stock or current cam, I was thinking about using the relative delta change in valve...

Agree with the gap being closer to 0.25 or 0.028; and copper tipped plugs will be more forgiving than iridium.

If I had to make a wild guess, you're too rich in the low load ranges, and the high...

I can't open your file (I guess I need to update my HPTuners software); but my first thoughts are: you're either not in High Flow mode, or you need to increase pump duty cycle relative to Flow and...

Per my PM: Yes, go to the FPCM tab in "fuel" in HP Tuners. Go to the DTC tab on that page. Scroll down to P0231, and select "no error reported." You may have to pay extra to access the FPCM portion...

I just did this in my CTS V. All numbers are assumed to be for the CTS V, however it should correlate easily.

First, you need to log fuel flow rate, fuel pump duty cycle (make sure it is...

Update: minimum idle airflow was the culprit! Everything has been peachy since my last post. Thanks again, Schpenxel.

I just wanted to update the thread:

I did lower my idle final minimum air table by around 5% and it seemed to reduce the negative idle adapt advance by approximately half. Initial impressions...

Thanks!

Your correction makes more sense to me, and I appreciate the detail. I will try a lower minimum final airflow and see what happens. I don't mind experimenting, I'm just trying to keep...

I raised the final minimum airflow ~5% and it made no difference. if anything, cold start is more choppy but the idle adapt advance issue is unchanged.



Idle adaptive advance only starts when...

2013 CTS V Wagon, Manual transmission. Stage 2ish cam, stock heads, ~28% overdrive/pulley on the supercharger, injectors, ported supercharger, headers and the usual cooling mods.

I am really close to an otherwise PERFECT idle on my setup. I've lowered the timing on the idle spark and high output spark tables after reading many threads that come up with my searches... and it...