Swank4

Whoops, I was looking at Scalbert's. Given *his* O2s, I wouldn't have predicted 11.0 AFR.

Avantgarde

I was getting those codes on my GIAC 3- setup. After trouble shooting many of the same things i found that i had a small, intermitent boost leak (at hte DVs and a bad spider hose assembly).

Fixing the leak made the car run better, but i continued to get the codes. I never thought to actually unplug and reset the ECU - so in retrospect maybe that would have elimintaed the CEL.

Went ASP fueling 1,000 miles ago and no more Rich codes.

Not sure this is at all relevant, other than to second P-smalls in saying check hard for a boost leak.

PSmalls::DoggieStyle

Scalbert's 02s would make me think mid to high 11s, but he dips to 10s on the WB....

Swank4

My line of thinking too (or even 12 AFR). I got the two cars mixed up.

BASELINE

seems strange that you're getting almost 40degree increase in IAT with AWE ICs.

scalbert

But yes, NB O2 sensors' outputs are very suspectable to EGT variations. Per the below chart, the only one I could quickly find, the output varies with a given A/F ratio if the EGT chnages. However, it seems that a single sensor has a decent repeatability.

A) Exhaust gas at 500 C
B) Exhaust gas at 750 C
C) Exhaust gas at 900 C

<img src="http://www.ffp-motorsport.com/tuning/o2/ffplambda.gif">

scalbert

NB bites for trying to tune or diagnose unless previously compared to a WB. Or at least that is what I have found during my last 13+ years of wrenching and tuning. Dang, I am getting old!!!

RobC

Here's mine from the same night with AWE i/c's. It was a few degrees cooler, but that shouldn't account for the difference. My fogs are out and his aren't--but others have proved that this didn't help?

<img src="http://maxhawk.flagshiphosting.com/car/ecux/021207/index_files/Typical-3-27-2006_8-22-40_AM_v2_p0t_vs_p3t_40f_29519_image007.gif">

Flyboy

the air passing through the core is a huge driver in determining how much heat is taken away. Also, what was your time? If the car is taking 4.26-5.38 seconds to complete the FATS there is significantly more time for the IC to heat up versus a car that is in the 3.9 second range. The reason the IAT curves upward is because as the mass flow of hot air increases, the IC's capacity to absorb and shed off the heat is exceeded. The more time spent in a sort of heat 'overload' condition, the more the IAT will rise.

Flyboy

whole combustion process gets started late. It then ends late. Instead of the heat energy doing what it's supposed to and pushing the piston down it goes into the cylinder walls and heats things up. That leads to even higher temps as long as the heavy load condition exists. Also, the burning process may still be happening when the exhaust valves open, sending very hot gasses out.

I would guess that the poor timing advance is a part of the reason the EGT's are high.