ac idle tuning...

Reply Subscribe

Thread Tools

Search this Thread

Sep 30, 2005 | 12:39 AM

Michael Ozorowsky

Thread Starter

TECH Resident

iTrader: (1)

Joined: Apr 2003

Posts: 798

Likes: 0

From: Tampa, FL

ac idle tuning...

Regular idle, STIT/LTIT A/C Off is right at 0 to -.08 or so. I turn on AC and ac offset or whatever it's called shows 1.67 or so. How do I adjust the ac at idle to be more in line with what it should be? What table do I modify, like with ac off I modify raf. Thank you.

Sep 30, 2005 | 09:45 AM

Patrick G

LS1 Tech Administrator

iTrader: (14)

Joined: Nov 2001

Posts: 8,246

Likes: 34

From: Victoria, TX

More than likely, your IAC Effective Area is not set correctly with the AC on. You want your dynamic air and your desired idle air to match even with the AC engaged. If that looks good, then look to increase the learning limits to +3 g/sec and -1 g/sec. If that still doesn't do the trick, trying increasing your fan speed corrections and if all else fails, look at increasing AC torque (in the torque management section of HPT).

__________________

2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.

Sep 30, 2005 | 09:13 PM

Michael Ozorowsky

Thread Starter

TECH Resident

iTrader: (1)

Joined: Apr 2003

Posts: 798

Likes: 0

From: Tampa, FL

how do I know how much to increase AC Torque? Also right now my AC offset min in gear is 0.00 and AC offset max in gear is .50 is that not right?

Also I have all tq management disabled. Does that matter?

Oct 1, 2005 | 12:22 AM

Patrick G

LS1 Tech Administrator

iTrader: (14)

Joined: Nov 2001

Posts: 8,246

Likes: 34

From: Victoria, TX

You'll probably have more luck by adding +3 to the upper end of the idle learning and -1 for the lower end of idle learning. For now, I would leave AC torque alone until you can try the easy things first.

Oct 1, 2005 | 03:15 AM

RedHardSupra

TECH Fanatic

iTrader: (1)

Joined: Sep 2003

Posts: 1,904

Likes: 2

From: Laurel, MD

how about monitoring the 'calculated torque'? i watched it once, and it would go up when i turn on the AC. subtract ON-OFF values and you should know how much torque gets eaten up by AC, at least according to the pcm.

Oct 1, 2005 | 03:18 AM

Michael Ozorowsky

Thread Starter

TECH Resident

iTrader: (1)

Joined: Apr 2003

Posts: 798

Likes: 0

From: Tampa, FL

I'm a noob, where do I find idle learning? What is that exactly called? Also, is calculated torque a PID? Where is it located? I'll check for it in morning.

Oct 1, 2005 | 07:29 AM

Bink

TECH Addict

Joined: Jul 2002

Posts: 2,261

Likes: 0

Quote:

Originally Posted by Michael Ozorowsky

I'm a noob, where do I find idle learning? What is that exactly called? Also, is calculated torque a PID? Where is it located? I'll check for it in morning.

Go To->
Engine-> Idle Airflow-> Adaptive Idle Airflow Limits-> AC Offset Min - In Gear,
AC Offset Max - In Gear

There are two PIDS;
Delivered Engine Torque
Desired Engine Torque