Installed cam and tuned. Idle shakes a little only with AC ON. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

eLeSthree · 01-03-2023, 05:58 AM

So I just installed a BTR centri cam in my friends car, and I tuned it. I added airflow to the usual tables and raised the target RPM. It fired right up and idled great. But it was adding 28% fuel at idle. So i knew the tune was off.

Then I disabled all fuel modifiers, like DFCF/CFCO, LTFTs, O2 sensors, COT, and added 20% to the entire MAF table. Flashed it, logged it, pulled fuel, rinse and repeat 5 times. Even without the LTFTs its spot on. So I turned everything back on, and fuel trims are within 3-4%, WOT is right on .85 (ethanol) and it runs excellent.

Then we turned the AC on... and the idle got a little shakey. Doesnt stall or anything, just a noticeable difference in idle quality.

I see there are 2 tables in Engine>Idle>Airflow>AC Ramp In and Out.
However I dont know what they do.

Has anyone modified these to iimprove idle after a camshaft install?

dreksnot · 01-03-2023, 12:01 PM

I had to modify mine with my cam and cubes. I added quite a bit, nearly double what the stock values were.

This is what I added on top of the LS3 stock values so it wouldn't die or surge at idle with the AC cycling.

eLeSthree · 01-03-2023, 12:35 PM

Quote:

Originally Posted by dreksnot

I had to modify mine with my cam and cubes. I added quite a bit, nearly double what the stock values were.

This is what I added on top of the LS3 stock values so it wouldn't die or surge at idle with the AC cycling.

Thanks, I'll give that a try. i also heard of zero'ing out the timing in the Torque Management>Ac Torque field. So it cant pull timing when the ac kicks on.

I'll report back!

eLeSthree · 01-10-2023, 10:02 AM

So far I have tried adding those values just as you have. I've tried doubling and even tripling the stock values. Ive also tried zeroing both of those tables. (did not like zero)

I've also zero'd the torque management AC spark table that pulls timing.

Best result so far is with the ramp in/out values tripled. It's not terrible or stalling, its just a slightly shakey idle. Like its had too many energy drinks. Slightly better now, but not perfect.

dreksnot · 01-10-2023, 09:31 PM

Have you tried mucking with your Throttle Follower Torque table since you cammed it?

JANNETTYRACING · 01-11-2023, 11:34 AM

The racoon is in the other tree guys.

tartagliazl1 · 01-11-2023, 03:41 PM

Quote:

Originally Posted by JANNETTYRACING

The racoon is in the other tree guys.

seems like Ted is dropping cryptic hints guys.

eLeSthree · 01-12-2023, 03:39 AM

Quote:

Originally Posted by JANNETTYRACING

The racoon is in the other tree guys.

Ok, barking up the wrong tree. Got it. I know you know how to fix it, and I also know you don't run a successful business by giving out your tuning knowledge for free. So I thank you for the course correction.

care to give a one word hint??

JANNETTYRACING · 01-18-2023, 12:52 PM

Quote:

Originally Posted by eLeSthree

Ok, barking up the wrong tree. Got it. I know you know how to fix it, and I also know you don't run a successful business by giving out your tuning knowledge for free. So I thank you for the course correction.

care to give a one word hint??

VE

eLeSthree · 01-19-2023, 05:09 AM

Quote:

Originally Posted by JANNETTYRACING

VE

Awesome. Thanks Ted!

01-03-2023, 05:58 AM	#1
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,905	Installed cam and tuned. Idle shakes a little only with AC ON. So I just installed a BTR centri cam in my friends car, and I tuned it. I added airflow to the usual tables and raised the target RPM. It fired right up and idled great. But it was adding 28% fuel at idle. So i knew the tune was off. Then I disabled all fuel modifiers, like DFCF/CFCO, LTFTs, O2 sensors, COT, and added 20% to the entire MAF table. Flashed it, logged it, pulled fuel, rinse and repeat 5 times. Even without the LTFTs its spot on. So I turned everything back on, and fuel trims are within 3-4%, WOT is right on .85 (ethanol) and it runs excellent. Then we turned the AC on... and the idle got a little shakey. Doesnt stall or anything, just a noticeable difference in idle quality. I see there are 2 tables in Engine>Idle>Airflow>AC Ramp In and Out. However I dont know what they do. Has anyone modified these to iimprove idle after a camshaft install? __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

01-03-2023, 12:01 PM	#2
dreksnot Served USN - Atomic Chimp Drives: 2021 Camaro ZL1 1LE A10 (stock) Join Date: Jul 2012 Location: Fort Collins, CO Posts: 1,617 View My Garage	I had to modify mine with my cam and cubes. I added quite a bit, nearly double what the stock values were. This is what I added on top of the LS3 stock values so it wouldn't die or surge at idle with the AC cycling. Attached Images __________________ In excess of 1,000WHP LSX434 \| AGP 65/65 TT \| BTR Equalizer Intake \| Trickflow 245cc cathedral \| BTR custom cam \| Cortex EBC \| n2mb WOT \| ID-1700x \| Brisk GR12S \| RPM Lv 7 TR6060 \| AGP's Triple 525LPH Fore Fuel \| Monster LT1-S Triple \| 4.11 DSS Proform 9", CF driveshaft, 1400hp axles \| Hurst Line Lock \| MGW Retro Short Throw w/old skool Hurst T-handle \| ADM solid subframe mounts \| Prothane Motor Mounts \| Revshift Poly Trans insert \| Moreno camber/caster plates

01-10-2023, 10:02 AM	#4
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,905	So far I have tried adding those values just as you have. I've tried doubling and even tripling the stock values. Ive also tried zeroing both of those tables. (did not like zero) I've also zero'd the torque management AC spark table that pulls timing. Best result so far is with the ramp in/out values tripled. It's not terrible or stalling, its just a slightly shakey idle. Like its had too many energy drinks. Slightly better now, but not perfect. __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

01-10-2023, 09:31 PM	#5
dreksnot Served USN - Atomic Chimp Drives: 2021 Camaro ZL1 1LE A10 (stock) Join Date: Jul 2012 Location: Fort Collins, CO Posts: 1,617 View My Garage	Have you tried mucking with your Throttle Follower Torque table since you cammed it? Attached Images __________________ In excess of 1,000WHP LSX434 \| AGP 65/65 TT \| BTR Equalizer Intake \| Trickflow 245cc cathedral \| BTR custom cam \| Cortex EBC \| n2mb WOT \| ID-1700x \| Brisk GR12S \| RPM Lv 7 TR6060 \| AGP's Triple 525LPH Fore Fuel \| Monster LT1-S Triple \| 4.11 DSS Proform 9", CF driveshaft, 1400hp axles \| Hurst Line Lock \| MGW Retro Short Throw w/old skool Hurst T-handle \| ADM solid subframe mounts \| Prothane Motor Mounts \| Revshift Poly Trans insert \| Moreno camber/caster plates

01-11-2023, 11:34 AM	#6
JANNETTYRACING Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009 Location: ON THE DYNO WATERBURY CT. Posts: 15,230	The racoon is in the other tree guys. __________________ www.jannettyracing.com Celebrating 37 years Performance parts, Installation, Fabrication, Dyno tuning, Remote custom tuning, and alignments. 203-753-7223 Waterbury CT. 06705 email tedj@jannettyracing.com