Idle Tuning/Sorry its long - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Gordy87 · 09-23-2020, 08:24 AM

Ok guys, again its been a good while since I was active on the forum. Little rundown, back in fall of last year I upgraded my cam from the previous small cam to another "smaller slightly larger" cam. Everything went great and ran awesome for a small cam car. Fast forward to around 1st of the year and started having some issues, fought and fought with tuning and inspecting things to finally find out basically had blown both head gaskets. So now that everything is back together and running, I have been trying to do some research when time permits, but with 4 kids and being "essential" as they tend to call us now days, I haven't had a lot of success, but I am having an issue with the idle and best way to describe it is that at idle only when car is 1st started and warming up, the rpm's will climb to around 1200 to 1300 rpm when clutch is pushed in during a rolling stop even when letting the car idle for about 2 minutes before actually moving. Also it will idle great and not fluctuate at all, until the a/c or heat is actually running, then it will surge, but only when clutch is pushed in and sitting or coming to a stop. An idea's what to look for in HPTuners to possibly adjust/correct these slight issues? I,ve seen on HPT forum where some people show a/c on/off rpm items, but for my tune I am not seeing any of those things??

Gordy87 · 09-24-2020, 08:57 AM

Nothing??

larry_g · 09-24-2020, 09:27 AM

Mine has done something similar coming to a stop as long as I've owned it but not quite that big of a bump in rpm (A/C doesn't make a difference), I just figured it was normal for these.

RobZL1 · 09-24-2020, 12:47 PM

Assuming it's nothing mechanical and is actually in the tune:

Could be the "In Gear" overspeed/underpeed spark tables causing the surge.
Could be the Idle spark vs Coastdown spark tables causing the rise.
Could be the Min Idle Airflow causing or contributing to both issues.
Proportional and Integral air could be causing havoc if they've been moved to extremes.

If it's a small cam, you should be able to get it to work pretty well with all stock idle settings, except for increasing the idle speed by maybe 250 rpm and increasing the min airflow table by maybe 3 g/s.

Without a log, I'd probably start with those settings to rule things out.

Gordy87 · 09-29-2020, 06:33 PM

Cams a 226/232 .57*/58* 112lsa. It idles great when sitting still cold or warm, it's only after starting off for say 1st 5min of driving that the rpm's rev and idle surges until it comes to a complete stop, the it settles in. But then when driving, even if its extended driving, with the a/c on it surges when clutch is engaged or drops to idle. I can pull some logs, but should I include anything in particular? I tried to attached a couple logs from back in June, but giving me an error. I am still trying to interpret the data myself. I will also dive into the items you listed. Thanks for the input RobZL1

eLeSthree · 10-12-2020, 12:50 PM

They wont let you post logs on this forum. What were the old cam specs? Cant just go by lift or duration. My old cam had low lift and duration, but was a 110, and it needed alot of additional airflow. I agree with Rob above. Those are the most common settings to fix idle behavior due to a cam change. Mainly the Base Running Airflow/Airflow Minimum table. Compare it to your stock tune to see how much was changed. You might have too much actually, depends what the old cam wanted.

HOJO · 10-12-2020, 02:06 PM

eLe, why can’t you post logs on here? I never heard this one. But sometimes my attention span is small. I guess I’m not seeing the issue with it.

eLeSthree · 10-12-2020, 02:48 PM

Quote:

Originally Posted by HOJO

eLe, why can’t you post logs on here? I never heard this one. But sometimes my attention span is small. I guess I’m not seeing the issue with it.

You’ll have to ask a moderator. The file type is not accepted.

Gordy87 · 10-15-2020, 04:17 PM

Sorry guys, I guess my notifications still arent working. The old cam was an 219/228 .553/.551 on a 113 lsa.

09-23-2020, 08:24 AM	#1
Gordy87 Drives: 2010 Camaro SS Join Date: Oct 2016 Location: Georgia Posts: 300 View My Garage	Idle Tuning/Sorry its long Ok guys, again its been a good while since I was active on the forum. Little rundown, back in fall of last year I upgraded my cam from the previous small cam to another "smaller slightly larger" cam. Everything went great and ran awesome for a small cam car. Fast forward to around 1st of the year and started having some issues, fought and fought with tuning and inspecting things to finally find out basically had blown both head gaskets. So now that everything is back together and running, I have been trying to do some research when time permits, but with 4 kids and being "essential" as they tend to call us now days, I haven't had a lot of success, but I am having an issue with the idle and best way to describe it is that at idle only when car is 1st started and warming up, the rpm's will climb to around 1200 to 1300 rpm when clutch is pushed in during a rolling stop even when letting the car idle for about 2 minutes before actually moving. Also it will idle great and not fluctuate at all, until the a/c or heat is actually running, then it will surge, but only when clutch is pushed in and sitting or coming to a stop. An idea's what to look for in HPTuners to possibly adjust/correct these slight issues? I,ve seen on HPT forum where some people show a/c on/off rpm items, but for my tune I am not seeing any of those things??

09-24-2020, 09:27 AM	#3
larry_g Drives: 2014 1SS/1LE Join Date: Nov 2015 Location: Louisville, KY Posts: 826	Mine has done something similar coming to a stop as long as I've owned it but not quite that big of a bump in rpm (A/C doesn't make a difference), I just figured it was normal for these. __________________ 830 WHP 700 WTQ, Whipple 2.9 @ 13lbs Boost, Flex Fuel Tune by Blevins Tuning, LSA SBE, 3.5 GripTec, ATI LS3 Damper, AFR 260cc Mongoose, ARP Studs, Yella Terra Ultralites, Johnson 2110R, BTR PDS Stage 3, Melling 10355, Improved Racing Baffle, ID1050X, DSX Triple Fuel Pump, RotoFab CAI, NW 103mm TB, Stainless Works 1-7/8" LTH to 3" Speed Eng w/ X-pipe to NPP, Powermaster 9509 XS, Detroit Speed Motor Mounts, MGW, Monster LT1-S, ZL1 Calipers, DBA Rotors & Pads, Bilstein B6 Struts & Shocks, BMR 1.25" Drop Springs & Adj Rear Bar, Pegasus Solid Bushings, Z/28 Wheels, other misc parts.

09-24-2020, 12:47 PM	#4
RobZL1 fo'shizZL1 Drives: 2017 ZL1 Join Date: Aug 2017 Location: ATL Posts: 1,281	Assuming it's nothing mechanical and is actually in the tune: Could be the "In Gear" overspeed/underpeed spark tables causing the surge. Could be the Idle spark vs Coastdown spark tables causing the rise. Could be the Min Idle Airflow causing or contributing to both issues. Proportional and Integral air could be causing havoc if they've been moved to extremes. If it's a small cam, you should be able to get it to work pretty well with all stock idle settings, except for increasing the idle speed by maybe 250 rpm and increasing the min airflow table by maybe 3 g/s. Without a log, I'd probably start with those settings to rule things out. __________________ 2017 ZL1 M6 Black \| Maggie 2650 // 103TB // Big Gulp Past Rides- 2014 ZL1 M6 Red Hot \| Tons of mods 2004 CTS-V M6 Silver \| Many mods 1995 Corvette M6 Torch Red \| A few more mods 1992 Camaro M5 White \| A few mods

09-29-2020, 06:33 PM	#5
Gordy87 Drives: 2010 Camaro SS Join Date: Oct 2016 Location: Georgia Posts: 300 View My Garage	Cams a 226/232 .57/58 112lsa. It idles great when sitting still cold or warm, it's only after starting off for say 1st 5min of driving that the rpm's rev and idle surges until it comes to a complete stop, the it settles in. But then when driving, even if its extended driving, with the a/c on it surges when clutch is engaged or drops to idle. I can pull some logs, but should I include anything in particular? I tried to attached a couple logs from back in June, but giving me an error. I am still trying to interpret the data myself. I will also dive into the items you listed. Thanks for the input RobZL1 Last edited by Gordy87; 09-29-2020 at 06:55 PM.

10-12-2020, 12:50 PM	#6
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,904	They wont let you post logs on this forum. What were the old cam specs? Cant just go by lift or duration. My old cam had low lift and duration, but was a 110, and it needed alot of additional airflow. I agree with Rob above. Those are the most common settings to fix idle behavior due to a cam change. Mainly the Base Running Airflow/Airflow Minimum table. Compare it to your stock tune to see how much was changed. You might have too much actually, depends what the old cam wanted. __________________ 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...

09-24-2020, 08:57 AM	#2
Gordy87 Drives: 2010 Camaro SS Join Date: Oct 2016 Location: Georgia Posts: 300 View My Garage	Nothing??

10-12-2020, 02:06 PM	#7
HOJO Drives: 2014 Camaro SS/RS 1LE 1967 Camaro Join Date: Oct 2013 Location: Fort Wayne, IN Posts: 873	eLe, why can’t you post logs on here? I never heard this one. But sometimes my attention span is small. I guess I’m not seeing the issue with it.

10-15-2020, 04:17 PM	#9
Gordy87 Drives: 2010 Camaro SS Join Date: Oct 2016 Location: Georgia Posts: 300 View My Garage	Sorry guys, I guess my notifications still arent working. The old cam was an 219/228 .553/.551 on a 113 lsa.