Heartbeat hesitation - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

hunter1660 · 05-11-2018, 10:09 PM

2011 L99 with heartbeat installed a year and 3000 miles ago. Ran flawlessly until a week or so ago. From a dead stop it was instant boost with the omg factor. Now...from a dead stop it leaves like its stock...for about a second,maybe 2..it then gets into boost..What's causing the delay,hesitation? I pulled the bypass actuator off and it holds vacuum. I looked for possible leaks,holes in vacuum lines and don't see anything obvious. Anyone have any insight? Thx

UBB · 05-12-2018, 09:22 AM

Mine doesn't "kick in" until about 3500 RPM. I'm assuming that's how it is supposed to run but I have nothing to compare it to.

hunter1660 · 05-12-2018, 10:10 AM

It should be instant from off idle when floored with near zero hesitation. Yours sounds like it suffers from something similar to mine.

1911 1LE · 05-12-2018, 10:32 AM

Do either of you hear a fluttering noise and feel a slight vibration. I know of one that's doing this and was sent back to Magnuson.

UBB · 05-12-2018, 12:42 PM

Quote:

Originally Posted by 1911 1LE

Do either of you hear a fluttering noise and feel a slight vibration. I know of one that's doing this and was sent back to Magnuson.

No vibration with mine. Like I said mine feels completely stock until I get on it and you can really feel the boost come in around 3500 RPM.

hunter1660 · 05-12-2018, 05:12 PM

Works like it should except for the delay. I've pretty much eliminated a vacuum problem as the actuator functions as it should at start up. Pull vacuum hose off and engine runs rough do to unmetered air. The search goes on.

jravenfan · 05-13-2018, 05:51 PM

Could it be belt slippage?

jravenfan · 05-13-2018, 05:53 PM

Quote:

Originally Posted by UBB

Mine doesn't "kick in" until about 3500 RPM. I'm assuming that's how it is supposed to run but I have nothing to compare it to.

I was under the impression that the advantage of a PD blower is near instant power?

hunter1660 · 05-13-2018, 08:07 PM

It should be instant on demand. Under normal driving the car runs like stock. You'd not know that it's supercharged. There's a bypass with a vacuum operated actuator. Today I unplugged the bypass and corked off the vacuum inlet. In essence,theory making it supercharged full time trying to see if that was the root of my problem. No such luck. From a stop, floor it and it leaves like its stock for a couple seconds, then the wow factor " kicks in " I thought maybe the map sensor? But the car doesn't show that as the problem,from what I've Been reading. Maybe it is the belt. I emailed magnuson and wait for them to respond.

hunter1660 · 05-26-2018, 06:52 PM

Found the problem. Not sure why it took a year to manifest. I bought a laptop to log with..HP Stream..for a couple hundred bucks..new.. Held the stabilitrac nannies button to turn that off,started the log and floored it. Instant response without any lag. Actually I believe it's better than before. Run fine for a year without turning them off. Who'd of thunk it

10aSSee D · 05-26-2018, 08:46 PM

For sure have the nannies off when getting on it, it will stumble and hesitate because you are loosing traction.

05-11-2018, 10:09 PM	#1
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	Heartbeat hesitation 2011 L99 with heartbeat installed a year and 3000 miles ago. Ran flawlessly until a week or so ago. From a dead stop it was instant boost with the omg factor. Now...from a dead stop it leaves like its stock...for about a second,maybe 2..it then gets into boost..What's causing the delay,hesitation? I pulled the bypass actuator off and it holds vacuum. I looked for possible leaks,holes in vacuum lines and don't see anything obvious. Anyone have any insight? Thx __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners

05-12-2018, 10:10 AM	#3
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	It should be instant from off idle when floored with near zero hesitation. Yours sounds like it suffers from something similar to mine. __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners

05-12-2018, 10:32 AM	#4
1911 1LE Drives: 2015 SW 2SS 1LE Join Date: Jan 2018 Location: 78155 Posts: 310	Do either of you hear a fluttering noise and feel a slight vibration. I know of one that's doing this and was sent back to Magnuson. __________________ Maggie 2650 @ 18psi/ 75mm 10 rib/ Dual alky nozzles/ Roto-fab/ ARH 2" Lt's/ GT-12 cam/ ZL1 3.23 Conv./MGW/RPS triple carbon clutch/RSG tranny upgrage/Pedders Ex. XA w/ remote cans and a lot of other crap 897/8??@tires

05-12-2018, 05:12 PM	#6
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	Works like it should except for the delay. I've pretty much eliminated a vacuum problem as the actuator functions as it should at start up. Pull vacuum hose off and engine runs rough do to unmetered air. The search goes on. __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners

05-13-2018, 05:51 PM	#7
jravenfan Drives: 2013 2SS Blue Ray Metallic Join Date: May 2013 Location: Eldersburg MD Posts: 377	Could it be belt slippage? __________________

05-12-2018, 09:22 AM	#2
UBB Drives: 2018 ZL1 Join Date: Jun 2016 Location: Bismarck Posts: 572 View My Garage	Mine doesn't "kick in" until about 3500 RPM. I'm assuming that's how it is supposed to run but I have nothing to compare it to.

05-13-2018, 08:07 PM	#9
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	It should be instant on demand. Under normal driving the car runs like stock. You'd not know that it's supercharged. There's a bypass with a vacuum operated actuator. Today I unplugged the bypass and corked off the vacuum inlet. In essence,theory making it supercharged full time trying to see if that was the root of my problem. No such luck. From a stop, floor it and it leaves like its stock for a couple seconds, then the wow factor " kicks in " I thought maybe the map sensor? But the car doesn't show that as the problem,from what I've Been reading. Maybe it is the belt. I emailed magnuson and wait for them to respond. __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners

05-26-2018, 06:52 PM	#10
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	Found the problem. Not sure why it took a year to manifest. I bought a laptop to log with..HP Stream..for a couple hundred bucks..new.. Held the stabilitrac nannies button to turn that off,started the log and floored it. Instant response without any lag. Actually I believe it's better than before. Run fine for a year without turning them off. Who'd of thunk it __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners

05-26-2018, 08:46 PM	#11
10aSSee D Drives: Silver 2010 SS Camaro Join Date: Jul 2009 Location: TN Posts: 2,562	For sure have the nannies off when getting on it, it will stumble and hesitate because you are loosing traction. __________________ MODS: ADM built 417, 2.9L Whipple with 3.250 pulley, ADM ported and polished LSA heads,ADM stage3 cam,ADM LSA belt drive system,ADM CAI race scoop, ADM dual fuel pumps, ID 850's, BMR full suspension, Gforce 9 inch kit with 3.5 inch driveshaft, Street Slayer twin carbon clutch, Lingenfelter oil seperator. Tuned by built by ADM Performance, 763rwhp,705rwtq