BOV sound??? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

TR_Iceman · 05-22-2018, 02:20 AM

Hey guys quick question. I have a 2014 ss camaro with a single turbo 84mm on3 turbo. I was wondering why I don't hear my BOV open when I rev in neutral? Even at read line, no sound.

blake-b · 05-22-2018, 03:42 AM

There is no load on the engine when the trans is in neutral. The turbo won't make boost without a load therefore, there is no boost being sent to the engine. Since there is no boost, there is no reversion of air back towards the BOV when the throttle body shuts to make the sound.

eLeSthree · 05-22-2018, 09:55 AM

Put on a tiny turbo and itll make boost in nuetral. Lol

TR_Iceman · 05-22-2018, 03:51 PM

Thanks for the reply guys. But I still don't get it?? The only difference between neutral and driving is my trans being in gear right? What does that have to do with the engine? On the road at 3000 rpm I'm making boost but from a neutral rev I make nothing?

jeff657756 · 05-23-2018, 06:47 AM

Quote:

Originally Posted by TR_Iceman

Thanks for the reply guys. But I still don't get it?? The only difference between neutral and driving is my trans being in gear right? What does that have to do with the engine? On the road at 3000 rpm I'm making boost but from a neutral rev I make nothing?

There is no load in neutral on the engine. These aren't Focus ST's lol.

dreksnot · 05-23-2018, 09:51 AM

Quote:

Originally Posted by jeff657756

There is no load in neutral on the engine. These aren't Focus ST's lol.

RankSS · 05-23-2018, 10:50 AM

Load is needed to get exhaust pressure which in turn spins the turbo.

JD555 · 05-24-2018, 06:41 PM

Your not running any air thru the engine in neutral. You may be revving but the throttle body is not open like a wide open pull. You have to have exhaust pressure to spin the turbo (moving a lot of air) cant do it in neutral. Might get some turbo spin but not like a full power pull.

TR_Iceman · 05-25-2018, 03:07 PM

Quote:

Originally Posted by JD555

Your not running any air thru the engine in neutral. You may be revving but the throttle body is not open like a wide open pull. You have to have exhaust pressure to spin the turbo (moving a lot of air) cant do it in neutral. Might get some turbo spin but not like a full power pull.

How could I not be running any air thur the engine when I revving in neutral? Wouldn't the engine stall? I was in the parking lot the other day and a guy asked to hear what my car sounded like. I started her up for him. "Rev it up" he yelled. So I did. Then I thought there has to be some kind of turbo spool with all of the exhast that just screamed thru my pipee. Not understanding???

gtstorey · 05-25-2018, 03:24 PM

The engine is not doing much work so not moving nearly as much air/fuel through at the same rpm.

dreksnot · 05-25-2018, 05:10 PM

First Image (left) is Full Throttle with the clutch in - (motor is UNLOADED)

Second Image (right) is Full Throttle, clutch engage - (motor is LOADED)

See the big difference in the MAF Cyl Air (g) and MAF (Mass AirFlow) sensor reading differences.

UNLOADED you're not going to get the turbos to spool (also see the orange Boost numbers - kinda speaks for itself [0.6psi boost UNLOADED versus 14.7psi boost LOADED). No boost in the charge pipe (intake) when the throttle goes shut (no need for the BOV to release pressure so it doesn't open); a lot of boost in the pipe when the throttle goes shut (big WHOOSH because the BOV is releasing boost from the charge pipe).

TR_Iceman · 05-27-2018, 04:54 AM

OOOHHHH!!! dreksnot.. You just made my day. Now I fully understand!

05-22-2018, 02:20 AM	#1
TR_Iceman Drives: 2014 camaro 2SS/ RS/ 6 speed Join Date: Jun 2017 Location: East Stroudsburg Pa Posts: 7	BOV sound??? Hey guys quick question. I have a 2014 ss camaro with a single turbo 84mm on3 turbo. I was wondering why I don't hear my BOV open when I rev in neutral? Even at read line, no sound.

05-22-2018, 09:55 AM	#3
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,904	Put on a tiny turbo and itll make boost in nuetral. Lol __________________ 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...

05-23-2018, 10:50 AM	#7
RankSS Drives: 2010 Camaro SS Join Date: Oct 2013 Location: Saskatoon SK Can. Eh Posts: 365	Load is needed to get exhaust pressure which in turn spins the turbo. __________________ 2010 Camaro SS RS, Maggie with 3.4" pulley, 60# injectors, ADM dual fuel pumps, ADM Stage 2 Cam with Brian Tooley springs and pushrods, black CAI intake, Stainless Works long tube headers w/gutted cats, ZL1 Diff w/offset bushings, Pfadt lowering springs, Pfadt sway bars, Pfadt solid sub frame mounts, BMR trailing arms and toe rods, Hurst short throw shifter, Painted on Hugger Orange stripes, Forgestar F14 Piano Black wheels, Nitto NT05 rubber.

05-25-2018, 05:10 PM	#11
dreksnot Served USN - Atomic Chimp Drives: 13 Camaro LSX434 TT M6, 21 ZLE A10 Join Date: Jul 2012 Location: Fort Collins, CO Posts: 1,603 View My Garage	First Image (left) is Full Throttle with the clutch in - (motor is UNLOADED) Second Image (right) is Full Throttle, clutch engage - (motor is LOADED) See the big difference in the MAF Cyl Air (g) and MAF (Mass AirFlow) sensor reading differences. UNLOADED you're not going to get the turbos to spool (also see the orange Boost numbers - kinda speaks for itself [0.6psi boost UNLOADED versus 14.7psi boost LOADED). No boost in the charge pipe (intake) when the throttle goes shut (no need for the BOV to release pressure so it doesn't open); a lot of boost in the pipe when the throttle goes shut (big WHOOSH because the BOV is releasing boost from the charge pipe). 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

05-22-2018, 03:42 AM	#2
blake-b Drives: 2009 ZR1 Join Date: May 2010 Location: KCMO Posts: 3,205	There is no load on the engine when the trans is in neutral. The turbo won't make boost without a load therefore, there is no boost being sent to the engine. Since there is no boost, there is no reversion of air back towards the BOV when the throttle body shuts to make the sound.

05-22-2018, 03:51 PM	#4
TR_Iceman Drives: 2014 camaro 2SS/ RS/ 6 speed Join Date: Jun 2017 Location: East Stroudsburg Pa Posts: 7	Thanks for the reply guys. But I still don't get it?? The only difference between neutral and driving is my trans being in gear right? What does that have to do with the engine? On the road at 3000 rpm I'm making boost but from a neutral rev I make nothing?

05-24-2018, 06:41 PM	#8
JD555 Drives: 2014 2SS RS, 6 sp man Join Date: Feb 2016 Location: Marlton, NJ Posts: 461	Your not running any air thru the engine in neutral. You may be revving but the throttle body is not open like a wide open pull. You have to have exhaust pressure to spin the turbo (moving a lot of air) cant do it in neutral. Might get some turbo spin but not like a full power pull.

05-25-2018, 03:24 PM	#10
gtstorey Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017 Location: Huntsville, AL Posts: 2,149	The engine is not doing much work so not moving nearly as much air/fuel through at the same rpm.

05-27-2018, 04:54 AM	#12
TR_Iceman Drives: 2014 camaro 2SS/ RS/ 6 speed Join Date: Jun 2017 Location: East Stroudsburg Pa Posts: 7	OOOHHHH!!! dreksnot.. You just made my day. Now I fully understand!