Boost Gauge reading is off - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Valkyrie14 · 02-11-2021, 07:31 PM

I just installed a boost gauge and I don’t think it is reading properly. It drops below zero when driving all the way down to 20 and 10. When I get on it the gauge barely goes to 0. What’s up?

larry_g · 02-12-2021, 06:20 AM

Are you tapped into the right location? it sounds like you have a vacuum line.

Sent from my Pixel 5 using Tapatalk

Valkyrie14 · 02-12-2021, 11:05 AM

Quote:

Originally Posted by larry_g

Are you tapped into the right location? it sounds like you have a vacuum line.

Sent from my Pixel 5 using Tapatalk

Could be. My Hobbs, fuel regulator and gauge all are off a line on the boost actuator on the front of the blower.

Bo White · 02-12-2021, 11:45 AM

Mine was always off. I went to an Aeroforce to read through the OBD2 since I had a 3 bar map and never looked back.

Valkyrie14 · 02-12-2021, 04:12 PM

Quote:

Originally Posted by Bo White

Mine was always off. I went to an Aeroforce to read through the OBD2 since I had a 3 bar map and never looked back.

I already have my AFR plugged into the OBD. I looked at AEM’s boost gauge it has a pigtail but not sure what it plugs into

Valkyrie14 · 02-15-2021, 09:48 PM

I did some re-routing of the boost lines today. I had a T on the hose that runs the boost actuator. The line is now right off of the stem that comes off of the blower right behind the actuator. No change in the reason on the glow shift boost gauge. Considering an AEM boost gauge.

Whitlow · 02-16-2021, 03:45 PM

Mine read the same while driving down the road but when I'm into it the boost goes to 7 which is where mine should be. I think my gauge is right and it's like it should be.

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Valkyrie14 · 02-16-2021, 10:02 PM

Quote:

Originally Posted by Whitlow

Mine read the same while driving down the road but when I'm into it the boost goes to 7 which is where mine should be. I think my gauge is right and it's like it should be.

Sent from my SM-G781U1 using Tapatalk

My gauge never goes above 0. When I have my HP logging I see that I go into boost and my tuner says my blower is working. Before I sped $180 on a boost gauge I want to make sure I have it set up right. This gauge hasn’t gone above 0 not once, I was at about 5,000 rpms in 2cd gear getting on the highway and it barely got to 0. I’m pretty sure I was around 7-10 psi at that moment.

larry_g · 02-17-2021, 06:24 AM

Still sounds like a vacuum line. Do you have pics of where everything is tapped in and T off?

I'm not as familiar with the LSA blower, but on the whipple, the actuator is vacuum operated ( before the rotors). I tapped my boost gauge from the plenum under the rotors.

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larry_g · 02-17-2021, 08:56 AM

https://www.ctsvowners.com/threads/b...roblems.38468/

Valkyrie14 · 02-17-2021, 09:50 AM

Here are pics of my setup. First 2 pics show my lines coming off of the blower. The upper stem is the line that runs to the regulator, Hobbs and boost gauge. The lower stem runs to the front upper inlet of the actuator. I have the lower inlet on the actuator is capped off. I noticed on the pics of the CTS V and pics I have seen on ZL1 there is a whole other sensor below the actuator that I don’t have. Please help me sort this out.

TheFlyingBananaSS · 02-17-2021, 10:10 AM

Mine is tapped into the brake booster line. It was near perfect with the dyno. It's an AEM boost gauge. The glowshift are known to be slightly less accurate. You should be seeing boost psi once you are in it. Reading zero is likely from connected wrong spot.

larry_g · 02-17-2021, 10:35 AM

I have to agree that it looks like you are tapped into the correct location.

Have you been able to confirm that the Hobbs switch is actually seeing boost and working and that the fuel pressure is holding steady?

Is it possible that the FPR or one of the fittings is bleeding off boost pressure?

Is it possible the bypass valve is not closing and you aren't actually getting into boost?

Process of elimination would say the gauge may be bad but it seems odd that the vacuum reading works but the boost doesn't.

TheFlyingBananaSS · 02-17-2021, 10:41 AM

Maybe a one way valve in the wrong spot?

02-11-2021, 07:31 PM	#1
Valkyrie14 Valkyrie14 Drives: Chevrolet Camaro SS Join Date: Mar 2020 Location: Eau Claire, Wisconsin Posts: 962	Boost Gauge reading is off I just installed a boost gauge and I don’t think it is reading properly. It drops below zero when driving all the way down to 20 and 10. When I get on it the gauge barely goes to 0. What’s up? Attached Images __________________ 2014 SS LS3/LSA Supercharger, 10% Super Damper, 2.55 upper, AGP Dual Pump, ID 1050 injectors, Pegasus solid rear cradle bushings, LT Headers, Roto-Fab CAI, Elite E2 catch can, E85 corn fed, 160 Thermostat, Monster Twin Disk, MGW Short Throw shifter, Tick Clutch Master Cylinder, HP Tuners, JL Audio system.

02-12-2021, 06:20 AM	#2
larry_g Drives: 2014 1SS/1LE Join Date: Nov 2015 Location: Louisville, KY Posts: 826	Are you tapped into the right location? it sounds like you have a vacuum line. Sent from my Pixel 5 using Tapatalk __________________ 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.

02-12-2021, 11:45 AM	#4
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,019	Mine was always off. I went to an Aeroforce to read through the OBD2 since I had a 3 bar map and never looked back. __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X

02-15-2021, 09:48 PM	#6
Valkyrie14 Valkyrie14 Drives: Chevrolet Camaro SS Join Date: Mar 2020 Location: Eau Claire, Wisconsin Posts: 962	I did some re-routing of the boost lines today. I had a T on the hose that runs the boost actuator. The line is now right off of the stem that comes off of the blower right behind the actuator. No change in the reason on the glow shift boost gauge. Considering an AEM boost gauge. __________________ 2014 SS LS3/LSA Supercharger, 10% Super Damper, 2.55 upper, AGP Dual Pump, ID 1050 injectors, Pegasus solid rear cradle bushings, LT Headers, Roto-Fab CAI, Elite E2 catch can, E85 corn fed, 160 Thermostat, Monster Twin Disk, MGW Short Throw shifter, Tick Clutch Master Cylinder, HP Tuners, JL Audio system.

02-16-2021, 03:45 PM	#7
Whitlow Drives: Chevrolet Camaro Join Date: Mar 2020 Location: Virginia Posts: 138	Mine read the same while driving down the road but when I'm into it the boost goes to 7 which is where mine should be. I think my gauge is right and it's like it should be. Sent from my SM-G781U1 using Tapatalk __________________

02-17-2021, 06:24 AM	#9
larry_g Drives: 2014 1SS/1LE Join Date: Nov 2015 Location: Louisville, KY Posts: 826	Still sounds like a vacuum line. Do you have pics of where everything is tapped in and T off? I'm not as familiar with the LSA blower, but on the whipple, the actuator is vacuum operated ( before the rotors). I tapped my boost gauge from the plenum under the rotors. Sent from my Pixel 5 using Tapatalk __________________ 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.

02-17-2021, 08:56 AM	#10
larry_g Drives: 2014 1SS/1LE Join Date: Nov 2015 Location: Louisville, KY Posts: 826	https://www.ctsvowners.com/threads/b...roblems.38468/ __________________ 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.

02-17-2021, 09:50 AM	#11
Valkyrie14 Valkyrie14 Drives: Chevrolet Camaro SS Join Date: Mar 2020 Location: Eau Claire, Wisconsin Posts: 962	Here are pics of my setup. First 2 pics show my lines coming off of the blower. The upper stem is the line that runs to the regulator, Hobbs and boost gauge. The lower stem runs to the front upper inlet of the actuator. I have the lower inlet on the actuator is capped off. I noticed on the pics of the CTS V and pics I have seen on ZL1 there is a whole other sensor below the actuator that I don’t have. Please help me sort this out. Attached Images __________________ 2014 SS LS3/LSA Supercharger, 10% Super Damper, 2.55 upper, AGP Dual Pump, ID 1050 injectors, Pegasus solid rear cradle bushings, LT Headers, Roto-Fab CAI, Elite E2 catch can, E85 corn fed, 160 Thermostat, Monster Twin Disk, MGW Short Throw shifter, Tick Clutch Master Cylinder, HP Tuners, JL Audio system.

02-17-2021, 10:10 AM	#12
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	Mine is tapped into the brake booster line. It was near perfect with the dyno. It's an AEM boost gauge. The glowshift are known to be slightly less accurate. You should be seeing boost psi once you are in it. Reading zero is likely from connected wrong spot. __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.

02-17-2021, 10:35 AM	#13
larry_g Drives: 2014 1SS/1LE Join Date: Nov 2015 Location: Louisville, KY Posts: 826	I have to agree that it looks like you are tapped into the correct location. Have you been able to confirm that the Hobbs switch is actually seeing boost and working and that the fuel pressure is holding steady? Is it possible that the FPR or one of the fittings is bleeding off boost pressure? Is it possible the bypass valve is not closing and you aren't actually getting into boost? Process of elimination would say the gauge may be bad but it seems odd that the vacuum reading works but the boost doesn't. __________________ 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.

02-17-2021, 10:41 AM	#14
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	Maybe a one way valve in the wrong spot? __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.