How much boost does a stock M62 Gen III make?
Is is ok to T off of the Charcoal canister line to measure?


Andrew

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92 Park Ave Ultra, Gen III M62 Supercharger, Stock 3.5" Throttle body, Pulley and Boost Control from 95 Riviera. 3.5" Spectre intake piping, reduced to 3" stock air box with Spectre air filter.
All else Stock 92 Ultra

86 Buick Regal T-type.
TA-49, 206/206 cam, SMC Alchy injection, lots of other parts

You can tap off any of the lines that come from the vacuum tree by the BCA.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

thats what i thought for the tap. i was seeing 2psi max at WOT. i thought that was really low. did come out of vacuum quick but i had expected around 7psi. i dont know what the M62 can put out. (vac was good at idle,18-20 in.hg)

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92 Park Ave Ultra, Gen III M62 Supercharger, Stock 3.5" Throttle body, Pulley and Boost Control from 95 Riviera. 3.5" Spectre intake piping, reduced to 3" stock air box with Spectre air filter.
All else Stock 92 Ultra

86 Buick Regal T-type.
TA-49, 206/206 cam, SMC Alchy injection, lots of other parts

There might be a leak in that line or the canister bleeds off positive pressure? Cap the line off to exclude the canister and try again. You should get about 7 psi. The gauge shows 0 when the engine's not running, right?

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

Moving to the proper section.

There are some possible questions related to the fact that this is a swap:

1. Is your evap system tied in to the vacuum manifold as it was stock? This would be 'post inlet', not pre-inlet? Any boost indication would only be seen at the vacuum manifold closest to the nosedrive.

2. Is your BCA and BCS properly controlled and connected both in terms of vacuum and in terms of the BCS solenoid (electrical)?

3. What are you using to measure the 2psi of boost? Be specific, links if possible.


Test your BCA mechanically using the red link in my signature.

_________________

Click here for mod list for both cars
93 SSEi, 95 SLE (supercharged) 97 Buick LeSabre Limited
PontiacDad at WCBF '04: Cruise control? That's like surrendering!
Comprehensive guide to troubleshooting, rebuilding, and modifying Eaton Superchargers

instead T ing into the Fuel Pressure Regulator sense line as shown in the links, i T'd into the next one up on the vac tree which is the Evap charcoal canister.
Boost control actutator tested on the bench before install and after intall solenoid was tested as per links and all looks proper
all vac lines are stock configuration. im seeing good vac
good posibility about the evap canister bleeding boost. i will check without the canister connected.
Confirming that i should see about 7psi boost.

_________________
92 Park Ave Ultra, Gen III M62 Supercharger, Stock 3.5" Throttle body, Pulley and Boost Control from 95 Riviera. 3.5" Spectre intake piping, reduced to 3" stock air box with Spectre air filter.
All else Stock 92 Ultra

86 Buick Regal T-type.
TA-49, 206/206 cam, SMC Alchy injection, lots of other parts

i also used a vac/ 30 psi mechanical pressure gauge. i then added another pressure gauge to confirm my first gauge was proper. pulled vac with hand held tester on test rig to confirm no leaks.
ill post again after running without the evap canister line.

_________________
92 Park Ave Ultra, Gen III M62 Supercharger, Stock 3.5" Throttle body, Pulley and Boost Control from 95 Riviera. 3.5" Spectre intake piping, reduced to 3" stock air box with Spectre air filter.
All else Stock 92 Ultra

86 Buick Regal T-type.
TA-49, 206/206 cam, SMC Alchy injection, lots of other parts

If the BCA and BCS are working properly, and you don't have belt slip, it's physically impossible to have too little boost. It's not possible for a supercharger in our application to physically under-boost by itself. The only possibility is boost CONTROL. That comes down to the BCA function primarily. Boost indication may be another factor.

_________________

Click here for mod list for both cars
93 SSEi, 95 SLE (supercharged) 97 Buick LeSabre Limited
PontiacDad at WCBF '04: Cruise control? That's like surrendering!
Comprehensive guide to troubleshooting, rebuilding, and modifying Eaton Superchargers

Good point about the BCS. Take the vacuum elbow off the bottom of the BCA and test your boost again. If it goes back up, check the wiring to the BCS. If the wiring is fine, replace the BCS.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

looks like i had T'd into the line for the Trans modulator which also T's into the primary vacumuum block when i did my first test.
tested direct without the T and now showing 5psi and climbing to 6psi at the top of the RPMs.

ill also see if i get any more boost with the BCS bottom vac line off
thanks for the tips.
Andrew

_________________
92 Park Ave Ultra, Gen III M62 Supercharger, Stock 3.5" Throttle body, Pulley and Boost Control from 95 Riviera. 3.5" Spectre intake piping, reduced to 3" stock air box with Spectre air filter.
All else Stock 92 Ultra

86 Buick Regal T-type.
TA-49, 206/206 cam, SMC Alchy injection, lots of other parts

You should get a few more psi than that. Stock gen 3 pulley, right? Any other mods? Roller rockers or anything else that helps move air in/out of the cylinders will lower the boost because there is less "boost stacking".

_________________

WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

Adding your swap and mods to your signature would help us a ton.

_________________

Click here for mod list for both cars
93 SSEi, 95 SLE (supercharged) 97 Buick LeSabre Limited
PontiacDad at WCBF '04: Cruise control? That's like surrendering!
Comprehensive guide to troubleshooting, rebuilding, and modifying Eaton Superchargers