Bonneville Supercharger Problems

BadAndy · 12-04-2006

hey i have a friend thatinstalled a shit load of performance parts and have no boost. put new 3.4 pulley and isnt prducing boost dont kow if it was producing boost before hand any suggestions?

dvldoc · 12-04-2006

The boost bypass valve is about the only thing that will keep the M90 from producing boost. Does he have a aftermarket boost gauge hooked up and hooked up correctly?

Second there are several vac lines that can come loose on the supercharger that can bleed off alot of boost.

M90'S are nothing more than a big air pusher they have to make boost if they are turning and the bypass valve is functioning properly and the coupler in the snout is engaged and turning the rotors.

BadAndy · 12-04-2006

ok we checked the mainline that the boost gauge is on that is fine. umm we install rocker roller arms. and exhaust what r the major areas to check for boost leak?

Rocket468 · 12-04-2006

take some vac hose and put it in your ear, and follow the vaccum lines you will hear the leak.

BadAndy · 12-05-2006

ok well we didnt find any leak but could it be the supercharger going bad this guy brought it to us as is asked us to work on it. we didnt check the boost from the start but it is now producing 3lbs of boost and we havent done anything different. so we dont know what the problem is i am thinking it is a boost leak that we need ot find but couldit be a really old SC cuz he has almost 200,000 miles on it?

dvldoc · 12-05-2006

Have you checked the boost bypass valve yet, it the connector is damaged or unplug a vehicle will only make 3psi of boost.

12-04-2006	#1 (permalink)
BadAndy Alcohol Injection Join Date: Apr 2006 Posts: 42	Bonneville Supercharger Problems hey i have a friend thatinstalled a shit load of performance parts and have no boost. put new 3.4 pulley and isnt prducing boost dont kow if it was producing boost before hand any suggestions?

12-04-2006	#2 (permalink)
dvldoc DevilsOwn Staff Join Date: Apr 2005 Posts: 1,931	Re: Bonneville Supercharger Problems The boost bypass valve is about the only thing that will keep the M90 from producing boost. Does he have a aftermarket boost gauge hooked up and hooked up correctly? Second there are several vac lines that can come loose on the supercharger that can bleed off alot of boost. M90'S are nothing more than a big air pusher they have to make boost if they are turning and the bypass valve is functioning properly and the coupler in the snout is engaged and turning the rotors.

12-04-2006	#3 (permalink)
BadAndy Alcohol Injection Join Date: Apr 2006 Posts: 42	Re: Bonneville Supercharger Problems ok we checked the mainline that the boost gauge is on that is fine. umm we install rocker roller arms. and exhaust what r the major areas to check for boost leak?

12-04-2006	#4 (permalink)
Rocket468 DevilsOwn Staff Year: 2000 Make: Pontiac Model: Grand Prix Join Date: Apr 2005 Posts: 1,083	Re: Bonneville Supercharger Problems take some vac hose and put it in your ear, and follow the vaccum lines you will hear the leak.

12-05-2006	#5 (permalink)
BadAndy Alcohol Injection Join Date: Apr 2006 Posts: 42	Re: Bonneville Supercharger Problems ok well we didnt find any leak but could it be the supercharger going bad this guy brought it to us as is asked us to work on it. we didnt check the boost from the start but it is now producing 3lbs of boost and we havent done anything different. so we dont know what the problem is i am thinking it is a boost leak that we need ot find but couldit be a really old SC cuz he has almost 200,000 miles on it?

12-05-2006	#6 (permalink)
dvldoc DevilsOwn Staff Join Date: Apr 2005 Posts: 1,931	Re: Bonneville Supercharger Problems Have you checked the boost bypass valve yet, it the connector is damaged or unplug a vehicle will only make 3psi of boost.