The reason you MUST do a "boost leak test"!! Don't pass go. Read this.
Feb 24, 2008, 08:42 AM
#136
I did a boost leak test and found some leaks that I fixed. I have a forge mbc and it leaks from the vent hole at around 5psi and up. Is this normal? When I did the test I clamped off the hose to the mbc to check the system. I have the hard spring in it and its backed off all the way. It goes to 22 psi at full boost.
Feb 24, 2008, 09:17 AM
#137
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I did a boost leak test and found some leaks that I fixed. I have a forge mbc and it leaks from the vent hole at around 5psi and up. Is this normal? When I did the test I clamped off the hose to the mbc to check the system. I have the hard spring in it and its backed off all the way. It goes to 22 psi at full boost.
Feb 24, 2008, 11:20 AM
#138
I'm going to bring this one back from the dead.
I put on a TBE, Forge MBC, Walbro fuel pump, and cone filter air intake, and somewhere in there started getting a P0171 "System too Lean - Bank 1" ECU code thrown on a regular basis. I have checked everything I could, and I am wondering if I could be getting this kind of code so constantly from a boost leak somewhere in the system?
I am going to fabricate a boost leak tester like the ones described in this thread (something like this one - http://www.vfaq.com/mods/ICtester.html ) and check it, but I am wondering if anyone else has had a System too Lean ECU code actually being thrown from a boost leak?
I put on a TBE, Forge MBC, Walbro fuel pump, and cone filter air intake, and somewhere in there started getting a P0171 "System too Lean - Bank 1" ECU code thrown on a regular basis. I have checked everything I could, and I am wondering if I could be getting this kind of code so constantly from a boost leak somewhere in the system?
I am going to fabricate a boost leak tester like the ones described in this thread (something like this one - http://www.vfaq.com/mods/ICtester.html ) and check it, but I am wondering if anyone else has had a System too Lean ECU code actually being thrown from a boost leak?
Apr 20, 2009, 07:48 PM
#144
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you could, problem is.... and i stress this to all of you.. but you need to boost leak test close to what you will be runing for boost. sometimes you wont find a leak if your boost gauge only shows 5psi while testing, up it to 15psi or 20psi and might find a T-bolt not tight enough, and so on... so your leak tester that you"make" must be able to take alot of air pressure without shooting off.
Apr 21, 2009, 04:14 AM
#145
you could, problem is.... and i stress this to all of you.. but you need to boost leak test close to what you will be runing for boost. sometimes you wont find a leak if your boost gauge only shows 5psi while testing, up it to 15psi or 20psi and might find a T-bolt not tight enough, and so on... so your leak tester that you"make" must be able to take alot of air pressure without shooting off.
