8 replies to this topic

[xluke]

Hello,
Regarding '99 v70:
I am fairly certain I have a boost leak, or leaks, as I am both losing boost and I think I can hear it. I have all new silicon hoses and intercooler tubes so who knows. Anyway, I would like to make a simple boost leak tester w/ some plumbing parts but my question is, can I attach it to the MAF, or will pressure in some way damage the MAF? Removing the MAF is a pain as it is held in by a tight plastic groove, and the inlet of the turbo is both at an inconvenient location and a non-standard plumbing size.

Thanks!

[Spanky]

xluke, on 16 November 2009 - 10:39 PM, said:

Hello,
Regarding '99 v70:
I am fairly certain I have a boost leak, or leaks, as I am both losing boost and I think I can hear it. I have all new silicon hoses and intercooler tubes so who knows. Anyway, I would like to make a simple boost leak tester w/ some plumbing parts but my question is, can I attach it to the MAF, or will pressure in some way damage the MAF? Removing the MAF is a pain as it is held in by a tight plastic groove, and the inlet of the turbo is both at an inconvenient location and a non-standard plumbing size.

Thanks!

Go down stream!!! Your talking pre-turbo which has a CBV in it. I would either go right after the turbo (kinda of pita) or right after your turbo-intercooler pipe ends. Take off the hose at one of these places and pressure test it up to the TB.
Homemade boost leak
If you chose to to go post intercooler-turbo pipe make sure you inspect the hose that is on the turbo compressor outlet.

[ozzimark]

SPANKY, on 17 November 2009 - 09:40 AM, said:

Go down stream!!! Your talking pre-turbo which has a CBV in it.

Well, that shouldn't matter, since the CBV vents from the compressor outlet back into the compressor inlet. The thing I would be concerned about is that the hose from the MAF to the turbo inlet isn't designed to be pressurized

[Spanky]

I have CBV dyslexia this week, fuckin twice in two days

[Markymark]

SPANKY, on 18 November 2009 - 12:29 AM, said:

I have CBV dyslexia this week, fuckin twice in two days

Is it okay to put the boost leak tester right on the inlet of the turbo? I'm going to be doing this soon.

[randomdude]

^im pretty sure that it is fine.

[Spanky]

Markymark, on 18 November 2009 - 02:46 AM, said:

Is it okay to put the boost leak tester right on the inlet of the turbo? I'm going to be doing this soon.

I would still go post turbo.

[randomdude]

^whys that? wouldnt test pre turbo also test your CBV/the turbo to first intercooler pipe connection, and the turbo itself? perhaps that would be futile, im just asking.

do you guys normally just do pressure tests, or smoke tests?

[Spanky]

randomdude, on 19 November 2009 - 06:23 PM, said:

^whys that? wouldnt test pre turbo also test your CBV/the turbo to first intercooler pipe connection, and the turbo itself? perhaps that would be futile, im just asking.

do you guys normally just do pressure tests, or smoke tests?

Its not the right answer its just mine . I would choose to eliminate as many factors as I could if I was trying to accurately find the culprit. CBV (oh shit here I go again) could be questionable depending on what part is torn and if there is a air tight seal when completely engaged. The compressor housing should be air tight, but then again there is no internal pressure or oil being pumped through when the engine is off. That thread Hussein made about Hahn race craft was in a large part piston ring failure.