vac decrease

[gstnate]

I recently installed a newer T25 on my gst. When I had my other Turbo on my vacuum stayed around 15 HG. After the swap it still ran at about 15. But recently my vacuum has decreased to 10 HG or less. So what could be the cause of this. Is it anything I should worry about?

 

[zcoh2gdsm]

vacuum leak somewhere.

 

[MathixPerforman]

the common place to leak vacuum is around the intake gasket, throttle body gasket, the egr valve. Also check all vacuum connections because it sounds like even before you switched your turbo you had a problem. The good vacuum zone is between 18 and 22 psi.

 

[TuRBoTaLooN]

The good vacuum zone is between 18 and 22 psi.

X2. Time for a boost/vacuum leak test

 

[TSITurbo95]

Do a BLT. If you have them, do a leak down, and compression test (worse case scenario)

 

[Frskrgps]

also check the o rings around your injectors where they go into the head

 

[9!'clipseDOHC]

As others have already mentioned, you need to do a boost leak test before we can help you anymore.

http://www.dsmtuners.com/forums/articles-turbo-system-intercooler/169435-boost-leak-test-how-boostpro-net-tester.html

 

[gstnate]

OK so ill go ahead and find a leak tester and go from there. Thanks guys

 

[9!'clipseDOHC]

OK so ill go ahead and find a leak tester and go from there. Thanks guys

Just so you know you can make your own.

Make your own from hardware store plumbing.

You just need a rubber coupler that will fit around the inlet of your compressor. Then, cap off the other end and install a schrader valve in the cap. And you have a boost leak tester that costed less than $10 to make.

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How To: Boost leak tester for $5.02 - evolutionm.net

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