need opinion on boost leak

[teamitr]

I have about 4 to 5 small pencil led size holes on some welds in my charge pipe is that affecting me alot while at boost and also would it be the cause of my vac reading to be at 40.

 

[Spooling99]

If your vac is 40 at idle I think something else might be wrong.

 

[brute]

I didn't know they had gauges that read -40in/hg... Ah well. You definitely should get those patched.

 

[TheRealist]

I have about 4 to 5 small pencil led size holes on some welds in my charge pipe is that affecting me alot while at boost and also would it be the cause of my vac reading to be at 40.

pay 5 to 10 bucks and take it to any muffler shop and have them weld in the little holes. that can cuase alot of loss of performance.

 

[TheRealist]

I didn't know they had gauges that read -40in/hg... Ah well. You definitely should get those patched.

yes The Autometer ULTRALITE II has both in/hg and PSI

 

[brute]

But they go to 30in/hg... I'm saying I didn't know they made gauges that read all the way to 40. Mine is a 30in/hg-30psi gauge.

 

[TheRealist]

But they go to 30in/hg... I'm saying I didn't know they made gauges that read all the way to 40. Mine is a 30in/hg-30psi gauge.

o i get you now my bad

 

[TheRealist]

whats normal hg reading??

 

[teamitr]

well i have an electronical one so that why it's giving me that number i guess.

so what else culd be wrong?

 

[fwdturbobov1996]

whats normal hg reading??

I usually pull around 18-22

 

[Spooling99]

I thought normal was 18 at idle and around 24 on deceleration.

 

[andymoraitis]

I thought normal was 18 at idle and around 24 on deceleration.

It depends on compression, cams and elevation. I see 16 at idle and 24 on deceleration with the stroker and Comp 200's.

For the original poster, if your gauge is electric and not mechanical, I would recommend that you either re-check the wiring or purchase a mechanical gauge to see what your true vacuum is.

Cheers,

Andy

 

[mobythevan]

But they go to 30in/hg... I'm saying I didn't know they made gauges that read all the way to 40.

Just one thing to point out, 30in/hg of vacuum is the most you can ever have, that is a perfect vacuum.

I figured when I read the post he was listing 40kpa, that would be typical with a few leaks. My car idles at 24kpa. ????

 

[No_Skillz]

If you had leaks, the number would go down, not up.

 

[mobythevan]

not if your talking kpa, if your talking inches of vacuum then yes. That is why I thought he must be talking kpa. I run speed density on my car so I am use to seeing the numbers in kpa format, so idle is at like 24kpa and WOT is 100kpa, and 10psi boost reads like 170kpa.