Supercharged/Turbocharged The increase in air/fuel pressure above atmospheric pressure in the intake system caused by the action of a supercharger or turbocharger attached to an engine.

Is 11 in HG for a 3.33" low?

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Old 12-27-2002, 08:35 AM
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Is 11 in HG for a 3.33" low?

Forgive me guys but I'm a newbie at reading the gauge. I'm getting about 11 in HG Vacuum on the meter and I've got the 3.33" pulley. Is that correct or am I leaking somewhere? I managed to hook up the boost gauge but I put a kink in the clear plastic line that runs into the t-fitting on the vacuum hose. Should I replace that plastic line?
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Old 12-27-2002, 08:53 AM
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I think that's low. I get 20mmHg and I too have a 3.33 pulley.
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Old 12-27-2002, 09:35 AM
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Pulley size shouldn't affect your idle vacuum... The BOV is fully open bleeding the boost to atmosphere...
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Old 12-27-2002, 09:49 AM
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Originally posted by [maxi-overdose]
I think that's low. I get 20mmHg and I too have a 3.33 pulley.
My Autometer gauge is measuring in inHg. What gauge do you have?
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Old 12-27-2002, 10:54 AM
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Originally posted by BlackCat


My Autometer gauge is measuring in inHg. What gauge do you have?
sorry, typo....should be in Hg.

I have Apexi mechanical boost gauge.

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Old 12-27-2002, 11:02 AM
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Wow...looks like I've a big leak somewhere...
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Old 12-27-2002, 03:02 PM
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Originally posted by BlackCat
Wow...looks like I've a big leak somewhere...
Or that kink in the nylon hose is messing up your readings, i had that problem too. I bought a tiny piece of cooper tubing to run instead of that nylon stuff.
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Old 12-27-2002, 05:48 PM
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Re: Is 11 in HG for a 3.33" low?

Originally posted by BlackCat
Forgive me guys but I'm a newbie at reading the gauge. I'm getting about 11 in HG Vacuum on the meter and I've got the 3.33" pulley. Is that correct or am I leaking somewhere? I managed to hook up the boost gauge but I put a kink in the clear plastic line that runs into the t-fitting on the vacuum hose. Should I replace that plastic line?
Dude lemme know if you find out the cause/fix. I have the same exact problem on mines. Haven't been able to find any leaks. Everything is running fine..

-D
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Old 09-28-2003, 03:11 PM
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Update:
I swapped out the kinked tubing with new nylon tubing. I'm at 15/16 in HG. That means I'm still leaking. I'll have to see where I can find some copper tubing.
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Old 09-28-2003, 07:22 PM
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I had a leak for a long time.

Turned out that it was both the gauge leaking where it met the tubing, and a leak at the EGR tube at the back of the manifold.

I found it by going to a shop with a "SMOKE-IT" machine. They pump harmless white smoke through the system - wherever it comes out - there's your leak.

Took them all of 5 minutes to find it - I had been spraying brake cleaner over my vacuuml ines for months before that.

I now read 19-22Hg. It seems to vary a little by outside humidity and temp - it's usually at 19 however.

Now I'm still trying to figure out why I only read 7.5PSI of boost with a 3.12" Pulley.

IanS
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Old 09-29-2003, 09:15 AM
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Thanks Ian,
I've always suspected that it could the tubing setup because it didn't feel that snug at the connections. I'll look for the copper tubing and try that out instead.
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Old 09-29-2003, 09:56 AM
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Originally Posted by BlackCat
Thanks Ian,
I've always suspected that it could the tubing setup because it didn't feel that snug at the connections. I'll look for the copper tubing and try that out instead.
I ended up just fabricating a connector going from the nylon tube to the back of the gauge using rubber hose.....

But in my case, the tube was fine, just the connector sucked.
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