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Discussion Starter #1
i just hooked up my boost gauge and the vacume shows up to 20-25psi when ideling. Is this normal. it is T'd off between the blowoff valve and throttle body.
I had it T'd off between the wastgate and hotpipe and it showed less than 5pounds vacume. can anyone give me some info. plus it reads boost correctly.
 

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Well it would help if we knew what engine we were dealing with.
 

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Discussion Starter #4
I didnt know that the vacume was reading at mmHG (What does that stand for anyways?) By the way my engine is a s13 red top. Thanks for the help james
 

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What is important is the pressure the engine is experiencing. The closer to the intake you can measure it, the better.

Lew
 

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Discussion Starter #10
ive never heard or seen anyone use that metheod....Or maby i just wasent looking hard enough
 

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retardeds13 said:
ive never heard or seen anyone use that metheod....Or maby i just wasent looking hard enough
Happens a lot but I had a nipple right off my intake manifold that was free (don't ask me why but it was) and I used that.
 
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