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Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 05-22-2003, 07:30 AM   #1
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Default WHERE DID MY BOOST GO?

Hey , i just got my cat removed and flowmaster 80 series installed today and i noticed i lost about 2-3 pounds of boost??? is there an explanation to this?
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Old 05-22-2003, 01:27 PM   #2
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The flow is still there, just that you opened up the exhaust so your INDICATED boost went down. This is somewhat normal.

Imagine trying to blow up a balloon with a hole in the other end. A pressure gauge is in the balloon. Plug the hole, and you can build pressure, move your finger, and it'* easier to blow it up, but the gauge reads lower.

Make sense?
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Old 05-23-2003, 01:53 AM   #3
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So Will, does that mean that when you open up your exhaust you can go to a smaller supercharger pulley to bring the boost back up to where it was before the exhaust pressure reduction, and not require adding an intercooler to cool down the charge.

Hmmm, I think I may have just answered my own question. The supercharger is still going to produce more heat due to the extra heat of compression caused by spinning it faster with the smaller pulley.

Hmmm, So that'* how the get away with not having to add an intercooler at the factory....because there'* so much damn exhaust restriction

I suppose the only real way to determine how close one is to requiring an intercooler would be to monitor Knock Retard.
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Old 05-23-2003, 12:40 PM   #4
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i have to jump in here... exaust restriction should have no effect on supercharger boost... less intake restriction will lower the boost pressure because more is getting into the cylinder but exaust restriction should have no effect what so ever, see what i am talking about?
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Old 05-23-2003, 12:53 PM   #5
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boost problems hehehe
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Old 05-23-2003, 05:03 PM   #6
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Quote:
have to jump in here... exaust restriction should have no effect on supercharger boost... less intake restriction will lower the boost pressure because more is getting into the cylinder but exaust restriction should have no effect what so ever, see what i am talking about?
Actually think about this. The intake air comes into the engine. Then it flows through the engine and exits out the exhaust. If the exhaust doesn't flow well enough, then it will backup into the engine, and into the intake manifold, and your boost will be higher. Usually installing headers will drop boost a couple lbs.

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So Will, does that mean that when you open up your exhaust you can go to a smaller supercharger pulley to bring the boost back up to where it was before the exhaust pressure reduction, and not require adding an intercooler to cool down the charge.
OK, actually this does work. When a blower compresses air it heats it up because it is cramming it into an area at a certain amount of pressure. The more pressure it has to make the hotter the air will be. So, if the flow is better, there will be less pressure, meaning there will be less heat, and you can run a smaller pulley. That is why if someone puts a cam in their L67 they can run a smaller pulley because the flow is better. The same with headers. My moms SSEi was getting Knock Retard, so we installed rockers on it so it would flow better so the Knock Retard would go down. But really without very significant mods you can't go less than a 3.25" pulley, and you need some decent mods to be able to run a 3.25. Without a way to scan for KR, you want to stay with a 3.4 because you don't want to be blowing up any engines because you ran too small of a pulley.
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Old 05-25-2003, 11:16 PM   #7
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boost problems hehehe
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Quiet your damn gloating "Turbo beast" and offer some constructive advice or criticism.

Is that how you got your name.....from never sticking your head out of your shell.
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