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Old May 16, 2007 | 11:55 AM
  #11  
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Originally Posted by Spoolin
Would that really effect boost on a S/C though? I know a free'er flowing exhaust will let the engine breath better but what's the correlation with boost pressure?
Yes it would. Boost is a measure of restriction. No restriction = no boost. By opening up a restrictive exhaust, the engine can exhale more exhaust and allow more intake air to fill the cylinders sooner. Basically the efficiency of the pump (engine) is better with the open exhaust, and that allows the other pump (the supercharger) to more easily fill the cylinder. In this scenario, boost pressure may be lower, but actual cfm of air should be as much or higher.
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Old May 16, 2007 | 07:04 PM
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So his intercooler was too small. (?)
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Old May 16, 2007 | 08:04 PM
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Originally Posted by ColtSteele
me too- I would have thought you'd gained at least 1/2 - 1 psi of boost by removing the ic. Did you do anything else to it?
I thought I read somewhere you were adding headers and maybe opening up the exhaust did you do anything else? Just curious.
1/2 to 1 psi of boost gain is what I thought. The only other thing we did was to increased the runner lengths on the intake manifold by a 1/2" and shaped them for faster air speed off the inside corner of the floor. Air speed effeciency was increased by almost 4%. I'm still running the same exhaust setup as before. Time for a smaller pulley? lol
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Old May 16, 2007 | 08:07 PM
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Originally Posted by BigTex
Yes it would. Boost is a measure of restriction. No restriction = no boost. By opening up a restrictive exhaust, the engine can exhale more exhaust and allow more intake air to fill the cylinders sooner. Basically the efficiency of the pump (engine) is better with the open exhaust, and that allows the other pump (the supercharger) to more easily fill the cylinder. In this scenario, boost pressure may be lower, but actual cfm of air should be as much or higher.
So with higher cfm numbers and lower boost numbers, I should be making more power than before?
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Old May 16, 2007 | 08:36 PM
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i still want to get ahold of one of those MP1 intakes. Doesn't Wilson make an adapter for the throttle body? What else did you have to do to make it work? I'm still wanting to get the composite intake off. The sheetmetal intake Wilson said they would make for me was in the $3,000 range... uuhhhhmmmmm NO!!
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Old May 16, 2007 | 09:04 PM
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Wilson makes one, but I didn't like the design because of the short radius. I just made my own.
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Old May 16, 2007 | 09:45 PM
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Originally Posted by hemidup
So with higher cfm numbers and lower boost numbers, I should be making more power than before?
If you truly have more CFM flow and show less boost, then yes. You generate heat when you compress air. Making 10 psi will create more heat than 8psi and use more power to compress the air, which is where efficiency comes in. More CFM with lower boost (less heat) is more efficient and should yield more power. Obviously other factors like timing and in your situation removing the intercooler while adding water injection will alter the outcome.
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Old May 16, 2007 | 10:19 PM
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Originally Posted by BigTex
If you truly have more CFM flow and show less boost, then yes. You generate heat when you compress air. Making 10 psi will create more heat than 8psi and use more power to compress the air, which is where efficiency comes in. More CFM with lower boost (less heat) is more efficient and should yield more power. Obviously other factors like timing and in your situation removing the intercooler while adding water injection will alter the outcome.
We've been working with Terry from the Super Charger Store who made the first suggestion of taking the 5.0 Mustang Vortech intercooler off and going with the h2o injection. He was talking something about "stacked air"? He said with my 8.6:1 compression (fully forged motor and blower piston's) and running non oxygenated 93 octane wouldn't require the use of methonal unless KR showed it's ugly head. So far, so good. I'm curently in the final tuning process. Thanks for everyone's input.
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Old May 17, 2007 | 12:16 AM
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Find a 1200HP rated intercooler and some elbows on EBay and build your own intercooler setup. That's what I did and it works amazing. IAT gets to no more than 25 degress over ambient IAT no matter where the throttle is and that with hot-air intake. I also have a very large surface are heat exchanger up front. Better to go large area and thin than small area and thick when shedding the most heat is desired.





This is the intercooler radiator on the right side:
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Old May 17, 2007 | 05:34 AM
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You go richer because your air isn't as dense now. So basically you're getting less air, same fuel.

Don't forget your cam that you added. Remember I talked to you about overlap and superchargers? You can be losing boost based off the cam overlap (and other characteristics) and with a supercharger it's just lost. With a turbo, the turbo adds more boost automatically causing it to work harder and have a little more EGT. I was figuring you'd pick up boost from the i/c removal, and lose some based on the cam, and you'd be even.
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