S/C update: 0 psi boost! Need help...
04-26-2011, 12:39 PM
#31
3rd Gear Member
Join Date: Jan 2008
Location: Delaware
Posts: 708
I don't have this particular car (09 GT) supercharged, yet 
However, I have supercharged mustangs in the past. I personally would not suspect the cams being an issue. Yes, they and the LT's together flow more exhaust, but I hardly feel it's enough to be blowing ALL of the boost out of the cylinders that quick. It's easier for a motor, or anything sealed for that matter, to release a vacuum than it is a small amount of pressure.
However, I have supercharged mustangs in the past. I personally would not suspect the cams being an issue. Yes, they and the LT's together flow more exhaust, but I hardly feel it's enough to be blowing ALL of the boost out of the cylinders that quick. It's easier for a motor, or anything sealed for that matter, to release a vacuum than it is a small amount of pressure.
04-26-2011, 01:21 PM
#32
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Thread Starter
Join Date: Mar 2010
Location: Camp Lejeune, North Carolina and Fort Lauderdale, Florida
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Well, I just got back from Blow By Racing....Let me just say, they are some AWESOME dudes!! I talked to Chris for a little while and a couple other guys there. One was a former Marine and now serving in the Guard. We talked a while about our war stories hehe.
Anyways, Chris was telling me that the cams have a duration of 110, while most FI cams have a duration of 114 and that the Hot Rods can and will blow out about 2.5-3.5 psi, and the long tubes will blow out about a pound, which means that my .5-1psi reading would be pretty accurate. He's the second person to tell me that as well. I ended up getting the 3.4" pulley and the KB Boost-a-pump so I can run the 10psi kit. We'll see how this ends up working out for me. I'm going to let my car cool off from the 45 minute drive up there and then I'm going to work!! I'm done crossing fingers...I'm praying this time!!!
Anyways, Chris was telling me that the cams have a duration of 110, while most FI cams have a duration of 114 and that the Hot Rods can and will blow out about 2.5-3.5 psi, and the long tubes will blow out about a pound, which means that my .5-1psi reading would be pretty accurate. He's the second person to tell me that as well. I ended up getting the 3.4" pulley and the KB Boost-a-pump so I can run the 10psi kit. We'll see how this ends up working out for me. I'm going to let my car cool off from the 45 minute drive up there and then I'm going to work!! I'm done crossing fingers...I'm praying this time!!!
04-26-2011, 05:34 PM
#36
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Thread Starter
Join Date: Mar 2010
Location: Camp Lejeune, North Carolina and Fort Lauderdale, Florida
Posts: 470
No underdrive pulleys. I got sidetracked and played golf with my aunt today instead of working on the car...its nice to be on leave and be able to do what I please when I please lol. Going to work on the car now! I'm sure I'll be here for some advice on putting in this boost-a-pump because I flat out suck at electrical stuff!
04-26-2011, 10:30 PM
#37
3rd Gear Member
Join Date: Jan 2008
Location: Delaware
Posts: 708
Well, I just got back from Blow By Racing....Let me just say, they are some AWESOME dudes!! I talked to Chris for a little while and a couple other guys there. One was a former Marine and now serving in the Guard. We talked a while about our war stories hehe.
Anyways, Chris was telling me that the cams have a duration of 110, while most FI cams have a duration of 114 and that the Hot Rods can and will blow out about 2.5-3.5 psi, and the long tubes will blow out about a pound, which means that my .5-1psi reading would be pretty accurate. He's the second person to tell me that as well. I ended up getting the 3.4" pulley and the KB Boost-a-pump so I can run the 10psi kit. We'll see how this ends up working out for me. I'm going to let my car cool off from the 45 minute drive up there and then I'm going to work!! I'm done crossing fingers...I'm praying this time!!!
Anyways, Chris was telling me that the cams have a duration of 110, while most FI cams have a duration of 114 and that the Hot Rods can and will blow out about 2.5-3.5 psi, and the long tubes will blow out about a pound, which means that my .5-1psi reading would be pretty accurate. He's the second person to tell me that as well. I ended up getting the 3.4" pulley and the KB Boost-a-pump so I can run the 10psi kit. We'll see how this ends up working out for me. I'm going to let my car cool off from the 45 minute drive up there and then I'm going to work!! I'm done crossing fingers...I'm praying this time!!!
"We have seen +25HP and NO boost drop and we have seen +25HP and a 2psi drop ("mixing" cams and/or cam timing). Another commonly used component that can result in unpredictable HP swings are headers. Not many people realize this or understand why it happens. Another test you can perform is to place a simple pressure gauge in the front of the exhaust component being tested and note the back pressure. We see 2-20psi depending on engine HP and the exhaust system being tested. Cams: improved engine efficiency (HP) means it flows more air. Highly efficient cams should, therefore, lower boost. Expect a 1psi drop from a large enough cam. Cam Timing: Factory settings are not always the same and can vary boost 1-3psi and power by as much as 45HP. Altered cam timing (retard and advance) on Ford modular motors can effect power from up to 100+HP, depending on whether stock manifolds or headers are being utilized."
05-19-2011, 05:21 PM
#38
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Join Date: Jan 2008
Location: Delaware
Posts: 708
Sooo my buddy told me something that got me thinking , He said there was a 2011 5.0 mustang at the track ( I believe it was Blow by Racing ) it was procharged and making near 15psi . so my question is how can 4 cams and 32 valves that flows like a mother make that mush boost , and your hot rod cams virtually take away all your boost ? it it cause the 5.0 has the higher compression ? I just can't understand how your losing 6 psi
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