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09-11-2008, 10:19 PM #1
Anyone with Procharger experience - come in!
getting my car with an F1 - 10psi and 8.5:1
should I be looking at a bypass valve and water/meth injection for 93 octane street driving?Last edited by chief455; 09-11-2008 at 10:32 PM.
95 Z28 FORGED 355, JE 8.5:1 PISTONS, 230/239 - .530"/.546", 114 @ 110 CAM, stock heads, Pacesetter longtubes, 10 PSI from ATI P-1SC Procharger, 60#, 4L60E, Yank3600, 9" 3.73, ET Street 28x12.5x15, 3450lb
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09-11-2008, 10:42 PM #2
with that compression 10psi is nothing, over 15 you would be looking for meth, assuming your intercooled. Also get the biggest bypass you can, or get 2 tial 50mm BOVs. I have a vortech Mondo bypass and am going to add a second small regular BOV just for high rpm security. you can never have too much bypass on a big blower. BTW i run about 15psi on 93 octane and 9:1
94 T/A- forged 355 LT1, bone stock heads, Vortech YSi w/10-rib, FMIC, T56, 9"
http://s214.photobucket.com/albums/cc192/Grrh77/
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09-11-2008, 11:16 PM #3Long Live the Opti
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09-11-2008, 11:25 PM #4
Everyone above is 100% correct. But no one pointed out that the 'stock' procharger bypass valve is junk. At least get one that actually seals. In which case you may as well get the Procharger Race bypass so that you have room to grow.
My D1 made 15psi with the 'stock' bypass valve on this 383 and kept shredding 12-rib belts. I just installed a Race bypass and saw 2 more psi and so far the belt is holding up.
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09-11-2008, 11:35 PM #5Long Live the Opti
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Actually, that Procharger race bypass valve is the same thing as a lot of the larger BOV's. You could get a 56mm JGS for about 2/3 the cost and it's almost hte same thing (have one sitting here for my turbo build). IF you're going to get a big bypass, look at the larger BOV's too.
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09-12-2008, 09:22 AM #6
thanks for the replies!
what is a BOV?
pROCHARGER HAS THE $155 INLINE DEAL OR $55 SEALED DEAL
WHAT IS THE REAL RISK IN A LOWER COST BYPASS?
pLEASE EXPLAIN WHAT THE BYPASS DOES IN NORMAL OPERATION THAT MAKES IT NEEDED..sorry - caps lock is where my enter key used to be
Also - where does the valve install?
the car was tuned by thunder raciing
will i need more incector/tune if i go to 15psi?95 Z28 FORGED 355, JE 8.5:1 PISTONS, 230/239 - .530"/.546", 114 @ 110 CAM, stock heads, Pacesetter longtubes, 10 PSI from ATI P-1SC Procharger, 60#, 4L60E, Yank3600, 9" 3.73, ET Street 28x12.5x15, 3450lb
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09-12-2008, 09:39 AM #7
Physically they look and almost operate the same. With the exception being that BOV (designed for turbo's) only open when you let off from some sort of boost level. This may be because a turbo is not moving air at idle and the motor is therefore pulling air through it. An open valve would allow unfiltered air to enter the engine.
A supercharger Bypass valve will stay open at idle to allow all the air the SC is moving to vent, decreasing the amount of idle surge and air heating that occurs.
They are different because a SC is ALWAYS moving air, while a turbo doesnt neccessarily move air while at idle.
Now to answer your question, your going to need a larger (think $360-450) Procharger RACE bypass valve or equivalent to vent all the air that an F1 is moving. Especially when you go WOT to redline then let out of the throttle. In such situations, the throttle closes, blocking the airflow. So it reverts and sends a wave of pressure back at the blower. This can damage the head unit itself, along with intercooler end tanks. The purpose of a bypass valve is to allow this wave to vent before it causes damage.
The reason I mentioned the sealing idea is because the inline one from procharger will bleed off a few pounds of boost because it does not seal. It is also too small to vent off the amount of air that an F1 moves.- Justin
Custom tuning with HpTuners and your most common standalones.Originally Posted by WJ Birmingham
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09-12-2008, 10:12 AM #8
Fire67 - thanks
so the procharger race bypass opens instantly when the throttle is lifted? under all situations? how does it get the trigger to open/close the bypass?postion, vacuum, computer?
I'm learning...95 Z28 FORGED 355, JE 8.5:1 PISTONS, 230/239 - .530"/.546", 114 @ 110 CAM, stock heads, Pacesetter longtubes, 10 PSI from ATI P-1SC Procharger, 60#, 4L60E, Yank3600, 9" 3.73, ET Street 28x12.5x15, 3450lb
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09-12-2008, 10:15 AM #9Long Live the Opti
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I have to disagree with everything here. They're vacuum operated valves and open dependent on vacuum. Turbo's move air at idle just like a supercharger, just not in the same manner. I can factually say that my BOV on my Celica (different car, same concept) vents at idle because it's seeing enough vacuum to open the valve. Can't hear my vette's because they're recirculated, but they're probably doing the same. Having held both an ATI Race bypass valve and a JGS 56MM BOV in my hands, I saw almost no difference to make me think they operated differently.
Want proof? Take a look at England Green's latest build on the Corvette Forum. A 402 LS2 based motor with a Procharget, and he's running a Tial 50mm BOV just in front of the TB as his only means of venting.
Just my limited knowledge $.02.
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09-12-2008, 11:23 AM #1010 Second Club
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