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Old Oct 6, 2007 | 08:05 PM
  #1  
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From: grandrapids mi
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Hey guys just want some advice on this F1A kit. Does anyone know how much boost i might see using 4.75 headunit and a 7.25 crankpulley.Im trying to keep the boost down cause of my stock internals.I know this is a big blower but its what i will need when i go big. My compression i think is 9.5to1 with my AFR 225 72cc heads.Any advice would be great.
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Old Oct 7, 2007 | 01:20 AM
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From: paducah, ky
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stock internals needs a d1sc.... you wont be able to keep it slowed down enough..
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Old Oct 7, 2007 | 02:19 AM
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Do a search for KP. He has all the boost/pulley combos.

PM sent on the 07 R1.
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Old Oct 7, 2007 | 06:01 AM
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We sold an F1A kit to a local customer with an '04 GTO with stock internals. He had a custom 5.50" blower pulley made for the head unit, and now he's seeing 7 psi of boost. Bob
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Old Oct 7, 2007 | 10:46 AM
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A 7.25/4.75 should work since you have lower compression and assuming the cam in your sig is a 112-114LSA. Most likely put you around 9-10psi, which is a lot on a stock bottom end, wont be the most efficient thing on earth but should work.

Since you are using a 7.25 crank pulley I assume its an SDCE setup? I ask since I had a hard time getting a 4.25 blower pulley on with the SDCE, had to do a bunch of grinding on the brackets.
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Old Oct 7, 2007 | 01:22 PM
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From: grandrapids mi
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Ok that pretty much sums that up. I think im gonna give it try and see what happens.Boost is gonna be my friend and if not i can always build another motor. Thanks guys.
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Old Oct 10, 2007 | 06:49 AM
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From: guam
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kp, your car is super badass !!!
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