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05-27-2005, 07:15 PM
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Friends
Join Date: Dec 2004
Location: Pell City, AL
Posts: 1,371
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FPR + Boost = Busted FPR
My buddy Steven has just added a Procharger to his 87 GT. He had my old Aeromotive FPR on it and after the blower install and seeing some boost he started experiencing a extreme rich condition to the point it would not run without throttling it. I told him to check the vacuum lines to the AFPR and FMU to see if maybe the diaphragms had busted. Sure enough that's what happened. It was a good guess but I've never actually seen it before this.
Is this common? Is there a AFPR that is better suited for boosted applications? Thanks.
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2001 Cobra 'Vert Procharged and Intercooled 455rwhp/441rwtq Work Car: 2005 Honda Odyssey 400 whp Turbo V6, 6-speed, full cage, H&R Suspension, Brembo Brakes |
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05-27-2005, 08:16 PM
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3v's are slow
Join Date: Dec 2004
Location: Here and There
Posts: 17,152
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Re: FPR + Boost = Busted FPR
How much boost was he running? I don't think that it is very common. Could had something to do with age but I wouldn't have thought that particular line would throw out enough positive air to actually burst the diaphragm.
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2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP  2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy |
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05-28-2005, 07:06 AM
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Friends
Join Date: Dec 2004
Location: Pell City, AL
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Re: FPR + Boost = Busted FPR
Quote:
He made a pull to 6000rpm or so. He has a 9 psi pulley installed and only saw 7 psi I think, this is an HCI car. He has a voucher for a 11 psi pulley that he will install before taking it to the dyno, should be good for at least 9psi. He said it even ran fine after that at least for a few miles, so maybe it was more age related and not boost. I bought the AFPR in about 99 or so, so its a few years old.
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2001 Cobra 'Vert Procharged and Intercooled 455rwhp/441rwtq Work Car: 2005 Honda Odyssey 400 whp Turbo V6, 6-speed, full cage, H&R Suspension, Brembo Brakes |
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05-28-2005, 09:20 AM
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Im gonna show her my...
Join Date: Dec 2004
Location: Somewhere providing FREE tech support.
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Re: FPR + Boost = Busted FPR
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I heard it on the internet, so it must be true. "I believe that a person's moral compass can be determined by how he references free men the right to defend themselves." T. Nugent "An armed society is a polite society. Manners are good when one may have to back up his acts with his life." R. Heinlein "Never argue with an idiot. They drag you down to their level, then beat you with experience." -Unknown |
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05-28-2005, 09:37 AM
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3v's are slow
Join Date: Dec 2004
Location: Here and There
Posts: 17,152
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Re: FPR + Boost = Busted FPR
Quote:
exactly
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2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy |
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05-28-2005, 10:03 AM
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#6 |
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Friends
Join Date: Dec 2004
Location: Pell City, AL
Posts: 1,371
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Re: FPR + Boost = Busted FPR
 Size of the diaphragm is the only thing that will dictate what kind of force is being caused by the vacuum. Volume is not an issue considering there is no real flow rate. When you pull a vacuum on your FPR, the air or lack thereof is static under a constant vacuum. Nathan, haven't you had physics? 
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2001 Cobra 'Vert Procharged and Intercooled 455rwhp/441rwtq Work Car: 2005 Honda Odyssey 400 whp Turbo V6, 6-speed, full cage, H&R Suspension, Brembo Brakes |
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05-28-2005, 10:19 AM
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#7 |
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Super Moderator
Join Date: Dec 2004
Location: on the water
Posts: 1,280
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Re: FPR + Boost = Busted FPR
The failure was more likely to age than Boost. A 6yo piece of rubber the has been exposed to gas all its life wont last forever. I am on my 2nd AFPR on my car, one was a paxton and the other is still in use which is an aeromotive.
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2012 Jeep Wrangler Unlimited--- too many mods to list, about to be sitting on 1 ton axles. 2000 Ford F-350 Dually Lariat LE Crew Cab Short Box 7.3 auto 168,000 miles |
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05-28-2005, 12:46 PM
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Daddy x4 ...we're done
Join Date: Dec 2004
Location: Oxford, AL
Posts: 11,551
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Re: FPR + Boost = Busted FPR
Quote:
 Maybe you should go back and take physics again, Brad. :P
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-Brian '86 Mustang GT Convertible '88 Mustang LX coupe '11 Odyssey TE '21 Insight Touring |
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05-28-2005, 01:08 PM
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Friends
Join Date: Dec 2004
Location: Pell City, AL
Posts: 1,371
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Re: FPR + Boost = Busted FPR
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Brian, you're wrong. A vacuum line and intake hose are two different things. A vacuum line is small for quick response, large flow volume is not needed. A larger vacuum line would take longer time to reach boost or vacuum and therefore would delay the necessary tune changes. My intake hose is big because large flow volume is needed.
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2001 Cobra 'Vert Procharged and Intercooled 455rwhp/441rwtq Work Car: 2005 Honda Odyssey 400 whp Turbo V6, 6-speed, full cage, H&R Suspension, Brembo Brakes |
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05-31-2005, 08:35 AM
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#10 |
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The Kocky One
Join Date: Dec 2004
Location: Yeah, but those cutters won't bust any walnuts.â„¢
Posts: 1,948
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Re: FPR + Boost = Busted FPR
Even stock FPR can/do go bad over time, with or without boost. Just one of those things...
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For Sale: Reproduction Window Stickers, 87+ Mustangs, Cobras, Lightnings, and HD F150! Richard White 93 Cobra Kocky will be back! 
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