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Registered
Join Date: Mar 2008
Location: Chatsworth, Ontario, Canada
Posts: 561
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Rising rate FPRs...
They run off the vacuum, and increase fuel as vacuum increases = good top end performance.
Anyone running one? Pros/cons? Beneficial to a chipped NA for more gusto? Discuss.
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Rick Harrison 1988 944S 17 inch Cup 2's, euro bumper conversion Magnaflow 2 1/2" exhaust with K & N 4 inch custom intake MaxHP chipped |
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10-06-2009, 07:39 PM
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Registered
Join Date: Jan 2009
Posts: 224
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Um...I thought all FPR's were like that - hence the vacuum connection. If the pressure stayed the same at all times the there'd essentially be no need for that, correct?
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10-06-2009, 08:27 PM
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Registered
Join Date: Sep 2006
Location: In my office
Posts: 337
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There are two types of fuel pressure regulators, rising rate and manually adjustable. The stock fpr is a rising rate. Fuel pressure decreases as vacuum increases. In the case of a turb, fuel pressure increases more as boost comes on and vacuum lines become boost lines.
A lot of aftermarket chips are mapped toward a 3.0 bar fpr on the turbos to provide more fuel delivery at higher boost pressures. Some are designed for stock pressure and less boost. Most all NA chips are designed around the stock FPR. You have to drastically increase the air flow of your engine (as with forced induction) to need a higher fuel delivery volume that your stock injector/FPR combo will supply. Regards, Russell |
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10-06-2009, 08:42 PM
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Registered
Join Date: Mar 2008
Location: Chatsworth, Ontario, Canada
Posts: 561
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See I learned sumtin today.
What a dumbass. 
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Rick Harrison 1988 944S 17 inch Cup 2's, euro bumper conversion Magnaflow 2 1/2" exhaust with K & N 4 inch custom intake MaxHP chipped |
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10-07-2009, 06:10 AM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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Hey, asking questions and learning is smart.
It's the blind actions that break stuff and/or spend money on useless upgrades that's dumb. ...and now everyone else knows why they would or wouldn't need a different FPR as well. 
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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10-08-2009, 07:43 AM
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Registered
Join Date: Mar 2008
Location: Chatsworth, Ontario, Canada
Posts: 561
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If I turbo or SC my NA...I'll need an adjustable.
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Rick Harrison 1988 944S 17 inch Cup 2's, euro bumper conversion Magnaflow 2 1/2" exhaust with K & N 4 inch custom intake MaxHP chipped |
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10-08-2009, 09:17 AM
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Registered
Join Date: Jun 2006
Location: O.C. CA
Posts: 4,587
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while i tend to agree that more fuel pressure won't generally help much on a 944, due to mere bolt on modifications, we have to add more pressure to get the right mixture on the 968 - still normally aspirated too - it's even more of a problem with bigger cams - the closer we get to 300hp, the more fuel it needs
if you think you're getting near the edge though, it's easy to find out where you are - just take it to a dyno and look at the A/F charts |
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10-08-2009, 09:38 AM
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