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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 04-13-2008, 10:35 PM   #1
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Fuel pressure regulator

I see that some tuners install a 3.5bar fuel pressure regulator when they upgrade the software. The time has come to do the software on my car and i was wondering if i need to do this? And what exactly it does?
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Old 04-14-2008, 12:27 AM   #2
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It allows for the fuel to be even with the boost. Boost alone will not give you what you want without fuel. More boost needs more fuel to get more ponies from the engine.
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Old 04-14-2008, 03:07 AM   #3
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It also depends on what tuner you're going with. Some use the 3.5 bar, others use just a 3.0.
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Old 04-14-2008, 04:27 AM   #4
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Nordic uses a 3.5, pretty sure others do not except sqr when it comes to their 18t tune on a 2.0.
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Old 04-14-2008, 05:22 AM   #5
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Originally Posted by lms View Post
Nordic uses a 3.5, pretty sure others do not except sqr when it comes to their 18t tune on a 2.0.
Ok so 3 bar is probably right hey?
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Old 04-14-2008, 01:07 PM   #6
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Forgot to add, my old stage 3 plus from jak was tuned via mailbox with a 3.5. So I would not get one unless the tuner says to.
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Old 04-14-2008, 01:26 PM   #7
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where would you get one?
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Old 04-14-2008, 01:53 PM   #8
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genuine saab has them.
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Old 04-14-2008, 06:56 PM   #9
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what about for a T5 car?
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Old 04-14-2008, 08:59 PM   #10
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Forgot to add, my old stage 3 plus from jak was tuned via mailbox with a 3.5. So I would not get one unless the tuner says to.
Ok cool will check with the tuner first. Thanx.
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Old 04-16-2008, 04:58 PM   #11
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just curious but wouldn't a fully adjustable FPR be the way to go so if need be you can change it without having to get a whole new FPR?

kinda of thinking of doing that on my Vig and the g/f aero.

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Old 04-17-2008, 08:43 AM   #12
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Changing fuel pressure without altering the software will get you nothing but a mess.
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Old 04-17-2008, 11:02 AM   #13
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Ok cool will check with the tuner first. Thanx.
Yea, what Nick said... The fuel pressure regulator has to be matched to the sw and if the tuner has the set-up tuned for a standard 3.0 bar fpr and you put a 3.5 bar, the fuel maps will now be wrong and the car will not run as intended by the tuner.

There are two ways to do it, either you re-map with more fuel with stock 3 bar fpr or you map it with a higher fpr and use the right amount of fuel for that fpr.

If you are running out of fuel injector or have a high duty cycle, you can up the fuel pressure and not have to get crazy with high duty cycle. If you are not on the edge with you're fuel injectors, there is no reason to use a higher pressure fpr.

Sw needs to be matched to fpr, chaging the fpr without matching the sw could cause a lot of rich areas and mess it all up as Nick said..

John
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