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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 01-12-2009, 07:55 PM   #1
WilkesE46
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Adj. Fuel Pressure Regulator

Just out of curiosity, since most E46's feature a fuel pressure regulator built directly into our fuel filter (I was examining my replacement unit this morning and noticed it), is there anyway to hook up an adjustable fuel pressure regulator for situations where we have hit the stock limit?
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Old 01-13-2009, 09:20 PM   #2
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Any thoughts?
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Old 01-14-2009, 06:24 AM   #3
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Originally Posted by WilkesE46 View Post
Just out of curiosity, since most E46's feature a fuel pressure regulator built directly into our fuel filter (I was examining my replacement unit this morning and noticed it), is there anyway to hook up an adjustable fuel pressure regulator for situations where we have hit the stock limit?
That's a pretty vague question.

What are you planning on doing that you "think" you might need one.
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Old 01-16-2009, 04:36 PM   #4
WilkesE46
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well I was thinking, in the case of forced induction, how have others dealt with fuel issues? How would we go about installing an adjustable unit in our cars? Is it possible? That was really my question
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Old 01-16-2009, 10:04 PM   #5
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I have a little trick we use at the shop, the fuel pressure regulator on the stock fuel filter is adjustable...... but only once maybe twice and only up.
The way most regulators work is they adjust the spring pressure on the backside of the diaphram sooooo. Get a bar clamp as long as the filter, your gonna use this to squeeze the regulator. Take a 16mm or so size socket and center it on the end of the regulator, on the other end take a piece of wood 2X4 and drill 2 holes in it where the two hose connections need to stick through cause you DON'T want the press on the end of the hose connections. Jig this contraption up in the car with a pressure gauge on the outlet end and fire up the pump, or you can just cycle the key to kick it on. Crank in on the bar clamp and watch the pressure rise .

I know this sounds like an accident waiting to happen but it really works and if its worth it to you I have found that with a straight through design muffler a little pressure helps, I run my 330 at 60psi. But with stock exhaust any more pressure and its wayy too rich.
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Old 01-18-2009, 12:51 PM   #6
WilkesE46
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haha, thanks for the DIY f1004fun, but I was actually eyeing an adjustable fuel pressure regulator from SARD racing out of japan to potentially place on my 330ci. I was hoping you guys would be able to let me know how this might be done:
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Old 01-19-2009, 08:26 PM   #7
WilkesE46
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So do you guys think that SARD unit would be able to fit? If so, how? This regulator seems to be in my budget
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Old 01-20-2009, 10:07 AM   #8
NickG@TechniqueTuning
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Originally Posted by F1004fun View Post
I have a little trick we use at the shop, the fuel pressure regulator on the stock fuel filter is adjustable...... but only once maybe twice and only up.
The way most regulators work is they adjust the spring pressure on the backside of the diaphram sooooo. Get a bar clamp as long as the filter, your gonna use this to squeeze the regulator. Take a 16mm or so size socket and center it on the end of the regulator, on the other end take a piece of wood 2X4 and drill 2 holes in it where the two hose connections need to stick through cause you DON'T want the press on the end of the hose connections. Jig this contraption up in the car with a pressure gauge on the outlet end and fire up the pump, or you can just cycle the key to kick it on. Crank in on the bar clamp and watch the pressure rise .

I know this sounds like an accident waiting to happen but it really works and if its worth it to you I have found that with a straight through design muffler a little pressure helps, I run my 330 at 60psi. But with stock exhaust any more pressure and its wayy too rich.
What you did, raising the fuel pressure, was a complete waste of time and money. By raising the fuel pressure, you richened up the mixture. The ECU will detect this richer mixture (via the oxygen sensors during closed loop operation) and adapt to it (lambda adaption will be negative, ie, it's pulling fuel out). The net result, after lambda adaption settles, is the EXACT same fueling and mixture that you had with the stock fuel pressure regulator.
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Old 01-20-2009, 01:19 PM   #9
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On the other hand, you can raise it enough that it'll just keep setting off the check engine light.
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Old 01-25-2009, 06:38 PM   #10
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I forgot to mention that I have a Unichip installed, I have tuned that adaptations back to zero and adjusted the open loop to an even 13:1, I use the OT-1 from Innovate to datalog a wideband input and the DME's fuel trims with RPM to read back and adjust the Unichip. We have been doing the supercharged Mini's like this also and it's been working pretty good.

As far as the fuel pressure deal I wanted a better spray without spending any money so I just bumped up the pressure.
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