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Old 09-27-2014, 11:10 AM   #1
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Adjustable fuel pressure regulator

Anybody tune using an adjustable fuel pressure regulator? I'd like to see how adjusting fuel pressure affects fuel trims and torque...so I'm looking for an adjustable fuel pressure regulator. Anybody done this?
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Old 09-27-2014, 11:52 AM   #2
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+1.....but I believe this will only be applicable to 2.5 non e-gas car
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Old 09-27-2014, 03:00 PM   #3
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Jaykay, Is it ECU (5.2.2) that is causing the issue with the fuel pump? I am installing a 996 3.4 in my 98 boxster and after reading your comment am wondering
if my fuel pressure is going to be too low after the install?? Thanks
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Old 09-27-2014, 03:13 PM   #4
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Pedro has one for sale on his web site.....it's only for use on 2.5 non egas cars

I was just inferring that egas cars may not benefit from this component but I don't know.......it may be an automatic function on an egas car. Perhaps someone that has done a lot of work on the two type of fuel systems can chime in

Wouldn't the the 3.4 come with the appropriate fuel pressure regulator for its airflow? It might even be the same as the 3.2 ......ah but your engine will have a throttle cable
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Old 09-27-2014, 05:11 PM   #5
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Found this over at Pelican...
2000 Porsche Boxster S Convertible - Fuel System - Page 2

I'm assuming that our cars are set up to be a compromise between power drivability and economy. After modding for power, not worried about Economy etc, I'd like to be able to add a bit more fuel and do some testing.
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Old 09-27-2014, 06:46 PM   #6
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afr and fuel pressure will be fine up to say 4000 rpm when the engine is running closed loop (the ecu wants an afr of 14.1:1 and the narrow band o2 sensors will tell it if it is getting it or not); you'll get a cel if you're not getting enough. at wot the ecu goes open loop and the o2 sensors are useless as the ecu is trying to make an afr of 12.5 or so. only way to know if you are getting enough fuel is if you run an aftermarket wideband o2 system.
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