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06-20-2018, 01:17 PM | #1 |
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F10 N55 Rail pressure
Reading my F10 N55 rail pressure at idle reads 1000psi. When I turn car off and then turn just the ignition on I can see the rail pressure climb from 1000 to over 3200psi.
After cars warmed up I shut it down for an hour. I restart car and it idles rough with a few misfires (Misfires/ rough idle Shown in ISTA) and then it smoothies out a little. Does 3200psi rail pressure sound normal after car sits for an hour ? Is rail pressure readable with just ignition on and car off?
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06-20-2018, 03:09 PM | #2 | |
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06-20-2018, 04:36 PM | #4 | |
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Btw... what model car u have? Year?
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06-20-2018, 04:38 PM | #5 |
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06-20-2018, 04:41 PM | #6 |
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Yup. Me too. 2014 535i PWG. I'm only getting 1000 psi at idle. Will post up pics in 10 min
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06-20-2018, 04:43 PM | #7 |
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Ur first pic say " just hooked it up". That means ignition in the off position ? Or was ignition on but did not start car? I want to make sure I do it exactly the same way you did
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06-20-2018, 04:53 PM | #8 | |
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My reading are about 700 psi lower than yours at idle. Ur cars stock HPFP right?
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06-20-2018, 04:58 PM | #10 |
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Damnit..... and my fuel pressure with just the ignition on is at about 1050 psi right now but goes up about 1psi every 5 seconds. It's at 1088psi right now. Was 1050 about a minute ago. Now 1095psi lol. And going......
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06-20-2018, 05:09 PM | #12 |
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LoL. Mine was at about 1000psi at idle with car started. Ur was at about 1700psi at idle with car started. That's a big difference between them. What MHD Map are u running?
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06-20-2018, 05:12 PM | #14 |
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Ok. I'm on a Custom MHD 2+ Map but rail pressure at idle should be in affected
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06-20-2018, 05:13 PM | #15 |
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06-21-2018, 09:51 AM | #16 |
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I think I figured out why our rail pressure is different. When u got ur readings ur was in Cold Start and idle was up? My car at clod start is 1700psi rail pressure. Then when it drops to 750rpm I hit 1000psi. Can u verify I was correct?
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06-21-2018, 02:33 PM | #17 |
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yes the car was cold... do you want me to check when the car is warm or after the cold start and wait about a minute?
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06-21-2018, 02:36 PM | #18 | |
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06-22-2018, 06:21 AM | #19 |
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ssgm1x, who is doing your cusom MHD mapping, and how much did it cost? So, I have been sending my logs to MHD and after looking at my last log they are suggesting I mix 1 gallon of E85 to a full tank of 93 octane fuel. Mind you I am already running 93 octane on a 91 octane fuel tune, and according to MHD I have pretty bad quality fuel. My car pulls but I want to run 93 octane tune but the timing pull is worrying me.
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06-22-2018, 09:54 AM | #20 | |
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06-22-2018, 03:13 PM | #22 |
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JW Tuned is a tuner that does Custom MHD maps. If u r having timing issues then i suggest u get a custom tune to address ur issues. Custom tunes cost about $300-$500 on average and can easily resolve ur timing issues. OTS maps are basically a one size fits all map for ur car. I went custom to fix overboost/throttle closures/timing issues.
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