[ssgm1x]

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?

[ey2001]

Originally Posted by ssgm1x

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?

I could check for you... so you just need to know what it is when the car is on position right?

[ey2001]

First pic before anything...just hooked it up... second pic started the car... third shut it off... and then on position

[ssgm1x]

Originally Posted by ey2001

First pic before anything...just hooked it up... second pic started the car... third shut it off... and then on position

Wow. Different than my readings. Will post up new readings in 30 min. Car been sitting 6 hours. We shall see what it reads.
Btw... what model car u have? Year?

[ey2001]

Originally Posted by ssgm1x

Wow. Different than my readings. Will post up new readings in 30 min. Car been sitting 6 hours. We shall see what it reads.
Btw... what model car u have? Year?

2014 535i pwg 6spd

[ssgm1x]

Originally Posted by ey2001

2014 535i pwg 6spd

Yup. Me too. 2014 535i PWG. I'm only getting 1000 psi at idle. Will post up pics in 10 min

[ssgm1x]

Originally Posted by ey2001

2014 535i pwg 6spd

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

[ssgm1x]

Originally Posted by ey2001

First pic before anything...just hooked it up... second pic started the car... third shut it off... and then on position

Ok here are my reading. 1st pic just plugged it in. 2nd pic turned car on. 3rd pic turned car off then ignition on.
My reading are about 700 psi lower than yours at idle. Ur cars stock HPFP right?

[ey2001]

yup stock HPFP

[ssgm1x]

Originally Posted by ey2001

yup stock HPFP

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......

[ey2001]

when it was on position it was going from 1776-1777 and going back and forth....

[ssgm1x]

Originally Posted by ey2001

when it was on position it was going from 1776-1777 and going back and forth....

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?

[ey2001]

stage 1

[ssgm1x]

Originally Posted by ey2001

stage 1

Ok. I'm on a Custom MHD 2+ Map but rail pressure at idle should be in affected

[ssgm1x]

Originally Posted by ey2001

stage 1

Thanks for helping me out!!!!!

[ssgm1x]

Originally Posted by ssgm1x

Thanks for helping me out!!!!!

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?

[ey2001]

Originally Posted by ssgm1x

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?

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?

[ssgm1x]

Originally Posted by ey2001

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?

It's ok. Pretty sure we have same exact reading. All good bro. Thanks again!!!!

[harris69]

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.

[ey2001]

Originally Posted by harris69

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.

He is on jwtuned...

[harris69]

Originally Posted by ey2001

He is on jwtuned...

Sorry to sound ignorant but what exactly is jwtuned and how do i find him?

[ssgm1x]

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.