yrodin
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« Reply #15 on: March 16, 2011, 07:35:47 PM »
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so are those latency times in the ford chart calculated at 39psi? if so how can they be converted for 43.5psi? or would they be the same?
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julex
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« Reply #16 on: March 17, 2011, 08:39:20 PM »
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so are those latency times in the ford chart calculated at 39psi? if so how can they be converted for 43.5psi? or would they be the same?
"44.95 1.1768" This says that latencies must be multiplied by 1.1768 for 44.95psi (closest to 4bar in thespec sheet). The more fuel pressure, the more injector has to work against it delaying full opening of the valve. |
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Twiki
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« Reply #17 on: March 20, 2011, 01:47:51 PM »
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Hi Guys,
Just a question on the Siemens injectors - are the 630cc injectors mentioned here the same as those that the B5 RS4 uses? Just trying to figure out which injectors are refered to here... I have a set of injectors which is supposed to be from the RS4 and they say Siemens Deka, but I don't have any other specs on them...?
Thanks
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prj
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« Reply #18 on: March 30, 2011, 01:32:01 AM »
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so are those latency times in the ford chart calculated at 39psi? if so how can they be converted for 43.5psi? or would they be the same?
"44.95 1.1768" This says that latencies must be multiplied by 1.1768 for 44.95psi (closest to 4bar in thespec sheet). The more fuel pressure, the more injector has to work against it delaying full opening of the valve. Just wanted to say, that you can punch those values into Excel and fit a curve, then get the correct multiplier for 4 bar... |
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julex
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« Reply #19 on: April 01, 2011, 07:39:33 AM »
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overspeed
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« Reply #20 on: April 01, 2011, 04:03:47 PM »
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I use 5 of these in my fivetech...
in the main page :
Gain: 0.11ms/mg
Offset: 0.055ms
Turn on time @ 14VDC: 1.14ms
Turn off time: 0.85ms @ 600KPa
in the spec sheet:
Gain: 0.11ms/mg
Offset: 0.67ms (more tha 10x !)
Turn on time : 1.3ms (more than 14%)
Turn off time: 0.7ms (17% less !)
It
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judeisnotobscure
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« Reply #21 on: April 11, 2011, 05:26:18 PM »
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So i plugged the values from the spec sheet into excel. I graphed at 2.66 bar and at 4 bar I used a correction factor of 1.211 to get the 4 bar values. You could use the 2.66 bar formula and come up with your own correction factor if you don't like mine.
to determine voltage offset (ms) for voltages not listed in the spec sheet use these formulas
Y= Voltage
X= voltage offset (ms)
@ 2.66 bar
Y= -4.419* ln(x) -9.9033
@ 4 bar
Y= -4.419* ln(x) -10.749
here are the values I got for 4bar
7.04 2.314814
10.0672 1.166826
12.0384 0.747
14.08 0.47058
17.8816 0.19907
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« Last Edit: April 25, 2011, 06:00:49 AM by judeisnotobscure »
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I have a b5 s4
but i just want to dance.
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judeisnotobscure
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« Reply #22 on: April 12, 2011, 04:06:15 PM »
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How do you go about calculating the proper temin (minimum injector on time) based off the spec sheets? I would think it should be MinPW (minimum repeatable pulse width) x (the pressure correction factor that is applied to the voltage table). so for the siemens 60lber's to go from 2.66 bar which is what the calibration data should it be multiplied by 1.211 to get to 4 bar? Makes sense when I think about it but the values seem too high.
*edit
I found how to get temin in one of tony's posts.
New Temin is (old temin)* (old flow rate) / (new flow rate) then i don't think this time should be any less than the minpw listed in the spec sheet, but corrected for fuel pressure.
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« Last Edit: April 13, 2011, 04:37:58 AM by judeisnotobscure »
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I have a b5 s4
but i just want to dance.
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yrodin
Newbie
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« Reply #23 on: April 17, 2011, 11:34:19 AM »
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So I'm still having some trouble understanding how to convert the latency numbers to 4 bar. Can someone please list them for me for the following voltages:
16v-
14v-
12v-
10v-
8v-
Thanks
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julex
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« Reply #24 on: April 18, 2011, 11:56:44 AM »
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So I'm still having some trouble understanding how to convert the latency numbers to 4 bar. Can someone please list them for me for the following voltages:
16v-
14v-
12v-
10v-
8v-
Thanks
"teach a man to fish..." Anyway, if you only read the whole thread... couple of posts up "judeisnotobscure" posted a screenshot with what TVUB values he used in his tune after interpolating all the voltages needed. |
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elRey
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« Reply #25 on: January 30, 2013, 04:45:02 PM »
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If you increase the idle RPM and load...
What's the best way to do this? |
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Bische
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« Reply #26 on: January 31, 2013, 02:15:38 AM »
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What's the best way to do this?
Idle torque, KFMRES if the memory serves. |
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elRey
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« Reply #27 on: January 31, 2013, 08:15:41 AM »
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That is torque reserve @ idle. Tony suggests increase torque (I assume requested torque), but doesn't mention torque reserve. Not sure is this is what he meant.
Thanks though.
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nyet
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« Reply #28 on: January 31, 2013, 10:32:47 AM »
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I think he is talking about idle torque reserve.
obviously, you can't increase actual torque; a stable idle is one that supplies as much torque as is required to keep the rpm consistent given the constant load on the motor at idle.
However, if you increase idle torque reserve (which is the amount of instantaneous torque from timing increase available at idle), it will pull timing, and you'll need both more air and fuel to make the same torque (at a given RPM), which brings up idle load (at a given RPM).
Of course, this is my understanding of torque reserve. I could be completely wrong.
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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Bische
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« Reply #29 on: January 31, 2013, 10:38:48 AM »
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I think he is talking about idle torque reserve.
obviously, you can't increase actual torque; a stable idle is one that supplies as much torque as is required to keep the rpm consistent given the constant load on the motor at idle.
However, if you increase idle torque reserve (which is the amount of instantaneous torque from timing increase available at idle), it will pull timing, and you'll need both more air and fuel to make the same torque (at a given RPM), which brings up idle load (at a given RPM).
Of course, this is my understanding of torque reserve. I could be completely wrong.
Also my exact understanding, I have also compared logs of when I have made changes to KFMRES, and the data confirmed. |
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