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ddillenger
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« Reply #151 on: December 25, 2012, 08:34:30 AM »
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Quick question.
Say one were tuning for ev14 550cc injectors@5bar. With a little math I determined flow rate to be 686.86cc/min. That would put my KRKTE@.0476 correct?
KRKTE = 50.2624*(Liters/Cylinder)/(operating flow rate in cc/min * .684 constant )
Thanks a lot guys.
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« Last Edit: December 25, 2012, 09:01:47 AM by ddillenger »
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s5fourdoor
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« Reply #152 on: December 25, 2012, 03:05:49 PM »
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no. super interesting / related here: http://www.rceng.com/technical.aspxrate@5-bar = (rate@3-bar in lbs/hr)*([unit conversion])*sqrt(5/3) rate@5-bar = 52*10.5*sqrt(5/3) rate@5-bar = 705 cc/min for estimating KRKTE |
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ddillenger
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« Reply #153 on: December 25, 2012, 04:40:20 PM »
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Hmm. With the values I used my LTFT's were within 1 percent. I thought that was DAMN good considering. Thanks again, really appreciate the help.
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s5fourdoor
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« Reply #154 on: December 25, 2012, 07:25:23 PM »
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What were the KRKTE / TVUB values used with 5-bar then?
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ddillenger
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« Reply #155 on: December 25, 2012, 07:46:21 PM »
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TVUB (7, 10, 12, 14, 18V)
2.000 1.011 0.800 0.699 0.611
KRKE .04762
TEMIN .2800
What say you? Definitely open to criticism, nearly all ev14 info I've read here has had something to do with you, so I bow to the experts.
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s5fourdoor
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« Reply #156 on: December 25, 2012, 07:50:49 PM »
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It looks like a good start. Do you find that your idle is lean? That would be my guess based on the numbers.
I am def not an expert, but mildly skilled on this subject. I'm working on putting the bigger pieces together, but I appreciate the hat/tip; good to see other people accelerating their process by using my experience / documentation. Makes me want to contribute more, tbh.
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ddillenger
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« Reply #157 on: December 25, 2012, 08:16:10 PM »
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A little on the lean side at idle, everywhere else is good. Suggestions? I appreciate the input, The main thing is it's safe to drive home. Will post my results once I get some real logging done. Thanks again.
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s5fourdoor
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« Reply #158 on: December 25, 2012, 08:25:28 PM »
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Here's what I'd try:
2.0002 1.0081 0.8001 0.7041 0.6081
Call that our base-case m-box default.
With 4-bar I currently run 26% over that, so moving to 5-bar I'd say you'd theoretically start with 1.40 x base.
Therefore go head and try this:
2.800 1.411 1.120 0.986 0.851
Additionally. Try TEMIN to .25ms, using the calculation I used before.
Try those and see how that looks. I'm anxious to see if you lower your misfire count.
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ddillenger
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« Reply #159 on: December 27, 2012, 03:41:00 PM »
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Thank you sir! I will certainly post results.
(glad I paid attention in math)
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AARDQ
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« Reply #160 on: December 28, 2012, 04:56:40 PM »
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To add to the data set, w/ these injectors (Ford Motorsports, not modified) and 4-bar, my KRKTE is 0.0613 and TVUB is 2.2280 1.4920 1.0520 0.7720 0.5080
Idle trim is -1% and partial is -4%. FKKV=1s. Cold start improved to avoid the brief bucking by increasing KFFWL_0_A / KFFWL_1_A 10%-12% in the -30* to +9.5* range.
I used the O-rings from the original injectors and clips. The O-rings *just* fit all the way in the bores. No vacuum/boost leaks.
These things are amazing. I catch myself looking at the tach sometimes to make sure the engine is still running, it's so smooth.
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« Last Edit: March 22, 2013, 11:24:51 PM by AARDQ »
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em.Euro.R18
Full Member
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« Reply #161 on: January 29, 2013, 04:31:27 PM »
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Just a quick question as far as TVUB calibration goes. What are your thoughts as far as using FKKVS to correct variances in injector latency rather than playing with the manufacturers BVC values. Seems like my ev14 750cc's run alot smoother at manufacturers spec rather than tuning TVUB using STFT's. I can get it to target lambda at idle but part throttle is horrible when corrections are made to TVUB and eventually idle will hunt after sitting a bit. I've heard this is the choice map for most reputable tuners as far as dialing in Injectors for idle/low load situations.
I myself haven't attempted to populate this map. I would start by setting FKKVS, KFLF and similar multipliers to 1.0001. Use o2 corrections with fuel trims disabled to make the corrections to FKKVS. Let me know what you guys think.
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s5fourdoor
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« Reply #162 on: March 22, 2013, 03:43:57 PM »
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Fellow NefMoto'ers. I've recently learned that the "550cc" ev14's we all talk about are actually around 590cc @ 4-bar, our standard FPR setting.
Here are the settings I use nowadays on my K04 B5 S4:
KRKTE:
0.05850
TVUB:
1.6482 1.1121 0.9415 0.8188 0.5841
Enjoy!
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rnagy86
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« Reply #163 on: March 23, 2013, 04:01:08 AM »
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Hey,
It's a good idea to post more values. So here are mine with stock 4-bar FPR, K04'd S4:
KRKTE:
0.05583
TVUB:
3.6991 1.4989 1.0988 0.8001 0.6187
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nyet
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« Reply #164 on: March 23, 2013, 02:11:41 PM »
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EV14 benched at 750cc@3bar, but running 4bar FPR:
KRKTE:
.04840
TVUB:
3.8645 1.6775 1.2268 0.9254 0.7788
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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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