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prj
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« Reply #135 on: December 14, 2012, 02:28:38 AM »
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So which numbers are right to that map? Which fuel pressure is right?  |
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hipeka
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« Reply #136 on: December 14, 2012, 03:46:01 AM »
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Which fuel pressure is right? Sorry. I am using stock 4bar fpr. |
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julex
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« Reply #137 on: December 14, 2012, 08:51:09 AM »
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you have to take value and multiply by fuel pressure factor, listed on the sheet.
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hipeka
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« Reply #138 on: December 14, 2012, 09:33:58 AM »
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you have to take value and multiply by fuel pressure factor, listed on the sheet.
For some odd reason those values wont work. If i use those i get idle fuel trim -18% to -15%. |
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rnagy86
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« Reply #139 on: December 14, 2012, 10:19:58 AM »
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For some odd reason those values wont work.
If i use those i get idle fuel trim -18% to -15%.
Did you try the reference TVUB from nehalem? |
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hipeka
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« Reply #140 on: December 14, 2012, 12:44:49 PM »
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Did you try the reference TVUB from nehalem?
You mean this? Sup players! Nehalem back again with your rock-star EV14 injector update. No doubt, Santa arrived early this year!
Lol, anyways. For the standard injectors, here's the deal. EV14 52# @ 3-bar / 60# @ 4-bar. Run the following:
KRKTE: 0.05495
TVUB: 2.5203 1.2695 1.0081 0.8881 0.7654
I have tried this one also. Little better but still very rich at idle. |
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nyet
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« Reply #141 on: December 14, 2012, 12:58:59 PM »
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Not a fan of that TVUB unfortunately... he shouldn't recommend the same TVUB for both 3 bar and 4 bar. Here are my starting points: http://nefariousmotorsports.com/forum/index.php?topic=320.msg18405#msg18405Again, these are starting points. There is no reason to calculate a theoretical value then refuse to change it.. Also reread the whole thread regarding FKKVS as well  |
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« Last Edit: December 14, 2012, 01:02:50 PM by nyet »
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rnagy86
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« Reply #142 on: December 14, 2012, 01:04:57 PM »
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I am running with the following at the moment with stock 4bar FPR:
TVUB
3.6991 1.4989 1.0988 0.8001 0.6187
KRKTE
0.05495
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julex
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« Reply #143 on: December 17, 2012, 08:45:47 AM »
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You, simialar to KRKTE, TVUB changes with rail pressure as well. |
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em.Euro.R18
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« Reply #144 on: December 18, 2012, 10:41:46 AM »
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I've been attempting to dial in my TVUB and KRKTE aswell. 750cc@3bar EV14's, V8 s4 maf, 80mm hemi throttle body GTI
TVUB acquired from Five0motorsports with a calculated KRKTE of .04362
8 2.133
10 1.267
12 .933
14 .667
15 .573
STFT started out at 0% LTFT jumped to 18%. So I adjusted accordingly by multiplying my correction factor being .18 x KRKTE = amount I need to add to KRKTE. I rinsed and repeated with no end in sight.
So back to the drawing board I reviewed some of the logged data... I had seen a lot of the lean condition had to do with idle so based off my idle voltage I used the deadtime value and made some conservative adjustments. I didn't want to over compensate so I took a deadtime value of .667 x .1 = ~ the amount I would need to remove from the whole curve (to ensure I would still have the curve provided). Once I flashed the adjusted TVUB idle started to richen until idle fuel seemed to be correct. THen I was still getting A LTFT of 18% which I kept adjusting and each time I would take a long drive to test it out LTFT's would still call for 15% finally a value of KRKTE of .053 and my idle fuel is bouncing from 20 to -15% at times (usually about 20-30 seconds before it starts to bounce)
The reason why I don't believe that LTFT is correct is because I'm getting a fueling pull of 20%mid - full throttle before boost. I have my multiplyers set to 1.0001. Let me know what you guys think... I thought KRKTE was supposed to be a calculated value not to be messed with assuming your rail pressure is accurate in the calc. I'm compensating for like 35%here somethings off the injector definitely should flow more then a 550cc.
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nyet
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« Reply #145 on: December 18, 2012, 10:52:09 AM »
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Did you scale your MAF? If you didn't, your g/sec is way off.
Do you have a calibration sheet for your MAF? If not, you are guessing anyway, so deviating from the theoretical KRKTE is no different from deviating from the theoretical TVUB or KFKHFM, or MLHFM.
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julex
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« Reply #146 on: December 18, 2012, 11:51:16 AM »
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my tvub is
7 10 12 14 17
4.04051 1.86690 1.35217 1.02680 0.60808
Take it with a grain of salt since I also have non-standard maf which I massaged to work well on my set up. KRKTE 0.051770 for 1000cc @ 3bar Ev14
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em.Euro.R18
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« Reply #147 on: December 18, 2012, 01:04:41 PM »
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Did you scale your MAF? If you didn't, your g/sec is way off.
Do you have a calibration sheet for your MAF? If not, you are guessing anyway, so deviating from the theoretical KRKTE is no different from deviating from the theoretical TVUB or KFKHFM, or MLHFM.
MAF has been scaled using the profile for my maf that tapp provided. Or should I attempt to scale it myself? He has various maf profiles scaled, with the correct offset. I set the multiplier for flowmeter correction to 1.0001 so that I may calibrate it in the future once I had idle together. |
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em.Euro.R18
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« Reply #148 on: December 18, 2012, 01:08:40 PM »
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my tvub is
7 10 12 14 17
4.04051 1.86690 1.35217 1.02680 0.60808
Take it with a grain of salt since I also have non-standard maf which I massaged to work well on my set up. KRKTE 0.051770 for 1000cc @ 3bar Ev14
KRKTE of .051 for 1000cc? holy hell why are these calculated KRKTE's so off. I could understand a variance here or there but I havn't talked to one who has stuck with their calculated KRKTE. Did you modify your TVUB based on voltage? Using loads such as highbeams and whatnot. Seems like a crazy BVC curve. |
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julex
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« Reply #149 on: December 19, 2012, 07:48:00 AM »
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KRKTE of .051 for 1000cc? holy hell why are these calculated KRKTE's so off. I could understand a variance here or there but I havn't talked to one who has stuck with their calculated KRKTE. Did you modify your TVUB based on voltage? Using loads such as highbeams and whatnot. Seems like a crazy BVC curve.
To calculate ballpark of KRKTE you just take your stock injector KRTKE, multiply it by how many times the new injectors are larger than stock ones, stick in the value and street tune from there. As to TVUB... it is street tuned as well. Since the manufacturer data is for 52# injector, it is granted that higher flowing modified Ev14 will have different TVUB due to changed flow. After doing numerous high load pulls to dial KRKTE in (during high injector pulse width > 10ms TVUB corrections are pretty small so you can almost ignore them if they are inaccurate), I concentrated on idle/low load. If I see high corrections at idle with KRKTE already dialed in, it is TVUB that's inaccurate. You correct TVUB until the idle gets in checks and the mid load should also be pretty close to zero. This was covered in several large posts on this site. NEVER EVER trust anybody's KRTKE/TVUB as it will be different for every car you flash it to even with identical hardware... That's the nature of beast. The only thing that needs to be accurate is MAF translation curve or at least be the right one for your maf element so that scaling is right. Even if the housing diameter is off, it can be corrected with KRKTE (and that's why KRKTE is all over the place for most people). |
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