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SB_GLI
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« Reply #45 on: November 02, 2016, 11:51:00 AM »
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You have stock fueling, correct? Stock injectors, stock FPR, stock MAF? In that case you shouldn't touch any fueling parameters.
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golfputtputt
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« Reply #46 on: November 02, 2016, 12:57:48 PM »
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4 bar fpr up from 3 bar.Everything else is stock.
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adam-
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« Reply #47 on: November 03, 2016, 12:47:29 AM »
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Have you changed KRKTE?
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golfputtputt
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« Reply #48 on: November 03, 2016, 09:39:22 AM »
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I have. And also, fuel pump is upgraded, forgot about that. It is not stock. Both the FPR and pump were added because at 11PSI, I was over 100% IDC with only mods being all emissions systems gone, catless, exhaust system, silicone TIP and pod filter. I assumed VW did not build a lot of headroom into the fueling system so I upgraded. I looked for hardware problems but could not find any in the fuel or air intake system.
It seems I need to fine tune KRKTE, my assumption is to decrease this value bit by bit until.... LTFT get close to 0?
current modified KRKTE: 0.08936
Stock 180ps KRKTE: 0.10301
BAM 225ps KRKTE: 0.08358
When Nyet says "pulling fuel" he means more correction for fuel demand that isn't needed. The goal of KRKTE is to reduce this correction, is this correct?
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« Last Edit: November 03, 2016, 09:43:20 AM by golfputtputt »
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vwaudiguy
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« Reply #49 on: November 03, 2016, 10:03:30 AM »
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No offense, but this thread is horrible.
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"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."
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golfputtputt
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« Reply #50 on: November 03, 2016, 10:24:33 AM »
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no offense taken, I'm having a very uncoordinated time learning this material. I appreciate all the help regardless of how horrible the thread is. It's very difficult for me to get a concise picture of how to learn this stuff which makes it difficult putting new bits of information into context.
Until I really wrap my head around the fundamentals and basics and how they apply to real life situations, there may be a few more threads like this with me. I apologize in advance and hope ya'll can bear with me.
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« Last Edit: November 03, 2016, 10:27:54 AM by golfputtputt »
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SB_GLI
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« Reply #51 on: November 03, 2016, 11:04:49 AM »
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IMO, flash a 100% stock file and revert back to 3 bar FPR and take logs.
There is plenty of injector to run a stage II tune with a boost profile simliar to this:
20psi @ 3,000rpm
18psi @ 4,500rpm
14psi @ 5,500rpm
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nyet
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« Reply #52 on: November 03, 2016, 11:06:56 AM »
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No offense, but this thread is horrible.
I'm not convinced it can't be a learning opportunity, since changing KRKTE and TVUB based ONLY on fpr is actually a pretty good starter fueling exercise. |
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SB_GLI
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« Reply #53 on: November 03, 2016, 11:14:47 AM »
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I'm not convinced it can't be a learning opportunity, since changing KRKTE and TVUB based ONLY on fpr is actually a pretty good starter fueling exercise.
Don't forget KVB unless you want your MPG estimate to be off on your cluster (for MKIV's I think only GLI's have MPG in the display). |
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golfputtputt
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« Reply #54 on: November 03, 2016, 11:29:14 AM »
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I personally didn't bother with KVB as I dont have a MFD to my knowledge, passats have the half MFD's, 20th edition and 337's have them along with GLI's. When I get one, I'll mess with KVB. I'm not convinced it can't be a learning opportunity, since changing KRKTE and TVUB based ONLY on fpr is actually a pretty good starter fueling exercise. This is exactly why I did it as opposed to injectors. To test the tuning waters without getting in too deep. Your car will drive pretty close to stock with a higher FPR or pump, injectors can throw off idle characteristics I hear. IMO, flash a 100% stock file and revert back to 3 bar FPR and take logs.
There is plenty of injector to run a stage II tune with a boost profile simliar to this:
20psi @ 3,000rpm
18psi @ 4,500rpm
14psi @ 5,500rpm screencap below is a previous log of my car with 11psi tapered to 8 psi stock boost, stock 3 bar fpr, stock fuel pump, stock injectors, proper measured fuel pressure, emission equipment removed, catless, pod filter, magnaflow catback...115% IDC... |
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« Last Edit: November 03, 2016, 11:42:48 AM by golfputtputt »
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nyet
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« Reply #55 on: November 03, 2016, 11:40:45 AM »
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Your car will drive pretty close to stock with a higher FPR or pump
3 to 4 bar is (in theory) 15% more fuel... which is actually just over the adaptation limit. During idle, not compensating for TVUB properly may (by unintended happenstance) put you within the 5-10% range, which means idle adaption may be fine. Pump makes no difference if you have a properly functioning FPR. |
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« Last Edit: November 03, 2016, 11:44:01 AM by nyet »
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vwaudiguy
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« Reply #56 on: November 03, 2016, 11:41:19 AM »
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IMO, flash a 100% stock file and revert back to 3 bar FPR and take logs.
There is plenty of injector to run a stage II tune with a boost profile simliar to this:
20psi @ 3,000rpm
18psi @ 4,500rpm
14psi @ 5,500rpm
This 1,000x |
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"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."
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golfputtputt
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« Reply #57 on: November 03, 2016, 11:44:10 AM »
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3 to 4 bar is (in theory) 15% more fuel... which is actually just over the adaptation limit. During idle, not compensating for TVUB properly may (by unintended happenstance) put you within the 5-10% range, which means idle adaption may be fine.
so TVUB should? be modified with just a FPR? |
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« Last Edit: November 03, 2016, 11:46:32 AM by golfputtputt »
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nyet
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« Reply #58 on: November 03, 2016, 11:45:16 AM »
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edited my post, my calcs were way off.
No, TVUB should always be adjusted depending on fuel pressure. It is NOT fine to leave it alone. It just happens to be ok if you fail to adjust KRKTE, but the result will be very screwed up fueling since part and idle adaptations will be very different, which is NOT ok.
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« Last Edit: November 03, 2016, 11:48:07 AM by nyet »
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vwaudiguy
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« Reply #59 on: November 03, 2016, 11:47:13 AM »
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I'm not convinced it can't be a learning opportunity, since changing KRKTE and TVUB based ONLY on fpr is actually a pretty good starter fueling exercise.
Sure, but fix the unknown issue first before doing so. This car has a problem, and changing the calibration is absolutely the wrong approach. Just going in circles. |
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"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."
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