nox79
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« Reply #600 on: March 29, 2015, 08:24:54 AM »
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Anyone have CANBUS log to read the immo data vía OBD?
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AngelPowy
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« Reply #601 on: March 30, 2015, 04:01:06 AM »
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Hi mates, I want to react on your post. I have recently done a tune on a mkV gti, and I have a matter with fuel pressure. With low boost I have a pressure drop of (10bar) between 5200 to 5700 rpm. And With High Boost I have 50bar drop between 4500 to 5800 rpm. Do you have any idea? Do you think that hpfp is going out? Our can it be a problem with the fuel circuit?
Cordially.
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Beaviz
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« Reply #602 on: March 30, 2015, 05:47:41 AM »
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Hi mates, I want to react on your post. I have recently done a tune on a mkV gti, and I have a matter with fuel pressure. With low boost I have a pressure drop of (10bar) between 5200 to 5700 rpm. And With High Boost I have 50bar drop between 4500 to 5800 rpm. Do you have any idea? Do you think that hpfp is going out? Our can it be a problem with the fuel circuit?
Cordially.
You certainly do not have a pressure drop of 10bar on the low pressure side!  Low pressure is < 10 bar. What setup is the car running? Is the drop you mention requested - actual? |
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majorahole
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« Reply #603 on: March 30, 2015, 07:53:37 AM »
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he meant with low boost, not on the low pressure fuel system
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Beaviz
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« Reply #604 on: March 30, 2015, 11:22:33 AM »
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My bad not paying attention.
Without further information my guess is that the stock pump is just maxed out.
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majorahole
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« Reply #605 on: March 30, 2015, 12:59:27 PM »
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My bad not paying attention.
Without further information my guess is that the stock pump is just maxed out.
ya. seems kinda late in the revs, but probably |
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AngelPowy
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« Reply #606 on: March 31, 2015, 05:24:52 AM »
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Yes the pressure drop was on HPFP side by low turbo boost pressure. Thanks for the correction. The car only have decat fitted, with cts turbo intake. The car is running with a moded file. I am guessing that HPFP is over too. The matter is that I have not increase fuel pressure more than stock (110 bar). Do you think that with a S3 HPFP we will solve this problem?
Best Regards
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Beaviz
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« Reply #607 on: April 01, 2015, 01:03:11 AM »
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The S3 pump is identical to all other HPFP's. They actually all use the same Hitachi pump. Only option is to upgrade it with some aftermarket parts or buy a complete upgrade pump.
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majorahole
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« Reply #608 on: April 03, 2015, 07:22:31 AM »
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Injectors will not help. The HPFP will still be the bottleneck no matter what injectors you use. thinking about this, then what's the point of s3 or rs4 injectors, if they won't flow any more fuel at the same injection time?? |
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AngelPowy
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« Reply #609 on: April 03, 2015, 10:58:32 PM »
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IMHO for the same pressure as they are larger, they allow a biggest flow of fuel (IF HPFP is able to keep high pressure in despite of this flow request bigger).
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Beaviz
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« Reply #610 on: April 04, 2015, 01:38:39 AM »
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thinking about this, then what's the point of s3 or rs4 injectors, if they won't flow any more fuel at the same injection time??
They do flow more at the same injection time. The limitation is in how much fuel the HPFP can supply, especially in lower RPM. In the higher RPM range even the stock pump can supply enough fuel to much larger turbos than stock. |
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majorahole
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« Reply #611 on: April 05, 2015, 07:23:07 AM »
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IMHO for the same pressure as they are larger, they allow a biggest flow of fuel (IF HPFP is able to keep high pressure in despite of this flow request bigger).
ahhh I get it, if they flow more its harder to keep pressure up |
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stabilo
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« Reply #612 on: April 20, 2015, 12:41:37 AM »
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Hi mates, I want to react on your post. I have recently done a tune on a mkV gti, and I have a matter with fuel pressure. With low boost I have a pressure drop of (10bar) between 5200 to 5700 rpm. And With High Boost I have 50bar drop between 4500 to 5800 rpm. Do you have any idea? Do you think that hpfp is going out? Our can it be a problem with the fuel circuit?
Cordially.
Hi ! On many MKV GTI, there were problems of intake camshaft with models from 2006 to 2008. Check first the camshaft revision you have following this DIY: http://forums.vwvortex.com/showthread.php?3754451-How-to-check-which-cam-revision-you-have-DIYThen if it's the good rev (B) you may look your fuel filter and then the HPFP I had the same problem on my '06 MKV, I decided to change the HPFP camfallower, the HPFP and the fuel filter. I still have this 40-60bar drop with a tuned file and 10bar drop with original file. I have to change the camshaft   |
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baldy
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« Reply #613 on: April 23, 2015, 11:28:19 PM »
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So I have a question for the tuning gods here...
I have a k04 on my b7 a4, along with all supporting mods and then some (I'll put the list at the bottom). Car is a tiptronic, quattro.
Issue I'm having is there is a lot of timing pull, regardless of fuel used, and on both of the K04 tunes I have from my tuner. The only thing that stands out on the logs is actual load is always higher than specified. I logged mvb 206 and the values are off there as well between spec'd and actual, along with the scaling/compensation (what I was told that column is) showing at 1.19. Replaced MAF, plugs, fuel and air filters, and did a carbon clean and made the MAF numbers higher, and the low power issue worse. Today it went into some sort of limp mode and pulled out -12 even at idle on all cylinders, as well as pulling overall timing too.
My question to you guys is what could be the cause of this in the tune? On the stock file, the car runs fine and fuel trims are 1.3 and 2.8. On the tune, the trims are 4 and 17%. On the custom revision for me the trims are -0.3 and 7%
I have attached the logs of when the car is running in normal mode and when it's in limp, as well as a comparison log of the 2 files (prior to carbon clean, so the MAF is reading 10 g/s lower or so up top).
Any insight would be greatly appreciated.
K04, turbo muffler machined off, S3 injectors, Autotech HPFP, RS4 LPFP controller, RS4 PRV, R8 coilpacks, PFR8S8EG plugs gapped to .028, ER Dual SMIC, BSH PCV delete, full 3" exhaust, S3 DV relocate to before TB, 034 silicone hoses for intercoolers and turbo inlet, stock airbox with S4 filter and 3.2 duct.
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« Last Edit: April 23, 2015, 11:39:01 PM by baldy »
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AngelPowy
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« Reply #614 on: April 24, 2015, 09:30:29 AM »
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I want to know to someone have already face to a power loss on 5/6 gear on a 200 tfsi engine? I am currently learning TFSI tune on a mkv GTI. I have lot of couple on low gear (1/2/3/4) but 5/6 it seem's like I have a power loss. I think that maybe the turbochargers is a low one and I ask for too much pressure at high rev (1.2 bar boost at 5000 rpm). At high rev turbo have much harm to keep pressure (1.1 bar reach not more). I am going to seek if IC hose isn't the matter.
Do someone have already experience this? Maybe my tune is wrong. I can provide my file if needed.
Current Modification on the car
Full 70mm exhaust with decat
CTS turbo Intake.
Best Regards . AngelPowy
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