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RaraK
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« on: October 14, 2011, 05:49:46 PM »
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I know we are all ME7.x for the most part here, but there are a few strays working on this, and i know there are some pro's on here that may be of some help.
My current project is a 2008 VW GLI 2.0Tfsi, DSG.
current upgraded parts are a 3" catless downpipe, 2.5" exhaust, neuspeed intake, and uprated factory DV.
I currently have tuned my car like any other ME7.x car, the standard maps, and it has worked out fairly well.
I have kept caution with the HPFP and its limits in stock form, with my requests.
My questions for anyone with input:
During DSG shifts, it will lag/cut boost for about a second and it re spools. I have not caught this in logs to point towards something, but i can supply logs for anyone who may have some ideas. This only does it at higher load levels, usually around 15psi and up.
I will be willing to help in any way i can just ask away, but for a stock turbo running a "stg1/2" equivalent, everything that pertains to ME7 on this site will help you along.
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NOTORIOUS VR
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« Reply #1 on: October 14, 2011, 06:37:46 PM »
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I'm assuming you're talking about the ign cut just before the shift... It probably has more to do with the DSG ECU and it does this (even stock cars, you can hear it it sounds like a "fart") to save the tranny.
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RaraK
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« Reply #2 on: October 15, 2011, 09:10:02 AM »
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it is actually cutting boost, it will drop by 5psi and respool essentially, stock it does not do this, it only does it in higher load situations, like hills for instance. and when running around 15psi or greater.
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Jason
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Breaks everything!
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« Reply #3 on: October 15, 2011, 09:27:06 AM »
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I would suspect there is a torque management model either in the trans ECU that requests a reduction in torque, or in the engine ECU itself reduces torque based on the shift schedule. Does anybody really know how much torque the DSG can reliably handle? Are the clutches sprung or activated inversely by hydraulic pressure requiring a bump in line pressure? BTW, I should have the S4 on the road this weekend so I can finally begin working on MED9  |
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RaraK
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« Reply #4 on: October 15, 2011, 09:53:12 AM »
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From my reading, there are some maps related to the transmission, however i have not read through all of them thoroughly, just a brief. The values in the maps are sufficient though, so i think im looking in the wrong area right now.
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msundercober
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« Reply #5 on: October 16, 2011, 12:47:43 AM »
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look into mwb 020 ( VCDS ) when DSG shifts then you will see that "Zündwinkelrücknahme" is active.
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Jason
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« Reply #6 on: October 16, 2011, 12:35:46 PM »
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I take it that translates into "ignition angle withdrawal" basically?
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RaraK
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« Reply #7 on: October 17, 2011, 08:14:16 AM »
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Yea ill get cracking on this in the next few days, im so busy, i only get like 1 day a week to write a file and log. long process for me right now!
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Tifon
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« Reply #8 on: October 24, 2011, 07:45:13 AM »
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Here another one tuning my MED9.1. Anyone has the MED9.1 documentation?.
BR.
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chirp
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« Reply #9 on: October 24, 2011, 09:59:36 AM »
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Coming over to 2.0 FSI A3 from a B5 S4.
What software and cable are you guys using to read/ write MED9.1?
My A3 Currently has all GI*C files, but I want to tweak a few things.
Thanks!
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RaraK
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« Reply #10 on: October 24, 2011, 12:18:31 PM »
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Coming over to 2.0 FSI A3 from a B5 S4.
What software and cable are you guys using to read/ write MED9.1?
My A3 Currently has all GI*C files, but I want to tweak a few things.
Thanks!
CMD, BDM and OBD2 interface here. i know the MPPS clone i got on ebay does not checksum on write properly, but it does read ok. |
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Tifon
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« Reply #11 on: October 25, 2011, 01:52:24 AM »
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I'm using MPPS clone, but i calculate the checksum before writing.
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RaraK
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« Reply #12 on: October 27, 2011, 11:43:03 AM »
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I'm using MPPS clone, but i calculate the checksum before writing.
what version? mine is the hacked updated v5. it calc's checsum on write? or do you flash with med9.5 which doesnt calc checksum. i tried checksum with winols before write and it still failed to check correctly once written. i found my issue to be a torque limit because of the DSG transmission. I started reading through fdef looking for where that limit might be? rpm vs torque? gear vs torque? any help anyone? there is a TON of reading in regards to this. but its not the end of the world, just gotta read read and read more i guess. |
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msundercober
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« Reply #13 on: October 27, 2011, 12:52:35 PM »
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there are 2 ways to solve this
1st : set DSG Limit up to 500 Nm ( in DSG File )
2st : tell the ECU the DSG has not reached 350 Nm+ ( in ECU File )
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RaraK
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« Reply #14 on: October 27, 2011, 01:31:55 PM »
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there are 2 ways to solve this
1st : set DSG Limit up to 500 Nm ( in DSG File )
2st : tell the ECU the DSG has not reached 350 Nm+ ( in ECU File )
Yes this is what i have realized, i just need to read FDEF and find what part of file to modify to do this! Its a long process at times.
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