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Author Topic: DSG DQ500  (Read 36398 times)
bk56190
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« Reply #60 on: April 17, 2020, 11:24:15 PM »

Damn, so I suppose one of the 2d maps IS a limiter. Don't know which one, but if you know the currently speed for upshift, you can search and try, difficult without the FR.
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IamwhoIam
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« Reply #61 on: April 18, 2020, 02:08:09 AM »

That's really hard man, daaaaaamn, wow, condolences, sorry for your loss, duh sorry bra.
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I have no logs because I have a boost gauge (makes things easier)
Piar
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« Reply #62 on: April 18, 2020, 08:09:36 AM »

Guys! i have a problem with full throttle shift
car is shifting earlier than i want/ i have found 25 SHALT tabele 3d maps 14*21

but during testing car still shift earlier
who knows dq500 logic and can help?
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nmerdan
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« Reply #63 on: October 27, 2020, 02:56:22 PM »

Does anyone have any pointers of what CAN frame IDs are used for clutch pressures on a PQ35 car with DQ500?
« Last Edit: October 27, 2020, 03:02:21 PM by nmerdan » Logged
aef
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« Reply #64 on: October 28, 2020, 04:18:04 AM »

Guys! i have a problem with full throttle shift
car is shifting earlier than i want/ i have found 25 SHALT tabele 3d maps 14*21
but also i have found 3 2d maps, which located at #26A34 #28364 #269E0 which seems to be full throttle shift tables because it have 2 byte size
but during testing car still shift earlier
who knows dq500 logic and can help?

same problem here

can you say that it is possible? i mean have you ever seen or driven a car in S and it shifted at a hight rpm?

All i found are videos from cars shifting in M...

on my car the shifts in D are @ higher rpm than the shifts in S and i tried everything to change it

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artec12
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« Reply #65 on: October 28, 2020, 07:41:22 AM »

Yes it will work, but you need to either patch the code, to bypass in-code clutch limit or force wrong adaptation, but then you always have too much pressure even when not needed. Both ways it works, tested many times.
Think about how pressure is calculated from ikp0/1 and this is how you can make the hack. Correct solution is something like 5120 mod for ECU, but for clutch torque.

DQ250 main pressure is 20 bar, and you hit in-code limitation far far far before that.
For someone who allegedly knows so much, you do not even know that there is no torque to pressure in VAG DSG?
It is friction coefficient -> ikp adaptation -> microslip controller.
And for microslip controller I is feedforward from torque essentially, this is why correct torque is so important to report. After that you have code limitation for clutch torque at 500nm on DQ250. No such problem on DL501 or DQ500.
Torque to pressure is a straight line between ikp0 (kiss point) and ikp1 (200nm), which you can not adjust, it is determined during adaptation - nothing to "customize" there.

prj the info you posted is invaluable, thanks a lot! I have been trying to undertand the stategy for so long. I always that that there would be a map like daten moment zu hauptdruck KL but for clutch pressures. From your post I understand that the pressure adaptation determines the kiss point or at which pressure the clutch discs start to move the car (ikp0). Then there is a fixed point at 200 nm and the line that connects those two has a fixed gradient, which if i'm not wrong should be close to 5 bar / 200nm. So one way to increase pressure would be to force a wrong adaptation, then the kiss point would be shifted at a higher pressure, and the fixed gradient would then shift the requested pressure in the whole range, like an offset, but this has obvious problems, the car would start very violently and perhaps jerk between shifts too.
« Last Edit: November 05, 2020, 08:59:47 AM by artec12 » Logged
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