NefMoto

How would you disable or raise the limit for max pressure exceeded.

I've increase requested torque. However, when using a MBC and not the N75 there are times during part throttle where actual boost will be higher than requested (requested is essentially 0 and actual ~5-8 in this condition) and that DTC is thrown and car goes into limp mode. It doesn't happen often (big turbo).

I would rather raise or tune it to still have the limitation, but have it handle the part throttle on a MBC better.

Thanks,
Rey

I think you are looking for KFDLULS

Edit:  To completely disable throttle cut, FF the whole table.  In the stock mbox file, I believe it allows for a 250mbar deviation at max load before throttle cut.  I also believe the max cell value is 1275mbar allowed deviation?  I had an OTS tune that worked great with an MBC, and KFDLULS was FF'd (1275 in each cell if you are using something like tunerpro).

I plan on first tuning with the N75, and then switching over to the MBC, unless I can find a way to keep the N75 100% closed until desired boost is achieved - from what I understand it only closes to 95%, so the boost ramp up is slower.  The response is awesome with just an MBC.

yes, completely deactivation of the boost deviation will solve your problem

:)

Is that sarcasm? I ask because you usually do not advise turning safety functions off. I'd rather not disable it if at all possible.

I don't think you need to disable it... log when you are experiencing throttle cut, then bump up the corresponding values in KFDLULS.  This is assuming you aren't exceeding the limits of the map sensor.

Unfortunately my ECU does not seem to have KFDLULS.
ME7.5 06A906032KR 0261207910 366816

I see DLUL and TULV1 which should be used with KFDLULS, but no KFDLULS.

If either of you don;t mind, was are the addresses for DLUL,TULV1, and KFDLULS if your files? Maybe it's there, but I don't have it marked. (I'm looking for relative positions. I know my addresses will not match yours)

Thanks,
Rey

KFDLULS:  0x19905   (8x8)
DLUL:  (don't have a definition for)
TULV1: 0x199A0

Thank you!

That puts it around 19A22 by relative offset to TUVL1, but nothing like that near there. The closest map I have that might be used is KLDLUL. It's an 8x1 map with what seems to be target boost pressure as input and maybe allowable pressure deviation as output.


-200.0   200.0   300.0   400.0   500.0   650.0   800.0   1000.0   hPa
_______________________________________________________
1000.0   410.00   360.00   325.00   305.00   300.00   300.00   300.00   hPa

Thanks for all your help.
If I could ask for one more thing dealing with this map.... could you give me the factor/offest for the map values and both axis?

Thanks again.

After a closer look, I believe you are spot on...  It's allowable deviation by RPM and requested boost in hPa??

all are 8 bit values...

RPM (rows) 0x198F5
hPa (columns) 0x198FD

You would happen to have the offset and factor for thos axis, would you?

RPM and hPa for KFDLULS: 0x19905 (8x8) not KLDLUL (8x1)

Thanks,
Rey

Sorry, I'm such a spacebrain... my last post had the offsets but I forgot the factors...

These are for KFDLULS:

RPM (y) 0x198F5 * 40
hPa (x) 0x198FD * 10

You've been a great help. Thank you.

with your factors and 255 => 1275hPa = factor of 5, I get this:

(http://creativeion.com/rey/vw/help/KFDLULS_stock.gif)


Seems a bit more than your 250hPa allowable deviation.


With factors removed:

(http://creativeion.com/rey/vw/help/KFDLULS_stock_nofactors.gif)

factors converted to psi:
(http://creativeion.com/rey/vw/help/KFDLULS_stock_psi.gif)

Wanted to add that ELDOB the threshold for activating LDR might be of use in fixing problems like this if anyone else is having this issue.

Also another way to go about this without KFDLULS would be KFLDRX0 delta filling in overboost.  Reducing KFLDRX0 and raising your LDORXN would reduce the magnitude of the setback when you trigger overboost.  I believe setting delta filling to zeroes and raising max load during overboost to say 191 would effectively cut out the intervention completely.

in my damos i have y axis factor 40 offset 0 and x axis factor 10 offset 0 locations are for entire map 1F33F for y axis 1F32F and for x axis 1F337 try these are much closer to your file. I am posting and an original file so you can compare to find the addreses in yours.

hello
i have the problem with 17963 Charge pressure: Maximum limit exceeded code.
i tried to deactivate this but i cant find the right map.

please help

Why would you deactivate a safety feature telling you that you screwed up your tune?

because i can not run more than 1.5bar boost midrange and 1.3 in high rpm

here is ori file

1) Have your requested boost line up properly with your actual boost.
2) Don't use an MBC
3) If you have a wastegate tighter than stock, tweak the first line of KFDLULS (or KLDLUL) to match (or exceed) your wastegate pressure.

The stock values of KFDLULS (2000mBar!) should be more than sufficient, although KLDLUL (only ~500mBar) is on the edge and could use tweaking, especially if you are running tight waste gates. This applies even if running conventional N75 boost control!

that said, if you spend a lot of time WOT with a very negative lde you are doing it wrong.

here is tune

forgott to attach file

so if i now increase on this file  LDRXN from 210 to 230 the problem comes  back where the boost is cutting off to 0 Bar

Get a proper log. Not VCDS.

One more time:

If you spend a lot of time with a very negative lde you are doing it wrong.

ok i understand. but if i try to make more boost is same.

and i can not see where is KLDLUL in my file.

thanks

FORGET ABOUT KLDLUL for a moment. Make sure your actual boost tracks requested first.

For the THIRD time:

If you spend a lot of time with a very negative lde you are doing it wrong.

If you get boost figured out WOT, THEN worry about KLDLUL (when req boost is 0) and wg cracking pressure.

I know this is a very old post, but I just wanted to comment: on some files, you'll set a code, and the car will stay in limp mode until the code is cleared, so fiddling with KFLDRX0 and/or LDORXN isn't actually a great fix ;)

I've wondered this for a while now..... In the area of spool up, if you lower requested to somewhat match actual turbo spool, will you leave any power on the table?

Depends entirely on your wastegate setup, but in general, you want to set things up so you have 100% dc during spool. If your req boost is too close to actual the P and I contributions may not be big enough to result in 100% dc.

Now, if your waste gate is tight enough, that might not matter.