NefMoto > Technical > Tuning > Safe water meth tuning
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Author Topic: Safe water meth tuning  (Read 24218 times)
catbed
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« Reply #30 on: August 29, 2013, 11:30:53 AM »
Quote from: nyet on August 29, 2013, 10:38:19 AM
Nope. DSLOFS. It's mentioned several times in that context on the s4wiki tuning page

If you leave it stock, req can go over the MAP limit... which does really bad things to the PID, not to mention the I-limit.

I can understand that and recall reading it in the wiki, but wouldn't setting DSLOFS to 0 affect the sensors accuracy? Gauge pressure not matching sensor pressure?

The FR shows you how to calculate the proper values for DSLOFS, so why set it to 0? Installing a 4bar sensor and doing the 5120 hack should allow you to keep closed loop PID with the proper DSLOFS?

Sorry for the hijack, just trying to understand.  Huh
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nyet
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« Reply #31 on: August 29, 2013, 11:34:31 AM »
Quote from: catbed on August 29, 2013, 11:30:53 AM
I can understand that and recall reading it in the wiki, but wouldn't setting DSLOFS to 0 affect the sensors accuracy? Gauge pressure not matching sensor pressure?

The FR shows you how to calculate the proper values for DSLOFS, so why set it to 0? Installing a 4bar sensor and doing the 5120 hack should allow you to keep closed loop PID with the proper DSLOFS?

Sorry for the hijack, just trying to understand.  Huh

It's mostly a precaution; the offset of the stock sensor is negligible, but just enough to cause problems with the PID. Zeroing it is a hack and a safeguard to make sure bad things don't happen, at the cost of a bit of accuracy.

Obviously, if you have a lot of headroom (i.e. using 5120) you should use the correct DSLOFS.
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catbed
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« Reply #32 on: August 29, 2013, 11:48:36 AM »
Quote from: nyet on August 29, 2013, 11:34:31 AM
It's mostly a precaution; the offset of the stock sensor is negligible, but just enough to cause problems with the PID. Zeroing it is a hack and a safeguard to make sure bad things don't happen, at the cost of a bit of accuracy.

Obviously, if you have a lot of headroom (i.e. using 5120) you should use the correct DSLOFS.

Got it. Thanks for that!
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julex
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« Reply #33 on: August 30, 2013, 05:42:58 AM »
I meant KFLDIMX of course  Wink
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prj
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« Reply #34 on: August 31, 2013, 04:03:45 AM »
Quote from: bk56190 on August 29, 2013, 07:53:48 AM
No rear O2 input on my 1.8T  Cry

If it's ME7 there is. Whether it is present in the harness or not.
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bk56190
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« Reply #35 on: September 09, 2013, 05:18:39 AM »
Quote from: prj on August 31, 2013, 04:03:45 AM
If it's ME7 there is. Whether it is present in the harness or not.
It seems to be complex to achieve.

Currently, I play with KFFDLBTS, here the result :

With meth :


Witout meth :


Comparative :


It seems to be safe Smiley
« Last Edit: September 09, 2013, 05:26:53 AM by bk56190 » Logged
prj
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« Reply #36 on: September 12, 2013, 06:00:05 AM »
Quote from: bk56190 on September 09, 2013, 05:18:39 AM
It seems to be complex to achieve.

Currently, I play with KFFDLBTS, here the result :
It seems to be safe Smiley

Except you are letting the engine go to -5 KR.
Whereas with the proper approach there is never any knock, because maps are switched before it starts knocking.

As for being complex - for someone who can't code, yeah. For someone who can, walk in the park.
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bk56190
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« Reply #37 on: September 12, 2013, 08:39:22 AM »
yes
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