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Author Topic: BEL 4Z7907551R TVUB - trying to dial in idle fuel trims  (Read 3889 times)
SB_GLI
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« on: January 04, 2017, 09:19:17 AM »

I am having an issue getting idle trims dialed in, and changes to TVUB in this bin aren't reflected in the trims as I'd expect.

Using the definition that matches the A2L for TVUB, the stock TVUB values/axis are not the same as other bins (such as the MBOX), but the values do not necessarily seem incorrect.

Has anyone else had issues with calibrating TVUB on a BEL (or 551R)?

If i set the axis/values to what they should be based on the injector data sheet, trims go wacky and fueling is ultra rich.  Ideas?
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SB_GLI
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« Reply #1 on: January 04, 2017, 09:39:26 AM »

Attached are 3 pics.

First is the original values of TVUB in 551R vs 551M.  You'll see the values are different between the bins.

Second is the DEF of TVUB in 551R

Third is the Def of TVUB in 551M

You'll notice that the factors are quite different between the bins.   Also, KRKTE factor is different between the bins.  551R is .000167 vs .000111 in 551M.
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nyet
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« Reply #2 on: January 04, 2017, 11:34:25 AM »

http://nefariousmotorsports.com/forum/index.php?topic=935.msg8064#msg8064
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
SB_GLI
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« Reply #3 on: January 04, 2017, 12:58:03 PM »

Okay thanks Nyet for the clarification on KRKTE

Either I am completely stupid, or TVUB just isn't working (at least the same) in this binary.   Using the values from the injector data sheets just doesn't work like every other ME7 binary I've modified.
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nyet
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« Reply #4 on: January 04, 2017, 01:12:36 PM »

Maybe there are multiple TVUB variant tables in that bin?
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
AARDQ
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« Reply #5 on: January 04, 2017, 02:12:08 PM »

I never had any issues with TVUB (only one AFAIK) or KRKTE with the 551R bin when going to the EV14s and 4-bar PR (for reference; don't know what you are switching to.)  With FT21s and stock exhaust my KRKTE was 0.0613.   TVUB was 2.2280    1.4920   1.0520   0.7720   0.5080
Idle trims were -1% and partial was -4%.  FKKV=1s.  Cold start improved to avoid the brief bucking by increasing KFFWL_0_A / KFFWL_1_A 10%-12% in the -30* to +9.5* range.

Later when Iadded catless 3" DPs and 2.5" all the way back KRKTE needed to be something smaller, something like 0.056.  Didn't have to change TVUB.
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