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Title: BEL 4Z7907551R TVUB - trying to dial in idle fuel trims Post by: SB_GLI 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? Title: Re: BEL 4Z7907551R TVUB - trying to dial in idle fuel trims Post by: SB_GLI 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. Title: Re: BEL 4Z7907551R TVUB - trying to dial in idle fuel trims Post by: nyet on January 04, 2017, 11:34:25 AM http://nefariousmotorsports.com/forum/index.php?topic=935.msg8064#msg8064
Title: Re: BEL 4Z7907551R TVUB - trying to dial in idle fuel trims Post by: SB_GLI 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. Title: Re: BEL 4Z7907551R TVUB - trying to dial in idle fuel trims Post by: nyet on January 04, 2017, 01:12:36 PM Maybe there are multiple TVUB variant tables in that bin?
Title: Re: BEL 4Z7907551R TVUB - trying to dial in idle fuel trims Post by: AARDQ 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. |