LBZ - Rescaling MAP Sensor in EFI Live

[marrolox]

In the middle of "adjusting" an LBZ truck with a larger VGT for sled pulling. The log files show the MAP sensor is maxing out at 39.01psi (NOT including barometer pressure). I was talking to the owner and we were thinking of installing a 5 bar MAP sensor, 0-5V, adapted so it could be read through the factory harness. I have seen in other forum post (https://www.duramaxdiesels.com/forum...scaling.71271/) where .cax (or .cax8) files were added to enable rescale the MAP sensor, but none done for the LBZ. I know on the LLY's you can adjust the B0202 easily for this, but that table was remapped for altitude in the LBZ. Truck is currently running the 52604138 OS.

Any thoughts?

[svvag200]

principle is same
but unfortunately efilive does not offer a pressure sensor linearization map
and in LLY control unit dump adress different

[koolky]

OS 12632483 or 52632483

; ================================================== =============================
[B3499]
; Description
; --------------------------------------------------------------------------------------------------
DESC.001 = MAP Sensor Scaling
DESC.002 =
DESC.003 = This is used for aftermarket Manifold Absolute Pressure sensors that have a
DESC.004 = different range than the stock sensor. With the right sensor, it allows logging
DESC.005 = higher boost values than the stock sensor could handle.
; Seg Caption Major Minor Vis Dis 2d Grp
; --- -------------------------------- ---------------- ----- --- --- -- ---
VIEW = 2 "MAP Sensor Scaling" "Engine Sensors" "" 1 2 0 0
;
; Address(es) BitOff Bits Typ Inv
; -------------------------------- ------ ---- --- ---
ADDR = 1B6DEA 0 16 SNM 0
;
; Units Factor Offset Prec MinLimit MaxLimit MinUser MaxUser
; ----- ------ ------ ---- -------- -------- ------- -------
SI_SLOT = kPa 0.1 0 2 0 3276.7 0 3276.7
;
; Units Factor Offset Prec MinLimit MaxLimit MinUser MaxUser
; ----- ----------- ------ ---- -------- -------- ------- -------
IM_SLOT = PSI 0.014503768 0 2 0 475.2 0 475
;
; Body Col Row
; -------------- -------------- --------------
ULABELS = . . .
;
; Enumerations
; ---------------------------------------------------------
SI_ENUM = .
IM_ENUM = .
;
; Units Labels
; ----- ------------
SI_COL = kPa "kPa"
IM_COL = PSI "PSI"
SI_ROW = mV "156.4,5000"
IM_ROW = mV "156.4,5000"

[THAHN]

Hello, I am wondering if this is normal readout for the factory sensor scaling. It seems off to me.

[Woody35]

Hello, I am wondering if this is normal readout for the factory sensor scaling. It seems off to me.

Stock sensor should read 366 Kpa at 5000mv. Yes its wrong.

[THAHN]

Thank you. That is what I thought. I used the same CAX file as shown. Any idea how to get the correct readings?

[Woody35]

I tried it on a stock LBZ file I had and got the same numbers. The factors look good. I would suspect its a bad address. Maybe scaling for the Baro Sensor?

[THAHN]

Thank you for the help. If the address isn't correct do you happen to know the correct one? Otherwise does anybody else know what that address might be? Thanks

[Woody35]

Going to need a Bin and a “treasure map” to find the correct address. Unfortunately I do not have those.

[THAHN]

I figured it would come down to needing that. If anyone out there could lend a helping hand it would be appreciated. Thank you