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      08-26-2011, 07:19 PM   #38
tom @ eas
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Garage List
Gauges, Gauges Gauges....

Next up on the list are Gauges.

The M3 comes very little equipped in terms of monitoring vitals. Going to a boosted setup, three gauges come to mind:

- Air/Fuel
- Boost
- DCT Fluid Temperature

There very little space to mount gauges in the e9x chassis, we will be using the Macht Schnell Ashtray Gauge Panel for this build. Housing (3) 52mm gauges, we will always be able to keep engine vitals at a moment's glance, without being too obtrusive to the interior.

Stack is a long time respected manufacturer of data logging equipment, well known for their Data Acquisition Systems.





Components:
Macht Schnell Ashtray Gauge Panel
ST3401 Stack Wide-band Air-Fuel (Lambda)
ST3310 Stack Professional, Oil Temperature (used for DCT fluid monitoring)
ST3512 Stack Boost Pressure (-30inHg to +30 PSI)

Gauge features:

ST3401 Stack Wide-band Air-Fuel (Lambda) Features
Dual digital and radial LED displays provide accurate real-time readout of either air/fuel ratio or lambda (user-selectable). A 0-4Volt analogue output can be connected to a data-logger or to an ECU to provide real-time closed-loop feedback for improved mapping.

- User-selectable Air/Fuel or Lambda real time display
- Programmable Alarm warns of dangerous lean condition
- Peak Recall of leanest value during last run
- 0-4 Volt Data Logger or ECU output

An O2 bung was welded in for the wideband and routed to the center console in the interior.

Stack Boost Pressure Features:
- Peak Recall
- Full Dial Warning
- Pro Control High/Low Warning Set Point
- Pro Control High Over Warn Set Point
- Pro Control Low Over Warn Set Point
- Change Backlight Color
- Change Low/High Warn Color

DCT proved especially tricky for mounting the thermocouple into the fluid feed lines, however there is an upcoming solution:



Pictured is the DCT thermocouple boss from Macht Schnell, in both rapid prototype and pre-production form, we will be test fitting this soon to verify performance. Dual ports allow monitoring of fluid before or after the DCT heat exchanger.

The DCT boss mounts in sandwich block form, in between the hard and soft lines to prevent any necessary modifications to the DCT lines, making it removable at any time without trace of installation.

The second picture shows the illumination on the oil temp being a bit brighter than the boost, a resistor should take care of this and bring the lighting even across the panel.

More to come shortly.
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Last edited by tom @ eas; 08-26-2011 at 07:26 PM.
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