Tbi swap build thread

[rfmaster]

Originally Posted by 68 TT

I haven't messed with the stock early TBI mechanical speedo dashes that have the optical sensor on them before. All my other EFI conversions were port injected so they used different setups entirely.

How would that three wire module coming off the back of the speedo interface with the ECM? I know one wire is a ground and one is ignition on power so I'm assuming the one remaining wire goes into the ECM at A10 like the JTR module. How does this interface with the DRAC and how is it wired in?

I am no expert in DRAC interfacing - all my swaps were done using standalone inline VSS modules (non electronic dashes). DRAC - aka digital ratio adapter controller was used as a 'glue' module to get various early electronic controls working in some resemblance of a harmony. The following are good read on VSS /DRAC /ECM interfacing:

http://www.fullsizechevy.com/forums/...1-post279.html
http://www.jagsthatrun.com/V8-chapte...ed-Sensors.pdf
http://www.tbichips.com/drac/
http://www.syty.org/gallery2/main.ph...&g2_itemId=203
http://www.thirdgen.org/techboard/di...ico-trans.html


DRAC I/O
C15 2000PPM
C14 2000PPM
C13 40PPR (1:1)
C12 Signal in??? not sure
C11 2000ppm
C10 128000 PPM
C9 12V
C8 GRND
C7 VSS input
C1
C2
C3
C4 VSS cruise control

//RF