SVO bcs vs T-bird bcs

[BrianO]

I have all the schematics for the BCS lines routing, but was just curious if anyone knew off hand if the routing is the same with the 86 SVO and the T-bird's. The reason I ask is this.. I have the LA3 ecu like lots of you and as you know you have to add a manual boost controller. Well, I lucked out and found a T-bird bcs and am going to hook it up and see if it will work. I have my boost set at a static 10psi, but I would love it if when I flip the switch for timing advance that I got the extra 5psi as well..power on demand!! Of course my mileage will go down, but at least it will work.. haha

I assume the routing will be the same since they are the exact same motors..just wanted to clarify.

[caroth]

Yes the round BCS has the same function and same wiring, XR4Ti, t-bird, and late SVO. I use the BCS and modified A4LD code on the L series to control the boost based on VSS, TPS and load.

Chris

[BrianO]

thanks

[BrianO]

Hey Chris,

one more question since you have the same setup. The T-bird BCS like the later model SVO's has two wires going into it. The 84/85 SVO as you know has a BCM and BCS...after removing both of those I'm left with a connector with three wires.

I have upgraded to the LA3 and want to use that T-bird BCS so I can control my boost/timing from the drivers seat again.

do you know which two wires from the three wire harness will go with the T-bird bcs?

thanks in advance

[caroth]

Brian,

The boost controller based on speed write up is here:

http://rothfam.com/maf/doc-project/boostcontroller/index.html

You use pin 42 and ground to control the stock BCS to swap between high/low boost.

Chris

[BrianO]

Chris, thanks for the reply and Merry Christmas.

I have a few questions..a little confused on something so let me get it out and tell me if it's right or wrong or what.. lol

My goal is to have a functioning Octane switch controlling boost and timing just as before only with the LA3 now.

two of the wires/pins that you switch when going to an LA series ecu are 24 and 31, Octane and Boost control respectively. what exactly do these control now that they are moved to these locations on the LA?

Pin 42 shows as a kickdown solenoid for auto tranny's.. if I'm reading this right.

Is this correct to use a T-bird BCS on the svo using the stock Octane switch?
I'm wondering why it won't hook up directly into the wires going to the previous BCS..if wired correctly for the LA that is..

I'm reading your link a bit more.. looks like it automatically switches to high boost/timing when up to 35mph.. cool feature!! I'd like to control it manually on my end if possible.

[BrianO]

if my thinking is right, I should be able to hook this T-bird BCS right where my old BCS/BCM was and it shoudl work with the LA3, but I just don't know which of the three wires to use for the BCS itself.

[caroth]

If you are wanting to use the BCS function of the LA series processor, you should look at the 86 SVO wiring harness and bring your harness up to the 86 SVO specs and then check for changes with the LA series for BCS.

My speed based BCS code assumes you have disabled the stock LA series BCS code and is independent of the Octane switch. The Octane switch is a simple connection between pin 24 and 46 on the LA series, connected is premimum spark, open is regular spark.

Do some research on the LA series BCS, it takes boost away at higher mph (assuming you have a VSS hooked up) and most guys don't like the boost going away.

Chris

[BrianO]

I will, thanks!