In what order do I wire a VPC, EVC, SAFC2 and Zeitronics wideband?

[MarkIII4Me]

I currently have a safc2 hardwired in (car has not ran yet). However, now I need to add a VPC (have pnp harness), EVC1, and Zeitronics wideband. What gets wired before what?

Do I have to pull the safc2 wiring, repair the factory harness and wire the the safc2 into the VPC pnp harness?

 

[MarkIII4Me]

Seriously? Nobody?

 

[mkIIIman089]

It's a straight forward install if you understand what they each do, just think about it for 5 seconds and you should be able to work it out. That's probably why no one has answered.

 

[MarkIII4Me]

It's a straight forward install if you understand what they each do, just think about it for 5 seconds and you should be able to work it out.

I would think that I would have to have the SAFC wired in after the VPC. I know in the SAFC install doc it states that if your using a FCD, then it needs wired in before the SAFC. Now I know the VPC isn't an FCD, but it does remove FC. Now the Zeitronix can just be wired into the SAFC2 harness since they use many of the same wires anyways. The main thing I need to know is if I should pull the SAFC2, repair the factory harness and wire the SAFC2 into the VPC jumper harness.

I was able to source a brand new unopened 89-92 VPC harness. Probably the last one there is. I'd hate to hack it all to pieces unless it's absolutely necessary

 

[blk92suprat]

The VPC has the yellow wire that generates the air flow signal. The SAFC has an input and output wire. Connect the yellow output of the VPC to the input of the SAFC. Then connect the output of the SAFC to the fields harness wire that was originally the maf wire.

So you are taking the VPC signal, running it through the SAFC, then it goes on to the ECU.

Wideband and boost controller are totally seperate in this install. Hope this helps.

 

[MarkIII4Me]

The VPC has the yellow wire that generates the air flow signal. The SAFC has an input and output wire. Connect the yellow output of the VPC to the input of the SAFC. Then connect the output of the SAFC to the fields harness wire that was originally the maf wire.

Makes sense.

Thanks for that

 

[blk92suprat]

ok so we covered how to wire the vpc>safc>ecu
but just to clarify because I am a little fuzzy on this..

ok so we know the vpc uses pressure, not karmen for metering the air flow. Since the vpc removes the the afm but is tricking the ecu to still read karmen, which color wires on the safc 2 do we use to attach to the airflow signal on the ecu harness.

Do we use the Airflow Signal Wires (pink and orange) or the Airflow/Pressure Signal Wires (yellow and white) on the safc 2 harness while using a VPC?

I know for install with the afm, we would use the airflow signal (pink and orange). Is this the same for using a VPC or do we use the Pressure signal wires (yellow and white).

 

[blk92suprat]

^
I'm almost positive the orange and pink wires are still used with the
safc2/vpc combo install.

Can anyone confirm this?

 

[Turbo Habanero]

Wouldn't it be easier to buy a AEM EMS Stand alone :icon_bigg Just reading this makes me feel the plans i have i am in way over my head :aigo:

i guess i will learn one way or another.

 

[gofastgeorge]

If using the S-AFC in-line, after the VPC, keep it wired as Karmen, since the VPC signal goint to the ECU is a Karmen signal.
Or you can wire the S-AFC into the VPC pressure sensor,
instructions on how to do that are on the APEX site.
Then the S-AFC would be set to Pressure,but that info is all on the S-AFC documentation at APEX.

By the way, the VPC was designed by the same guy who later started APEX,
back when he worked for HKS.

 

[MarkIII4Me]

If using the S-AFC in-line, after the VPC, keep it wired as Karmen, since the VPC signal goint to the ECU is a Karmen signal.
Or you can wire the S-AFC into the VPC pressure sensor,
instructions on how to do that are on the APEX site.
Then the S-AFC would be set to Pressure,but that info is all on the S-AFC documentation at APEX.

Is there any benefit to wiring the SAFC directly to the Pressure Sensor over running it Karman?

 

[mkIIIman089]

I've heard speculation that the SAFC produces a "cleaner" output than the antiquated VPC does, so it's preferred to run the VPC output through the SAFC before the TCCS.

 

[Turbo Habanero]

TCCS stands for Toyota Computer Controlled System Correct ? :1zhelp:

 

[mkIIIman089]

http://cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=4

 

[MarkIII4Me]

The VPC has the yellow wire that generates the air flow signal. The SAFC has an input and output wire. Connect the yellow output of the VPC to the input of the SAFC. Then connect the output of the SAFC to the fields harness wire that was originally the maf wire.

So you are taking the VPC signal, running it through the SAFC, then it goes on to the ECU.

That did the trick.

And for anyone who references this thread, the VPC airflow output wire is grey on the PnP harness. The SAFC2's input wire is orange and output is pink. For everyone without the VPC main PnP harness, the TCCS MAF wire is green/red and is wire KS on the factory harness.