VPC OP. Out

[Boosted Supra]

What does the VPC OP. Out knob do? Can someone explain, thanks

[abustiffy]

IIRC is was an overall gain knob for an optional piece like a GCC.

[Boosted Supra]

I see, well I am having problems with my VPC. The idle keeps going for 900rpms - 1300rpms, it's never steady. It use to be steady until the shop guy messed with the response. What do you think it could be? Thanks

[drjonez]

try messing w/the response knob again.

[BillyM]

Response won't affect your idle. Op-out goes to the FCD (read edit) unit if used, not the GCC. It has it's own proprietary pigtail off the back of the VPC.

*EDIT*
...I meant to say Fcon. Silly fingers.
*/EDIT*

--billyM

[SevenMKIII]

Option out is for the PFC F-Con. Tamper with the idle knob a bit and see if it helps. http://oldschool.supracentral.com/htm/vpc.htm

-Chris

[88supraTT]

How many miles have you driven with the vpc equiped to the car? If i remeber right the vpc will learn and adjust the idle the more miles you put on it.

[BillyM]

The VPC has no way to learn anything.

People sometimes mistakenly assume the VPC is a more in-depth device than it really is. It takes rpm, a ramping voltage (map), and resistance (temp), and checks the programmed table in the rom, the outputs a frequency signal to the stock ecu mimicing KarmanVortex afm. Mind you, it can do a few other things, like response, and rpm-dependent adjustment ala GCC, but it doesn't do much else. Pretty basic stuff.

--billyM

[Boosted Supra]

How many miles have you driven with the vpc equiped to the car? If i remeber right the vpc will learn and adjust the idle the more miles you put on it.

It's been doing this since the Ron. R manifold install

[drjonez]

The VPC has no way to learn anything.

People sometimes mistakenly assume the VPC is a more in-depth device than it really is. It takes rpm, a ramping voltage (map), and resistance (temp), and checks the programmed table in the rom, the outputs a frequency signal to the stock ecu mimicing KarmanVortex afm. Mind you, it can do a few other things, like response, and rpm-dependent adjustment ala GCC, but it doesn't do much else. Pretty basic stuff.

--billyM

exactly.

[MKIIINA]

Response won't affect your idle. Op-out goes to the FCD (read edit) unit if used, not the GCC. It has it's own proprietary pigtail off the back of the VPC.

*EDIT*
...I meant to say Fcon. Silly fingers.
*/EDIT*

--billyM

not entirely correct. the opt out can also be hooked up to a GCC. thats how its hooked up in my car and runs flawlessly.

[BillyM]

If you would, please draw a quick diagram in paint as to how you've got it hooked up.

My GCC hooks directly into a proprietary plug on the back of the VPC. As far as I know, it intercepts the RPM signal and MAP voltage pre-VPC, and will not make a darn bit of difference when adjusted if put post-VPC (ie, OPT-OUT).

Thanks in advance, I'd love to learn something new about the VPC I didn't know.

--billyM