General HKS VPC & GCC

[BoostinNYC]

How to use my VPC & GCC?

 

[1LE]

What exactly do you want to know? Here's some of the basics.

"Base" tune is established by the chip in the VPC, which for best results, should match your injector size.

VPC, everything's in 2% increments, with "stock or 0" being straight up, CW = +, CCW = -:
Response knob controls how rapidly fuel is added on tip-in and subtracted on lift (Hint, 1g's typically need go positive and 2g's usually need to go negative).
Gain knob controls amount of fuel added or subtracted, this will vary based on mods.
Idle knob controls amount of fuel added or subtracted below 1500rpms, most people seem to end up subtracting a large chunk of fuel here.

GCC merely adds the ability to add/subtract fuel in 1% increments at various rpm points (value is interpolated between points).

Set idle so the car starts the best. Then, get the car pretty well tuned in just using the gain, keep the GCC set at 0. Once you've got it "pretty good" with just the gain, then make minor adjustments with the GCC. Once that's done, adjust the response so that the car runs right on tip in (you'll have to suffer with whatever the lift result ends up being).

For instance, in my case I have (JUST a for instance, these settings might blow your car up!).
Response, most of the way CCW (can't remember the exact count now). Car still stumbles a hair on tip-in, but if I subtract anymore, it detonates fuel in the exhaust on hard lifts.
Gain, +10%, gives me a good all around timing curve (smooth climb resulting in 21 degrees at 6k, 27 at 7k) with just one slight hiccup in the midrange.
Idle, full CCW during the summer, I add one click in the winter to help it start.
GCC: All ranges 0, except for a 1% add in the middle range to fix the hiccup in the timing curve. Could potentially pull 1-2% up top, but haven't had enough time to work with it.

 

[BoostinNYC]

What exactly do you want to know? Here's some of the basics.

"Base" tune is established by the chip in the VPC, which for best results, should match your injector size.

VPC, everything's in 2% increments, with "stock or 0" being straight up, CW = +, CCW = -:
Response knob controls how rapidly fuel is added on tip-in and subtracted on lift (Hint, 1g's typically need go positive and 2g's usually need to go negative).
Gain knob controls amount of fuel added or subtracted, this will vary based on mods.
Idle knob controls amount of fuel added or subtracted below 1500rpms, most people seem to end up subtracting a large chunk of fuel here.

GCC merely adds the ability to add/subtract fuel in 1% increments at various rpm points (value is interpolated between points).

Set idle so the car starts the best. Then, get the car pretty well tuned in just using the gain, keep the GCC set at 0. Once you've got it "pretty good" with just the gain, then make minor adjustments with the GCC. Once that's done, adjust the response so that the car runs right on tip in (you'll have to suffer with whatever the lift result ends up being).

For instance, in my case I have (JUST a for instance, these settings might blow your car up!).
Response, most of the way CCW (can't remember the exact count now). Car still stumbles a hair on tip-in, but if I subtract anymore, it detonates fuel in the exhaust on hard lifts.
Gain, +10%, gives me a good all around timing curve (smooth climb resulting in 21 degrees at 6k, 27 at 7k) with just one slight hiccup in the midrange.
Idle, full CCW during the summer, I add one click in the winter to help it start.
GCC: All ranges 0, except for a 1% add in the middle range to fix the hiccup in the timing curve. Could potentially pull 1-2% up top, but haven't had enough time to work with it.

thanx.