Anyone familar with HKS VPC setup

[JesseH]

Hoping to get a few tips from someone who has ran/or is using this setup.


I recently took out my maft basic setup to go to speed density with the VPC, everything is installed and wire up. My IAT sensor is located right underneath my throttle body (FFIM), and my MAP sensor is pulled right off the manifold.

The problem I am having is at WOT I cant get my A/F's to come anywhere above 10.5:1 and have pulled as much fuel as I can. And then at crusing its the opposite, the A/F's sit pretty lean around 16.5:1 and 17:1.

My fuel pressure is set to 40psi without vacuum.


thanks

 

[iceberg319]

what injectors are you running? try lowering the base fp a bit more

 

[martin p]

is the ait before the throttle body? i.e in the 3000 pipe?

 

[BKCressida1718]

where did u manage to get a vpc from?

 

[JesseH]

what injectors are you running? try lowering the base fp a bit more

They are stock 440's, I've tried lowering the base pressure far as I feel safe with. and I still sit in the 10's

 

[JesseH]

is the ait before the throttle body? i.e in the 3000 pipe?

I dont have a 3000 pipe, I run FFIM and a Q45 throttle body

where did u manage to get a vpc from?

From a local here, its been boxed up for a bit.... he went standalone awhile ago once he got above the 500whp mark.

 

[martin p]

so is the sensor before the throttle body?

 

[JesseH]

so is the sensor before the throttle body?

yes, about 3" before the throttle body.

 

[dbsupra90]

are you running the 440cc chip?

do you have an afc or anything?

 

[JesseH]

are you running the 440cc chip?

do you have an afc or anything?

I do not have an afc installed right now, and I am running the 440 chip. But as of right now none of the dials are effecting the A/F's.

 

[suprashy]

I don;'t know if this would help, but I thought I'd mention it - could your timing be off?

 

[dbsupra90]

if you crank the knobs all the way up does it get richer? not sure how rich your sensor reads. did it run rich with the maft?

also, an afc works wonders hooked up to the vpc.

hi shyler!

 

[JesseH]

Even when I crank the gain knob all the way up it does nothing.

 

[suprashy]

Wassup Kentucky Dave!!

Do u think the OP timing is set correctly? I ask this bec. he's very rich, and if I remember correctly, if you pull too much fuel out (like I did on my SAFC) to try to get a better a/f, then the computer will retard the timing. For starters, don't u think he should make sure his timing is correct (or am I way off here)?

 

[JesseH]

Wassup Kentucky Dave!!

Do u think the OP timing is set correctly? I ask this bec. he's very rich, and if I remember correctly, if you pull too much fuel out (like I did on my SAFC) to try to get a better a/f, then the computer will retard the timing. For starters, don't u think he should make sure his timing is correct (or am I way off here)?

My timing is dead on, Like I said I can't pull fuel out because the knobs are not doing anything, Im going to try a few different chips today.

 

[iceberg319]

have you tried testing the MAP sensor?

did you buy a plug and play harness or did u hardwire it?

 

[dbsupra90]

i'm gonna say the map sensor is ok or it would run like ass. how do you have it hooked up at the ecu? specifically, the air flow signal. have you checked codes? did you add the resistor in?

 

[JesseH]

Ok, I believe I'm good to go now... a friend wrote me a new eprom chip for 440's and everything seems to be running great now.



thanks for the responses.