hi
just wondering if any of you are familiar with HKS GCC tuning, so you could give me some pointers.

thanx.

Scharok, the only way to properly tune with the GCC is to hook up a volt meter to the o2 sensor wire by the passengers foot panel and shoot for @.85v on pump gas. Hope this helps.

thanx kon.

the only prob is that the tip of my plugs is completely white (lean), yet the 02 reading is at 0.93v.
how could i be leaning out at 0.93?

this is the way its set now:

vpc:
respnse 10
gain -10
idle 10
option/out 0

GCC:
500 rpm @ 0
2000 rpm @ 0
3500 rpm @ 4
5000 rpm @ 4
6500 rpm @ 4

i get 0.93~0.95 v approx in all gears at WOT.
i can lean it out a bit more, but i am looking at the plugs an they are telling me another story.

get yourself an EGT

------------------
Michel
My life is crap
http://www.azur.qc.ca/rallye

i do have one michel
it reads about 1450~1500 at WOT 16 psi
normally around 1300 or so combination of cruisin, boostin.

Well I would think that you're not running that lean then.

------------------
Michel
My life is crap
http://www.azur.qc.ca/rallye

Scharok, what type of plugs are you using in the car right now? Are they fairly new? Platinum or copper? What type of fuel are you using? Does it have any mixture of ethanol?

How much boost are you running and what type of fuel pump are you using(is it new?). Have you changed the fuel filter lately?

I was also thinking that you might possibly have a problem with your fuel pressure regulator. I would check and see how much fuel pressure your car has @ idle. If it's too low or if the regulator is going south you might not be getting enough fuel under boost.

Your still using the stock turbo, right? As far as the settings on your VPC/GCC goes, they don't seem to be abnormal. I can't remember the if 10 on the response is maxed out or not. If it isn't, max it to the right for best possible response(seems our cars like it that way).

kon, i am using champion plugs.. gapped at 0.32", fuel is sunoco 94 octane, 10% ethanol.
boost is at 15 approx., and using a walbro pump.
the filter was changed 2 years ago

the fpr may be faulty, i will measure it as per your suggestion, what should it read?

thanx again.

FP should read about 43psi at idle with the vacuum line disconnected and plugged up. It should read about 36 at idle with the vacuum hose connected. Then the FP should go up at least 1 psi for every pound of boost, so at 15 psi you "should" have ~58 psi



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PurplePlymouthGuy
1992 Laser AWD
DSMentia support group leader...
so many mods, I don't remember if its 20G or 20g's

i see
thanx mark.

also, it may only take one tank of bad gas to reduce a gas filter life.

But I would still trust your EGTs ( if your probe is placed before your turbo). I know that you may have differences in voltage readings between 2 cars or 2 O2 sensors, but EGTs never lie.

------------------------------------------
Michel
"Helping anyone, and I mean anyone"

If I'm not mistaken, I do believe stock fuel pressure is alittle lower than that Mark. I believe(correct me if I'm wrong) it to be @ 31psi. I don't have my shop manual handy; anyone else know exactly?

As far as your fuel filter goes, change it anyways. It's cheap and you can't lose by changing it early. Michel is correct. It doesn't take much to kill a fuel filter. At this point you're pulling straws out of a hat. You never know...

When was the last time your fuel injectors were professionally cleaned? If they're clogged, they won't supply fuel well and might cause a lean condition if dirty enough. Just another idea.

As far as trusting an EGT 100%, we can argue this one. But I'll leave it alone as it's not the main issue here.

Also, ethanol blended fuels may give the illusion that you're running lean when trying to read the plugs. Rule out everything else first before taking this into consideration though. Try using another gas product that doesn't have ethanol in it to see if it makes a difference. I don't want to say that yes it's the gas you're using when it could be something else.

[This message has been edited by Kon Pappas (edited March 27, 2000).]