So i've been doing my own tuning on this new setup and i've got it worked out pretty good i'm just having a couple of issues.

First when I'm driving and I let out of the throttle the RPMs drop to almost 500 and then pick back up to 900(idle) after a few seconds. The problem being the car acts like it wants to stall out when i first let off the throttle.

Secondly. When i'm cruising and first dip into the throttle, no matter how much, theres a moment where the car jumps to a lean condition before it dips to rich even at rpms where i have immediate boost which i dont like at all.

Third how do you know when you have too much advance timing? Going by knock and injector % or is there an easier way?

Let me know how y'all are doing it.

 

Nobody?

 

I'll take a crack at it and maybe get the conversations started:

For the idle drop have you adjusted the idle set screw? See Dale Clark's PFC instructions. Also, if you have your factory ECU, you can use the FSM procedures and then install the PFC again. All of the other typical items are suspect. Does the dashpopt work? Is the deceleration fuel cut (sorry, can't think of actual name ... I'm not in front of my FC edit software) set properly in the PFC? Etc., etc., etc.

For the lean condition, research "accelerate injector" in the FC edit software. There's another setting that I can't recall at the moment ... I'll look when I'm home.

Short answer, yes, is above 40 it's too high. This is a complext question though. It's been hard for me to find timing info. Here's the best info that I've found on the forum so far. The best info that I've been able to obtain has been Chuck's tuning notes. Contact the guy (Raymond) that started the thread that I just linked to. He can set you up with access (for a fee) to a private Yahoo group that will really help you get started with the notes and then direct help by posting.

One other thing, it would help if you posted your mod info. Is the engine ported, single turbo, strait through exhaust?

 

Yes the idle screw has been adjusted and the PFC has learned the idle process. It idles fine normally, just when coming off the throttle it dips lower than it should IMO. I'll have to look into the decel info.

Will also look up Accelerate Inj. setting and go through the single turbo tuning guide i have.

I've been working on tuning the knock out by uping fuel until injectors are around 85% WOT and then backing IGN out of it until the knock goes away mostly.

Mods include: Greddy front mount intercooler, greddy intake elbow, k&n filter, Garrett GT4094R, underdrive pulleys, TurboXS RFL BOV, ALL EMISSIONS REMOVED, 3" Downpipe, 3" Greddy midpipe, St. May Dual Shotgun exhaust, Large street ported motor with Atkins super seals 2k miles on motor, JDM transmission with 57k miles, CJ Motorsports fuel rails, braided fuel lines, Injector Dynamics 725cc/1000cc injectors, Aeromotive FPR, visual aids are an Autometer boost gauge and Innovate MTX-L Wideband, Apexi PowerFC Pro computer, Magnacore wires, NGK BR10EIX plugs.

 

Hmm ... between the airpump removal (emission delete) and large street port, I'm wondering if your idle mixture is set properly. This is uncharted territory for me though. Someone else will have to chime in.

What about a lightweight flywheel? I'm wondering if you should up your idle a bit. If you are running one I would say between this and the large street port another 100RPMs may not be a bad idea. Have you noticed if the dip only happens with your fans on? There's an idle setting for the extra load that this causes. You could up the idle only when the fans are on.

 

No lightweight flywheel. Idles at 13.6-13.9 at around 900 rpms, but even when idle was at 1100 rpms it did the same. And no its not just when the fans are on. Its always. Literally i'll give the car throttle to idle it up, even if just blipping the throttle to rev up. When the rpms drop it will dip down to like 400-600 rpms for about 5-10 seconds and then pick back up to normal.

 

well the settings that I was speaking of for the tip in lean condition are:

Accelerate Injector (already posted)
INJ vs Accel TPS1

I'm out of ideas for your idle issue. Someone who has a setup closer to yours will have to chime in. My car is much closer to stock.

 

I'll play with it more this weekend. Its not too serious, just one of those ocd things

 

Do an advanced Search for threads I have started in the 3rd gen section and threads I have started in this section.

 

(1) First when I'm driving and I let out of the throttle the RPMs drop to almost 500 and then pick back up to 900(idle) after a few seconds. The problem being the car acts like it wants to stall out when i first let off the throttle.
(a) Dashpot might not be working properly. It is suppose to slowly close the throttle instead of instantly closing it.
(b) Fuel cuts not set at lease 200 rpm higher than idle speeds. I prefer using 1600-2000 rpm.
(c) Air adjusting screw not open enough, open in 1/4 turn increments until idle does not drop after checking a & b.

(2) Secondly. When i'm cruising and first dip into the throttle, no matter how much, theres a moment where the car jumps to a lean condition before it dips to rich even at rpms where i have immediate boost which i dont like at all.
(a) Could be bad injector setup in Settings 5.
(b) Could be poor acceleration setup in Settings 2.

 

arghx, What am i searching for under your name?

cewrx7r1, I'll look into the settings you mentioned.

 

I've made multiple threads about these issues. Search for titles of threads ive started here and in the 3rd gen section. Chuck's advice is spot-on and I've posted a lot about those very points he is making.

 

I'll do a search