PC PRO on an 04 hotside

[stratosteve]

I just received my pcpro today (tuesday). I would like to thank UPS for giving my pro a grand tour of Pennsylvania before figuring out it was misrouted:mad: . I installed it in about 5-10 minutes and with the pnp harness was a piece of cake. I need some help in the tuning area. I used some of the previous reviews to get a start point. Currently at
grn 2
yellow 4,5 I think I might need to bump this area
red 4,5
r/b 8
y/b 8
Should I see a 12.5 afr at partial throttle (in boost) runs? It starts lean then eventually gets into the 12's as the revs build (again partial throttle). I want to make sure my part throttle is ok before I do any WOT runs. Is my thinking ok here or should I tune at WOT and not worry so much about partial throttle.

[Tom @ Fast Forward]

12.5 is ok for part throttle. Should be close to 12 at WOT. Tip in to ~3500 could be close to 13:1.

[stratosteve]

After doing some runs today, I have tweaked the settings some.
grn 2
yellow 6
red 5
r/b 8
y/b 8
I tried the r/b y/b at lower settings and it hesitated a lot at tip in (too lean).
When cruising along in lets say third or fourth gear at 2500 - 3000, I accelerate (not WOT) the afr starts @ 15 then continues to drop as the revs build. Should the afr jump to 13.x instantly or is it ok as long as it is dropping to the target?
I am going to move the boost line off of the DTB to the cruise port and see if that makes a difference.
I think my belt is slipping as I am getting a sound that i can't determine if it is ping or belt slip. I hooked up my OBD2 reader and did some runs to watch if the ECU pulls timing during the noise. Timing was in the teens through the low to mid rpms and 20 - 21 at the upper end (at WOT or very close to WOT).

[Tom @ Fast Forward]

Steve,

That almost sounds like the PC-Pro is not getting the proper boost signal. It should drop to 13 or richer almost immediately on boost. Is your boost pickup on the DTB in the area of problem noted in the other thread? Or do you have the cast DTB with the pickup in the flange? In either case, move it to the cruise nipple and let's see what happens.

[stratosteve]

WOW!! Now I know what you guys are talking about. I moved the boost line to the cruise nipple and I just had to go take another run. My afr is now steady from 3k on. Current settings
grn 8
yel 4/5
red 4/5
r/b 8
y/b 8
The only thing that still needs some work is the before 3k. I maxed out the grn and it is still lean until the yellow zone and then all is good. I like how you make an adjustment and immediately see a change in the afr.

[Tom @ Fast Forward]

What pulleys are you using? Small one on the crank? 95 or 100? Or is it a 105 or larger? Sounds like you are running the small one with 5-6 PSI boost?

See, I'm not just another pretty face. ;)

[stratosteve]

I am running 110/65. If I set the grn to 0, then I get some hesitation before 3k. At the current setting, there is no hesitation I just notice that the afr briefly jumps to @ 16 and drops pretty quick and all is good at 3k. Does the afr really matter at that low of rpm?

[Serpico]

Yesssss. ......another BRP R1 kit on a VVT motor.


And I thought I was the only one......:)

[Tom @ Fast Forward]

Serpico, sounds more like an FFS kit than BRP. ;)

Steve, the numbers sound a bit high. However, if it is running ok, I guess it is ok? Maybe it is because no e-cool? We'll have to sell you that next. ;)

[Serpico]

Those numbers are pretty close to what I ended up with when I disconnected the fifth injector as a test to see if the stock injectors could suppy enough fuel.

I think I discovered that the richest I could make it with just the main injectors was 12.5:1. But I've got a slightly bigger pulley, BTB and Walbro 255.

Sorry about the reference to BRP....it's not a 4 letter word....but close to it ;)

[BlownMX5]

Very interesting about the big difference when moving the boost line to the CC nipple. I just moved mine to the brake booster nipple when I added the e-cool but haven't done any runs yet. I'll go out and do some tuning tonight. I hope I get similar results!

My strategy for initial tuning is to set the e-cool fairly high, then just tune the main PC-Pro to get a decent a/f ratio, does that sound reasonable? My thinking is that I know my four stock injectors don't deliver enough fuel on their own (a/f goes lean at 6300+, that's why I got the e-cool), so I want to move as much fuel using the 5th injector as possible, figuring that the main injectors will take up the slack.

Pat.

[Tom @ Fast Forward]

Pat,

I would set the E-Cool to 4 or 5 and then adjust the main PC-Pro for 12:1. Don't get too carried away with the E-Cool. Despite what you read on other boards :) the E-Cool CAN get too cool and precipitate the fuel out and cause some rough running. Then, if you get some ping, add e-cool and subtract main.

Start with the normal settings :


Green 1
Yellow 1
Red 1
Yellow/Blue 4
Red/Blue 4
E-Cool Green/Blue 4

They should actually be pretty close to 12:1

[BlownMX5]

Well, I went out the other night just to be sure I didn't have any leaks and set EVERYTHING to 4 and it was still too lean, based on my Zeitronix dash monitor. So, I can only go richer from there. Tonight, I'll do actual datalogging.