Post Zeitronix Observation and question (A/F)
09-29-2006, 09:03 PM
#1
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Post Zeitronix Observation and question (A/F)
After doing some slight mods (see my signature) I had the feeling I was running a bit lean...and I was. I have since installed a WB02 and a AFPR with my Zeitronix system. Here is what I have noticed.
1. I have turned the fuel pressure to about 54-psi. Does this seem high? Per the read out, I am running between 11.10 and 12.60 @ WOT. There abouts.
2. When I completely let off the throttle, the A/F reading spikes to full lean 21.00. Normal?
3. At WOT, I noticed some smoke coming out of the exhaust. After I stopped, I went to see what was going on in the back and I noticed a spray of soot on my garage floor and driveway. It did not smell like burnt oil and it was completely dry, not moist at all.
Man, the Zeitronx tool is neat but is opening a whole box of new questions.
1. I have turned the fuel pressure to about 54-psi. Does this seem high? Per the read out, I am running between 11.10 and 12.60 @ WOT. There abouts.
2. When I completely let off the throttle, the A/F reading spikes to full lean 21.00. Normal?
3. At WOT, I noticed some smoke coming out of the exhaust. After I stopped, I went to see what was going on in the back and I noticed a spray of soot on my garage floor and driveway. It did not smell like burnt oil and it was completely dry, not moist at all.
Man, the Zeitronx tool is neat but is opening a whole box of new questions.
09-30-2006, 01:28 AM
#3
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Aren't WideBands fun 
Fuel pressure is a little high - I would rather see lower pressures and bigger injectors.
When you let off the throttle, the idle switch is tripped, and the engine cuts fuel - this causes the lean condition (no harm 'cept saving a little gas). Running rich will cause some black smoke, this is normal also.
11.1-12.6 is kinda a big spread, are you stock chipped/afm?
Rogue
Fuel pressure is a little high - I would rather see lower pressures and bigger injectors.
When you let off the throttle, the idle switch is tripped, and the engine cuts fuel - this causes the lean condition (no harm 'cept saving a little gas). Running rich will cause some black smoke, this is normal also.
11.1-12.6 is kinda a big spread, are you stock chipped/afm?
Rogue
09-30-2006, 08:34 AM
#5
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Rogue,
The spread is closer to 11.10 - 11.70 (there was a spike here and there that encouraged me to include the 12.+ numbers). As for chips and afm, I forgot to include that info in my signature. I have Weltmeister chips and a stock afm. Regarding the high pressure. Can the OEM injectors handle higher PSI's or am I tempting fate with them leaking.
I am looking into larger injectors today. Since a Vitesse MAF is in my future, I think it may be wise to upgrade the injectors too. I will talk to Chris about my options.
M, I have definately felt some improvements, i.e. the boost holding until it hits .8 bar from the Tial and it being more consistant. I have been troubleshooting a lot of vacuum leaks recently so it is tought to tell what are performance improvements and what is "how it should be running." I am also running stock boost right now until I get all vacuum leaks down and the A/F under control
The spread is closer to 11.10 - 11.70 (there was a spike here and there that encouraged me to include the 12.+ numbers). As for chips and afm, I forgot to include that info in my signature. I have Weltmeister chips and a stock afm. Regarding the high pressure. Can the OEM injectors handle higher PSI's or am I tempting fate with them leaking.
I am looking into larger injectors today. Since a Vitesse MAF is in my future, I think it may be wise to upgrade the injectors too. I will talk to Chris about my options.
M, I have definately felt some improvements, i.e. the boost holding until it hits .8 bar from the Tial and it being more consistant. I have been troubleshooting a lot of vacuum leaks recently so it is tought to tell what are performance improvements and what is "how it should be running." I am also running stock boost right now until I get all vacuum leaks down and the A/F under control
09-30-2006, 11:25 PM
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Originally Posted by chapstic951
Rogue,
The spread is closer to 11.10 - 11.70 (there was a spike here and there that encouraged me to include the 12.+ numbers). As for chips and afm, I forgot to include that info in my signature. I have Weltmeister chips and a stock afm. Regarding the high pressure. Can the OEM injectors handle higher PSI's or am I tempting fate with them leaking.
The spread is closer to 11.10 - 11.70 (there was a spike here and there that encouraged me to include the 12.+ numbers). As for chips and afm, I forgot to include that info in my signature. I have Weltmeister chips and a stock afm. Regarding the high pressure. Can the OEM injectors handle higher PSI's or am I tempting fate with them leaking.
BTW you could prob get the AFR narrowed down with a piggy-back of some sorts. No need to run richer then 11.5 (anything richer and your losing power anyway).
Rogue
