Knock?

[Zerocygnal]

What is causing this enormous amount of knock? I don't see any problems in the fuel system, and the air temperature was 45 degrees at the time of testing.

http://www.geocities.com/zerocygnal2003/Data.htm

(You can download the log in Excel format as well...)

http://www.geocities.com/zerocygnal2003/pics/SecondRun.xls
(Right-click and Save As)

15psi
14b
93Octane
Mod List: http://www.geocities.com/zerocygnal2003/Modifications.htm

(Note: The mods on the right side are next...ignore them as they have not been installed.)

 

[Zerocygnal]

If your gonna move the thread, atleast respond to it!

 

[L2RTSiAWD]

So at this point what is your fuel controller?

 

[Zerocygnal]

Stock fuel system. I'm only running 15-18psi so I haven't upgraded anything in that area yet, nor added any control units.

 

[L2RTSiAWD]

Well looking at the log it seems to be at just part throttle at sometimes.

Without any type fuel control. Your at the mercy of the ECU. That could be some phantom knock from lifters or other noises from the engine.

 

[Zerocygnal]

Hmm..I kinda wondered about that. I'm fortunate that my lifters don't tap(or atleast loud enough for you to hear it) it could be causing that problem....

I didn't drive it like I stole it when I logged it because I noticed the knock. I thought if it's doing this at light operation it's going to get heavier as I push it. Should I just log it again while running it down a 1/4 ?

I'm starting to think I've got an intermittent vacumn leak....my vac is jumping around at idle...

 

[L2RTSiAWD]

Ya log a WOT run in second@no more than 15psi.

 

[Zerocygnal]

Will do, gotta wait for the damn roads to dry. Stupid snow...

 

[Zerocygnal]

I don't have the logs up yet, I'll have to sync it when I get home. However I did a full 1/4 shifting at 6300RPM@15psi my highest count of knock was 3 so I think it's all good now. Just needed a little TLC.

 

[Zerocygnal]

OKAY, got my results back and everything is looking good.
http://www.geocities.com/zerocygnal2003/Data.htm

You can right click and download the new data file here...
http://www.geocities.com/zerocygnal2003/pics/WOTRun2.xls

What are the average values for the ISC. Also...am I maxing out my injectors? What is the highest allowable value before an upgrade is needed. I was under the impression that if your duty cycle was over 50% that you could easily starve the engine very quickly should it demand more...