BillD91RS

hey guys I just got a chance to borrow a laptop and log a little data. The problem is I'm having a hard time understanding all the data. Could I get some assistance please?

I'm a little worried about my knock count. Anything else stand out?

Thanks

Bill

tanager11

I dont have any idea what all that is telling you etc...but I must say getting that sort of information on all the readings from the various sensors is awsome!!!!! and something I would like to learn about too! Let me know about your progress regarding this.

Dave

BillD91RS

You should probably start by downloading the program and getting the cable made. It cost me about 5 dollars for everything

92 z28

how do you make the cable? once i figure that out ill borrow my friends laptop. what do you connect the cable to? inthe car that is? and how do you run winaldl, i have it on my comp, but it seems like a complex program. thanks. for any help.

Slade1

It's hard to read it when its not lined up with the list headings, but I can make some sense of some readings...

The first set of readings is the RAW data.

Starting at 1121 column = promid is sensor data. For 13 columns in total is the sensors.

If you look on the top row, somewhere down the line you'll find the sensor headings.

Just do the good old counting routine to figure out which column is which.

RPM is a good place to start with, 4 columns over is O2 sensor,
The 12th column from the prom id, and beside IAT (13th sensor column) is the blm sensor.

RPM pretty obvious 1500 2000 etc
02 sensor 0.xxx eg. 0.413 0.816 <0.400 = lean >0.700 = rich or something like that

Since I don't have any references on what ideal sensor readings are I can't tell you much...

From what I can read you were doing a part throttle run when you got these readings.. at speeds varying from stop to 55 mph.
Knock counts consistent 39, (anyone know if this is a good sign he's getting 39 knock counts consistently at varying speeds and rpm?)

Your blm's are consistent with your o2 readings.. blm goes up and o2 goes up, what are good blm counts vs 02 sensor reading.. An ideal blm count is 128 or within a 126-132 range. The key here being WOT runs, at part throttle blm count will pretty much tie into o2 readings with no issue provided the setup is running ok and ideal.

Edit..

Missed that part on idle.. yeah he's running way rich.. Dropping fuel pressure should help there. Aren't MAP systems pretty much all over the place when it comes to part throttle? Always constantly adjusting...

brharris27370

I cleared out the raw data and left only the sensor data and saved it into and excel spreadsheet which is easier to view. It appears that your running rich at idle (BLM's <128) and as soon as you touch the throttle it starts going lean (BLM's >128). Looks like your in need of some chip adjustment there and possibly some fuel pressure adjustment as well. What are specs and mods on this engine?

I always like 6-10 minutes worth of sensor only data. Several passes of idle to 3600 rpm at different throttle rates up to 1/2 throttle. I also like 2 or 3 WOT passes to about 5500rpm to look at the 02 voltages under PE mode.

BillD91RS

Thanks for the responce guys. Sorry about the text file I could have changed it to excel but I didn't know if everyone would be able to read it. Looks like I am running way rich. I checked the BLM and the hightest BLM I have is 132 that is only slightly lean correct? I have this next week off so I'll try to get the ultimate TBI mods done that should do two things allow a little more air in and also make it so that I can adjust the fuel pressure.

I have more data. I have a run where I went from a stop through 4th gear. BLM on that one is 128 is that because of WOT?

What is acceptable for knock?
What is INT?
TPS is throttle position sensor when off the gas I get -1.2 does that indicate that I need to adjust my throttle cable?
What is IAT?

This car is mostly stock. The engine has a open element air cleaner, 3" catback, 160 t-stat, and not related to the engine a 3.42 rear that we just put in.

BillD91RS

Read <a href="https://www.thirdgen.org/techbb2/showthread.php?s=&threadid=117913&highlight=cable">THIS</a> thread.

It should make it easy to make the cable.
Bill

brharris27370

I like to keep my BLM's less than a 130 and definitely less than 132. You small log you sent us didn't have any entries over 30% TPS. But it looked like your low throttle was running lean and as you increased throttle it started to get back to normal again. 132 isn't terrible but its a little leaner than I like. BLM is locked at 128 during PE mode (WOT). So you have to look at 02 voltage during that time. Less than .8 volts is to lean and over .9 is rich.

Acceptable knock. Engine starting knocks don't count but after engine is started. I don't like to see more than 6-10 counts on a 0-60 WOT run.

INT is integrator and it works along with the BLM.

Most people don't worry about the TPS being -1.2 infact you can adjust the WINALDL program so that it reads 0. I like to manually check my TPS sensor and get it as close to .54 volts throttle closed and 4.5 volts WOT as I can. Your car may be like mine and not open the throttle all the way. My throttle blades were not open all the way with pedal mashed into the carpet. It was visible about 95% open and 3.8-4 volts. I figure that was worth a few hp. Don't mess with the throttle cable for the - TPS reading though.

IAT is inlet air temp sensor and is or was the sensor in your air cleaner assembly. If you just disconnected it then that might be some of the rich idle problem and the 160* stat may not be help that either.

92 z28

thanks bill, ill be building one soon!

BillD91RS

Thanks for the advise brharris.
My IAT is still in the car. I zip tied it out of the way when I put the open element on. The coolant temp listed in WINAlDL is that farenheit? I have been considering putting a different t-stat in the car for a while now. The stock was 190? Do I need to go that high?

Looking at a run I made from 0~75 it looks like I am running rich. My O2 is over .9

So the 37-39 knock that I have is high? How do I go about finding that problem. The car has stock timing. Would getting a better spark clear any of that up? I have been considering getting an aftermarket coil. I replaced the cap and rotor about a month ago but pretty much everything else has been on there a while.

How do I check if my throttle is opening all the way? Do I have someone get in the car and push the pedal all the way down while I look at the blades?


Thanks for the advise
Bill