Data logging pids

[bmyles]

Hey guys , I was doing some logs yesterday but got kinda confused with what pods to use. I have my old list from when I did the initial blower install , but which ones should a guy use say for his own use. I want just the basics to ensure my car is doing what it's supposed to. Thanks

 

[mebcop]

I would say: STFT's both banks, LTFT's both banks, Measured A/F's both banks, Knock sensor, Throttle position, Actual throttle angle, MAF frequency, Timing advance, RPM, and speed.

Then if you have any issues, you can change pids for that specific issue.

 

[bmyles]

Ok thanks, so what should a guy be looking for as far a values on these pids what's good/ bad?

 

[hitmix300]

use the search feature bro. read this thread i'm linking you to.

http://www.svtperformance.com/forums/showthread.php?1021278-newbie-to-datalogging-advice

 

[bmyles]

I did search , but thanks for the link.

 

[mebcop]

You should ask your tuner what specifically to watch for a/f and timing wise. All tuners do things a little differently. One may use a touch leaner mixture with a little less timing, and another may use a touch richer with a little more timing. Both may create the same power, but you'd have to ask them what to watch for.

Heck, some tooners use a touch leaner mixture with a little more timing to make cool engine noises... lol

 

[bmyles]

Thanks , I'll get in contact with justin and see what he has to say regarding what I should be looking for.

 

[5.0jake]

Zero knock activity with negative number values at wot throughout is optimal from my understanding.

 

[mebcop]

Zero knock activity with negative number values at wot throughout is optimal from my understanding.

Ya, negative knock #'s are a good thing. Still, should ask to watch for to be safe. My car was still adding 2* of timing from 7300-up even though I was running out of injector and going lean.

 

[bmyles]

I done one last night and it said -4 on the knock sensor.

 

[mebcop]

That's a good start. Was it -4 the whole pull? Now just confirm your A/F's are in check Just look at the STFT's close to redline and make sure they aren't jumping up at the end. That's a sign that your fuel system can't keep up with what the tuner is requesting.

 

[SryOfcr]

I always log:

RPM
Knock
Spark
Spark V2
Maf lb/min
Maf Frequency
Load as a fraction
Actual Throttle Angle
Intake Air Temp
Long Term Fuel Trims
Short Term Fuel Trims
Lambse B1/B2
Measured Air Fuel