nmcqueen469

iTrader: (24)

I'm going to have a little time on a dyno this weekend to tweak my tune.

I'll be using the dyno's WB to tweak my A/F and will be working on my spark tables also. What kind of things should I log? Does anyone have a .cfg file they use on the dyno?

Just looking for a little direction as far as procedures/what to expect so I can make the most of my time on the rollers. I poked around a little on the HPT forums, but wanted to get opinions from the masters here also.

Thanks in advance.

BLK02WS6

iTrader: (2)

Personally, I never use a dyno wideband stuck in the tail pipe... I put mine in the header in place of a stock front one (unless they have an extra bung installed)... much more accurate than sticking it in the pipe - especially at idle and part throttle, but even at WOT...

As far as logging, I log commanded AFR, wideband AFR, spark, knock, MAF frequency, MAP, TPS, RPM, INJDC, coolant temp, intake air temp...

nmcqueen469

iTrader: (24)

Thanks for the reply. I have an extra bung instilled in the driver's side collector that has an LC-1 installed, but I'm not using it yet since I don't have the Pro cable. I have catted mids, so would that extra bung be the best to use?

I've read so many threads in the past week that its starting to make my head spin. I'm running SD, by the way.

white01ss

iTrader: (37)

2nd that. Also, if you have cats they produce water which can coat the o2 sensor giving false readings. To get the most out of it get an extra bung welded in front of the cats and as close to the collector as possible.

EDIT: Damn, beat me by 6 minutes...

white01ss

iTrader: (37)

Good list. I'd add MPH and Air Flow DYNCYLAIR_DMA (grams/cyl). Air flow so you can map spark and knock back to your spark map.

BLK02WS6

iTrader: (2)

I was going down my chart in my head and knew I missed a couple... yep, those are important! and for speed density, make sure you use the PID for speed density airflow...

I would put the wideband in a bung in front of the cats...

white01ss

iTrader: (37)

You did pretty damn good, I had to look at my log profile.

nmcqueen469 - It would be best to get your LC-1 working so you can have your own wideband logged with the rest of the data.

Frost

iTrader: (45)

I use the tail pipe wideband on EVERY car that I put on the dyno...




Mostly just to see what it reads as I tune off of one in a front bung

ctd

iTrader: (1)

I like both WB's as well........sanity check's.

You mentioned you are SD, is the MAF still in place? If so I would dial the MAF in while on the dyno, quick & easy if you are on a load type.

nmcqueen469

iTrader: (24)

No, my MAF is being used as a coaster in the garage.

white01ss

iTrader: (37)

Here's my standard logging pids for both the real and street dyno. I guess I don't really need the o2 sensors anymore, but haven't found anything more usefull to replace them. Maybe someone can post an HPTuners version.

Frost

iTrader: (45)

You can filter out all values greater than 0.0 in the KR histo so that nothing shows up unless it's KR. If you don't, all of the times that you DON'T knock and are in a cell, a zero is averaged in with the recorded KR value.

white01ss

iTrader: (37)

Thanks for the tip, I've made that mistake before. In this case, though, the knock map has the max value button (up arrow) selected not average so it shows the highest value in each cell. But you're right, if average is on the 0s can really distort the data unless you do like you said.