Search:

Get some new scans with the fuel trims enabled. Make sure everything is good for cruise & idle first.

The decay rate is not in milliseconds. For every 45 units in HPT the recovery rate is approximately 1 degree/second. So the low octane table with it's higher values will give you a much more...

For custom boost & vacuum PID, try these:

Boost only
This PID reports ONLY boost values. Vacuum values are discarded. (units = psi)

([SENS.30.IMP]-14.7)*([SENS.30.IMP]>14.7)

Vacuum only ...

Well, your narrowband output is flatlined. Might want to check that it's connected and that the wires are not damaged. Or if it's old, pick up a replacement.

Do you recall if you were getting any wheel slip on those WOT runs? The launch appears to start off good, but then while you're still at 100% throttle, your RPMs & speed begins to drop for a moment,...

L67 is a return type fuel systsm. L32 is returnless.

Eddie, I've read this before, but what kind of wierd things are you referring to? I have a couple of my cylinders skewed slightly based upon the results from my cylinder balance tests along with a...

Try not to change too much stuff at once when you're attempting to tune out a problem. How will you know which change worked?

I'd start with the MAF changes and the knock recovery rate. Also...

6.0L truck.

I don't think it's AE. Your TPS delta is negligable when the change in AFR occurs. Plus I've never seen an AFR drop when I hit the AE conditions in my scans.

My first though was the Cat Over...

I'll second Russ's suggestion about increasing the knock recovery rate (Knock Retard Decay vs RPM High CylAir). Your settings are presently about 2.5 deg/sec (~45 units in HPT =~ 1 deg/sec).

I...

Hmm. I missed your post before.

The mods on the car that was used to obtain the data in my pic above are : S1x cam, GenV blower w. N* throttle body, 3.2" SC pulley, 9" open cone intake, TOG...

That's what I was referring to - timing pulled as the result of detonation (KR), not the amount of knock reported. I probalby should have worded that better to make it a bit clearer.

I was actually thinking of the Knock Retard Default Value table as its called by DHP. I was under the impression that those values were the number of degrees of timing to pull when a knock event is...

Put the WOT tuning on hold for a bit. You need to first go back and get your idle/cruise trims closer to zero first. I'd suggest starting over with a stock 2002 GTP bin & a 42.5# injector table. ...

JerryH, bilemke,

Just a comment on your knock table sidebar discussion. I'm pretty sure the "Knock Fast Attack Rate" table in HPT is actually a modifier table and not the base knock table. The...

Looks like that's the right direction to take. Keep an eye on the AFR's over the next couple PE runs and see if the change is consistant.

Also, do you have a fuel pressure gauge? Monitoring your...

That is to be expected with the +7 LTFTs in PE (I've seen that happen im my logs too). I would advise against adjusting the base PE higher as a fix to this though. The next time you reset your fuel...

Commanded AFR is not ignored. Do you have a wideband O2 sensor? If so, tune the upper region of your MAF table so that commanded AFR ~ wideband AFR. Then you can adjust the base PE and PE adder...

You mean something like this?
http://www.conncgp.net/albums/HPT_pics/3800v6_FTC_map.jpg

Bill (or anyone else), try running the zero'd VE table for an extended amount of time (might want to keep the laptop handy though).

I tried something similar to what Bill did a while back after...

x2. Double check your custom histogram parameters. Looks like you based it off of one of the fuel trim / VE histograms, so compare your setup to those.

Also if you don't want the negative...

Hmmm . . . I'm not seeing anything under that tab. At least not with the GTP bins I have.

Any chance of adding a new gauge type - say a LCD readout type?

I don't think the Grand Prix guys have this parameter (I don't see it in my bins), so you'll need to physically unplug the MAF sensor.