[OM3G@]

Can someone smarter than me take a look at my cobb datalog and see if anything is wonky? I've been to the drag strip exactly once and was severely dissapointed. I had Cobb's stage 1 aggressive and was running identical times to what the magazines were getting for a stocker (13.5@106). I'm near sea level and the temp was probably 75F, DSC and DTC both off, manual trans. Tires: Hankook ventus V12 evo F235/35 R265/30. Last summer (after the track event) I had a grand total of one misfire (cyl 6) when going WOT in 3rd when merging onto the highway. It went away on its own after a couple minutes of cruising at 55mph. This winter I started getting them at cold startup (always cyl 6). At this point had 60K miles on the car and new it was overdue for a valve cleaning (plugs were replaced at 50K). So I got the valves cleaned via walnut shell blasting and the car seems to run better, but it could just be wishful thinking. That's why I recorded this log. This run is WOT from 2nd@1500RPM to the top of 3rd. A couple questions:

1. Should TPS act be that much lower that accel pedal pos? I've seen other people's logs that show TPS at 99%
2. Should the timing vary between cylinders as much as mine are in the 3rd gear portion?

Link to the log: http://www.datazap.me/u/netwerker/2-...g=0&data=2-4-5

[JStang]

You are getting a throttle closure at 3915 RPM's likely due to a slight over boost. Do another log in third gear from 2500 RPM's to 4th gear and log timing corrections cylinder 1-6.

TPS at 81% is normal.

[OM3G@]

Originally Posted by JStang

You are getting a throttle closure at 3915 RPM's likely due to a slight over boost. Do another log in third gear from 2500 RPM's to 4th gear and log timing corrections cylinder 1-6.

TPS at 81% is normal.

I'll have to grab that and upload tomorrow, thanks

[Allen@MOTIV]

At WOT TPS ideally should be 80%. Typically a drop in TPS is related to either traction control intervention or load/boost overshooting target. A drop to 75% isn't terrible and you probably can't feel it. However, with this being a 2nd-3rd gear log the car isn't loaded up properly.

Timing isn't terrible but it would be nice to see if those corrections are typical or a rare occurrence. Try getting a couple 3rd gear logs and reset to the default logging list and it will be a lot of help.

[135Pats]

Start in 3rd to give it sufficient load, a 2nd gear log is tough to draw much from.

[OM3G@]

Originally Posted by Allen@PTF

At WOT TPS ideally should be 80%. Typically a drop in TPS is related to either traction control intervention or load/boost overshooting target. A drop to 75% isn't terrible and you probably can't feel it. However, with this being a 2nd-3rd gear log the car isn't loaded up properly.

Timing isn't terrible but it would be nice to see if those corrections are typical or a rare occurrence. Try getting a couple 3rd gear logs and reset to the default logging list and it will be a lot of help.

done
http://www.datazap.me/u/netwerker/3r...=0&data=1-4-20

[Allen@MOTIV]

Originally Posted by OM3G@

done
http://www.datazap.me/u/netwerker/3r...=0&data=1-4-20

Not too bad. Boost control is better and timing corrections are limited to spool up or immediately post shift and then recover. Post shift corrections are usually not a huge concern because they can be attributed to noise or even turbulence in the combustion chamber due to throttle plate closure.

[OM3G@]

Originally Posted by Allen@PTF

Not too bad. Boost control is better and timing corrections are limited to spool up or immediately post shift and then recover. Post shift corrections are usually not a huge concern because they can be attributed to noise or even turbulence in the combustion chamber due to throttle plate closure.

Great, thanks for the assessment!