timing on my T-25

[tigerstalon]

Here is my first real attempt at logging timing on my 2G. My profile has all my mods, but the relevant ones are:
2.5" turbo-back exhaust (w/ hi-flow cat)
Brode I/C pipe w/ 1G BOV
K&N FIPK
boost at 15psi
stock turbo (T-25)


__Time___RPM_Timing_O2
00:00.29 2620 34 0.72
00:00.57 2616 34 0.72
00:00.86 2608 34 0.64
00:01.13 2608 34 0.84
00:01.43 2604 34 0.54
00:01.71 2640 34 0.72
00:02.00 2708 20 0.96
00:02.27 2768 14 0.96
00:02.55 2848 9 0.96
00:02.84 2968 5 0.98
00:03.13 3056 4 0.98
00:03.42 3184 7 0.98
00:03.70 3312 7 0.98
00:03.99 3440 8 0.98
00:04.26 3572 7 0.98
00:04.55 3684 6 0.98
00:04.84 3816 7 0.98
00:05.13 3928 8 0.98
00:05.42 4056 9 0.98
00:05.69 4192 9 1.0
00:05.98 4308 10 1.0
00:06.28 4416 8 1.0
00:06.57 4504 9 1.0
00:06.84 4620 10 1.0
00:07.13 4740 9 0.98
00:07.42 4828 9 0.98
00:07.69 4960 8 0.98
00:07.98 5084 8 0.98
00:08.27 5180 9 0.98
00:08.56 5260 10 0.98
00:08.84 5360 11 0.98
00:09.11 5492 12 0.98
00:09.40 5564 12 0.98
00:09.68 5672 13 0.98
00:09.97 5748 13 0.98
00:10.27 5844 14 0.98
00:10.56 5932 15 0.98
00:10.84 6028 15 0.98
00:11.11 6112 16 0.98
00:11.40 6192 18 0.96
00:11.69 6284 18 0.98
00:11.98 6376 18 0.98
00:12.27 6452 18 0.98
00:12.56 6516 19 0.98
00:12.84 6596 19 0.96
00:13.13 6640 19 0.96
00:13.40 6736 19 0.98
00:13.69 6796 19 0.96
00:13.98 6844 19 0.96
00:14.27 6904 20 0.96
00:14.56 6968 21 0.96
00:14.84 7032 21 0.96
00:15.14 7084 21 0.96
00:15.43 7148 21 0.96
00:15.71 7216 21 0.96
00:16.00 7244 20 0.96
00:16.28 7312 20 0.96
00:16.56 6688 27 0.94
00:16.85 5988 39 0.34


Timing seems to be getting pulled in the 3500-4800 rpm range, which is basically the sweet spot for this turbo (my last dyno pull showed peak power at a little over 5000 rpm). Beyond that, I think everything looks great.

Any thoughts?

 

[kpt4321]

I agree, it looks like you are knocking in the midrange.

 

[blackGSX2g]

I thought it was normal for the ecu to pull a little bit of timing in the midrange in a 2g?

 

[CanadianTSi]

It's normal for timing to be pulled when boost hits...as yours does at about 2800 but then it should be a steady climb till redline, your timing dips at about 3600 and 4400 and again in the 4700-5000 area which is an indication that your car is seeing some knock.

 

[tigerstalon]

Yeah, I've heard of the ECU changing a/f ratio in the spool-up range (2800-3500rpm) to help smooth out the rise of boost, and I've heard of the old knock sensor LED mod to the BCS that would flash around the spool-up range also (again, presumably to smooth things out). But, I've never heard of the ECU pulling timing after the spool-up range for anything other than knock.

Anybody have any ideas on why there's knock? There's no knock at high rpms, so I don't think I'm heatsoaked. There's no boost spike, and it's only at 15psi.