Data log, 95% happy, still small bumps

[lswing]

Did a few runs today, log looks very good I believe. This log is after multiple hot runs, so temps are looking good, about 60 degrees out today so that helps. The ~14psi of boost feels very strong, judging by timing and egt's there is plenty of fuel (8% extra under load + full 50/50 WM spray).

My only complaint is that I still get a few "bumps", right in my peak torque range of 4-5k. In the past I would attribute those to timing being pulled, but timing is solid. There's always the chance the ecu is making small adjustments that I'm not picking up in the log. Or maybe it's a little slip in the clutch pack due to all the torque of roughly 550 at the engine. And my foot not being all the way in, you can see spots where throttle was less than 100%, but I don't think that's it.

Note, if I back off on the throttle just a touch, it's butter smooth, dunno, just searching for perfection.:revs:


<tbody>
Engine Speed
Throttle Angle
Ignition
Exhaust Gas
Exhaust Gas
Boost Pressure
Boost Pressure


(G28)

Timing Angle
Temp. Bank 1
Temp. Bank 2
(specified)
(actual)


/min
%
°BTDC
°C
°C
mbar
mbar


3240
29.8
34.5
625
620
1400
1110


3240
45.1
33
625
620
1450
1160


3280
78.4
29.3
630
620
1510
1240


3280
92.5
27
630
620
1550
1350


3360
96.5
24
630
620
1600
1440


3360
97.3
21.8
630
620
1650
1520


3440
98.8
16.5
630
620
1760
1600


3480
100
15
630
620
1770
1660


3520
100
15
630
625
1780
1720


3560
99.6
13.5
635
625
1780
1760


3600
100
7.5
635
625
1800
1790


3680
100
12
640
630
1800
1830


3680
100
9
640
630
1820
1850


3760
100
12
645
635
1830
1880


3760
100
9
645
635
1830
1890


3880
100
10.5
650
640
1850
1890


3920
100
10.5
650
640
1850
1880


3920
100
6
660
650
1860
1880


3960
99.6
6
660
650
1870
1880


4040
100
7.5
665
655
1870
1860


4080
100
12
670
660
1870
1850


4120
100
12
675
665
1880
1850


4160
100
10.5
685
670
1880
1850


4200
100
9
690
675
1880
1850


4240
100
9.8
695
685
1890
1870


4320
100
9
700
690
1900
1870


4360
100
8.3
710
695
1900
1880


4400
100
9
715
700
1910
1880


4440
100
9
725
710
1910
1870


4480
100
8.3
730
715
1910
1860


4560
100
8.3
730
715
1910
1860


4600
99.6
8.3
740
720
1900
1870


4600
100
9
740
730
1900
1850


4680
100
9.8
755
735
1900
1870


4720
100
8.3
760
740
1880
1870


4760
100
9
765
755
1860
1860


4800
100
9
775
760
1850
1860


4880
100
9.8
780
765
1830
1850


4920
100
9
785
775
1810
1830


4960
99.2
9
795
780
1800
1830


5000
100
6.8
805
785
1790
1830


5080
100
9.8
810
800
1780
1810


5120
100
9.8
820
805
1770
1810


5160
100
11.3
830
815
1760
1790


5240
100
11.3
835
820
1760
1760


5280
100
12.8
840
825
1750
1760


5320
99.6
12.8
840
830
1750
1730


5400
100
12.8
845
835
1740
1730


5480
100
12.8
855
840
1730
1720


5520
99.6
13.5
860
845
1730
1710


5560
100
15
860
850
1730
1700


5600
100
15
865
855
1730
1700


5640
100
15
870
860
1730
1690


5720
100
15
870
860
1720
1680


5760
100
18
880
865
1730
1680


5800
100
16.5
880
870
1730
1680


5840
100
15.8
885
875
1720
1700


5880
100
16.5
885
880
1720
1690


5920
99.2
16.5
890
880
1720
1700


5960
100
19.5
895
885
1720
1700


6040
100
16.5
895
890
1660
1700

</tbody>

[alrightroad]

Regarding 'bumps'... Have you tested another N75 valve? Or, perhaps your diverter valves are sticking a little?

[lswing]

Regarding 'bumps'... Have you tested another N75 valve? Or, perhaps your diverter valves are sticking a little?

Have not, have been wondering more if its something like that. The "bumps" are minor, but its that little hiccup kepping it from 100% pure...

[lswing]

Hmm, so if it's those small throttle cuts down to 99%, what would cause that?

[alrightroad]

Do you have a twitch in your right foot? :)

I just noticed the blips in the throttle angle. Wonder if that is electrical at the throttle body. Have you done an adaptation recently? That 99% could be several things.