Boost Problems (with logs)

[Jordan20vt]

Hi all,

Recently I have noticed my boost is only reaching 14 psi and then tailing off a couple of psi. Previously it would spike to around 21-22 and hold around 15psi. (boost guage)

There is no obvious boost leaks or split vac lines, and i have recently serviced th DV. Also there is an occasional bank 1 Lamda fault, but i've had the fault for years with no adverse effect on performance.

Car is running:
Modded airbox with GC filter
Laguna FMIC
Milltek Cat back
Revo Stage one

Running HB4 and Timng 5, if i turn the boost up it produces less.

I've been out logging tonight,but don't really know how to read the data. Can someone have a look for me please Thankyou

Group A:	'002				Group B:	'115				Group C:	'118			
	RPM	Load	Inj. On Time	Mass Flow		RPM	Load	Absolute Pres.	Absolute Pres.		RPM	Temperature	Load	Absolute Pres.
TIME					TIME					TIME				
STAMP	 /min	%	 ms	 g/s	STAMP	 /min	%	 mbar	 mbar	STAMP	 /min	°C	%	 mbar
10.89	1080	67.7	9.02	15.75	10	1480	12.8	1000	1040	10.49	1480	18	0	1050
12.3	1320	74.4	12.3	23.5	11.39	1160	56.4	1000	1070	11.9	1240	18	0	1060
13.59	1600	99.2	12.71	32.92	12.7	1400	87.2	1540	1110	13.19	1520	15	99.2	1200
14.89	2040	127.8	15.58	52.44	14.07	1760	106	1760	1340	14.49	1920	15	99.2	1430
16.09	2520	165.4	20.09	86.58	15.29	2160	139.1	1890	1670	15.69	2360	14	99.2	1810
17.29	3080	175.2	22.14	101.19	16.49	2720	181.2	2000	2200	16.89	2880	15	77.3	2230
18.49	3600	168.4	22.14	116.75	17.69	3240	170.7	1980	2090	18.09	3440	15	74.9	2060
19.79	4120	168.4	23.37	133.08	18.89	3760	168.4	1970	2010	19.29	3920	15	75.3	1990
21.08	4600	163.9	23.78	142.31	20.18	4280	164.7	1940	1980	20.58	4400	17	76.1	1950
22.39	5000	164.7	24.19	157.14	21.48	4720	163.9	1880	1910	21.99	4880	18	78	1880
23.58	5360	156.4	22.96	158.97	22.79	5120	163.2	1820	1850	23.19	5240	19	78.4	1860
24.78	5680	146.6	22.14	158.22	23.99	5440	151.9	1790	1820	24.38	5560	20	77.6	1780
26.09	6000	142.9	22.55	162.89	25.19	5760	146.6	1750	1750	25.59	5880	21	80	1730
27.5	6360	136.8	22.14	164.89	26.49	6120	142.1	1660	1690	27	6200	21	80.4	1670
28.79	6640	130.8	21.32	165.75	27.98	6440	135.3	1600	1650	28.39	6520	23	78.4	1650
29.99	6880	125.6	20.5	163.19	29.19	6720	128.6	1590	1620	29.59	6800	23	76.9	1630
31.18	7040	46.6	4.92	49.47	30.39	6960	123.3	1600	1590	30.79	7040	24	66.3	1580

Group A:	'002				Group B:	'020				Group C:	'114			
	RPM	Load	Inj. On Time	Mass Flow		Idle Stabilization	Idle Stabilization	Idle Stabilization	Idle Stabilization		Load	Load	Load	Load
TIME					TIME					TIME				
STAMP	 /min	%	 ms	 g/s	STAMP	 CF	 CF	 CF	 CF	STAMP	%	%	%	%
12.78	1440	85	10.66	23.5	13.18	0	0	0	0	12.38	118.8	117.9	80.5	1.2
14.07	1720	106.8	13.53	37.5	14.47	0	0	0	0	13.58	130.8	129.9	100.8	99.2
15.27	2120	136.8	17.22	59.25	15.67	0	0	0	0	14.87	145.1	144.8	124.8	99.2
16.47	2600	179.7	22.14	96.53	16.87	0	0	0	0	16.07	156.4	156.7	160.9	83.5
17.77	3200	172.9	22.14	108.58	18.17	0	0	0	0	17.37	163.9	162.7	175.9	76.5
19.08	3800	169.9	22.96	126.81	19.48	0	0	0	0	18.68	164.7	164.2	168.4	74.9
20.26	4240	165.4	23.37	130.94	20.66	0	0	0	0	19.86	163.9	162.7	168.4	75.7
21.46	4680	166.2	24.19	148.72	21.88	0	0	0	0	21.06	161.7	161.2	165.4	76.5
22.66	5040	164.7	24.19	159.67	23.08	0	0	0	0	22.26	157.9	158.2	165.4	78.4
24.07	5360	156.4	23.37	160.69	24.47	0	0	0	0	23.58	153.4	152.2	158.6	77.6
25.38	5640	148.9	22.55	160.36	25.77	0	0	0	0	24.97	148.9	147.8	148.9	76.9
26.68	5840	145.1	22.55	162.03	27.08	0	0	0	0	26.18	144.4	144.8	148.1	78.8
27.88	6080	141.4	22.55	160.36	28.28	0	0	0	0	27.46	138.3	137.3	142.9	80
29.08	6240	138.3	22.14	163.19	29.48	0	0	0	0	28.68	135.3	135.8	139.8	80
30.37	6480	133.8	21.73	164.33	30.77	0	0	0	0	29.88	132.3	131.3	136.1	80
31.57	6680	128.6	20.5	164.03	31.97	0	0	0	0	31.17	130.8	129.9	130.8	76.9
32.77	6920	124.8	20.09	165.47	33.17	0	0	0	0	32.36	130.8	129.9	126.3	75.3

[wild willy]

No boost leak there mate as your car is producing what the map is requesting.
Ask for more boost and see what you get, the n75 valve duty says theres more to be had.

[Jordan20vt]

mmmmm I'll try and turn it up and log it again. Do you think the boost guage could be broken? as it doesn't show a spike, just goes to 15 and stays there before tailing as normal?

Also do you think the MAF readings are a little high?

Thanks