Boost Pressure Problem (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

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:	'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

10	March	2010	21:07:57												
	1.8L R4/20VT SEA    0002														
															
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

 

[Jordan20vt]

Also I have tried using SPS to up the boost, but the higher i go the less it boosts! Currenty using HB4 setting on old SPS and Igntimig 5.

 

[Jordan20vt]

Can anybody help?

 

[tarzan]

this is mine with k03 revo stage 2 on B9T6

1.8L R4/20VT SEA    0002													
													
'003				Group B:	'020				Group C:	'115			
RPM	Mass Flow	Load	Ign. Timing		Idle Stabilization	Idle Stabilization	Idle Stabilization	Idle Stabilization		RPM	Load	Absolute Pres.	Absolute Pres.
				TIME					TIME				
 /min	 g/s	%	 °BTDC	STAMP	 CF	 CF	 CF	 CF	STAMP	 /min	%	 mbar	 mbar
1680	11.58	6.7	29.3	0.4	0	0	0	0	0.8	1800	76.7	1250	1070
1920	39	100	12	1.7	0	0	0	0	2.1	2160	124.8	2000	1530
2320	65.03	100	11.3	2.9	0	0	0	0	3.3	2680	162.4	2190	2040
2880	104.28	100	6.8	4.19	0	0	0	0	4.59	3480	191.7	2300	2460
3680	136.14	100	6	5.49	0	0	0	0	5.89	4200	191.7	2290	2330
4400	154.39	100	6.8	6.69	0	0	0	0	7.09	4800	174.4	2080	2130
5000	160.36	100	6.8	7.9	0	0	0	0	8.3	5280	160.2	1930	1990
5440	159.39	100	6.8	9.2	0	0	0	0	9.69	5800	145.1	1800	1830
5920	160.06	100	10.5	10.49	0	0	0	0	10.89	6120	136.8	1730	1740
6240	161.17	100	12.8	11.69	0	0	0	0	12.09	6440	130.1	1620	1720
6280	0	3.5	20.3	12.89	0	0	0	0	13.29	5080	72.2	1010	1330

 

[tarzan]

but i got more gs with B6T6 had peak on 1.5bar
this log

	Group A:	'002				Group B:	'115				Group C:	 Not Running	
		RPM	Load	Inj. On Time	Mass Flow		RPM	Load	Absolute Pres.	Absolute Pres.			
	TIME					TIME					TIME		
Marker	STAMP	 /min	%	 ms	 g/s	STAMP	 /min	%	 mbar	 mbar	STAMP		
	0.99	1440	27.1	4.92	13.22	0.59	1400	16.5	1020	1050			
	1.79	1560	88	11.48	29.83	1.39	1480	77.4	1640	1050			
	2.59	1800	102.3	11.07	37.86	2.19	1680	95.5	1720	1230			
	3.39	2080	126.3	13.53	55.72	2.99	1920	112	1830	1440			
	4.19	2400	151.1	16.81	74.42	3.79	2200	139.1	1960	1730			
	4.99	2800	178.9	20.5	101	4.59	2600	166.2	2070	2080			
	5.79	3320	191.7	25.42	136.97	5.39	3040	191.7	2110	2450			
	6.68	3880	191.7	25.42	147.11	6.28	3640	191.7	2120	2520			
	7.59	4400	188	25.42	157	7.08	4160	191.7	2090	2390			
	8.39	4840	177.4	24.6	162.53	7.99	4640	181.2	2000	2230			
	9.19	5120	168.4	23.78	164.17	8.79	5000	174.4	1900	2050			
	9.99	5440	157.1	22.55	161.67	9.59	5280	162.4	1860	1990			
	10.79	5720	150.4	22.14	162.03	10.39	5560	153.4	1820	1930

don`t no why i got more gs and more boost with B6T6 then B9T6

 

[Jordan20vt]

Been out in mine tonight and upped the boost and timing but acheived less boost.

The problem is it's just lost that initial spike on spool up, it's still as fast up the revs, the map just feels really smooth and progressive. I would't have a problem with it if thats how it was to start with, but it wasn't so something must be wrong.
Advancing the timing seems to have no effect and i'm runnng 99 ron, advancing the boost makes it acheive less and i have no problems with intake temps.

The logs don't really show the problem. Think it's one of those problems which could be anything and is probably something simple.

I have an N75J staring at me from across the room I'll fit that at the weekend.

 

[Jordan20vt]

but i got more gs with B6T6 had peak on 1.5bar
this log

	Group A:	'002				Group B:	'115				Group C:	 Not Running	
		RPM	Load	Inj. On Time	Mass Flow		RPM	Load	Absolute Pres.	Absolute Pres.			
	TIME					TIME					TIME		
Marker	STAMP	 /min	%	 ms	 g/s	STAMP	 /min	%	 mbar	 mbar	STAMP		
	0.99	1440	27.1	4.92	13.22	0.59	1400	16.5	1020	1050			
	1.79	1560	88	11.48	29.83	1.39	1480	77.4	1640	1050			
	2.59	1800	102.3	11.07	37.86	2.19	1680	95.5	1720	1230			
	3.39	2080	126.3	13.53	55.72	2.99	1920	112	1830	1440			
	4.19	2400	151.1	16.81	74.42	3.79	2200	139.1	1960	1730			
	4.99	2800	178.9	20.5	101	4.59	2600	166.2	2070	2080			
	5.79	3320	191.7	25.42	136.97	5.39	3040	191.7	2110	2450			
	6.68	3880	191.7	25.42	147.11	6.28	3640	191.7	2120	2520			
	7.59	4400	188	25.42	157	7.08	4160	191.7	2090	2390			
	8.39	4840	177.4	24.6	162.53	7.99	4640	181.2	2000	2230			
	9.19	5120	168.4	23.78	164.17	8.79	5000	174.4	1900	2050			
	9.99	5440	157.1	22.55	161.67	9.59	5280	162.4	1860	1990			
	10.79	5720	150.4	22.14	162.03	10.39	5560	153.4	1820	1930

don`t no why i got more gs and more boost with B6T6 then B9T6

Intrestin comparing data, looks as though yours is spiking alot higher than mine and holding bost alot longer. But yours is stage 2 I suppose, Is there anything you see wrong with my logs?

 

[tarzan]

i use a hallman boostcontroler instead off the n75.the revo stage 1 is more agressive i heard

 

[Jordan20vt]

n75 changed all fixed goes like stink spiking 23psi!!!