06 brm boost issues

[tofik0]

hey guys new here, 06 brm 145k, complete egr delete, stock exhaust, malone stage 1, new cam the works..

issue im having is car is constantly trying to build boost, start driving in 1st ever so slightly giving it gas the boost climbs to about 15-20 psi before it falls to roughly 5 and car accelerates better, same thing in every other gear.. on the highway if you give it throttle just a bit the boost climbs and holds at 15 instantly, give it more throttle and itll fall to 5 and will act normal untill you decel and get back on the gas

vacuum tested the actuator and n75 all seem to function correctly, im leaning towards stuck veins in the turbo not letting the car precisely adjust the pressure, thoughts before i blow money on a pd140 in hopes of fixing this?

 

[TurboABA]

Here's a crazy idea... log some parameters with VCDS first instead of just throwing random parts at it.

 

[tofik0]

Here's a crazy idea... log some parameters with VCDS first instead of just throwing random parts at it.

not a problem.. do tell me what parameters youd like me to log and post

 

[TurboABA]

Oh I dunno... If you suspect the turbo isn't responding, how about requested boost vs actual boost for starters?

Also, does this problem coincide with your "the works" upgrades, or was it running properly with the works before it developed?

 

[Vince Waldon]

There's a link to a great scientific step-by-step in my sig for diagnosing limp/low power, and yup when you get to the logging stage it's boost, requested vs actual.

 

[tofik0]

Oh I dunno... If you suspect the turbo isn't responding, how about requested boost vs actual boost for starters?

Also, does this problem coincide with your "the works" upgrades, or was it running properly with the works before it developed?

It’s gotten progressively worse in the last 20k, “the works” included the billet cam, new clutch , cleaning intake manifold, timing belt , injector seals injector harness , glow plug harness, all that was done shortly after I bought it and it ran no different after, turbo has been loud since day 1 and like I said has gotten progressively worse

 

[dtrvler]

I would do the requested vs actual boost and also, put a mity vac on the actuator and see where it starts moving the actuator rod and where it stops moving. Or if it even moves at all.

 

[TurboABA]

Loud turbo huh.... where are you taking your boost readings from?

 

[tofik0]

Loud turbo huh.... where are you taking your boost readings from?

when i say loud i meant its constantly spooling to the moon, heres the log, first gear slowlyy accelerating , same issue in all other gears and at all speeds,

https://log.tunezilla.com/s/OEJ61QAx - 1st gear accelerating shown below

https://log.tunezilla.com/s/pQG4ZdbS - 1st shifting to 2nd

	Group A:	'011				Group B:	'004
		Engine Speed	Boost Pressure	Boost Pressure	Charge Pressure	Engine Speed	Injection Start	Injection Duration	Torsion Value
	TIME	(G28)	(specified)	(actual)	Control Duty Cycle	TIME	(G28)	(specified)	(specified)
Marker	STAMP	/min	mbar	mbar	%	STAMP	/min	∞BTDC	∞KW	∞KW
	0.09	819	999.6	1071	80.1	0.01	819	-0.3	8.7	-0.5
	0.28	819	999.6	1071	80.1	0.19	819	-0.3	8.2	-0.5
	0.46	819	999.6	1071	80.1	0.37	819	-0.3	8.7	-0.5
	0.63	861	1101.6	1071	80.1	0.55	819	-0.3	8.2	-0.5
	0.82	882	1142.4	1071	80.1	0.73	903	3.7	9.2	-0.5
	0.98	945	1173	1081.2	80.1	0.9	903	6.5	9.2	-0.5
	1.19	1008	1142.4	1091.4	80.1	1.07	966	6.5	9.2	-0.5
	1.36	1092	1132.2	1101.6	80.1	1.27	1071	3.7	11.2	-0.5
	1.55	1197	1132.2	1132.2	80.1	1.45	1134	3.7	11.2	-0.5
	1.73	1281	1122	1162.8	78.9	1.63	1239	3.7	11.2	-0.5
	1.91	1365	1142.4	1203.6	77.3	1.82	1323	3.4	11.2	-0.5
	2.08	1449	1142.4	1244.4	75.8	2	1428	3.7	10.7	-1
	2.28	1533	1132.2	1295.4	74.6	2.2	1491	3.7	10.2	-1
	2.44	1596	1132.2	1346.4	73.4	2.36	1554	3.7	10.7	-1
	2.61	1638	1142.4	1397.4	71.8	2.53	1617	4	9.7	-1
	2.78	1701	1152.6	1448.4	71	2.7	1659	4.3	10.7	-1
	2.96	1743	1152.6	1509.6	69.4	2.87	1722	4.7	10.2	-1
	3.13	1806	1162.8	1570.8	68.6	3.04	1785	4.7	10.2	-1
	3.31	1848	1183.2	1621.8	67.5	3.23	1827	5	10.7	-1
	3.49	1890	1193.4	1683	66.7	3.4	1869	5.3	10.7	-1
	3.68	1953	1203.6	1734	65.5	3.58	1932	5.6	10.2	-1
	3.85	1995	1213.8	1785	64.7	3.76	1974	5.9	10.7	-1
	4.03	2016	1224	1836	63.9	3.94	2016	6.2	10.2	-1
	4.21	2058	1244.4	1866.6	63.5	4.11	2037	6.2	10.2	-1
	4.38	2079	1254.6	1897.2	62.7	4.29	2058	6.5	10.7	-1
	4.56	2100	1264.8	1927.8	62.3	4.47	2100	6.5	10.7	-1
	4.72	2142	1275	1958.4	61.9	4.64	2121	6.8	10.7	-1
	4.89	2163	1285.2	1989	61.2	4.8	2142	7.1	10.7	-1
	5.05	2205	1285.2	1999.2	60.8	4.97	2184	7.4	10.2	-1
	5.25	2226	1305.6	2019.6	60	5.15	2205	7.4	10.2	-1
	5.41	2247	1305.6	2040	59.6	5.33	2247	7.8	10.7	-1
	5.6	2289	1315.8	2050.2	59.2	5.51	2268	8.1	10.2	-1
	5.78	2310	1326	2060.4	58.8	5.7	2289	8.1	10.7	-1
	5.94	2331	1336.2	2080.8	58	5.86	2331	8.4	10.2	-1
	6.11	2373	1346.4	2091	57.2	6.02	2352	8.4	10.7	-1
	6.29	2415	1366.8	2111.4	56.4	6.2	2394	8.7	10.7	-1
	6.47	2436	1366.8	2131.8	56	6.38	2436	9	10.7	-1
	6.63	2478	1366.8	2152.2	55.6	6.55	2457	9.3	10.7	-1
	6.8	2499	1377	2162.4	55.2	6.72	2478	9.6	10.7	-1

 

[TurboABA]

What other codes are you throwing?

 

[tofik0]

What other codes are you throwing?

No codes thrown at the moment, once in a while I’ll get over boost code , don’t remember what the actual code number is but it throws it into limp mode, happens rarely

 

[TurboABA]

How much of what @Vince Waldon & @dtrvler have suggested have you done and\or confirmed?

 

[tofik0]

How much of what @Vince Waldon & @dtrvler have suggested have you done and\or confirmed?

I’ve used a mitt vac on the actuator , moves at 4-5 inhg , holds vacuum fine, I’ll retest the remainder of the vacuum system and report back