Boost logs and airflow help

[kineticz]

Hey all,
Was wondering if you could check out my boost logs, seems that actual is always slightly lower than requested?

	Group A:	'115				Group B:	'118			
		Engine Speed	Engine Load	Spec. Boost	Actual Boost		Engine Speed	Air Temp In	Boost Dut Cyc	Actual Boost
	TIME	700-6800 RPM	15-150%	990-1800 mbar	<=1800 mbar	TIME	700-6800 RPM	<=110 C	0-100% 	<=1800 mbar
MARKER	STAMP	 /min	%	 mbar	 mbar	STAMP	 /min	°C	%	 mbar
	3.29	2680	64.7	1670	950	3.69	2800	30	100	1160
	4.09	2960	111.3	2380	1420	4.49	3120	26	100	1680
	4.89	3320	150.4	2380	1930	5.29	3520	24	96.5	2190
	5.81	3800	181.2	2310	2290	6.2	4040	21	100	2260
	6.6	4240	178.2	2270	2200	7.01	4440	21	100	2150
	7.41	4640	176.7	2250	2090	7.8	4840	21	100	2040
	8.2	5040	169.2	2210	1970	8.61	5160	21	100	1940
	8.99	5320	165.4	2190	1890	9.4	5480	21	100	1870
	9.8	5600	159.4	2180	1830	10.2	5720	21	100	1780
	10.7	6000	131.6	990	2060	11.1	5320	21	3.1	1170
	11.5	4960	148.9	2120	1480	12	4680	23	100	2030
	12.4	4760	171.4	2190	2040	12.8	4880	23	100	2020
	13.21	4960	169.9	2180	2000	13.69	5040	23	100	1960
	14.09	5120	166.9	2170	1950	14.51	5240	24	100	1910
	15	5320	163.9	2160	1900	15.4	5360	24	100	1870
	15.79	5440	163.2	2160	1880	16.2	5520	24	100	1850
	16.6	5560	157.9	2150	1830	17.1	5360	24	0	2230
	17.5	4800	16.5	1390	1150	17.9	4520	24	100	1360
	18.3	4560	171.4	2200	2010	18.7	4600	25	100	2090
	19.1	4640	174.4	2200	2080	19.5	4720	25	100	2060
	19.9	4760	172.2	2190	2050	20.3	4800	25	100	2030
	20.7	4840	170.7	2180	2030	21.1	4880	25	100	2020
	21.48	4920	170.7	2180	2020	21.9	4960	26	100	2000
	22.28	5000	169.9	2160	1990	22.68	5040	26	100	1970
	23.08	5080	168.4	2040	1970	23.48	4760	26	0	1610
	23.88	4400	40.6	2040	1050	24.28	4160	24	100	1540
	24.68	4200	172.9	2220	2120	25.08	4200	26	100	2220
	25.48	4240	177.4	2220	2210	25.88	4280	26	100	2220
	26.39	4280	177.4	2210	2220	26.89	4320	25	100	2200
	27.29	4360	175.9	2210	2200	27.69	4360	25	100	2180
	28.09	4400	175.9	2200	2180	28.49	4400	26	100	2170
	28.89	4440	175.9	2200	2170	29.29	4480	26	100	2160
	29.69	4480	175.2	2190	2150	30.09	4520	26	100	2130
	30.49	4520	175.2	2190	2130	30.98	4560	26	100	2120
	31.39	4560	175.2	2190	2110	31.88	4600	26	100	2110

Small boost leak maybe? That log is from 3rd to 6th.

My max airflow for stage 2 is 177g/s, is this normal?


Many thanks if you can help.
Dan

 

[PhilW]

Log is all over the place, you need to log from low rpm through to red line in 3rd or preferable 4th then stop.

Looks like you have a small boost leak yeah but difficult to tell as your rpm is up and down.

Theres no log for g/s? 177 sounds about right imo.

 

[kineticz]

Yeah I did the log and that was the peak for airflow, didn't see any need for uploading the log

The first section up to 6000rpm is 3rd.

 

[kineticz]

Feels like a noob, been hunting for a low vacuum (-16 on idle) and just found out it was the DV to FPR pipe not sealed properly on the T-piece! What a div! -20 now