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Old 02-08-2006, 12:15 PM   #1
engr
Scooby Newbie
 
Member#: 62911
Join Date: May 2004
Default boost drops off while accelerating

I've noticed that while I'm cruising on 4th (4eat), when I hit the gas to moderately accelerate at low RPMs, the boost builds up and then suddenly drops 2-3 psi.. I can feel the drop in power when the boost dips... at first, I thought it was my transmission lockup, but the rpm doesn't change... according to the logs, my primary wastgate duty cycle drops off to 0, and that's when the boost falls off.. it really makes the car feel slow when the boost falls off... My IAM is at 16..

any idea why this happens?

I'm cobb stage 2.. USDM WRX 4EAT

the last column is wastegate duty cycle% and 3rd last is boost..

Code:
Time Engine Speed (RPM) Throttle Opening Angle (%) Mass Air Flow (g/s) Ignition Timing (BTDC) Vehicle Speed (KPH) Knock Correction (BTDC) Fuel Injector #1 Duty (%) Manifold Relative Pressure (PSI) Advance Multiplier (020124) () Primary Wastegate Duty Cycle (%)
0	2328	7.84	16.8	40	98	0	5.96	-7.255	16	0
171	2303	7.84	17.08	40	98	0	6.39	-7.255	16	0
341	2313	7.84	16.74	40	97	0	5.92	-7.255	16	0
511	2309	7.84	16.53	40	97	0	5.91	-7.255	16	0
681	2322	8.24	16.94	40	97	0	6.44	-7.11	16	0
852	2318	8.24	16.53	40	96	0	6.43	-7.11	16	0
1022	2305	8.24	17.15	40	96	0	6.39	-7.11	16	0
1192	2313	8.24	17.01	40	96	0	6.41	-7.11	16	0
1362	2315	14.51	24.32	40	96	0	7.9	-6.094	16	6.27
1533	2305	15.69	32.27	36	96	0	10.32	-2.902	16	12.55
1703	2323	15.69	32.84	35	96	0	10.9	-2.031	16	21.96
1873	2308	16.08	34.32	34	96	0	11.32	-1.741	16	24.71
2043	2333	17.65	37.15	33	96	4	11.95	-0.871	16	33.73
2214	2337	18.43	38.56	32	97	7	13.46	-0.29	16	40.78
2384	2323	18.82	40.7	31	97	7	14.37	0.29	16	42.75
2554	2349	19.22	42.23	30	97	8	15.03	0.871	16	44.71
2724	2344	19.22	43.47	29	97	8	15.5	1.161	16	45.88
2895	2371	20	46.04	27	97	8	16.69	1.741	16	49.8
3065	2358	20.39	47.87	25	97	8	17.11	2.176	16	52.94
3235	2382	20.78	49.7	23	98	8	18.3	2.757	16	53.73
3405	2376	20.78	53.49	21	98	8	18.24	3.337	16	55.69
3576	2401	20.78	52.16	21	98	8	18.95	3.627	16	55.69
3746	2409	21.18	53.59	19	98	7	19.53	4.063	16	57.25
3916	2402	21.96	55.58	19	98	7	19.98	4.498	16	58.04
4086	2426	22.35	57.23	18	98	7	20.7	5.078	16	58.82
4257	2419	22.75	59.05	17	100	7	21.15	5.804	16	59.22
4427	2438	23.14	60.9	17	100	7	21.84	6.094	16	59.22
4597	2453	23.14	64.28	17	101	8	22.5	6.675	16	52.55
4767	2466	23.53	65	17	101	8	23.15	6.965	16	41.18
4938	2479	23.53	66.78	17	101	8	23.8	7.4	16	31.76
5108	2479	23.53	65.71	17	102	8	23.27	7.4	16	17.25
5278	2498	23.92	62.68	18	102	8	22.38	7.11	16	7.06
5448	2529	23.92	55.74	19	102	7	19.42	5.514	16	0 <------------ Boost drops here.
5619	2510	23.92	57.4	19	103	7	19.27	5.078	16	0
5789	2522	23.92	58.72	18	103	7	19.9	4.933	16	0
5959	2551	23.92	58.55	18	103	7	20.13	4.933	16	0
6129	2534	23.92	60.22	18	104	7	20.54	4.933	16	0
6299	2560	23.92	59.54	18	104	7	20.2	4.933	16	0
6470	2547	23.92	59.54	18	105	7	20.11	4.933	16	0
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