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Old 03-10-2014, 05:15 AM   #1
majunche66
Scooby Newbie
 
Member#: 106163
Join Date: Jan 2006
Location: Miami, Fl
Vehicle:
2004 sti
Blue

Default turbo intake question, could this be the cause of my problem?

i have a modded 04 sti, built block, (carrillo rods cp pistons, acl bearings, cosworth pump high flow high volume. built and ported heads, cossy avcs cams 278/274)
precision 6262 .82 A/R rotated, 1200 cc injectors dual in tank walbros. dual plate exedy clutch, short shifter, bushings, coil overs. etc etc

rotated cosworth intake mani, custom fabbed all my piping.
basically "the works"
and it is running 3 inch dp all the way out. no cats no muffler or silencer. it is a little loud but i can bare with it.
the car is in south america, so noise or speed is not big a deal here.
hydra ems for engine management.

what is curious and my question is that i fabricated a 3 inch intake for the turbo and used a 4 to 3 inch silicon adapter. i have a rotated setup, it goes from turbo to fender obviously 90 degree bend, to another 90 small straight pipe and a final 90 degree to a filter that i placed a behind the plastic cover that has the sti sticker under the headlight. on the street i run it cover on, on the track cover off, could this be the cause of my power drop after 6200-6400 rpms?

what makes it worse, is that @ 18 psi the power keeps climbing the way it should. i looks like a proper dyno graph.

i increase the boost and the car makes the same power in some places and fluctuates a lot and makes more power on the mid range but not much gain as expected 10 hps per 2 psi. and over 6200 rpms it drops hard. and if i give it timing it it drops even harder.
i revised the tune. different afrs different timing combined them. you name it, and it did not make a difference. tried cover on and off a little change on afrs but not on total power delivery. i am sure there is a choking point on the system, i know heads are not. and exhaust system could not be since it is basically a straight pipe.

running out of ideas, any help would be greatly appreciated.
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Old 03-10-2014, 05:48 AM   #2
ToneWrx02
Scooby Specialist
 
Member#: 239095
Join Date: Feb 2010
Chapter/Region: International
Location: Goteborg, Sweden
Vehicle:
2002 Wrx
Silver

Default

We need a datalog to help at all.
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Old 03-10-2014, 06:51 AM   #3
majunche66
Scooby Newbie
 
Member#: 106163
Join Date: Jan 2006
Location: Miami, Fl
Vehicle:
2004 sti
Blue

Default

here you go, all data avail. including afr boost and timing

Code:
timestamp	coolant temp (C)	AFR (:1)	engine speed (rpm)	tps (%)	boost (psi)	vehicle speed (kph)	knock ramp (V)	air temp (C)	duty cycle (%)	knock ret. (deg.)	wastegate PID (%)	cell X (n)	cell Y (n)	fuel pulse (ms)	vacuum (mmHg)	advance (deg.)
168616	93	14.6	2100	102	0.3	28	0.14	60	8.8	0	0	5	11	4.5	0	26
168704	93	13	2200	102	0.6	27	0.14	60	9.2	0	0	5	11	4.5	0	25
168792	93	12.5	2150	102	0.6	28	0.1	60	8.8	0	0	5	11	4.5	0	24
168880	93	12.5	2200	102	0.9	28	0.1	60	8.4	0	0	5	11	4.2	0	24
169000	93	12.5	2250	102	0.9	28	0.08	60	8.4	0	0	5	11	4.2	0	24
169088	93	12.9	2300	102	0.9	28	0.08	60	8.4	0	0	5	11	4.2	0	23
169176	93	13.2	2300	102	0.9	29	0.08	60	8.4	0	0	5	11	3.8	0	23
169264	93	13.7	2350	102	0.9	29	0.06	60	8.4	0	0	5	11	3.8	0	23
169352	93	14.1	2350	102	0.9	30	0.06	60	8.8	0	0	5	11	4.2	0	23
169440	93	14.6	2350	102	1.2	30	0.08	60	8.8	0	0	5	12	4.2	0	23
169528	93	14.7	2400	102	1.6	30	0.16	60	8.8	0	0	6	12	4.2	0	22
169616	93	14.7	2400	102	1.2	30	0.06	60	10	0	0	6	12	4.5	0	21
169704	93	14.7	2400	102	1.6	31	0.12	60	9.2	0	0	6	12	4.2	0	21
169792	93	14.7	2450	102	1.6	31	0.16	60	9.6	0	0	6	12	4.5	0	21
169880	93	14.7	2450	102	1.9	31	0.04	60	9.6	0	0	6	12	4.5	0	21
170000	93	14.7	2500	102	2.2	31	0.1	60	10.4	0	0	6	12	4.8	0	21
170096	93	14.7	2500	102	2.2	32	0.14	60	10.4	0	0	6	12	4.8	0	21
170192	93	14.4	2550	102	2.2	32	0.1	60	11.2	0	0	6	12	4.8	0	21
170288	94	14.2	2600	102	2.5	33	0.08	60	11.2	0	0	6	12	5.1	0	21
170384	94	13.9	2650	102	2.5	33	0.06	60	12.4	0	0	6	12	5.1	0	21
170480	93	13.7	2650	102	2.8	33	0.08	60	12.8	0	0	6	13	5.1	0	21
170576	94	13.7	2650	102	2.8	34	0.14	60	12.4	0	0	6	13	5.4	0	21
170672	93	13.4	2750	102	2.8	34	0.12	60	13.2	0	0	6	13	5.4	0	20
170768	93	13.4	2750	102	2.8	35	0.12	60	13.6	0	0	7	13	5.8	0	19
170864	94	13.2	2750	102	2.8	35	0.16	60	13.6	0	0	6	13	5.4	0	20
171000	94	12.9	2850	102	3.1	36	0.16	60	13.6	0	0	7	13	5.4	0	19
171088	94	13	2850	102	3.1	36	0.26	60	14.4	0	0	7	13	5.8	0	19
171176	94	12.9	2900	102	3.1	37	0.1	60	14.4	0	76	7	13	5.8	0	19
171264	94	12.9	2950	102	3.4	37	0.04	60	14.4	0	76	7	13	5.8	0	19
171352	94	12.7	2950	102	3.7	37	0.12	59	16	0	75.6	7	13	5.8	0	19
171440	94	12.9	3000	102	3.7	38	0.12	59	16	0	75.6	7	13	6.1	0	19
171528	94	12.7	3050	102	4.1	38	0.16	60	16	0	75.6	7	13	6.1	0	19
171616	94	12.7	3050	102	4.1	39	0.16	59	16.4	0	75.2	7	13	6.1	0	19
171704	94	12.5	3100	102	4.4	39	0.12	60	17.2	0	75.2	7	13	6.1	0	19
171792	94	12.5	3200	102	4.4	40	0.22	60	17.6	0	75.2	8	13	6.4	0	18
171880	94	12.3	3150	102	4.4	40	0.16	59	18	0	75.2	8	14	6.4	0	17
172000	94	12.2	3200	102	4.7	41	0.24	59	18	0	74.8	8	14	6.4	0	17
172088	94	12.2	3250	102	4.7	41	0.12	59	18	0	74.8	8	14	6.4	0	17
172176	94	12.5	3300	102	5	42	0.22	59	19.2	0	74	8	14	6.4	0	17
172264	94	12.5	3300	102	5.3	42	0.2	59	19.2	0	74	8	14	6.7	0	17
172352	94	12.2	3350	102	5.6	43	0.24	59	19.6	0	74	9	15	6.7	0	17
172440	94	12	3400	102	5.6	43	0.22	59	20.8	0	74	9	15	6.7	0	16
172528	94	12	3450	102	5.9	44	0.16	59	20.8	0	73.6	9	15	6.7	0	15
172616	94	12	3500	102	6.6	44	0.24	59	20.8	0	72.8	9	15	6.7	0	15
172704	94	12	3500	102	6.6	45	0.22	59	21.2	0	72.8	9	15	7	0	15
172792	94	12.2	3550	102	6.9	45	0.3	59	22	0	72.4	10	15	7	0	15
172880	94	12.2	3600	102	7.2	46	0.36	59	23.2	0	72.4	10	16	7	0	15
173000	94	12.2	3650	102	8.1	46	0.22	59	23.6	0	71.6	10	16	7.4	0	15
173088	94	12.3	3700	102	8.4	47	0.26	59	24.4	0	70.8	10	16	7.4	0	15
173176	94	12.2	3750	102	8.7	47	0.1	59	25.6	0	70.8	10	17	8	0	15
173264	94	12	3750	102	9.4	48	0.26	60	26.4	0	70	11	17	8.3	0	15
173352	94	11.8	3800	102	10	49	0.16	60	27.6	0	69.6	11	17	8.3	0	15
173440	94	11.7	3900	102	10.3	49	0.16	59	29.6	0	69.2	11	18	9	0	15
173528	94	11.5	3950	102	10.9	49	0.24	59	30.4	0	68.4	11	18	9.3	0	15
173616	94	11.3	4000	102	11.5	50	0.18	59	33.2	0	67.6	12	19	9.6	0	15
173704	94	11.3	4050	102	12.8	51	0.3	59	34.8	0	66.8	12	19	9.9	0	15
173792	94	11.3	4100	102	13.7	52	0.24	59	36	0	65.6	12	20	9.9	0	14
173880	94	11.5	4200	102	14.7	52	0.2	59	38	0	64.4	13	21	10.6	0	14
174000	94	11.5	4250	102	16.2	53	0.28	59	40.8	0	63.6	13	22	11.2	0	14
174088	94	11.8	4300	102	17.2	54	0.34	59	44.4	0	62	13	23	12.2	0	14
174176	94	11.8	4400	102	19	55	0.26	59	49.6	0	60.4	14	23	12.8	0	14
174264	95	11.5	4400	102	20	56	0.28	59	51.6	0	59.6	14	24	13.4	0	14
174352	95	11.5	4500	102	21.2	57	0.26	59	52	0	58.4	14	25	13.4	0	13
174440	94	11.3	4650	102	21.5	58	0.2	59	54.8	0	57.6	15	25	13.8	0	13
174528	95	11.5	4700	102	21.8	59	0.2	59	58	0	57.2	15	25	13.8	0	13
174616	94	11.5	4750	102	21.8	60	0.18	59	58	0	57.2	16	25	13.8	0	13
174704	95	11	4850	102	21.8	61	0.26	59	57.6	0	56.8	16	25	13.4	0	13
174792	94	10.8	4900	102	21.8	62	0.3	59	59.6	0	56.8	16	25	13.8	0	13
174880	95	10.6	4950	102	21.8	63	0.26	60	59.2	0	56.8	17	25	13.4	0	13
175000	94	10.8	5050	102	21.2	64	0.3	60	60.8	0	56.4	17	25	13.1	0	13
175088	95	10.8	5150	102	20.9	65	0.3	59	61.2	0	57.2	17	25	13.4	0	13
175176	95	11	5250	102	21.2	66	0.34	60	61.2	0	56.8	18	25	13.4	0	13
175264	95	10.8	5300	102	21.8	66	0.28	60	62.8	0	57.2	18	25	13.4	0	13
175352	95	11	5350	102	21.2	68	0.5	59	62.4	0	57.2	18	25	13.4	0	13
175440	94	11	5450	102	21.2	69	0.32	59	66.4	0	56.4	19	25	13.8	0	14
175528	95	11	5550	102	21.5	70	0.36	59	68.4	0	56	20	25	13.8	0	14
175616	95	11	5600	102	21.5	71	0.32	60	66	0	56.8	20	25	13.8	0	14
175704	95	11	5650	102	21.5	72	0.74	59	68	0	57.2	20	25	13.8	0	14
175792	94	11.1	5750	102	20.9	73	0.58	59	68.4	0	57.6	21	25	13.4	0	14
175880	95	11	5850	102	20.9	74	0.6	60	70.8	0	56.4	21	24	13.8	0	13
176000	95	11.3	5950	102	20.3	75	0.52	60	74	0	57.6	22	25	14.1	0	13
176088	95	11.1	6000	102	20.3	76	0.34	60	74.4	0	58	22	25	14.1	0	13
176176	95	11.3	6050	102	20.3	77	0.72	60	74.8	0	58	22	25	14.1	0	13
176264	95	11.1	6150	102	20.9	78	0.56	60	74	0	58	22	24	14.1	0	13
176352	95	11.1	6200	102	20.6	79	0.56	59	74.8	0	58.8	23	24	13.8	0	14
176440	94	11	6250	102	20	80	0.56	60	78	0	58.8	23	24	14.1	0	14
176528	95	11	6400	102	20	81	0.46	60	77.2	0	59.2	24	24	13.8	0	15
176616	95	11.1	6500	102	20.3	82	0.36	60	78.4	0	59.2	24	24	13.8	0	15
176704	94	11.1	6550	102	20	83	0.54	60	78.8	0	59.2	24	24	13.8	0	15
176792	95	11.1	6550	102	20	83	0.42	60	78.8	0	59.6	25	24	13.8	0	16
176880	95	11.3	6650	102	19.7	85	0.32	60	79.6	0	59.6	25	24	13.4	0	16
177000	95	11.3	6750	102	19.3	85	0.3	60	79.2	0	60.4	25	24	13.4	0	16
177088	95	11.1	6850	102	19.7	86	0.46	60	81.6	0	60	26	24	13.4	0	16
177176	95	11.3	6900	102	19.7	88	0.4	60	82	0	60	26	24	13.8	0	16
177264	95	11.3	6950	102	19.3	88	0.34	60	81.2	0	60	26	24	13.4	0	17
177352	95	11.3	7000	102	19.7	89	0.5	60	82.8	0	60	26	24	13.4	0	16
177440	94	11.3	7050	102	19.3	90	0.4	60	84	0	60	27	23	13.1	0	17
177528	94	11.3	7100	102	19.3	90	0.34	60	82.4	0	60.4	27	23	13.1	0	18
177616	95	11.3	7150	102	19	91	0.52	60	82.8	0	60.4	27	24	13.1	0	17
177704	95	11.3	7250	102	19	92	0.46	60	84	0	60	27	24	13.1	0	18
177792	95	11.3	7300	102	19.3	92	0.6	60	83.6	0	60	27	23	13.1	0	18
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