Overboost logging

[pekingprawn]

Was out logging my k04-023 golf gti at lunchtime to find out if i still had an overboosting problem.

Tested with the n75 unplugged electrically and car was making 7psi which shows me the actuator and wastegate seems fine..

N75 plugged back in, car was requesting and making 1.3 bar which seems very healthy, although it didnt seem to be boosting like it should...

So, i did a fault scan and found the following....

14 Faults Found:

17526 - Oxygen (Lambda) Sensor Heating; B1 S2: Open Circuit
P1118 - 35-00 - -
17522 - Oxygen (Lambda) Sensor; B1 S2: Internal Resistance too High
P1114 - 35-00 - -
17978 - Engine Start Blocked by Immobilizer
P1570 - 35-10 - - - Intermittent
17633 - Fuel Injector for Cylinder 1 (N30): Short to Ground
P1225 - 35-10 - - - Intermittent
17635 - Fuel Injector for Cylinder 3 (N32): Short to Ground
P1227 - 35-10 - - - Intermittent
17636 - Fuel Injector for Cylinder 4 (N33): Short to Ground
P1228 - 35-10 - - - Intermittent
17634 - Fuel Injector for Cylinder 2 (N31): Short to Ground
P1226 - 35-10 - - - Intermittent
17833 - EVAP Purge Valve (N80): Short to Ground
P1425 - 35-10 - - - Intermittent
17956 - Boost Pressure Regulation Valve (N75): Open Circuit
P1548 - 35-10 - - - Intermittent
17843 - Secondary Air Pump Relay (J299): Short to Ground
P1435 - 35-10 - - - Intermittent
17938 - Camshaft Timing Adjustment: Short to Ground
P1530 - 35-10 - - - Intermittent
17829 - Secondary Air Injection Solenoid Valve (N112): Short to Ground
P1421 - 35-10 - - - Intermittent
17697 - Boost Pressure Control Valve (N249): Short to Ground
P1289 - 35-10 - - - Intermittent
17535 - Fuel Trim; Bank 1 (Mult): System too Rich
P1127 - 35-10 - - - Intermittent

Any thoughts? Intake temperatures were steady at 31 degrees too, not sure if this is good or bad?

TIA

 

[pekingprawn]

also i meant to say, i've done the n249 and n112 bypass and when i was doing the logging runs i could hear MUCH more air being pushed (possible boost leak) out the drivers side window. i thought this was dodgy, since the car might be making much more than 1.3 bar but only reading as 1.3 due to a leak? but then again, if the actuator is making 7 psi, what other way is there for the car to overboost?

 

[Big_daddy]

clear the faults, then log the boost/maf/fueling

 

[pekingprawn]

Cant do that im afraid... and i dont want to run the car while ive got short to grounds on the injectors - bit dangerous

I've been told fuel pump relay may be the source of the short to ground faults?

So far i've worked out that my:

lambda faults are fine since im running a decat with no post cat sensor

immobilizer fault is a bit of a mystery

Boost Pressure Regulation Valve (N75): Open Circuit and Fuel Trim; Bank 1 (Mult): System too Rich is from when i disconnected and logged without the n75 connected

17938 - Camshaft Timing Adjustment: Short to Ground may or may not be down to the fuel pump relay

What are the dangers of the camshaft timing adjustment sensor being off?

 

[james walker]

cant clear the faults??? why not?


all are short to ground faults, that could be caused when you logged with no n75 on... id clear the faults and relog


also posting your logs would help aswell mate

 

[pekingprawn]

yeh, i dont have the cable / vagcom and the guy who does isnt going to be around for a few days.

I'll try and get a cable and hard copy of the logs tomorrow and see where im at.

Thing is, i had a headlight go out and my wipers went really slowly last night so i have a funny feeling theres an electrical fault somewhere!

 

[james walker]

you will need to post the logs to so we can see any issues with them really...

 

[pekingprawn]

Managed to clear the fault codes, and the only ones that come back are the two rear lambda probe faults, which is fine.

Anyway, i got a chance to do a quick log, couldnt redline it as the road wasnt long enough and it was soaking wet but i got this...

	Group A:	'002				Group B:	'115				Group C:	'118			
		Engine Speed	Engine Load	Injection Timing	Mass Air Flow		Engine Speed	Engine Load	Boost Pressure	Boost Pressure		Engine Speed	Intake Air	Wastegate (N75)	Boost Pressure
	TIME	(G28)			(G70)	TIME	(G28)		(specified)	(actual)	TIME	(G28)	Temperature (G42)	Duty Cycle	(actual)
Marker	STAMP	 /min	 %	 ms	 g/s	STAMP	 /min	 %	 mbar	 mbar	STAMP	 /min	°C	 %	 mbar
	0.29	1000	64.7	6.46	13.03	0.59	1120	65.4	1020	1010	0.89	1200	33	0.8	1020
	1.19	1280	69.9	6.46	18	1.5	1400	70.7	1050	1060	1.8	1520	31	0	1070
	2.1	1600	72.2	6.46	22.75	2.4	1720	72.2	1090	1100	2.7	1840	29	83.1	1120
	3.01	2000	83.5	7.82	33.94	3.31	2120	89.5	1520	1210	3.61	2280	26	89.4	1280
	3.91	2440	104.5	9.52	52.67	4.21	2480	40.6	1000	1370	4.52	2240	24	0	1180
	4.82	1600	66.2	11.56	44.75	5.12	1720	79.7	1700	1110	5.42	1840	24	100	1140
	5.71	1880	85.7	7.82	32.53	6.02	1960	88.7	2080	1210	6.33	2000	23	100	1260
	6.63	2080	96.2	9.86	40.14	6.93	2160	99.2	2310	1350	7.23	2240	23	100	1400
	7.53	2320	108.3	11.22	49.64	7.83	2400	115	2370	1520	8.14	2520	22	100	1620
	8.44	2600	131.6	13.94	68.19	8.74	2720	140.6	2380	1900	9.04	2840	22	100	2070
	9.34	2960	162.4	18.36	98.58	9.64	3120	178.9	2340	2470	9.95	3280	23	94.5	2540
	10.25	3440	191.7	22.44	131.53	10.55	3760	191.7	2310	2540	10.85	4040	25	89	2540
	11.15	4400	191.7	23.12	174.03	11.45	4680	191.7	2260	2530	11.76	4960	27	78.8	2270
	12.06	4960	178.2	14.96	168.58	12.36	4160	12.8	1000	1610	12.66	3240	26	100	1100
	12.96	3400	111.3	12.24	83.25	13.26	3360	129.3	1000	2130	13.57	3440	26	0	1410
	13.87	3360	10.5	1.02	3.69	14.17	3320	11.3	1000	1100	14.47	3280	26	0	1060
	14.77	3200	12	0	5.69	15.08	3120	12	1000	1030	15.38	3040	27	0	1020
	15.68	2960	12	0	6.69	15.98	2840	12.8	1000	1020	16.28	2760	28	0	1020
	16.58	2680	12.8	0	6.94	16.89	2600	12.8	1000	1020	17.19	2520	29	0	1020
	17.49	2440	12.8	0	6.06	17.79	2360	13.5	1000	1020	18.09	2280	29	0	1020
	18.39	2040	13.5	0	5.78	18.7	1640	14.3	1000	1010	19	1280	30	0	1010
	19.3	1160	22.6	2.38	4.92	19.6	1080	18	1000	1010	19.89	1000	30	0	1000
	20.19	920	18.8	2.38	3.47	20.5	1280	12.8	1000	1000	20.81	1600	31	0	1000
	21.11	2040	12	1.7	5.17	21.41	2480	12	1000	1000	21.71	2280	31	0	1000

Something not quite right it may seem....

Thoughts...

 

[Big_daddy]

It does looks like overboosting but we need better run logs to the red line plz.

 

[james walker]

need to log from 2500 to redline in 3rd to get some decent logs... maf readings all over due to revs up and down.

cant read boost properly unless through a good rev range.

actual is over specified though

try better logs mate

 

[pekingprawn]

yeh sorry about that

this time i found a longer stretch of road but it was still pretty wet. tried going from third, kept spinning, changed into 4th, was still spinning but i held out as long as i could but alas couldnt get to redline as i ran out of road again!

	Group A:	'002				Group B:	'115				Group C:	'118			
		Engine Speed	Engine Load	Injection Timing	Mass Air Flow		Engine Speed	Engine Load	Boost Pressure	Boost Pressure		Engine Speed	Intake Air	Wastegate (N75)	Boost Pressure
	TIME	(G28)			(G70)	TIME	(G28)		(specified)	(actual)	TIME	(G28)	Temperature (G42)	Duty Cycle	(actual)
Marker	STAMP	 /min	 %	 ms	 g/s	STAMP	 /min	 %	 mbar	 mbar	STAMP	 /min	°C	 %	 mbar
	0.6	2280	64.7	6.46	30.81	0	2240	42.9	990	1040	0.3	2240	21	0	1040
	1.51	2440	108.3	9.86	54.89	0.9	2320	85	2280	1140	1.21	2360	21	100	1270
	2.41	2680	145.9	15.3	80.94	1.81	2480	121.1	2390	1560	2.11	2600	21	100	1730
	3.32	3000	155.6	14.96	74.36	2.72	2840	157.9	2320	2140	3.02	3000	21	89.4	2370
	4.22	3280	139.1	12.58	98.44	3.62	3080	115	1530	1830	3.92	3160	18	100	1450
	5.13	4040	191.7	22.78	172.69	4.53	3360	169.2	2280	2250	4.83	3600	21	93.3	2540
	6.03	5200	187.2	20.06	180.42	5.43	4480	191.7	2270	2540	5.73	4840	24	81.6	2520
	6.94	4120	88.7	9.52	68.11	6.34	5560	172.9	2040	2170	6.65	5280	27	0	1890
	7.84	4640	191.7	21.76	187.72	7.24	4200	121.1	2220	1540	7.54	4360	27	100	2320
	8.75	5400	173.7	17.68	177.22	8.15	4960	191.7	2240	2530	8.45	5280	30	78.4	2320
	9.65	5400	178.9	19.38	184.94	9.06	5440	171.4	2240	2190	9.35	5600	32	83.9	2210
	10.56	5640	172.2	18.36	184.83	9.96	5680	173.7	2230	2220	10.27	5720	34	83.9	2200
	11.47	4840	82	11.9	92.08	10.86	5640	172.9	990	2210	11.16	5120	34	0	1720
	12.37	4400	191.7	23.12	174.64	11.77	4240	136.8	2230	1800	12.07	4280	33	94.5	2540
	13.28	4560	179.7	18.36	158.25	12.67	4480	191.7	2270	2540	12.97	4520	36	80	2440
	14.18	4720	175.9	18.7	158.64	13.58	4600	179.7	2270	2280	13.88	4680	36	80.4	2270
	15.1	4840	175.9	18.7	160.92	14.48	4760	177.4	2260	2270	14.79	4880	37	81.2	2250
	15.99	5000	175.9	18.7	166.67	15.39	4920	175.9	2250	2240	15.69	5000	38	80.8	2270
	16.91	5160	175.9	18.7	172.58	16.29	5040	175.2	2250	2210	16.59	5080	39	80.8	2250
	17.8	5280	178.2	19.04	178.22	17.21	5160	175.9	2270	2220	17.5	5200	39	82	2230
	18.71	5360	175.2	18.7	180.03	18.1	5280	175.9	2270	2260	18.42	5320	39	82.7	2240
	19.62	5480	176.7	18.7	183.33	19.01	5400	178.2	2260	2230	19.32	5440	41	83.1	2230

 

[james walker]

ha ha ha.... spinning in 3rd and 4th... what id do mate is wait for a dry day and find a nice long stretch of road.. the rev range isnt consistent there so hard to read full maf and futy cycle.

start at 2.5k and redline it in 3rd pal.

maf does look a little high at 187g/s peak, what induction you running? also what bhp you pulling mate? i see its ko4, is that the hybrid conversion, if so maf figures may be fine.

boost looks okay, but hard to tell without proper power run.

 

[pekingprawn]

I'm running the Evolution Motorsports V-Flow Intake with a custom dual airfeed from the bumper pods. I would have thought that 187 g/s is a little low?

I've not had the car rolling roaded but its stage 3 custom code mapped and was hoping it was pushing circa 270 bhp and 290 lbft of torque, im not sure if these figures suggest this but as you say, i need a dry run!

its a stock k04-023, and it seems like it's doing a decent job?

 

[Big_daddy]

Yeh get it done in a nice dry stech (private rd of course). If the car spinning, then it effectin reading espically if the tcs is on.

 

[pekingprawn]

Indeed. I was borrowing a cable from someone last night so i'm awaiting my serial pcmcia card so i can use another cable i have.

Traction control was turned off mind you, but i do need a dry run, as those maf figures seem very low to me and im not happy about maxing out the boost sensor at 2530mbar as thats a spike that could be higher than 1.5 bar

 

[pekingprawn]

new filter required perhaps?

 

[Big_daddy]

well give it a clean and relog it 1st,

 

[mrwookie]

The 1.8T engines when running Custom Code maps seems to flow highest just shy of the red line so another run, as recommended by others, would be needed and idealy 4th gear would be best for this but your looking at jail terriorty speeds so be careful.

With the flow of 187g/s this equates to 243 ish bhp @4640 rpm and my LCR which last run 277bhp flows 162g/s at the same rpm.

Also notice that 4640rpm was the only point that you had the throttle 100% pressed.

Lets see what the new logs come back with......

 

[pekingprawn]

Hmm well that is interesting, thanks for that.

I think the boost is perhaps a bit high, and by the looks of it the turbo is very capable. It's only covered 12k miles so i'm thinking the turbo is doing a good job, plus it also seems to hold 1.2 bar at 5400 rpm so it's positive on that front i guess.

If you're running 277bhp and flowing almost 30 g/s less at the same rpm, would that not mean im running MORE than 280 bhp? I'd be amazed if that was the case, i've been told over and over again by certain people that i'll never make more than 270 bhp with a stock turbo / manifold and the weaker AUM bottom end....

 

[mrwookie]

Hmm well that is interesting, thanks for that.

I think the boost is perhaps a bit high, and by the looks of it the turbo is very capable. It's only covered 12k miles so i'm thinking the turbo is doing a good job, plus it also seems to hold 1.2 bar at 5400 rpm so it's positive on that front i guess.

If you're running 277bhp and flowing almost 30 g/s less at the same rpm, would that not mean im running MORE than 280 bhp? I'd be amazed if that was the case, i've been told over and over again by certain people that i'll never make more than 270 bhp with a stock turbo / manifold and the weaker AUM bottom end....

Only thing I would say is that my engine is BAM but we are running the same turbo. Try doing a full run to the redline and see what we have then.