AUQ dropping power when hot?

[d_jones]

AUQ - ECU cutting throttle

Hi,

To cut a long story short has anybody ever seen the ECU cut the throttle at a certain point in the rev range (in my case usually around 6200) despite the pedal staying at 100%

I noticed some small dips in power, did some VAG COM logs (in 3rd gear) and despite it looking like boost gets pulled the main thing is this pulling of 100% throttle (boost could just be a by-product).

It actually dips to 40% then after a few split seconds resumes 100%.

The car is running a stage 2 remap if thats relevent at all.

Thanks for any ideas!

 

[DPJ]

Any fault codes?

 

[d_jones]

Sorry, I should have mentioned that.

There are no fault codes. (which is a shame!!)

 

[DPJ]

Could you post the power runs from your logs?

 

[longman]

Does it do this every time at the same point in the rev range?

I don't suppose VAG-COM shows any missfires does it? Although it would usually show it as a fault code, you can check in measuring blocks 14, 15 and 16 against RPM.

It could be the beggining of your Coil Pack/s going or sparking problems.

How does it tick over? Is that smooth?

 

[d_jones]

It does it roughly at the same points but not the exact same points.

There are no missfires in the missfire blocks.

Tickover is smooth as silk.


DPJ - What do you mean? An air flow graph or the boost graph?

 

[d_jones]

Here is a 3rd gear boost log.

Notice how boost is pulled 6 or 7 times.

 

[DPJ]

I meant post the power runs from ALL the logs you did.

 

[d_jones]

I only did one log run per block.

Some of them like air mass only shows 2 dips as on that run it only did it twice.

I logged:

Air Mass. This just shows two small dips.

Boost. As above.

One I thought was timing but probably isnt as its all over the place.

Cat temperature. This peaks at 825deg C

Throttle position (vs actual throttle angle). This run only had one dip. Both lines are at 100% until around 6000 RPM where the throttle plate closed to 40% then resumes back to 100% a few tenths later.

 

[DPJ]

I am trying to spot the cause, not the symptoms......

You didn't log 020, 118, 031 or 032?

 

[longman]

I wonder if there is a communication issue between the Throttle Pedal and the Throttle Valve.

What would cause the vavle to suddenly close slightly if the Pedal is fully down?

 

[d_jones]

Firstly, thanks for the replys DPJ (and everybody else) - much appretiated.

To be honest we didnt really know what to log to get the best results for fault finding.

31 rings a bell but I'm not sure about the rest.

If 020, 118, 031 or 032 are the key I will log them tonight and post back the results.

Are there any more that would be useful?


ps. my vag com only refreshes around 3 times per second so I can only log one block at once.

 

[DPJ]

Firstly, thanks for the replys DPJ (and everybody else) - much appretiated.

To be honest we didnt really know what to log to get the best results for fault finding.

31 rings a bell but I'm not sure about the rest.

If 020, 118, 031 or 032 are the key I will log them tonight and post back the results.

Are there any more that would be useful?


ps. my vag com only refreshes around 3 times per second so I can only log one block at once.

3 refreshes / sec is about normal.

Log 003 / 020 together
Log 115 / 031 together
Log 118 / 032 together.

4th gear runs preferably 2k > limiter.

 

[d_jones]

I will log them tonight and get back with the results as soon as I can.

Thanks.

 

[d_jones]

Here is what I could get from the logs……

Log 003 / 020

On this run the car didn’t seem too bad.

Block 20 showed 0 for everything. Throttle angle stayed at 100% and here is air mass and ignition angle.

Log 115 / 031

On this run it did it more than the first run.

Here is boost with the AFR (based on 14.65 x lambda), Lambda factor and engine load.

Log 118 / 032

On this run it did it a fair bit.

Idle 02 adaption stayed at 1.1 and run o2 adaption stayed at 3.1 all the way through.

Here is boost, boost, duty cycle and air temp.

Does that shed any light?

When the tuner setup the stage two software he noted that there were a few fuel problems which he though was probably the fuel pump not running 100%. He fitted a 4 bar regulator and said that seemed to solve the fuel issue. That might add something to this, I don’t know.

 

[DPJ]

Graphs are very nice, but it's convention here that we post the logs. Could you do that?

For example http://www.seatcupra.net/forums/showthread.php?t=180164

 

[d_jones]

Ah, sorry.

I'll try......

	Group A:	'003				Group B:	'020				Group C:	 Not Running
		Idle speed	Air mass in	Throt Angle	Ignit Angle		Idle Stabilization	Idle Stabilization	Idle Stabilization	Idle Stabilization		
	TIME	700-820 rpm	2.0-4.5 g/s	0.2-4.0%	0-12 BTDC	TIME					TIME	
Marker	STAMP	 /min	 g/s	%	 °BTDC	STAMP	 CF	 CF	 CF	 CF	STAMP	
	29.82	1880	40.81	100	9.8	29.21	0	0	0	0		
	31.02	2200	57.19	100	7.5	30.43	0	0	0	0		
	32.24	2560	86.92	100	6	31.69	0	0	0	0		
	33.34	3000	124.72	100	4.5	32.83	0	0	0	0		
	34.45	3520	138.72	100	9.8	33.94	0	0	0	0		
	35.55	4000	155.78	100	6	35.04	0	0	0	0		
	36.66	4440	167.39	100	7.5	36.07	0	0	0	0		
	37.94	4880	175.69	100	8.3	37.33	0	0	0	0		
	39.08	5280	180.97	100	12	38.47	0	0	0	0		
	40.29	5640	182.08	100	12.8	39.68	0	0	0	0		
	41.39	5920	182.39	100	15.8	40.88	0	0	0	0		
	42.51	6160	184.42	100	15.8	41.98	0	0	0	0		
	43.78	6440	183.78	100	15	43.11	0	0	0	0		
	44.9	6640	186.22	100	18	44.32	0	0	0	0		
	46.02	6800	184.78	100	18	45.42	0	0	0	0		
	47.12	6960	186.36	100	18.8	46.52	0	0	0	0

	Group A:	'115				Group B:	'031				Group C:	 Not Running
		Engine Speed	Engine Load	Spec. Boost	Actual Boost		Lambda Factor	Lambda Factor	Bin. Bits	Bin. Bits		
	TIME	700-6800 RPM	15-150%	990-1800 mbar	<=1800 mbar	TIME					TIME	
Marker	STAMP	 /min	%	 mbar	 mbar	STAMP					STAMP	
	0	1280	52.6	1000	1040	0.5	1.016	1	14.8844	14.65		
	1.01	1360	82.7	1560	1100	1.51	0.992	1	14.5328	14.65		
	2.18	1520	91.7	1640	1240	2.72	0.953	0.953	13.96145	13.96145		
	3.32	1720	100	1770	1350	3.82	0.93	0.945	13.6245	13.84425		
	4.33	1960	110.5	2290	1470	4.93	0.922	0.938	13.5073	13.7417		
	5.43	2240	133.8	2470	1700	5.93	0.93	0.938	13.6245	13.7417		
	6.54	2600	170.7	2540	2150	7.05	0.945	0.93	13.84425	13.6245		
	7.66	3040	191.7	2510	2540	8.33	0.953	0.93	13.96145	13.6245		
	8.85	3560	191.7	2420	2500	9.36	0.899	0.891	13.17035	13.05315		
	9.96	4000	191.7	2460	2420	10.46	0.86	0.86	12.599	12.599
	10.97	4400	191.7	2420	2340	11.58	0.828	0.836	12.1302	12.2474
	12.19	4800	187.2	2380	2300	12.78	0.821	0.821	12.02765	12.02765
	13.38	5200	178.9	2380	2130	13.94	0.797	0.813	11.67605	11.91045
	14.54	5520	171.4	2380	2050	15.09	0.821	0.813	12.02765	11.91045
	15.59	5800	163.2	2340	1920	16.2	0.805	0.813	11.79325	11.91045
	16.81	6080	161.7	2330	1810	17.31	0.789	0.805	11.55885	11.79325
	17.92	6320	151.9	2330	1870	18.51	0.789	0.797	11.55885	11.67605
	19.02	6520	146.6	2330	1880	19.63	0.789	0.789	11.55885	11.55885
	20.3	6720	145.1	2320	1810	20.84	0.789	0.797	11.55885	11.67605
	21.45	6880	141.4	2320	1830	22.03	0.789	0.797	11.55885	11.67605
	22.54	7000	138.3	2320	1770	23.14	0.914	0.774	13.3901	11.3391

	Group A:	'118				Group B:	'032				Group C:	 Not Running
		Engine Speed	Air Temp In	Boost Dut Cyc	Actual Boost		Idle O2 Adapt	Run O2 Adapt	 	 		
	TIME	700-6800 RPM	<=110 C	0-100% 	<=1800 mbar	TIME	-10.1	-10.1	 	 	TIME	
Marker	STAMP	 /min	°C	%	 mbar	STAMP	%	%			STAMP	
	0.74	1520	30	95.3	1230	1.24	1.1	-3.1	        	        		
	1.77	1720	28	95.3	1340	2.35	1.1	-3.1	        	        		
	2.85	1920	27	95.3	1470	3.41	1.1	-3.1	        	        		
	4.05	2240	27	95.3	1710	4.56	1.1	-3.1	        	        		
	5.18	2600	27	95.3	2210	5.78	1.1	-3.1	        	        		
	6.37	3080	27	83.9	2520	6.99	1.1	-3.1	        	        		
	7.59	3600	27	80.8	2520	8.19	1.1	-3.1	        	        		
	8.8	4120	27	83.5	2420	9.45	1.1	-3.1	        	        		
	10.07	4600	29	95.3	2270	10.61	1.1	-3.1	        	        		
	11.21	5040	30	95.3	2210	11.72	1.1	-3.1	        	        
	12.31	5360	31	86.7	2080	12.81	1.1	-3.1	        	        
	13.42	5680	32	70.2	1900	14.04	1.1	-3.1	        	        
	14.63	5920	33	83.9	1780	15.25	1.1	-3.1	        	        
	15.93	6200	34	70.2	1900	16.45	1.1	-3.1	        	        
	17.05	6440	36	80	1870	17.65	1.1	-3.1	        	        
	18.15	6600	37	60.8	1900	18.76	1.1	-3.1	        	        
	19.38	6720	36	71	1560	19.96	1.1	-3.1	        	        
	20.56	6880	39	72.2	1700	21.17	1.1	-3.1	        	        
	21.85	5400	36	0	1100	22.38	1.1	-3.1	        	        
	22.97	4400	36	0	1060	23.58	1.1	-3.1	        	        
	24.18	4160	36	0	1770	24.78	1.1	-3.1	        	        
	25.38	3840	36	0	1050	25.89	1.1	-3.1	        	        
	26.4	3600	36	0	1040	26.99	1.1	-3.1

Is that OK?

 

[DPJ]

That's better, cheers.

Requested not meeting actual.........

K03S? What stage 2 map is it?- the requested is rather optimistic, IMO....

 

[DPJ]

I wouldn't say it was cutting the throttle, I would say the ecu is making the N75 pull back because the map is asking too much.....

 

[d_jones]

On one of the runs we logged even though throttle was 100% down, the plate closed to 40% briefly. Not sure if that was the ECUs last ditch attempt at cutting boost or something?!?!?

Its a K03S yeah.

Modifications are:
Forge Motor sport front mounted intercooler
Forge Motor sport turbo intake pipe
Forge Motor sport diverter valve (yellow spring)
Green cotton air filter element
Denso Iridium IK22 spark plugs (0.8mm gap)
Milltek Hi flow sports cat and downpipe (2 ½ inch)
Milltek full cat back exhaust system (2 ½ inch)
Spec Stage 2 clutch
Peloquin LSD

The map was done by CC.

Could it be a faulty N75? (I have no idea to be honest!!!)