Poor Boost figures for a Stage 1 map - Requested Boost way too low - Now with logs

[gex18]

Hmmm for me it will be challenging, believe me!

I have also managed to lose the damned bolts / O ring for the blanking plate so am awaiting a reply off forge as to wether I need to buy the kit again or not

It has also been suggested that the first lambda sensor could be affecting the boost. As it's decatted there is always a lambda error code logged on vagcom - could this be causing the ECU to be pulling fuelling and thus boost back?

 

[wild willy]

Also as my car has had the N249 bypass done, if this was done incorrectly could it be holding it back? Here is a photo of the engine bay (not that it helps) :

i like your cold air feed adapter connected to the front grill,do have any close up pics and where did you get it from.

 

[Ric 2001]

Its hardly a big job lol. There's 3 bolts that hold the bit to the engine block, and the blank plate is 2 bolts in its place. You'll have to remove the filter for easier access, but thats not exactly tricky The only issue is that one of the bolts is hard to remove as the more it unscrews, the tighter it presses against another coolant pipe (i think), but persevere and you'll get there, I did

I wouldn't have thought it does your car any good running like that to be honest. If it did, then Forge wouldn't sell blank plates for it

I've done this, quite an easy job. One of the bolts is abit of a PITA.

Rich did you reused the original gasket as well?

 

[R1ch85]

I've done this, quite an easy job. One of the bolts is abit of a PITA.

Rich did you reused the original gasket as well?

No, I just used the O-ring that came with the kit.

 

[Damoegan]

i like your cold air feed adapter connected to the front grill,do have any close up pics and where did you get it from.

I run the same setup mate, got it from ebay.

 

[R1ch85]

I run the same setup mate, got it from ebay.

I still run the standard feed, but cable tied higher up so the air is pretty much aimed directly at the filter. Your solution looks alot more flexible though, and larger diameter at that.

It would be nice to get a cold air feed from down in the wing, but the washer bottle is somewhat in the way.

 

[gex18]

Anyone have any ideas or suggestions? Bar changing the first lambda sensor when I upgrade the downpipe and replace the decat or a sports cat i'm out of ideas now

i like your cold air feed adapter connected to the front grill,do have any close up pics and where did you get it from.

Damiens picture gives you a better idea of the setup mate, just look for some cold air ducting on ebay, it was 90mm and here is the link to the item I ordered :

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=260320689364&ssPageName=ADME:B:EOIBSA:GB:1123#ht_2733wt_964
.

 

[gex18]

Any other thoughts on this guys? Still only hitting 0.9 bar at 5k. What would actually cause the ECU to be requesting low boost? A knackered sensor somewhere?

Also on a sidenote, how many threads should the actuator be sitting at stock? Mine has about 16 threads present and I could swear that I read somewhere it should be about 12 threads....

Heres a really poor photo of it lol :

I will get the requested VAGcom logs at the next derby SCN meet all being well

 

[gex18]

Right the plot thickens, did a couple of fresh logs, blocks 002 and 115 as requested, and they can be seen below :

Tuesday	25	May	2010	21:13								
06A 906 032 RP	1.8I R4/5VT         0010									
												
	Group A:	002					Group B:	115				
		Idle speed	Engine load	Inj. period	Air mass in			Engine Speed	Engine Load	Spec. Boost	Actual Boost	
	TIME	700-820 rpm	15-25%	2.0 - 4.0 ms	2.0-4.5 g/s	TIME		700-6800 RPM	15-150%	990-1800 mbar	<=1800 mbar	TIME
Marker	STAMP	 /min	%	 ms	 g/s	STAMP		 /min	%	 mbar	 mbar	STAMP
	11.87	2520	133.1	13.26	69.72	12.27		2600	148.9	2260	1770	
	12.78	2760	162.4	16.32	89.81	13.18		2880	174.4	2230	2120	
	13.58	2960	185.7	21.08	109.72	14.08		3120	188	2210	2300	
	14.49	3280	184.2	21.42	110.03	14.99		3400	176.7	2160	2140	
	15.48	3560	178.2	21.08	120.22	15.9		3680	178.9	2160	2120	
	16.4	3800	174.4	20.74	127.03	16.89		3960	173.7	2140	2120	
	17.31	4080	172.2	20.4	133.53	17.8		4200	173.7	2110	2070	
	18.22	4320	173.7	20.4	145.19	18.62		4440	175.9	2080	2030	
	19.12	4560	170.7	20.06	149.44	19.52		4640	169.2	2030	1940	
	19.93	4720	166.9	19.72	150.47	20.41		4880	164.7	1960	1930	
	20.83	4960	163.2	19.72	154.56	21.23		5040	158.6	1910	1860	
	21.64	5120	157.1	19.38	153.94	22.14		5200	156.4	1880	1830	
	22.54	5280	154.1	19.38	156.64	22.94		5360	151.9	1860	1810	
	23.34	5440	153.4	19.04	158.31	23.75		5480	154.9	1830	1760	
	24.24	5560	148.1	18.7	158.94	24.65		5640	147.4	1810	1740	
	25.05	5680	146.6	18.36	160.89	25.45		5760	146.6	1800	1680	
	25.87	5800	145.9	18.36	159.53	26.27		5880	145.1	1790	1670	
	26.67	5920	140.6	17.68	162.86	27.07		5960	141.4	1780	1680	
	27.47	6040	139.8	17.34	162.64	27.87		6080	139.1	1760	1640	
	28.27	6120	138.3	17.34	160.31	28.67		6160	136.8	1740	1630	
	29.08	6240	136.8	17	161.42	29.48		6280	133.1	1730	1640	
	29.88	6320	132.3	16.32	161.11	30.28		6360	133.8	1720	1620	
	30.68	6400	132.3	16.66	161.36	31.08		6440	131.6	1710	1650	
	31.5	6480	135.3	17	161.75	31.99		6520	130.1	1700	1620	
	32.39	6560	127.1	15.64	162.39	32.91		6600	127.8	1690	1620	
	33.31	6640	127.1	15.64	161.86	33.71		6640	130.8	1680	1530	
	34.2	6680	130.1	16.32	162.11	34.62		6720	126.3	1680	1610	
	35.02	6600	66.9	7.48	153.08	35.4		6120	12	990	1220

Also block 032 (more to see what the results would be due to running the decat)

Tuesday	25	May	2010	21:11
06A 906 032 RP	1.8I R4/5VT         0010	
				
	Group A:	032		
		Idle O2 Adapt	Run O2 Adapt	 
	TIME	-10.1	-10.1	 
Marker	STAMP	%	%	
	0	-0.6	0

Another note, the Voltage on idle of the pre cat lambda (block 033) was showing 1.5v, while the Voltage of the post cat lambda (block 036) was showing 0.1v - surely due to the decat meaning the gases flowing both lambdas are exactly the same the voltages should be similar?

One last note, long term fuel trim on my car was reading at 0.0% which is not realistic is it?

Many thanks for any suggestions made

Cheers

Anthony

 

[Damoegan]

Well the boost is less than 0.1bar out, which shows thers no boost leak..

 

[gex18]

Yeah, as always actual consistently matches requested, so its a problem with low requested boost rather than actual not meeting requested and tbh we are running out of ideas

Also the MAF airflow seems to be about right as per revos suggested figures?

Any ideas mate?

 

[Damoegan]

Yea, airflow is about right for a stage 1 map..

Do you have any logs of block 031?

 

[gex18]

I don't mate, I can get some done tonight though

 

[Damoegan]

Block 031 shows actual Vs requested fueling ..

 

[gex18]

Nice one, what would you expect to see, leaning out or running rich?

 

[Damoegan]

If its lean then the ECU could be pulling boost back a little..

 

[ibizacupra]

look at 001 also for lambda adjust... its what feeds what happens to block 032, but does it real time.
eg.. 031 will have request vs actual lambda, and 001 will show you how much % ecu is having to adjust to achieve the request.. If all is well it should not have to adjust much at all.

 

[gex18]

Logs as requested (sorry they stop early on, but got cut up on my private runway at the last minute)

Blocks 001 and 031

Wednesday	26	May	2010	19:40								
06A 906 032 RP	1.8I R4/5VT         0010									
												
	Group A:	001				Group B:	031				Group C:	 Not Running
		Idle speed	Coolant Temp	Oxygen Sensor	Adj for Basic		Lambda Factor	Lambda Factor	Bin. Bits	Bin. Bits		
	TIME	700-820 rpm	80-110 C	-0.2	1x111111	TIME					TIME	
Marker	STAMP	 /min	∞C	%		STAMP					STAMP	
	17.8	2360	85	-7	1101001	17.31	0.914	1	        	        		
	18.72	2520	85	-5.5	1101001	18.2	1.008	1	        	        		
	19.61	2760	85	-4.7	1101001	19.21	0.945	0.938	        	        		
	20.41	3000	85	-7.8	1101001	20.01	0.875	0.891	        	        		
	21.23	3240	85	-5.5	1101001	20.83	0.891	0.883	        	        		
	22.12	3520	85	-2.3	1101001	21.63	0.883	0.883	        	        		
	22.94	3760	86	-1.6	1101001	22.52	0.883	0.883	        	        		
	23.83	4000	86	-2.3	1101001	23.43	0.875	0.883	        	        		
	24.86	4280	86	-1.6	1101001	24.35	0.867	0.883	        	        		
	25.75	4520	86	-2.3	1101001	25.35	0.867	0.883	        	        		
	26.55	4680	86	-0.8	1101001	26.15	0.875	0.883	        	        		
	27.47	4880	86	0	1101001	26.97	0.867	0.883	        	        		
	28.38	5080	86	1.6	1101001	27.98	0.867	0.883	        	        		
	29.39	5280	87	1.6	1101001	28.87	0.86	0.852	        	        		
	30.28	5440	87	1.6	1101001	29.88	0.844	0.844	        	        		
	31.19	5600	87	3.1	1101001	30.68	0.828	0.836	        	        		
	31.99	5720	87	2.3	1101001	31.59	0.828	0.836

 

[Damoegan]

Fueling looks fine to me mate..

 

[gex18]

Damn

So :

- Fuelling looks fine
- O2 sensor looks fine
- MAF airflow figures look fine
- Requested Vs actual shows actual meets requested every time

So the problem still remains that at 5k its only about 0.9 bar, because the ECU is requesting this much - where do I go from here? As i'm running out of ideas now