LCR Performance... MAF log enclosed

[RobM]

I've posted before about this, but I'm consistently having performance problems with my LCR. The problem is, it doesn't perform!

I've just had the opportunity to go out and get a MAF log with VAG-COM and I wondered if somebody could check it out for me and let me know what they think? I'm no expert, but from searching, reading and remembering figures discussed before the figures I've got here seem really low?

Anyway, here you go, I did two runs with it. Both times I started it when I had the chance to put my foot down for a long stretch from first gear so hopefully the numbers are useful.

This is the first run.... block 003

	Group A:	'003			
		RPM	Mass Flow	Load	Ign. Timing
	TIME				
Marker	STAMP	 /min	 g/s	%	 °BTDC
	0.36	720	4.31	2	3
	0.77	760	4.31	2	2.3
	1.27	720	4.31	2	3.8
	1.67	760	4.28	2	3
	2.18	1280	14.81	9.4	21
	2.68	1480	17.31	11	23.3
	3.08	1360	16.94	11.8	20.3
	3.49	1320	17.17	12.2	18.8
	3.99	1480	18.22	12.2	15.8
	4.39	1760	21.89	13.7	24
	4.81	2040	23.75	13.3	27
	5.2	2280	25.39	14.1	28.5
	5.6	2640	46.42	31	24.8
	6.1	3400	76.44	100	26.3
	6.5	4120	86.69	100	25.5
	6.92	4800	102.33	100	26.3
	7.32	5440	117.97	100	27
	7.73	5920	100.94	32.9	3.8
	8.21	4600	116.39	78	30.8
	8.63	4280	89.47	99.6	24.8
	9.12	4640	99.36	100	26.3
	9.52	4960	105.89	100	26.3
	10.04	5320	113.5	100	27
	10.53	5680	122.25	100	27
	10.93	5960	127.25	100	26.3
	11.35	6200	130.78	100	26.3
	11.73	5840	6.56	7.5	36.8
	12.15	4560	105.97	97.3	24
	12.55	4720	100.92	99.6	26.3
	12.95	4880	104	100	26.3
	13.35	5000	108.94	100	27
	13.75	5160	111.75	100	27
	14.26	5360	114.33	100	27
	14.76	5520	118	100	26.3
	15.16	5640	121.39	100	26.3
	15.57	5800	125.25	100	25.5
	16.07	5960	127.25	100	25.5
	16.47	6080	129.17	100	25.5
	16.87	6120	8.83	7.5	3.8
	17.27	4640	122.64	84.7	29.3
	17.67	4880	107.67	100	13.5
	18.08	4960	107	100	25.5
	18.48	5000	107.67	100	27
	18.98	5080	110.11	100	26.3
	19.38	5160	110.83	100	27
	19.89	5240	112.56	100	27
	20.39	5320	114.81	100	26.3
	20.79	5400	81.17	52.2	9
	21.19	5080	6.19	7.5	5.3
	21.6	4360	101.53	94.5	13.5
	22.1	4400	92.56	100	26.3
	22.5	4440	94.69	100	26.3
	22.9	4480	94.58	100	26.3
	23.3	4520	96.67	100	14.3
	23.71	4520	98.06	100	26.3
	24.21	4560	97.06	100	27
	24.61	4600	100.36	100	26.3
	25.01	4640	5.44	6.3	5.3
	25.41	3760	85.83	95.3	26.3
	25.83	3760	80.39	100	25.5
	26.23	3800	80.08	100	26.3
	26.63	3760	12.08	7.1	36.8
	27.03	3760	6.22	5.9	18.8
	27.43	3720	9.08	6.3	2.3
	27.94	3640	8.81	5.5	3.8
	28.34	3560	9.14	5.5	3.8
	28.74	3480	9.58	5.5	2.3
	29.14	3360	9.47	5.5	2.3
	29.54	3280	9.08	5.5	2.3
	30.05	3160	9.11	5.1	2.3
	30.45	3080	8.94	5.1	2.3
	30.94	3000	8.58	5.1	1.5
	31.34	2880	8.47	4.7	1.5
	31.74	2800	8.28	4.7	1.5
	32.14	2720	8.03	4.7	0.8
	32.54	2680	8.28	4.7	0.8
	32.96	2640	7.69	4.3	0.8
	33.36	2600	7.92	4.3	0.8
	33.76	2560	7.58	4.3	0.8
	34.16	2560	7.61	4.3	0.8
	34.56	2480	7.31	4.3	0
	34.96	2440	7.31	3.9	0
	35.38	2400	6.89	3.9	0.8
	35.76	2320	6.89	3.9	0.8
	36.18	2280	6.61	3.5	1.5
	36.58	2240	6.58	3.5	1.5
	36.98	2160	6.47	3.5	2.3
	37.38	2160	6.14	3.5	2.3
	37.79	2120	6.22	3.5	3
	38.29	2080	6.17	3.5	3
	38.78	2040	6.11	3.1	3.8
	39.18	2000	5.83	3.1	3.8
	39.6	1960	5.72	3.1	4.5
	40.1	1920	5.69	2.7	5.3
	40.59	1880	5.61	2.7	5.3
	40.99	1840	5.53	2.7	6
	41.39	1800	5.47	2.7	6
	41.81	1800	5.31	2.7	6
	42.21	1760	5.36	2.7	6.8
	42.61	1760	5.39	2.7	6.8
	43.01	1760	5.31	2.7	6.8
	43.41	1760	5.25	2.7	6.8
	43.92	1720	5.22	2.7	6.8
	44.41	1720	5.25	2.7	6.8
	44.81	1720	5.25	2.7	6.8
	45.21	1680	6.03	3.5	10.5
	45.61	1720	7.14	3.9	23.3
	46.03	1680	8.06	4.7	26.3
	46.54	1680	8.81	5.5	28.5
	47.02	1680	9.83	5.9	27
	47.44	1680	10.61	6.7	27
	47.84	1680	10.75	6.7	26.3
	48.25	1680	11.06	7.1	28.5
	48.75	1680	11.5	7.1	28.5
	49.16	1680	11.61	7.5	27.8
	49.55	1680	12.06	7.5	27.8
	49.95	1680	12.06	7.5	30
	50.35	1680	12.39	7.5	30
	50.85	1680	12.22	7.5	30
	51.26	1680	12.14	7.5	30
	51.77	1680	12.28	7.5	30

 

[RobM]

And this is the second, this time logging 002...

	Group A:	'002			
	RPM	Load	Inj. On Time	Mass Flow
	TIME				
Marker	STAMP	 /min	%	 ms	 g/s
	0.47	1960	40.6	3.4	16.53
	0.98	2080	29.3	2.38	12.67
	1.48	2200	38.3	3.74	20.22
	1.88	2360	42.1	3.74	21.28
	2.27	2520	40.6	3.74	21.83
	2.69	2680	39.1	3.4	22.44
	3.09	3000	79.7	8.16	57.17
	3.49	3560	101.5	9.86	78.47
	3.89	4200	100	9.18	87.97
	4.29	4840	98.5	9.52	100.36
	4.8	5600	98.5	9.52	115.53
	5.31	6320	98.5	9.18	127.81
	5.79	6440	15.8	1.36	0.39
	6.21	4880	101.5	10.88	117.25
	6.71	4760	100	9.52	97.33
	7.11	5000	100	9.86	105.47
	7.62	5320	101.5	9.86	112.72
	8.02	5560	101.5	9.86	114
	8.42	5800	104.5	10.54	119.06
	8.82	6040	103.8	9.86	124.53
	9.22	6240	103.8	9.86	127.83
	9.63	6440	104.5	9.52	129.61
	10.03	6600	97	8.84	90.61
	10.43	6200	35.3	8.84	25.56
	10.83	4760	106.8	10.54	102.72
	11.23	4880	103.8	10.2	101.5
	11.73	5040	103	10.2	103.92
	12.13	5160	104.5	10.88	106.39
	12.55	5240	100.8	9.52	110.44
	13.04	5400	105.3	10.88	110.56
	13.44	5480	103	9.86	114.5
	13.84	5640	104.5	10.54	117.03
	14.26	5760	104.5	9.86	119.5
	14.75	5920	108.3	11.56	122.25
	15.15	6040	105.3	9.18	85.86
	15.55	5720	44.4	8.84	34.11
	15.95	4800	106.8	10.88	102.44
	16.37	4880	103.8	10.2	102.92
	16.77	4960	103.8	9.86	103.36
	17.26	5040	101.5	9.52	105.25
	17.66	5120	103	9.86	106.69
	18.06	5160	104.5	10.2	108.11
	18.48	5240	103.8	9.86	110.42
	18.98	5320	103.8	9.86	110.36
	19.38	5240	13.5	1.36	5.61
	19.78	4200	37.6	4.42	34.42
	20.18	4280	42.9	4.08	37.75
	20.59	4240	14.3	1.36	7.39
	20.99	4200	14.3	1.36	10.86
	21.39	4160	12	0	10.11
	21.79	4160	12	0	10.44
	22.19	4080	12	0	10.14
	22.59	4040	12	0	10.03
	22.99	3960	12	0	10.22
	23.41	3880	12	0	10.14
	23.9	3720	12	0	9.83
	24.4	3560	12	0	9.47
	24.82	3440	12.8	0	9.97
	25.3	3280	12.8	0	9.14
	25.71	3200	12.8	0	9.19
	26.22	3160	15	2.04	10.39
	26.7	3080	13.5	0	9.11
	27.12	3080	13.5	0	8.89
	27.52	3040	13.5	0	8.83
	27.93	3000	13.5	0	8.75
	28.43	2960	21.8	2.38	14.33
	28.83	2920	46.6	4.42	30.39
	29.23	2920	47.4	4.42	30.25
	29.63	2920	46.6	4.42	29.5
	30.05	2960	46.6	4.42	29.14
	30.45	2960	46.6	4.08	29.33
	30.85	2960	47.4	4.42	29.28
	31.34	3000	88.7	9.18	64.56
	31.74	3040	105.3	10.2	66.03
	32.16	3120	105.3	9.86	65.47
	32.56	3160	106.8	10.2	67.97
	32.96	3200	107.5	10.2	68.14
	33.36	3280	109	9.86	69.03
	33.76	3320	109	9.86	71.56
	34.27	3400	109	9.86	72.94
	34.67	3480	109.8	10.2	73.58
	35.07	3520	109.8	9.86	74.39
	35.47	3560	109.8	9.86	75.28
	35.87	3640	110.5	10.2	76.75
	36.38	3680	109.8	9.86	78
	36.88	3760	109.8	9.86	77.94
	37.28	3800	109	10.2	79.44
	37.68	3840	109	10.2	80.83
	38.08	3920	109	9.86	82.39
	38.59	3960	108.3	10.2	83.28
	38.99	4000	107.5	10.2	84.25
	39.39	4040	103.8	9.18	81.31
	39.79	4040	20.3	1.7	5.83
	40.2	4040	14.3	1.36	8.25
	40.7	4000	12	0	8.92
	41.1	3960	12	0	9.72
	41.6	3920	12	0	10.08
	42.01	3880	12	0	9.81
	42.51	3840	12	0	10.11
	43.02	3760	12	0	10
	43.52	3720	12	0	9.72
	43.92	3720	12	0	9.78
	44.41	3640	12	0	9.78
	44.81	3640	12	0	9.61
	45.21	3600	12	0	9.83
	45.61	3560	12	0	9.83
	46.03	3520	12.8	0	10.08
	46.43	3480	13.5	0	9.86
	46.94	3480	13.5	0	9.83
	47.34	3440	13.5	0	9.78
	47.72	3400	13.5	0	9.81
	48.14	3360	13.5	0	10.08
	48.64	3320	13.5	0	9.69
	49.04	3320	13.5	0	9.72
	49.45	3280	13.5	0	9.69
	49.95	3240	13.5	0	9.44
	50.35	3200	13.5	0	9.58
	50.75	3160	13.5	0	9.56
	51.15	3160	13.5	0	9.36
	51.56	3120	13.5	0	9.06
	52.06	3080	13.5	0	9.36
	52.46	3040	13.5	0	9.14
	52.87	3000	13.5	0	9.11
	53.35	3000	13.5	0	9.08
	53.77	2960	13.5	0	8.92
	54.27	2920	13.5	0	8.78
	54.67	2880	13.5	0	8.81
	55.08	2840	15.8	1.7	9.67
	55.48	2800	15.8	1.7	9.89
	55.99	2800	16.5	1.7	10.17
	56.49	2760	18.8	2.04	11.31
	56.89	2760	28.6	2.72	16.86
	57.29	2720	34.6	3.4	21.08
	57.69	2720	35.3	3.4	21.14
	58.11	2720	24.8	2.38	12.69
	58.51	2680	16.5	1.36	9.06

Any help, advice and explanations would be really appreciated

Cheers

Rob

 

[Ruddmeister]

I'm no VAG Com expert but the MAF g/s readings for a remapped LCR are around 195 - 205 range, yours are nowhere near, looks as though it's faulty and reading low to me.

Any fault codes logged with VAGCOM?

Can you borrow / swap the MAF with a mate? should be circa £80 on exchange at somewher like GSF anyway.

 

[RobM]

Oh, one other thing, I'm still getting the fault code:

17705 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)

Would this tie in with MAF problems? The car is standard other than a Forge 007P DV, and I cannot find any obvious problems with pipes or connections, everything seems nice and tight.

 

[Ju.]

I think a standard LCR should be around the 160/170 gs peak, also most people say use 4th gear to do logs although I use 3rd.
Yours do look very low though.
Are you sure you don't have a split pipe somewhere?

 

[m0rk]

Are you sure you don't have a split pipe somewhere?

reckon so!

Do a log of 118 and 115 - this will show us if you've got a boost leak

 

[RobM]

What does 118 and 115 log? And can I do that with the shareware version of VAG-COM? If so, I'll get on and do that tomorrow.

If it turns out I do have a boost leak, how easy is it to track down the exact location of this and, more importantly, put it right?

 

[pickie]

you need the FULL ver to do blocks 118 and 115

 

[DPJ]

115	Engine Speed	Engine Load	Spec. Boost	Actual Boost
118	Engine Speed	Intake Air Temp	Boost Duty Cycle	Actual Boost

 

[RobM]

Cheers, I've ordered a licence for the full version so will get on and do that.

Incidentally, I tried driving the car earlier with the MAF unplugged and it seemed perfect and drove really nicely. Power was as I would expect. However it still logged a couple of errors, including the one above, a 'low signal from MAF' and a message about running rich... the last two I assume were directly related to the MAF being disconnected?

Will do the same tomorrow if I get the chance, I'll try and run the car with MAF and without MAF back-to-back to make it fair.

 

[Ju.]

That does point to a dodgy MAF sensor as the ECU will substitute it's own values for the maf readings when it's unpugged

 

[J@mes]

Cheers, I've ordered a licence for the full version so will get on and do that.

Incidentally, I tried driving the car earlier with the MAF unplugged and it seemed perfect and drove really nicely. Power was as I would expect. However it still logged a couple of errors, including the one above, a 'low signal from MAF' and a message about running rich... the last two I assume were directly related to the MAF being disconnected?

Will do the same tomorrow if I get the chance, I'll try and run the car with MAF and without MAF back-to-back to make it fair.

as said this indicates a dodgy maff!

oh anmd both those codes are due to it being unplugged imo


you should be sucking in high 190s/low 200s

 

[m0rk]

is it a mapped car? I might have missed it

 

[Feel]

"Standard apart from Forge DV"

So, 160 g/sec then?

 

[J@mes]

doh!

my bad, i ASSUMED it was mapped!

 

[vern]

That log means little.. looks like you went up through the gears.

You need to get a rolling start and nail it in 4th from 1.5K revs, this will load up the engine / turbo it ensure better readings......

Service the DV also and check all the pipes for splits very carfully

might be worth while cleaning the maf too, before replacing have a search loads of info, and the codes are indeed due to un plugging the maf

 

[J@mes]

as ever good advice from vern!


good idea to try and clean the maff before buying a new one!

 

[RobM]

Cheers for the advice!

Vern - The DV shouldn't need a service as it's only two weeks old and was bought new.

I'll re-do the logs again today if I can, this time in 4th gear only. I'll post back when done

 

[Feel]

If the DV is brand new - check that the 'o' rings are correctly seated and all there etc.

But it does sound like the MAF

 

[DPJ]

I take it you have tried clearing the
17705 - Pressure Drop between Turbo and Throttle Valve
code
and that it comes straight back??