Probee's GT2871R LCR

[Wilko]

72mm looks about spot on mate. Odd that some tt's and cupra r's came with different sized mafs.
I've bought quite a few tt 225 mafs over the years, and they've all been 69.6mm

 

[DPJ]

72mm looks about spot on mate. Odd that some tt's and cupra r's came with different sized mafs.
I've bought quite a few tt 225 mafs over the years, and they've all been 69.6mm

My housing was from an S3.

Now's the point we mention my maf under-reads by 10%

 

[Wilko]

wouldn't a smaller one over read dave?

 

[DPJ]

wouldn't a smaller one over read dave?

Exactly...!

 

[Wilko]

lost me dave. I thought yours was 69.6 so if your code was written for that it would read normally, if it was written for a 72mm maf it would over read, so youd have less airflow than indicated?
I'm not sure why this would make you happy.

 

[DPJ]

I'm not sure why this would make you happy.

Just the stupid grin of bewilderment, John.

You and I did the figures last year and we thought it was under-reading - you were going to try one of your sensors in it to see the difference. However, it performed quite well at the Mk4vSCN Awesome RR day late last year. I have a Dastek RR day on Saturday, so I need to get it 'set up' this week with some logging and twiddling....

 

[probee]

let me know how you get on with your MAF Dave, im quite interested in all this right now... its a very nice learning curve.

When i got back to work my housing was ready for me at 70mm bore. i think we are all thinking along the same lines now, it needs to be 72mm

i did run some logs on the way home and if you were confused about this before your going to be in a mess when you see this, i have been trying to explain it but i cant come up with a logical answer.

	Group A:	'003				Group B:	'020			
		RPM	Mass Flow	Load	Ign. Timing		Idle Stabilization	Idle Stabilization	Idle Stabilization	Idle Stabilization
	TIME					TIME				
MARKER	STAMP	 /min	 g/s	%	 °BTDC	STAMP	 CF	 CF	 CF	 CF
	171.04	2160	10.33	8.6	9	171.44	0	0	0	0
	171.85	2280	29.22	16.9	30	172.25	0	0	0	0
	172.65	2440	32.64	17.3	30.8	173.05	0	0	0	0
	173.47	2640	35.42	18	30.8	173.87	0	0	0	0
	174.27	2840	27.92	16.5	34.5	174.67	0	0	0	0
	175.07	3040	36.69	18	35.3	175.47	0	0	0	0
	175.87	3240	42.36	19.2	35.3	176.28	0	0	0	0
	176.68	3440	52.86	22.4	33.8	177.08	0	0	0	0
	177.48	3800	153.11	98.8	18.8	177.88	0	0	0	0
	178.28	4440	206.03	100	9	178.68	0	0	0	0
	179.1	5040	222.17	100	11.3	179.5	0	0	0	0
	179.9	5560	236.67	100	12	180.3	0	0	0	0
	180.7	6000	245.31	99.6	10.5	181.1	0	0	0	0
	181.5	6360	254.14	100	12.8	181.92	0	0	0	0
	182.32	6680	249.58	100	12.8	182.72	0	0	0	0
	183.13	6040	6.83	20	37.5	183.52	0	0	0	0

	Group A:	'002				Group B:	'031	
		RPM	Load	Inj. On Time	Mass Flow		Lambda Factor	Lambda Factor
	TIME					TIME		
MARKER	STAMP	 /min	%	 ms	 g/s	STAMP		
	18.61	2280	44.4	4.08	22.44	18.21	1.055	0.945
	19.43	2440	74.4	6.12	38.42	19.01	0.867	0.969
	20.23	2600	71.4	5.44	37.5	19.83	0.953	0.977
	21.03	2760	89.5	6.46	47.06	20.63	0.977	0.977
	21.84	2960	95.5	7.14	55.33	21.44	0.984	0.984
	22.64	3160	96.2	7.14	59.5	22.24	1	0.984
	23.44	3400	100.8	7.48	65.94	23.04	0.992	0.984
	24.26	3800	191.7	16.66	200.83	23.84	0.821	0.984
	25.06	4400	191.7	18.02	190.31	24.66	0.906	0.891
	25.86	4960	191.7	18.02	219.22	25.46	0.867	0.86
	26.66	5400	191.7	17.34	234.72	26.26	0.836	0.86
	27.47	5880	191.7	16.66	241.53	27.07	0.836	0.86
	28.27	6200	191.7	16.66	248.33	27.87	0.875	0.86
	29.09	6520	191.7	14.62	248.61	28.67	0.852	0.86
	29.89	6360	30.1	4.42	0	29.49	0.852	0.86
	30.69	5440	191.7	19.38	240.94	30.29	0.774	0.906

Load looks much better, IDC on right

Tuesday	17	March	2009	18:11:21								
1ML 906 032 A  		1.8l R4/5VT      01 0001										
												
	Group A:	'002				Group B:	'114					
		RPM	Load	Inj. On Time	Mass Flow		Load	Load	Load	Load		IDC
	TIME					TIME						
MARKER	STAMP	 /min	%	 ms	 g/s	STAMP	%	%	%	%		
	55.13	2680	69.9	5.1	38.58	54.73	182.7	180.6	59.4	0		11.39
	55.93	2920	71.4	5.1	40.67	55.53	188	186.6	70.7	0		12.41
	56.74	3200	68.4	5.1	42.25	56.34	191.7	191	69.2	0		13.6
	57.54	3440	71.4	5.44	46.11	57.14	191.7	194	69.9	0		15.59466667
	58.34	3760	99.2	7.48	75.61	57.94	191.7	197	76.7	0		23.43733333
	59.16	4680	191.7	17	207.92	58.74	191.7	203	159.4	95.3		66.3
	59.96	5560	191.7	17.68	230.44	59.56	191.7	201.5	191.7	85.1		81.91733333
	60.76	6360	191.7	15.98	235.56	60.36	191.7	195.5	191.7	85.1		84.694
	61.57	6840	154.9	10.88	138.75	61.16	191.7	191	185	84.3		62.016
	62.37	4920	103	9.52	127.94	61.97	191.7	192.5	12	0		39.032
												0
	106.62	2720	60.9	4.76	33.42	106.22	185.7	183.6	60.2	0		10.78933333
	107.42	2800	62.4	4.76	34.28	107.02	187.2	185.1	61.7	0		11.10666667
	108.24	2920	74.4	5.78	43.78	107.82	190.2	188.1	64.7	0		14.06466667
	109.04	3080	81.2	6.46	50.03	108.64	191.7	191	75.2	0		16.58066667
	109.84	3240	82.7	6.12	51.83	109.44	191.7	192.5	81.2	0		16.524
	110.64	3400	92.5	6.8	61.19	110.24	191.7	194	87.2	0		19.26666667
	111.45	3680	163.2	13.6	152.58	111.05	191.7	197	110.5	20.8		41.70666667
	112.25	4240	191.7	19.04	184.92	111.85	191.7	201.5	191.7	82		67.27466667
	113.05	4760	191.7	18.36	201.89	112.65	191.7	203	191.7	82		72.828
	113.87	5320	191.7	18.02	225.42	113.45	191.7	203	191.7	83.5		79.88866667
	114.67	5760	191.7	17	228.67	114.27	191.7	200	191.7	83.9		81.6
	115.47	6120	191.7	16.32	233.75	115.07	191.7	197	191.7	83.5		83.232
	116.27	6440	191.7	15.64	233	115.87	191.7	192.5	191.7	81.6		83.93466667
	117.08	6720	177.4	14.28	238.25	116.68	191.7	191	186.5	82.4		79.968
	117.9	6520	12.8	1.36	0	117.48	191.7	191	191.7	77.3		7.389333333
	118.68	5080	14.3	0	11.64	118.28	191.7	197	14.3	0		0

i still dont want to go straight to 72mm.... tomorrow i will take 1mm out

 

[DPJ]

Initial reaction......... WTF!

Goes back to look harder..

Edit: No, I can't explain that......
Is the excitement getting too much for that sensor? When could you repeat that with Nick's sensor in the tube?

 

[probee]

im glad you had the same reaction that i had

 

[probee]

Initial reaction......... WTF!

Goes back to look harder..

Edit: No, I can't explain that......
Is the excitement getting too much for that sensor? When could you repeat that with Nick's sensor in the tube?

im not sure, ill give Nick a ring to find out, im sure it will be the weekend. it would be good to get a comparison but i would also like to get the housing bored while we are not too busy at work. if i miss an opertunity it will be the start of next month before he can do it again.

..... it does feel very fast like it is though, lets hope it gets better , i was going to push the timing more with unisettings but i will wait until im happy with the MAF

 

[jonjay]

Does it feel faster than before in general Aaron?

 

[probee]

Does it feel faster than before in general Aaron?

its very hard to say Maz, its just like it was before on a good day (it wasnt slow before )




Dave, Nick isnt around this until next week i think ill have to take the plunge.

 

[DPJ]

72mm looks about spot on mate. Odd that some tt's and cupra r's came with different sized mafs.
I've bought quite a few tt 225 mafs over the years, and they've all been 69.6mm

Do you think it's just the tubes that are different, or different sensors too, John?

its very hard to say Maz, its just like it was before on a good day (it wasnt slow before )

Dave, Nick isnt around this until next week i think ill have to take the plunge.

Fair enough. I've just re-read it all again for the nth time.

60 to 100 logging 066 is always a good reality check. It gets hard to tell what feels right, doesn't it - until you get it right - and then wow....

 

[Damoegan]

60 to 100 logging 066 is always a good reality check. It gets hard to tell what feels right, doesn't it - until you get it right - and then wow....

Does 066 log actual speed, Dave?

 

[DPJ]

Does 066 log actual speed, Dave?

Yes. It'll get slewed by any wheelspin of course.

 

[Damoegan]

Yes. It'll get slewed by any wheelspin of course.

Cool. Might have to try that one sometime

 

[probee]

Yes. It'll get slewed by any wheelspin of course.

id love some wheelspin at 60. do you manage that? i sometimes get it spinning in 4th on a wet day.

theres just the right amount of convenient layby's on the way home for the amount of logs to run.... i think i need to find another to get 66 in

EDIT: those logs are making good reading arent they Dave? i wish i could come up with an explanation.... i even stopped turned off and did another TBA and fault code reset to be sure.

2nd EDIT: Nick said he would post that MAF number tonight.

 

[DPJ]

id love some wheelspin at 60. do you manage that? i sometimes get it spinning in 4th on a wet day.

theres just the right amount of convenient layby's on the way home for the amount of logs to run.... i think i need to find another to get 66 in

EDIT: those logs are making good reading arent they Dave? i wish i could come up with an explanation.... i even stopped turned off and did another TBA and fault code reset to be sure.

If it wasn't for all your other logs, you'd look at that one in isolation and think "wow". I don't get it as everything else looks spot on. I've thought of two or three things, but they don't hold water in light of other evidence.

3rd is always hairy with mine at any speed.

If logging is a chore sometimes, consider logging 066 as your treat, simple and fun.

 

[probee]

If it wasn't for all your other logs, you'd look at that one in isolation and think "wow". I don't get it as everything else looks spot on. I've thought of two or three things, but they don't hold water in light of other evidence.

3rd is always hairy with mine at any speed.

If logging is a chore sometimes, consider logging 066 as your treat, simple and fun.

if it wasnt for the MAF reading id be happy enough with those logs to call it a day and start playing with the wmi, @ 71mm im fairly sure we will start to see normalish figures

Reading your thread does make me want to go BT. TBH i think a hybrid would do me perfectly. i havent seen many good results from a hybrid but set up correctly im sure i could get a reliable 300bhp from one and a little more torque than i have now.

the only problem with treating yourself to a 66 is the rat race to work
i can go in at 6 though


i wonder if John will be as confused as us

 

[DPJ]

......i wonder if John will be as confused as us

Probably not...........