N75 Valve question..

[flashbsd]

ok i swapped my valve for somebody elses, and seems to make a difference.

Mine is still hesitating etc..

I have a "C" Valve, Mikes was an "F". Immediatly boosted to 7 not 6psi as before on stock. and currently i do see the boost gauge jumps slightly when at full boost, and also goes to 4, then jumps the rest of the way after a little hesitation.

WHich valve should be on the car? , C or F or J? it feels slow slow, im quite annoyed.

 

[Martyn]

C is standard on an Ibiza Cupra mate.

 

[flashbsd]

Thanks Martyn.
This is my vag-com log of a stock ECU, surely i should be seeing more torque than that? Temps look good, maf seems good for a stock car, what you think to the n75 duty anybody? 3rd and 4th gear pull

MARKER	STAMP	 /min	%	 ms	 g/s	STAMP	 /min	 Nm	 Nm		STAMP	 /min	°C	%	 mbar
	0.3	1720	34.6	3.69	11.5	0.7	1760	399.8	47	ASR OFF	1	1800	30	0	1000
	1.31	1800	36.8	4.1	12.97	1.6	1840	399.8	47	ASR OFF	1.9	1880	30	0	1000
	2.2	1920	72.9	8.61	29.47	2.5	2000	399.8	133.3	ASR OFF	2.8	2080	29	64.3	1190
	3.1	2120	96.2	11.89	42.53	3.39	2240	399.8	176.4	ASR OFF	3.69	2320	27	48.2	1420
	3.99	2400	106	13.12	49.44	4.29	2520	399.8	188.2	ASR OFF	4.59	2600	26	38.8	1420
	4.89	2680	102.3	12.3	53.81	5.29	2840	399.8	188.2	ASR OFF	5.6	2920	26	42.4	1440
	5.89	3000	109.8	13.53	65.25	6.19	3120	399.8	198	ASR OFF	6.49	3200	26	49	1460
	6.79	3320	112	13.94	70.69	7.1	3400	399.8	196	ASR OFF	7.39	3480	26	45.1	1460
	7.7	3600	109.8	13.53	76.47	8	3680	399.8	194	ASR OFF	8.29	3800	27	46.3	1450
	8.6	3880	111.3	13.94	83.25	8.9	3960	399.8	199.9	ASR OFF	9.2	4080	27	49	1450
	9.49	4160	113.5	14.35	90.64	9.8	4240	399.8	198	ASR OFF	10.1	4360	28	52.5	1460
	10.4	4440	117.3	15.17	100.28	10.7	4520	399.8	203.8	ASR OFF	11	4640	29	53.7	1450
	11.3	4720	118	15.58	106.39	11.6	4800	399.8	201.9	ASR OFF	11.9	4880	30	54.9	1440
	12.2	5000	117.3	15.99	111.25	12.5	5080	399.8	199.9	ASR OFF	12.8	5160	32	56.1	1440
	13.1	5240	115	16.81	115.47	13.4	5320	399.8	188.2	ASR OFF	13.7	5400	33	57.3	1450
	14	5480	112.8	17.22	118.53	14.3	5520	399.8	174.4	ASR OFF	14.6	5200	34	0	1450
	14.9	4640	12	1.64	13.36	15.2	4360	399.8	174.4	ASR OFF	15.5	4400	33	51	1370
	15.8	4440	115.8	15.99	103.47	16.1	4520	399.8	198	ASR OFF	16.4	4520	34	53.3	1450
	16.7	4560	117.3	15.99	104.61	17	4640	399.8	198	ASR OFF	17.3	4680	34	53.7	1450
	17.6	4720	116.5	15.99	106.53	17.9	4760	399.8	203.8	ASR OFF	18.2	4800	35	54.5	1440
	18.5	4840	116.5	15.99	108.81	18.8	4880	399.8	203.8	ASR OFF	19.1	4920	36	55.3	1450
	19.4	4960	116.5	15.99	111.11	19.7	5000	399.8	203.8	ASR OFF	20	5040	36	55.7	1440
	20.3	5080	115.8	16.4	112.31	20.6	5120	399.8	198	ASR OFF	21	5160	36	56.5	1450
	21.3	5200	115.8	16.81	114.61	21.59	5200	399.8	192.1	ASR OFF	21.89	5280	37	57.3	1460
	22.19	5280	114.3	16.81	116.5	22.49	5320	399.8	184.2	ASR OFF	22.79	5360	37	58	1460
	23.09	5360	113.5	17.63	117.5	23.39	5400	399.8	178.4	ASR OFF	23.69	5440	38	58.8	1460
	23.99	5440	23.3	2.05	10.19	24.29	5360	399.8	0	ASR OFF	24.59	5320	36	0	1090
	24.89	5280	10.5	0	10.5	25.19	5240	399.8	0	ASR OFF	25.49	5160	36	0	1040
	25.89	5080	9.8	0	9.67	26.18	5040	399.8	0	ASR OFF	26.49	5000	36	0	1040

 

[flashbsd]

anybody got a stock ibiza to compare n75 duty/MAF/Torque with?

 

[Molehill_Mike]

So my N75F is incorrect? Weird? Must of been like that for a while? I bought the car from a dealer (not from new)...

On FlashBSD's it definately felt quick, even standard?

Flash we should of tried your N75 on mine, see what happens? Can do that Weds if ya like?

Seems odd a C would be standard? Not disagreeing, just saying when mine was RR and it had the F on it, it gave usual figures? (155bhp and 167lb/ft).

Can anyone explain in simple terms the difference between an N75C and an N75F? Flash and I have our own views on it, but would be interested to hear others?

Ta,


Mike

 

[RALF]

Originally they came with a c valve, it then changed to an f for some reason. Mine run's an f.

 

[Martyn]

The only reason it would of been changed to an 'F' is if somebody put it on there either due to an error or because they wanted to 'try' and make the car faster.

 

[Molehill_Mike]

Oooh mixed views....

I won't be changin mine to a C thats for sure.. lol

Mike

 

[LeeroyBrown]

Iv got a C on mine and everything seems to be perfectly fine

 

[Molehill_Mike]

Leeroy, would be interesting to see (if you could) you swap your N75C for someone with an F, see if you feel any difference, it was definately better on Flash's. IF what RALF says is true, it could of been an update? Strange though as yours I see is a 51 plate? Unless its been replaced in the past?

On weds, we are gonna swap them over and do a log on mine with a C valve and a log with my F valve.

Will feed back results, but would be interested on more opinions from you chaps..

Mike

 

[RALF]

How old is flash's car, i presume his is the one with a C valve on it. Mine's a late 2001.

 

[Martyn]

Mines an 02 plate....guess which valve it came with

Do a search and you'll find plenty of info about swapping them and what the different versions do/do not do

Make sure you disconnect the battery for 10 mins before doing the run and then do the same again before you swap the valves over for the second run.

 

[Molehill_Mike]

Both mine and Flash's are X plates.

I am wondering if mine has been replaced in the past, and they replaced it with an F..

Mike

 

[RALF]

Well im pretty sure mine has never been changed, not by me anyway . I tryed a J for a while but took it off

 

[Molehill_Mike]

Well we will see the difference when we log on wednesday, but from today I would say the F is the way forward...

Mike

 

[Martyn]

Mike, just so you are aware the Revo map you have on your car was specifically designed to work with the 'standard' N75 'C' not the 'F' valve.

 

[Molehill_Mike]

Oh right... well it seems OK, havent had any problems?

Cheers tho!

Mike

 

[Martyn]

Thats the magic of the 20VT bud, lots of people run different N75s with good effect, others just end up in limp mode. Fecking ECU is too clever for its own good

 

[claudefrog]

my car is an 02 and came with a C

however the car runs a lot better on the F

so i prefer the F, have both tho incase I need to change

 

[CupraUK]

As we are local Mike, feel free to borrow my J if you want to experiment.