Boost, actual higher than requested!

[Gubien]

Hi!

I have an appointment at Seat to solve my boost problem!
But, I'm curious about what could cause that behavior!

What could cause this odd behavior? When boosting, the actual is 0,7bar but only requesting 0,5 bar over the whole range!

I measured the N249 and N75 valve, I they should be ok according to elsawin.

Standard MAP

 

[Cupra Ross]

Hi!

I have an appointment at Seat to solve my boost problem!
But, I'm curious about what could cause that behavior!

What could cause this odd behavior? When boosting, the actual is 0,7bar but only requesting 0,5 bar over the whole range!

I measured the N249 and N75 valve, I they should be ok according to elsawin.

Standard MAP

Sounds like a dead N75 or an out of spec MAP sensor to me.

 

[Gubien]

I've measured the N75 and it should be fine (electrical) according to elsawin.

What do you mean by "out of spec"? And do you mean the sensor close to the intercooler?

 

[Cupra Ross]

The Manifold Absolute Pressure sensor which measures actual boost. It could be over-reading.

 

[DannyC87]

yep the map is the one near the intercooler. Check the hoses to and from the n75 - these were the cause of my overboosting problems..split!

 

[Gubien]

The funny thing is though, that the difference with a revo map is like 0.05 bar.

Group A:	'020				Group B:	'115				Group C:	'003			
	Idle Stabilization	Idle Stabilization	Idle Stabilization	Idle Stabilization		RPM	Load	Absolute Pres,	Absolute Pres,		RPM	Mass Flow	Load	Ign, Timing
TIME					TIME					TIME				
STAMP	 CF	 CF	 CF	 CF	STAMP	 /min	%	 mbar	 mbar	STAMP	 /min	 g/s	%	 °BTDC
134,3	0	3	0	0	134,92	2520	55,6	1000	1110	133,75	2440	16,53	12,9	32,3
136,22	0	3	0	0	136,89	2680	48,9	1000	1130	135,58	2560	25,67	15,7	32,3
138,23	0	0	0	0	138,89	2880	48,9	1000	1140	137,53	2760	26,17	15,7	33
140,11	0	3	3	3	140,69	3240	157,1	2230	2050	139,55	2920	27,72	16,5	33,8
141,8	6	6	3	3	142,36	3920	178,9	2350	2300	141,25	3480	117,08	100	4,5
143,62	3,8	3,8	3,8	0	144,25	4680	183,5	2310	2400	142,98	4200	144	100	12
145,56	3	3	3	3	146,28	5400	181,2	2270	2250	144,86	4920	170,61	100	6,8
147,61	2,3	5,3	2,3	2,3	148,26	6000	167,7	2190	2140	146,97	5640	189,69	100	9,8
149,59	1,5	4,5	1,5	5,3	150,22	6360	135,3	1000	1890	148,92	6160	192,44	99,6	9,8

 

[Cupra Ross]

Is that log from the Revo map? Looks ok to me. Possibly a little down on power for a revo map, looks like about 245bhp.

 

[Gubien]

Yes it is, but it knocks like crazy when having in mind I run 99 vpower. And it pulls back the ignition quite much!

Previous remap from denmark made 243/343nm, so something MUST berong!(It boosted at 1,55bar)

 

[Gubien]

I think I have found the leak! But need it on a lift to make the job easier!

www.espeloev.dk/video/17052009034.mp4