N75, Boost and MAF "Bouncy"

[Feel]

I spotted that my N75 is "bouncy", it practically sits at 100%, but goes;

100,100,96,100,99,100,100,94,100 etc. I'll post some logs later.

I bunged a new N75 on it the other day (didn't do a TBA or whip the battery off though) and checked the pipes as best I could - charge pipe to N75 visually, N75 to wastegate seems to hold a vacuum okay (technical way of saying I sucked on it and put my tongue over the end and it didn't release )

The MAF and boost seem to be just as bouncy, but I can't feel it though.

Any ideas?

 

[Feel]

Hmmm, just tried a TBA and it's come up with "ERROR" rather than "ADP RUN", battery's off at the minute.

 

[Martyn]

Phil, that's because the coolant temp is probably too low, leave it till lunchtime and try it again.

 

[Feel]

Ahhhh, yes - there's temp range isn't there.

Edit: 5ºC to 95ºC

 

[Feel]

Put the battery back on to check outside temp, 8.5ºC, coolant temp is -1ºC, IAT 12ºC

Bonnet up TBA Ran - beeeeeeep click.

After reconnecting the battery and found a "17987 Throttle Actuator (J338): Adaption Not Started P1579" - I can't clear this code and I can't run a TBA, still getting "ERROR".

??

 

[Feel]

All the clues were there Warmed the car up for a couple of minutes until the coolant temp was 10ºC, cleared the fault code and ran the TBA

I did clean the TB first though

 

[Martyn]

Bless, the cold must be getting to ya

 

[Feel]

I was ignoring the coolant temp and looking at the outside temp thinking - "must be warm enough now..."

I've only ever done it when the car's been cold - i.e. overnight. Kind of got stuck in my ways

Anyway, bouncy N75 seems to have gone - only come back from swimming with the kids and it seems better.

 

[DPJ]

Anyway, bouncy N75 seems to have gone - only come back from swimming with the kids and it seems better.

Your N75 takes the kids swimming? I can't even get mine to look after them for 5 minutes.

 

[Feel]

Try tweaking your settings with an SPS3

 

[DPJ]

Try tweaking your settings with an SPS3

If only..........

 

[Feel]

This morning's log

1		1ML906032   		1.8l R4/5VT      01 0001	
06/11/2006	08:29				
                                                                					
	Group A:	'118			
		RPM	Temperature	Load	Pressure
	TSTAMP	RPM	°C	%	mbar
	24.93	2720	13	100	1030
	25.34	2760	14	100	1240
	25.75	2840	14	100	1510
	26.13	2960	14	100	1870
	26.62	3120	15	85.1	2410
	26.98	3280	15	88.6	2540
	27.35	3440	15	88.6	2540
	27.75	3560	15	89	2540
	28.13	3760	15	89.8	2540
	28.55	3920	15	91	2500
	28.98	4080	15	91.4	2460
	29.34	4240	16	91.4	2430
	29.78	4400	17	96.9	2350
	30.16	4520	18	97.3	2310
	30.61	4680	18	97.3	2280
	30.95	4840	18	97.6	2250
	31.37	4960	19	97.6	2200
	31.77	5120	20	97.6	2200
	32.18	5240	20	96.9	2200
	32.57	5360	21	99.2	2190
	32.98	5480	21	100	2210
	33.38	5600	21	100	2160
	33.8	5720	23	100	2150
	34.18	5800	23	100	2150
	34.62	5880	24	100	2090
	35	6000	24	96.1	2070
	35.39	6080	25	99.6	2080
	35.81	6200	26	100	2110
	36.21	6280	27	99.6	2090
	36.63	6360	27	100	2110
	37.01	6440	27	98.4	2080
	37.41	6520	29	94.9	2070
	37.8	6560	29	100	2040

Still a bit bouncy at the top end, or am I worrying about nothing?

 

[Martyn]

Phil, it's probably a bit bouncy because of the cold weather, run it for another 100 miles then log again.

 

[Feel]

I'm falling for all the noob mistakes aren't I...

 

[Martyn]

Next you'll be asking if you can fit a wooshy dump valve or a decat pipe

 

[Feel]

Really? Could you tell me what the difference is, without me bothering to search first?

I was comparing that log with a log I have from almost exactly one year ago - trouble is can't remember if the car was running well then or not.

My advice to everyone would be keep all your old logs (even the rubbish ones) but keep them named or filed in such a way you can remember what they were. Again, perhaps a bit of a noob revelation, but only once you've tried to look back and compare some old logs...