Surge on Stage 1 K04 - Cured

[JamJay]

New MAF Fitted, Problem Persists

You guessed, I still have surge after a new MAF.

Latest logs...

	Group A:	'002			
		RPM	Load	Inj. On Time	Mass Flow
	TIME				
Marker	STAMP	 /min	%	 ms	 g/s
	0.36	2600	52.6	4.76	28.14
	0.78	2600	55.6	5.78	31.53
	1.27	2640	59.4	5.44	31.61
	1.67	2680	82	8.16	49.33
	2.07	2720	124.1	12.92	80.11
	2.49	2840	163.2	15.98	109.56
	2.98	3000	191.7	20.4	163.06
	3.48	3240	191.7	23.12	173.67
	3.89	3360	191.7	24.48	181.53
	4.39	3600	191.7	24.82	186.06
	4.89	3800	191.7	25.16	192.06
	5.3	4000	191.7	24.48	196.06
	5.7	4160	191.7	24.48	197.44
	6.2	4320	191.7	23.46	194.5
	6.6	4440	191.7	22.44	197.89
	7	4560	191.7	21.76	187.5
	7.42	4680	191.7	20.4	189.67
	7.91	4840	191.7	21.42	190.31
	8.31	4920	191.7	22.44	186.75
	8.82	5040	191.7	23.46	196
	9.32	5200	191.7	23.12	199.69
	9.72	5280	191.7	22.78	205.69
	10.23	5400	191.7	20.74	208.72
	10.63	5520	191.7	20.4	208.19
	11.03	5560	191.7	20.06	210.89
	11.43	5680	191.7	19.72	214.97
	11.83	5760	191.7	21.08	217.03
	12.23	5840	191	21.08	213.97
	12.63	5920	191.7	22.1	216
	13.05	6000	189.5	22.78	214.28
	13.54	6080	189.5	24.48	216.36
	13.94	6120	180.5	24.14	213.81
	14.45	6240	176.7	23.46	217.64
	14.85	6280	183.5	24.48	216.78
	15.25	6360	175.9	23.12	217.72
	15.65	6440	176.7	23.46	218.94
	16.07	6520	177.4	23.46	220.14
	16.57	6560	175.2	23.12	220.25
	16.97	6640	175.2	23.46	225.78
	17.37	6680	172.2	22.78	224.19
	17.77	6720	172.2	23.46	224.72
	18.17	6800	176.7	24.82	223.33
	18.57	6840	176.7	26.18	223.33
	18.98	6880	172.9	26.52	222
	19.48	6960	153.4	24.48	224.39

Peak g/s since new MAF is almost 226g/s so the old one was faulty but hasn't cured my surge

So that's 225.78/0.8 = 282.2bhp or 225.78 x 1.275 = 287.87bhp...ON A STAGE 1?

So what you you reckon, N75 valve? When driving and before boost kicks in, the car somestimes gets a kick or stutter. I've also noticed that it hesitates on boost, feels like hitting a wall a bit and then boost is allowed back.

I've taken the air filter away from the air feed just to see if all that air hitting it was doing this but I still get the surge.

Please help!

 

[t0m]

Sorry to see it hasn't sorted your issue Jay

Can I just ask how you do those logs on vagcom? Did you do them yourself or with a passenger? What revs to redline etc did you log?

I need to start doing this so I can get some g/s figures for mine.

Have you looked into how much N75 valves are? Maybe yours is faulty?! Or would this flag on vagcom? I'm no expert sorry. But surely worth a try.

 

[ibizacupra]

boost gauge to see what its doing..
>2550mb on vagcom yea?

N75 next thing to check out...

 

[sambryant]

nice figures m8. as long as the car is turning the gs into power then yes this could be your power

 

[sambryant]

bill do you think a mbc is the way forward for jamjay as it looks like hes having the same surge issue i had

 

[JamJay]

Sorry to see it hasn't sorted your issue Jay

Can I just ask how you do those logs on vagcom? Did you do them yourself or with a passenger? What revs to redline etc did you log?

I need to start doing this so I can get some g/s figures for mine.

Have you looked into how much N75 valves are? Maybe yours is faulty?! Or would this flag on vagcom? I'm no expert sorry. But surely worth a try.

Block 002 for airflow Tom. I do it myself normally, just try to be safe and line up the mouse pointer on the start button before you set off, then when in the right gear & revs, hit the left click on the mouse/laptop and start the log. I do the runs in 4th where the road and conditions permit, latest logs were oin 4th but 3rd gear works too if you have less road.

boost gauge to see what its doing..
>2550mb on vagcom yea?

N75 next thing to check out...

Can't check boost in VCDS as it's freeware, boost guage sitting here waiting for installation, hopefully on the weekend. I assume boost is huge though .

Looking across U.S forums, looks like N75 causes the issues I have so will change that for a new OE one (F rev?) ASAP. Pleas God let that be the issue and then done.

nice figures m8. as long as the car is turning the gs into power then yes this could be your power

Nice indeed, without FMIC and Stage 2 code too but I suspect this is because it's overboosting.

bill do you think a mbc is the way forward for jamjay as it looks like hes having the same surge issue i had

Interested to hear more however there are loads of us with the same setups now and they don't get this issue.

 

[t0m]

Cheers for the info Jay. I've asked Sam about doing the logs too, so I should be clear to try it out soon

I want to tonight but things to do and 35 miles of v-power left in the tank only...

 

[ibizacupra]

mbc will cap its overboost, which still needs to be confirmed asap... in case its in bendy rod territory.
n75 has fixed some peeps cars, but not everyones..

as we did with Sams, I used an unos in parallel with his n75 to cap the spike, which worked well on his (and a few others which have been suffering muchos spikes - all K04 cars )

 

[paul26982]

i have all these problems too in my Cupra' had them for months, heads done in, onto my 3rd Genuine Bosch MAF as i thought they were all faulty but the current one' the code has changed to High MAF readings

also running a 007p with green spring on the current mods

3" DP
Decat
MAP
JR Jetex
Heatshield
Forge 007p

feel like crying, mines at 3k REVS to 3,5 around 80MPH

 

[jonathan_phang]

Can I just ask how you do those logs on vagcom? Did you do them yourself or with a passenger? What revs to redline etc did you log?

I believe its a 4th gear WOT run, from about 2.5k to redline. However, that will take you north of 3 figures so you can use third instead. Its better to have a passenger so that you can concentrate on the driving, but up to you really.

I'm presuming you know what blocks to log but if not then this link should help to explain what is logged in each.

Hope that helps
JP

 

[cupra_r_ick]

it sounds like you had the same issues as me. mine was overboosting like a mother, that was fault of the SHITE turbo. then when i had old one back on, then it was not overboosting but spikey just like your describing. would boost then feel like hit a wall etc, is/was the n75....

 

[t0m]

I believe its a 4th gear WOT run, from about 2.5k to redline. However, that will take you north of 3 figures so you can use third instead. Its better to have a passenger so that you can concentrate on the driving, but up to you really.

I'm presuming you know what blocks to log but if not then this link should help to explain what is logged in each.

Hope that helps
JP

Nice one Jonathan

Just found it, and it's definitely block 002 to log for airflow (g/s).
http://www.ross-tech.com/vag-com/m_blocks/001-009.html

I will used 3rd gear for runs until I find some private land
Will probably leave it until I can get a mate to come along as a passenger so I can focus on my great driving skills

 

[RS6]

T0m you got registered vag-com lite? can't do logs on mine yet

 

[JamJay]

I'm so hoping that this is N75. A little annoyed that the MAF didn't do it but clearley it was an issues as it went from 206g/s to 226g/s.

 

[RS6]

gotta love the 1.8t try this, then this then gotta be this.. rolls eyes

 

[t0m]

T0m you got registered vag-com lite? can't do logs on mine yet

I have the full version mate, not no light version where you can't change anything.

 

[t0m]

gotta love the 1.8t try this, then this then gotta be this.. rolls eyes

Yep, gotta love 1.8 T ownership!!

 

[rsmith]

mbc will cap its overboost, which still needs to be confirmed asap... in case its in bendy rod territory.
n75 has fixed some peeps cars, but not everyones..

as we did with Sams, I used an unos in parallel with his n75 to cap the spike, which worked well on his (and a few others which have been suffering muchos spikes - all K04 cars )

What was Sam's boost capped at, i heard 1.4bar!

 

[sambryant]

yes 1.4 m8

 

[JamJay]

I think that I'm going to plumb the boost guage this Saturday but not electrically wire it, i'll still get a readout won't I?

This will be my last run on full boost with this issue, I'm getting scared now