It did'nt do this on 1st fitment but now chuff's, Is that right?
MAF sensor ok? Its reading lower now for some reason...
if the maf's under reading, the requested boost may well be higher than before on initial spool...
-
Welcome to our new sponsor Lecatona, a brand dedicated to enhancing performance for VAG group sports cars, including SEAT, Audi, Volkswagen and Škoda. Specializing in High Pressure Fuel Pump (HPFP) upgrades.
Surge on Stage 1 K04 - Cured
- Thread starter JamJay
- Start date
It did'nt do this on 1st fitment but now chuff's, Is that right?
MAF sensor ok? Its reading lower now for some reason...
if the maf's under reading, the requested boost may well be higher than before on initial spool...
Yeah that's right, the car has suddenly decided that it is going to get upset with the extra airflow.
MAF sensor looks ok, no damage but then who knows if the internals are dying due to age (original MAF). Good to know that if the MAF starts to die that requested boost could be higher, another explanation that means I can fix myself, I will see if I can source a replacement MAF ASAP.
MAF sensor looks ok, no damage but then who knows if the internals are dying due to age (original MAF). Good to know that if the MAF starts to die that requested boost could be higher, another explanation that means I can fix myself, I will see if I can source a replacement MAF ASAP.
Well I just refitted the OE DV and took her out. The car dumps a lot easier under low boost but the surge is still there under WOT 
.
So next step...new MAF?
.So next step...new MAF?
FFs, MAf "looks" ok?
what does a non ok maf look like then?
visibly you wont see a thing!
your airflow has Dropped!
thats a big clue...
the load request is now HIGHER to meet the request, from a lower than should be MAF reading... is my best guess
MAF MAF MAF 1st port of call
I see your point, yes they all look the same
. My latest logs are as per post #1, I wasn't able to get any after the TIP was first fitted due to laptop issues. As my last laptop died, I can only find one set of logs, however this was block 003 but is shows airflow although this wasn't my highest reading. This was Stage 1, THS TIP & Cone directly on MAF.
Code:
Group A: '003
RPM Mass Flow Load Ign. Timing
TIME
STAMP /min g/s % °BTDC
0.4 2880 69.14 80.4 24
1.61 3480 144.03 100 0.8
2.81 4160 156.83 100 8.3
4.13 4920 177.33 100 7.5
5.34 5480 191.31 100 10.5
6.75 6080 197.72 100 12.8
7.97 6480 199.72 99.6 13.5
9.26 6880 197.31 100 13.5
10.46 7080 201.36 43.1 3
11.68 5360 16.19 10.2 4.5
12.97 5040 59.97 27.8 3
14.29 5240 170.33 41.2 14.3
15.5 5080 10.22 7.8 6
16.91 4880 11.33 7.8 4.5Latest logs on 002:
Code:
Group A: '002
RPM Load Inj. On Time Mass Flow
TIME
STAMP /min % ms g/s
5.63 3840 191.7 23.12 158.61
6.03 4000 191.7 22.44 159.06
6.43 4120 191.7 21.42 157.39
6.84 4280 191.7 20.74 160.39
7.25 4440 191.7 20.4 165.94
7.65 4600 191.7 20.06 168.75
8.05 4720 191.7 20.06 170.39
8.45 4880 187.2 19.72 176.36
8.85 5040 185.7 19.38 178.5
9.26 5160 185.7 19.04 185.97
9.66 5280 185.7 19.38 188.14
10.06 5400 191.7 20.06 192.36
10.46 5520 185 19.38 192.14
10.86 5640 178.2 19.04 191.86
11.26 5760 181.2 19.72 193.08
11.66 5840 178.9 19.72 194.33
12.08 5920 178.9 19.72 195.25
12.57 6040 173.7 20.06 201.67
12.97 6120 178.2 21.08 198.11
13.48 6280 173.7 20.4 198.11
13.88 6360 163.2 19.38 201.36
14.28 6440 163.9 19.38 202.33
14.68 6520 160.2 19.04 200.06
15.08 6560 160.2 18.7 202
15.5 6640 166.2 20.06 197.72
15.9 6720 158.6 19.04 199.72
16.3 6800 144.4 17.34 198.11
16.81 6880 156.4 19.38 202
17.29 6960 148.1 18.7 206.25Again Bill, apologies for tapping your brain on this but like I say I'm just your average enthusiast learning as I go.
I just refitted the TIP and everything is fine there, I can rule this out too so yes, MAF it is. I have also notice a stutter and hesitance just before boost (2500rpm) which would also indicate MAF as per people's decriptions, then boost returns and chuff chuff chuff. If I accelerate hard from 1st, 2nd and into 3rd, no surge at all, hard from 3rd, 4th, 5th and 6th and I get it.
If I plant my foot down and WOT from 2000rpm, the 'flutter' sound starts from full boost at 2500rpm.
Would unplugging the MAF and going for a 'hard' drive work in this case or is it best to just replace old for new?
Fitted by myself, twice now.
MAF on order.
Last edited:
well if a garage has fitted it they might have rushed it and something might not be done up tight enough or fitted wrong
I feel some of you are on the wrong track here and looking for solutions to problems that dont exist. I'm currently running a 90mm tip on my LCR with zero problems and have run a 3 inch tip with my car at various states of tune for several years with zero problems.
My sole aim of tuning my car is to throw as much air as possible into my engine so that my adequately sized injectors and intelligent ecu converts it to power, ive never had a minute's problem with this. Don't try to understand issues that don't exist, more air in is placing less strain on the turbo and making for a more efficient set up. The tip is not the issue here...... honest?
My sole aim of tuning my car is to throw as much air as possible into my engine so that my adequately sized injectors and intelligent ecu converts it to power, ive never had a minute's problem with this. Don't try to understand issues that don't exist, more air in is placing less strain on the turbo and making for a more efficient set up. The tip is not the issue here...... honest?
I agree Willy, the TIP isn't the issue here at all and is probably the best mod I've added so far. The issue here is the fact that I've pushed my car harder with it and it's unearthed an issue with a weak part in the setup, the MAF. This isn't the fault of the TIP or myself, it's just the way it goes when tuning a car, especially one with weak spots like MAF, coilpacks etc. This is just my car, as ten's of others have seen, they are having no issues at all. There were a few things that it could have been and I've ruled the simple stuff out by fiddling around with things I already have, unfortunately I do not have a spare MAF to hand to that will have to wait for a day or so. I've been researching info on the MAF now as I didn't know much about its function but it has a huge part to play on these engines and will happily defunk many things when it goes wrong.
Edit: I will update when I've fitted a new one
Edit: I will update when I've fitted a new one
Last edited:
It won't work in this case is it's not an idling issue I have or low boost issue. I unplugged the MAF last night while refitting the TIP which may have brought on this error, most likely it has but can't rule out that it wasn't the surge either:
VCDS-Lite Version: Release 1.1
Tuesday, 22 March 2011, 15:34:09.
Control Module Part Number: 1ML 906 032
Component and/or Version: 1.8l R4/5VT 0001
Software Coding: 10510
Work Shop Code: WSC 79672
VCID: FE8FFDFBE9F9
1 Fault Found:
16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-10 - - - Intermittent
New MAF on order and will be with me tomorrow.
VCDS-Lite Version: Release 1.1
Tuesday, 22 March 2011, 15:34:09.
Control Module Part Number: 1ML 906 032
Component and/or Version: 1.8l R4/5VT 0001
Software Coding: 10510
Work Shop Code: WSC 79672
VCID: FE8FFDFBE9F9
1 Fault Found:
16486 - Mass Air Flow Sensor (G70): Signal too Low
P0102 - 35-10 - - - Intermittent
New MAF on order and will be with me tomorrow.
Last edited:
Yes thats the error you get when you disconnect your MAF.
Did you buy a new MAF(with housing) outright or do they do the exchange scheme in the UK, whereby you have to give them your old MAF?
Did you buy a new MAF(with housing) outright or do they do the exchange scheme in the UK, whereby you have to give them your old MAF?
No but the issue you have is the turbo being asked to work harder than it needs to as the airflow is being reported as lower than it actually is.
Bill mentioned it last night, the MAF is reading low, so the ECU is increasing the requested boost to try to pull up the g/s (actual airflow). The turbo is now pushing out more air than the engine can consume at low revs, and this charge air is oscillating in the boost pipes back to the turbo, giving the chopping noise.
Have you logged the boost pressure when its surging?
I've bought one, it's going to be delivered tomorrow morning and I'll fit it tomorrow evening. I've bought a replacement Bosch one, complete with housing but in return and to avoid a £30 surcharge I need to hand over the MAF on my car now.
No but the issue you have is the turbo being asked to work harder than it needs to as the airflow is being reported as lower than it actually is.
Bill mentioned it last night, the MAF is reading low, so the ECU is increasing the requested boost to try to pull up the g/s (actual airflow). The turbo is now pushing out more air than the engine can consume at low revs, and this charge air is oscillating in the boost pipes back to the turbo, giving the chopping noise.
Have you logged the boost pressure when its surging?
Yeah that's what Bill's said so it's clear in my head and makes perfect sense to me even from an unskilled POV in these matters.
I can't log boost pressue as I am using VCDS Lite however VCDS/the car will only read up to about 25psi so if I am boosting more than this it won't register so I've just bought this...
Now I need to know how to fit it. Nomad Pillar won't be here until next week so I'll have to hang it out of the dash for the time being.
Hi ya mate, just to definitely rule it out did you do a leak test on the 007 just to make sure it is working as it should?
Have a look at the last page of this document.
http://www.forgemotorsport.co.uk/valve_service.pdf
Hope you get this sorted mate.
Hi mate,
Yeah I leak tested the 007, looks like it needs a service but I'm running the OE DV again now which does work so that's all ok for the time being.
The standard dv won't offer up the same sort of resistance a yellow spring in the 007 would though, would it? It may cause some premature dumping as the boost increases.
Just something to bare in mind.
Once you get your boost gauge plumbed that should all become evident though.
Have you seen this, quite a cool alternative to the nomad pillars.
http://www.awesome-gti.co.uk/product.php?xProd=11795&xSec=142
Yeah I know it isn't as good but that was the point of fitting it because I was worried that the 007 was sticking shut and not letting any pressure escape, at least with this one I know that it is escaping therefore ruling the DV out of the equation.
Thanks for the link but I'm keener on the Nomad, looks more OE
Similar threads
