GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: pickles on 15 August 2015, 17:46
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can anyone on here who reads and understand vag com logs give me a 2nd opinion, think my MAF is on the way out, just need confirmation.
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http://s000.tinyupload.com/index.php?file_id=07989543859291420628
is the log
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Hard to tell as it doesn't look like any of the runs are a full throttle run...
Do it again at full throttle until redline if you can
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thats about as high as i get without loosing boost :(, arnt the numbers low tho.
done another log but again couldnt get past 6000 rpm, also logged my timing.
changed my n75 for an old c type i had lying around so logs are with the old valve in, how do the n75 numbers look.
http://s000.tinyupload.com/index.php?file_id=63780478044559150883
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can you check your throttle angle mate?
Agreed it looks like it's taking an age to get anywhere, N75 seems to drop off too
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its 1.3* , i think this is within range, gotta new MAF coming, (doesnt go wrong if its not that, think the one thats in just now is over a year old so not bad :grin:,) if that dont fix it, then its N75 time, whats ppls thoughts on the H version, hit n miss ?, failing that ill be looking at the wastegate actuator, fingers crossed it aint that cos that would mean dropping the turbo to change it :(
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You don't need to take the turbo right out for that :wink:
If I take the take the car out for a spin I'll get some logs for you have a look through for reference. Might even have one on the computer....
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that would be great if you could m8 thanks, can you change the actuator without having to remove the manifold, heard its a right coont.
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manifold has to come off unfortunately
These might help, they're old but might be good for a comparison
(http://img.photobucket.com/albums/0803/WesRS/logs002.jpg) (http://smg.photobucket.com/user/WesRS/media/logs002.jpg.html)
(http://img.photobucket.com/albums/0803/WesRS/logs003.jpg) (http://smg.photobucket.com/user/WesRS/media/logs003.jpg.html)
(http://img.photobucket.com/albums/0803/WesRS/logs025.jpg) (http://smg.photobucket.com/user/WesRS/media/logs025.jpg.html)
I think they were all from the same run...
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starting to think its defo more a weak actuator or n75 now tbh after reading up a bit on it, my boost gauge shows me peaking at 10 psi and then dropping suddenly, surely this would be the n75 not being able to hold the wastegate shut at that pressure and just opening.
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thanks for that, my maf readings are less than half of yours at 6000rpm, also my duty cycle maxes out on mine sooner.
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noticed on block 25 my actual load is way out from the specified load, could this mean a duff valve.
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I'm thinking actuator mate... Doesn't look like you're holding boost and if you've tried another valve it doesn't leave many options other than a boost leak maybe :sad:
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me too :(, mind you it was an old valve i put on, im sure i took it off last year cause it was giving me jip, what about the maf readings, surely there suspect, does maf signals not help control the n75 ?
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well my maf readings have improved a bit however, still cant get past 10 psi :(, gona try n crank the wastegate a bit see if it stiffens the spring a bit, and think about a new n75 .
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Yeah without the boost the MAF readings will be low
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gona try n see if i can take up some slack in the spring on the actuator see if it improves.
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managed to get about 1 and half turns on the actuator nuts, (was a right pita). my rod was spinning when i was trying to turn it so had to hold the rod with some mole grips, would the rod moving make my measurements out as im assuming this is screwing into something inside the actuator, might have only got half a turn if thats the case, anyway it seemed to hold at 10 psi for a lil longer before it dropped off and car feels a bit pokier, might just be having a good day tho lol .
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update, new valve on and still not boosting past 10 psi :(, gona knock up a pressure tester n give all the hoses one last check, failing that iv a ko3s in the garage, not sure if the actuator will be the same or not, could always fit the k03s but dont wanna go down that route .
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Actuators are different pressure ratings from K03 to K03s
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dont suppose the actuator have the same fitament, i know the ko3s uses a 85N rather than the ko3 65N but im thinking that would help me out in this case, been looking at uprated ones from beachbuggy , they do 10/15psi ones for £50/75
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it's hit and miss as to whether they have the same bracket fitment, Forge have 3 different designs I think
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thanks for the info m8, got a couple of actuators lying in the garage but only wana do this once so going to buy a new one for peace of mind.