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Model specific boards => Golf mk4 => Topic started by: MoMartin on 21 April 2016, 14:53
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Hi, I got my car remapped once again today (went off the large turbo idea) and after remapping it it's barely different to how it was before. It boosts to around 14 psi max and the power delivery in 2nd gear is all the way up at around 4k rpm.
Mods -
3" turbo back exhaust
Induction Kit
Front mounted intercooler
Forge 008
and maybe a few others that I'm forgetting.
Has anyone suffered from this before and how did you sort it if you did?
Thanks in advance.
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My mates vrs only boosted that stage2 but power band was further up than 4.
Actuator on turbo free all the way.
Or n75 valve. Maybe a little vac leak. Did the check car before the map
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I definitely know that it can boost and hold higher (up to 17psi) as beforehand it was supposedly mapped by the previous owners 'mate' who put a manual boost controller on it and used that to control the boost.
I'm about 90% sure there aren't any vacuum leaks, I've boost tested it myself and can now pressurise from turbo to inlet manifold at 30psi.
The only thing I still haven't tried is the n75 valve, but can this really limit the boost by around 4 psi?
Thanks
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I dont know. But it is used to control the boost.
If its on the way out. Itll drop boost off, but so willthe turbo if its on its way.
All vac lines tight. Are they still rubber?
Its not a boost leak, id not say anyway.
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Who mapped it?
Have you asked the mapper?
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I dont know. But it is used to control the boost.
If its on the way out. Itll drop boost off, but so willthe turbo if its on its way.
All vac lines tight. Are they still rubber?
Its not a boost leak, id not say anyway.
I've replaced almost all vacuum lines so I can't imagine any of that would be dodgy, All connectors are silicone too, and have been clamped using t bolt hose clamps. In regards to the n75, I'll see if there's anyone about in Manchester that I could borrow off for a quick trip.
Who mapped it?
Have you asked the mapper?
V12 Chip Tuning in Manchester, they have a good rep around here (not quite r-tech rep, but good rep nonetheless) so I trust they knew what they were doing.
I've emailed him and I'm waiting on the reply now.
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Boost controler goes between the n75 and the actuator... I think. Never fitted one but would bypass what the n75 wants the turbo to produce.
Is the controller removed now
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Yeah the main reason for remapping it was to get rid of the dodgy map it had on it. It would go into limp when the mbc had been taken off.
I could put the MBC back on, but surely this can't be the answer.
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Yeh that wont be the answer. N75 does that job. If you can swap it fora working one it rules that out
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If you've still got your OEM recirc valve try that.
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Yeh that wont be the answer. N75 does that job. If you can swap it fora working one it rules that out
I'll give Dalo Harkin a message, see if he's about! If anyone else in Manchester has one that I could borrow for a few minutes please get in contact! thanks.
If you've still got your OEM recirc valve try that.
I've got the forge 008, it's currently using the yellow spring which would be correct if this boosted correctly.
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I've got the forge 008, it's currently using the yellow spring which would be correct if this boosted correctly.
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It could be leaking slightly, OEM is more than up to the job, no harm in trying
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I've got the forge 008, it's currently using the yellow spring which would be correct if this boosted correctly.
It could be leaking slightly, OEM is more than up to the job, no harm in trying
[/quote]
Sorry I misread that, unfortunately I don't have the oem valve.
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I had a dodgy map on my auq when I had a custom map , went to a very well known mapping in London , and it still didn't really go to well, kept going into limp mode think 17705 , tried every thing they said boost leak , in end took it to nick , he laughed as it was one of his old maps they used ,but just turned the boost up , no timing /fuel etc , l
Nick sorted it ,
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I had a dodgy map on my auq when I had a custom map , went to a very well known mapping in London , and it still didn't really go to well, kept going into limp mode think 17705 , tried every thing they said boost leak , in end took it to nick , he laughed as it was one of his old maps they used ,but just turned the boost up , no timing /fuel etc , l
Nick sorted it ,
Sounds similar to what my car used to be like... now it won't boost fully, but is definitely better. I kind of wish I did take it to nick, but at the same time, It could of been a wasted trip if it was more severe than I thought.
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Pmd Mo :wink:
14 psi is rediculously low for stage 2 that's more stage 1 ( my stage 2 does 1.7 bar / 24.5 psi)
We'll have a good look Wednesday
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I had a dodgy map on my auq when I had a custom map , went to a very well known mapping in London , and it still didn't really go to well, kept going into limp mode think 17705 , tried every thing they said boost leak , in end took it to nick , he laughed as it was one of his old maps they used ,but just turned the boost up , no timing /fuel etc , l
Nick sorted it ,
Sounds similar to what my car used to be like... now it won't boost fully, but is definitely better. I kind of wish I did take it to nick, but at the same time, It could of been a wasted trip if it was more severe than I thought.
I believe this is why Nick is now asking for cars to be left with him for a few days at least
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I wish I just went for the big turbo build now!
I did a pressure test on my inlet earlier and found another pipe that was leaking, can anyone identify it?
http://imgur.com/iRkSbOL
Thanks
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Part of the vaccum system to the servo.
Or crank breather pipework that runs to the puk eventually
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Thanks Lemski, after some research I found that it was the suction pump vent. I'll try and silicone it tomorrow as they're £35 brand new!
Also -
I did some logging today If anyone's interested the CSV file can be downloaded here -
https://www.mediafire.com/?dddqgx67hrlo67d
If there's a way to share it without downloading please let me know.
A graph of my Specified and Actual boost is below -
(http://i.imgur.com/Hl9lQXI.jpg)
It looks as if the actual boost is always a bit higher than the specified. Any ideas on this?
EDIT - Also, after checking fault codes once again I'm now getting an additional two MAF codes (16486 / 16487 - this may have been caused by me unplugging it for testing.) and I'm still getting the boost pressure drop code(17705). I've found two of the air leaks, one has been fixed and the other should be fixed tomorrow, but both of them are far too minor to make a 4+psi difference. I've also serviced my Forge 008 which hasn't made a difference.
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It seems to jump further to the end when it should be smooth.
I agree that slight leaks shouldnt drop 4psi. Am still thinking n75 not opening the actuator enough.
Or on the otherside of things someone previously has tried winding the actuator.bar out instead of getting it mapped and wound it the wrong way causing it to not pull full boost because of the rod being set wrong.
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Something is causing your ECU to shut off the boost. To be honest the mapper should have found this fault after or before mapping it, not taking your money then leaving you to second guess it
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I'll be taking it back there some time this week.
Over the last 2 days I've found and fixed a few minor leaks but none of them equate to 4 psi loss.
I also borrowed a oem recirc valve today, which rules out the forge 008 ive got.
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were meeting later so can have a good look over it all. I'd be asking for your money back for a start, if there were boost leaks and they hadn't noticed these then that's a worry in itself :shocked:
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were meeting later so can have a good look over it all. I'd be asking for your money back for a start, if there were boost leaks and they hadn't noticed these then that's a worry in itself :shocked:
Thanks for the hand earlier, It's all rebooked in for this Saturday now. Hopefully they'll find and sort the issue. Personally I think he took a chance cutting corners by skipping the health check.
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Hopefully with your foot up their arse they'll get it sorted :afro:
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The guy seems pretty proactive to be fair, he was going to have my car back in the day after it was mapped but I found an air leak and put it off
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I've just got the car back from V12 once again and I'm happy to say the boosting issue has been resolved! It was definitely a software issue, though I did change a good few pipes that had been split.
It could potentially be worth taking it back one last time for a final tweak to the map, but overall I'm happy with the service V12 provided. I'm also still not ruling out a faulty n75 as the boost delivery is on and off at times.
Thanks for all the help