GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: oceanic-green on 07 March 2014, 11:57
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Bit of a mystery this one. I had a new K250 put on the other day which came with an uprated actuator and everything was fine, but now I can only hit 10-11 psi boost and can't get the bhp over 177, when it should be hitting 19-20 psi boost and 235 + bhp.
I can't find any boost leaks in the pipes at all, can't hear any boost leak and there are no codes on the ecu at all!
any ideas what else to check? what else could cause the boost pressure to drop so much other than a leak?
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sounds like its running without the map... has it been like this since the 250 was fitted or did the drop in power happen more recently
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sounds like its running without the map... has it been like this since the 250 was fitted or did the drop in power happen more recently
The K250 was fitted Monday just gone, everything was fine, it even hit 246bhp according to my liquid cube device. I have not had it mapped in because you don't need to. I went stage 2 remap before Christmas.
The other day I was driving it and had a clear road so I thought I would see what the bhp was like, when all of a sudden it stopped feeling like it was pulling. Since then it has only managed 10-11 psi!
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Id check the boost pipes again, check the DV etc.
Nightmare when you get an issue that's hard to diagnose as I am too.
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Id check the boost pipes again, check the DV etc.
Nightmare when you get an issue that's hard to diagnose as I am too.
What is the issue you have at the moment?
Do you think it could be the actuator, would that cause a boost issue if it wasn't set properly
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Is it an uprated actuator as in a Forge or something? what colour spring?
My turbo is buggered too :cry:
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Is it an uprated actuator as in a Forge or something? what colour spring?
My turbo is buggered too :cry:
The actuator is supposed to be an uprated one, which came with the turbo. I do still have the Forge one with a yellow spring that the car was remapped with, but as the K250 came with an uprated actuator I thought it would be best to use the one that came with it!
Sorry to hear about your turbo. I have a ko3s that I am going to sell, but think it was on its way out and will only really be any good for someone to refurb
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I'm having the same sort of issue I'm on stage 2 map and the boost is spiking at 11-13 psi I have tried all I can think of like replacing breather pipes vac pipes checking boost pipes changed the n75 I have a service kit for the 007p on order don't get me wrong it still shifts but any help would be appreciated likewise if I come up with anything I'll post it here
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I have been speaking to R-Tech and they say it will need remapping again for the new mods! So a trip back up to see them soon it is :smiley:
All I can think is that as soon as the new turbo was put on with the supersize tip and ported manifold, the ecu took a few miles to register the new mods and once it had it went into safe mode! :undecided:
The annoying thing though is that I bought that particular turbo because it did not need remapping in.
I'm having the same sort of issue I'm on stage 2 map and the boost is spiking at 11-13 psi I have tried all I can think of like replacing breather pipes vac pipes checking boost pipes changed the n75 I have a service kit for the 007p on order don't get me wrong it still shifts but any help would be appreciated likewise if I come up with anything I'll post it here
Have you got a fmic? because I thought you beed one for stage 2. When I was running just a stage 1 I had a consistent lack of power problem, which I replaced everything that eventually enabled me to go to stage 2 and still had not fixed it. So when I took it to R-tech for them to remap to stage 2, Niki found the problem straight away, it was a weak fuel pump that was on its way out! So that could be worth a try if you have done everything else!
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I have been speaking to R-Tech and they say it will need remapping again for the new mods! So a trip back up to see them soon it is :smiley:
All I can think is that as soon as the new turbo was put on with the supersize tip and ported manifold, the ecu took a few miles to register the new mods and once it had it went into safe mode! :undecided:
The annoying thing though is that I bought that particular turbo because it did not need remapping in.
I'm having the same sort of issue I'm on stage 2 map and the boost is spiking at 11-13 psi I have tried all I can think of like replacing breather pipes vac pipes checking boost pipes changed the n75 I have a service kit for the 007p on order don't get me wrong it still shifts but any help would be appreciated likewise if I come up with anything I'll post it here
Have you got a fmic? because I thought you beed one for stage 2. When I was running just a stage 1 I had a consistent lack of power problem, which I replaced everything that eventually enabled me to go to stage 2 and still had not fixed it. So when I took it to R-tech for them to remap to stage 2, Niki found the problem straight away, it was a weak fuel pump that was on its way out! So that could be worth a try if you have done everything else!
im with this. It most likely would need remapping due to the different turbo. Even though its a k03s but its been modified so i would defo listen to my man!
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will need mapping having a stronger actuator/ slightly different turbo as it's probably over boosting with the new turbo on
do you have VDCS or a fault code reader?
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will need mapping having a stronger actuator/ slightly different turbo as it's probably over boosting with the new turbo on
do you have VDCS or a fault code reader?
I am not sure if it is stronger actuator than my Forge. I was thinking of putting my Forge with the yellow spring back on because it was remapped at stage 2 with it.
I have the free version of VCDS and a liquid cube, but no faults are showing up, or were you thinking of doing certain logs?
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If it's anything other than an AGU you can log the requested vs actual boost
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If it's anything other than an AGU you can log the requested vs actual boost
can that be done on the free version of VCDS? If not I have a liquid cube and that has something that measures the N75 position. Would that be the same ?
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Update! I had another look for some leaks and underneath the metal plate that is attached to the inlet manifold there was a silicone pipe which is connected to the N112 valve (I think), which I could very easily pull off the valve because the screw on the hose clip had popped out, so I fitted a cable tie and a new hose clip. This definitely made the car much better as I was hitting 17 psi and holding about 15-16 psi, where as before it was only holding at 10-11 psi. I then adjusted the actuator this morning to 3 & 1/2 turns of preload and now the car is holding boost at 18 psi. I did the usual bhp test of red line in 3rd and I got 243 bhp :smug:
The car feels so much better and pulls really well :smiley:
bo
I still think I will go to R-tech and get Niki to tweak the map a bit for the new turbo, supersize tip and ported manifold. I am also thinking of adding some better injectors, and maybe Devils own wmi. As far as I know from what I have read, I can do this without changing the maf because it is an AUM.
What do you guys think?
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You may need the S3 MAF for more power. They're not that expensive and can always be sold on again if not actually needed
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You may need the S3 MAF for more power. They're not that expensive and can always be sold on again if not actually needed
ok, thanks. Is the S3 MAF the same size as my AUM one. i.e will it fit in the tip I already use?
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Update! I had another look for some leaks and underneath the metal plate that is attached to the inlet manifold there was a silicone pipe which is connected to the N112 valve (I think), which I could very easily pull off the valve because the screw on the hose clip had popped out, so I fitted a cable tie and a new hose clip. This definitely made the car much better as I was hitting 17 psi and holding about 15-16 psi, where as before it was only holding at 10-11 psi. I then adjusted the actuator this morning to 3 & 1/2 turns of preload and now the car is holding boost at 18 psi. I did the usual bhp test of red line in 3rd and I got 243 bhp :smug:
The car feels so much better and pulls really well :smiley:
bo
I still think I will go to R-tech and get Niki to tweak the map a bit for the new turbo, supersize tip and ported manifold. I am also thinking of adding some better injectors, and maybe Devils own wmi. As far as I know from what I have read, I can do this without changing the maf because it is an AUM.
What do you guys think?
Rip it all out and delete the N249 and N112, fit a catch can, one of the best mods I ever did
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Update! I had another look for some leaks and underneath the metal plate that is attached to the inlet manifold there was a silicone pipe which is connected to the N112 valve (I think), which I could very easily pull off the valve because the screw on the hose clip had popped out, so I fitted a cable tie and a new hose clip. This definitely made the car much better as I was hitting 17 psi and holding about 15-16 psi, where as before it was only holding at 10-11 psi. I then adjusted the actuator this morning to 3 & 1/2 turns of preload and now the car is holding boost at 18 psi. I did the usual bhp test of red line in 3rd and I got 243 bhp :smug:
The car feels so much better and pulls really well :smiley:
bo
I still think I will go to R-tech and get Niki to tweak the map a bit for the new turbo, supersize tip and ported manifold. I am also thinking of adding some better injectors, and maybe Devils own wmi. As far as I know from what I have read, I can do this without changing the maf because it is an AUM.
What do you guys think?
Rip it all out and delete the N249 and N112, fit a catch can, one of the best mods I ever did
Have a look at my mod list below my post :wink: :smiley:
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Spoke with R-Tech this afternoon and all I need to get are some BAM injectors!