I have recently tried to get my remap upgraded to Custom Code Phase 2 after running Phase 1 since the beginning of April, The turbo seemed reluctant to hold boost over 4.5K when we first put the map on but thought that it would be possible to tweak this on phase 2. I went for phase 2 on Thursday but could not have it as the turbo does not seem to want to boost any higher than it is currently.

Is my turbo on it's way out, it doesn't seem to be able to boost any higher than a peak of about 19.5 PSI or could this simply be a result of a boost leak?

Boost log.txt

No idea as to your turbo health...however my car was once phase 2'd aswell and ran like a dog on acid with seawater for breakfast.

Changed the map software provider and it got better; magically of course. For the record the phase2 map appeared to be using too much boost and then of course the ecu / related bits of mechanical gubbins let go and it starts over again, or appears to not hold boost or however one cares to describe it.

Check out my post in freedom about it, I'd hazzard a guess it's not your car

more than 19.5psi :eek:

thats about as high as the turbos go mate, my map peaks at about19psi for a very short time then drops down to about 14psi at high revs.

boost isn't everything though, berreta and i compared notes at the marlin RR day and he made more power than me at lower boost levels with pretty much the same mods

my scud octy runs a custom-code ph2 map and has a blue flame sports cat + milltek system and peaks at about 19psi to 22psi has good mid range punch but does run outa puff at the top end (fuel + flow problems) basically the turbo is running at its limit,so if yours is running that sorta boost i dont think anythings up. has your car got a sports cat? if it has'nt the ph2 will not work properly i pressume that it has as a custom-code dealer should not map it if it dosent!

ko4 is what u need + leon cupra manifold and bigger injectors oh and a fmic for more power u might also need a different down pipe im in the process of doing this to my car,if the car drives ok and dosent appear to nip up on the timing then i think the car is fine, i hav'nt bothered to log my boost settings i can if it would be of help to u, let me know.

ta tar

Well my Phase 2 map is fine, fine enough to run a 14.296s 1/4 mile last Sunday at Crail with more to come due to my poor technique at getting off the line!!

Here's a couple of boost logs from my Phase 2

Id hazzard a guess its a hardware problem, not the mapping :P

Just to add, both Dave's and my spec are almost identical so why would it be a mapping fault that he isn't holding boost yet my car can do perfectly adequatly, remembering its merely a hairdryer of a turbo so won't be setting the world on fire anytime soon.

Problem is where do I start.....new turbo? Boost Leak? worn wastegate actuator, N75.....the list goes on..........

Is vag com showing no faults? if not 1st thing i'd do is check all the boost pipes especially the one that comes off the metal turbo pipe that connects to the pancake pipe as they often leak and usually are the cause of the 17705 fault code other than that it may be a case of changing parts over,cheapest 1st

out of interest did you have the forge FMIC? and if so could that cause a small pressure loss? cos the size of the core is huge on mine plus with the extra length in pipework maybe the k03s doesn't have enough puff to fill the system fast enough

Dave has the same Forge FMIC as me, see my graphs above for boost.

Are the intercoolers exactly the same on the golf as they are on the octavia cos my forge FMIC has a huge core and often wondered if the k03s had enough pressure to fill it

hope its not the turbo as i've changed two on mine and the initial problem was that at higher revs the play in the main shafts bearing allowed the compressor wheel to slightly catch the housing and start to slow it down and started to lose boost until it got to the point that the bearing had that much play that the compressor wheel was rubbing against the housing that hard that you could hear it screeching,when it was removed you could see the compressor wheels blades where curling over,fault was caused by a slight blockage in the oil feed pipe and was starving the bearing of oil,didn't know that until i'd blown the second turbo though,so all pipes where changed on this turbo and all has been well since,but hope your fault is less severe

Yes, Gary's got an octavia FMIC fitted, my car is now almost identical engine mods wise to Gary's......a bit p#d iff about this, may well have sourced a replacement turbo but I want to make absolutely sure that this is the problem....I have other thoughts on this ( you know what I mean Gary) there are no fault codes showing although unless it was a really bad boost leak I would not expect there to be.

My car also ran very well on Custom-Code Phase 2, again with almost identical mods to Gary and performance/power were VERY similar. My known good K03s and actuator are available if you're interested but I'd eliminate other possibilities before changing the turbo. What did JBS suggest the problem could be? I'd suggest meeting up with somone who has known good parts and try swapping with some of the simpler parts such as N75, DV etc...

No idea as to your turbo health...however my car was once phase 2'd aswell and ran like a dog on acid with seawater for breakfast.

Changed the map software provider and it got better; magically of course. For the record the phase2 map appeared to be using too much boost and then of course the ecu / related bits of mechanical gubbins let go and it starts over again' date=' or appears to not hold boost or however one cares to describe it.

Check out my post in freedom about it, I'd hazzard a guess it's not your car [/quote']

Dave had a similar problem with APR Stage 2 though Colin that you had with CC P2 and on his car that was proved not to be the hardware. Also worth noting that APR insisted that high boost wasn't the way to make power yet there latest stage 2 maps run 1.3bar of boost. :confused:

Hope you get to the bottom of this problem quickly and cheaply,as Eddy says i'd try other things before doing a turbo swap as it would be quite an expensive mistake if you swapped it and still had the problem,good luck

I can pick up a K03S at a very reasonable price with low miles on it so and would change the turbo out myself, not a particularly big job when you consider I have modded the crashbar, fitted the Forge FMIC, Modded the droplinks, made droplink carriers for the Coilovers done the brakes twice and fitted all the other bits bar the exhaust...turbo swap = one saturday afternoon! especially as it is like for like.

I need to whip the downpipe off to check the turbine wheel and the inlet to see if there is any play in the shaft / bearings.

If you get stuck I have a spare turbo in the garage that needs a new home

PM me if interested

Cheers Stuart, will bear that in mind!

Dave