All Things Mk5 > Mk5 General Area
Down on power....
ukdub:
--- Quote from: RedRobin on November 07, 2008, 11:10:34 pm ---....
Thanks for the good wishes, guys :happy2:
JKM removed and inspected my turbo and, as suspected, the casing around the 'Penny Valve' Wastegate has a small crack. When I was chatting with VW Racing about my problem yesterday, they said it was probably Wastegate area or Penny Valve as JKM had exhaustively tested other possibilities.
I'll post pics at the weekend - Am off to APS tomorrow.
My original turbo is a Rev C, whereas my 'new' one is Rev G but there's no obviously visible difference!
Instead of trying so hard to meet boost requests that we were seeing >90% effort in the data logs, we are now seeing as little as 65% and mostly in the 70's - So now there's plenty headroom (tolerance).
JKM also set my Revo to Boost 6 instead of 7. It'll run 7 fine but we decided 6 just as an extra margin of safety.
So initially she making just over 240 bhp with a very healthy torque curve but we need to let the whole ECU learn the new setup and settle before another dyno session.
The dyno has been invaluable as a tool for assessment and diagnosis and then checking everything afterwards. Jim did some road testing with the laptop as well.
JKM are a great team - Jim is the mechanical expert and Keith the electronics expert and they specialise in VAG cars.
The probable cause of the crack is heat - Turbo's are subjected to extremely high temperatures - And a weakness in the metal casing. At first it's easy to regret that it didn't happen while still under warranty but I doubt very much if VW would have accepted my issue with my other modifications being present. There have been cases of metal failure in the K03 turbo on standard 2.0T FSI engines, so it's not a problem exclusive to remapped engines.
It's great to have that extra power back!
--- End quote ---
Do you think this could happen to our k04 brothers as well RR?
RedRobin:
--- Quote from: Greenouse on November 07, 2008, 11:13:51 pm ---As daft as this sounds that's good news isn't it? At least you now know whats involved and how much it will cost.......
P.S. I bet you enjoyed the drive today, the weather was 8)
--- End quote ---
....Not as daft as some may think - It was excellent news as far as we were all concerned because the problem was found and now the new turbo is on, it's solved.
I drove up to the Guildford area to see some friends and then back down the A3 and then home - About 120 miles on the new turbo. Torrential rain on the A3 in the dark but the GTI handles all that sort of thing without any effort and my Quaife is brilliant in the wet.
:happy2:
RedRobin:
--- Quote from: ukdub on November 07, 2008, 11:38:36 pm ---Do you think this could happen to our k04 brothers as well RR?
--- End quote ---
....I regret to say definitely yes - It COULD happen but of course might not. It's more likely to happen on a remapped engine because more boost is requested and so more effort and hence heat is generated. But just as stock DV's have failed, so can anything standard.
Greeners:
Really pleased to hear this is sorted Robin, keep enjoying :happy2:
RedRobin:
....
Thanks, Nathan :happy2:
It's great to have the support of so many fellow enthusiasts here and I hope my experiences on this problem may help others - neg perhaps.
I have to say that I couldn't have been in better hands than JKM - Their approach and methods were spot-on!
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