All Things Mk5 > Mk5 General Area
Down on power....
RedRobin:
--- Quote from: T88OMM on November 01, 2008, 11:10:49 am ---KO4 KO4 KO4 :mad: :jumpmove: That would be my decision but then again I can never get enough POWER! :jumping: The second hand KO3 sounds like a viable option and a relatively inexpensive one at the same time. As you say you dont want 300 neddies going through your front wheels so this has gotta be the route to go down! :happy2:
--- End quote ---
....Too many neddies for my taste and also £4,000!
But importantly, as TT has posted:
"High turbo boost + big turbo + high compression ratio = much shorter engine life" -
Which translates to:
"Higher boost level from the remap + K04 bigger turbo + high compression ratio (GTI, not Ed30) = much shorter engine life" - Or so it seems to me.
RedRobin:
--- Quote from: Teutonic_Tamer on November 01, 2008, 09:44:55 am ---Robin, have you ever been on any other rollers? Maybe JKM have had theirs recalibrated since your first run way back when. I am aware that DD rollers are supposed to be the most tightly regulated, by the manufacturer - and if JKMs were being "over generous" when initially installed - a subsequent recalibration might have down-corrected their readings. I simply mention this because you seem to be saying that the stage 2 "seems better" - so your butt-dyno is telling you the stage 2 is better, but the RR is telling you the opposite.
--- End quote ---
....I went on some Dyno-Dynamic rollers at Weston Performance today but in Stock map (202.3 bhp) and with a boost graph which showed spike at 1.2 bar and bad drop off from 2,400 revs. Best to forget my butt-dyno!
--- Quote from: Teutonic_Tamer on November 01, 2008, 09:44:55 am ---Engine oil - what brand, type and spec oil do you use? And what is your oil consumption like? Do you religiously keep it topped up to the max by adding small amounts frequently, or do you let the oil get fairly low and then add quite a lot?
--- End quote ---
....Both!! Usually frequent top-ups but there have been a couple of low fills. VW approved Mobil from my dealer. Consumption was heavy for first few thousand miles but now not so often. I change my oil every 10,000 miles.
--- Quote from: Teutonic_Tamer on November 01, 2008, 09:44:55 am ---Onto the specifics of oil in the turbo discharge pipe. Firstly, you stated "Inlet seals removed and cleaned and all ok in that area now" - but do you mean the seals on the pipework, the seals on the turbine shaft, or do you mean the valve stem oil seals for the "poppet valves" in the cylinder head?
--- End quote ---
....Seals on the pipework.
--- Quote from: Teutonic_Tamer on November 01, 2008, 09:44:55 am ---Regarding actually finding oil in the turbo discharge pipe, I think this is fairly common. I found oil in mine, and inside the standard intercooler - but it wasnt much. Maybe one or two tablespoons, which is fairly reasonable. However, I wonder if the stock GTI intercooler has something to do with this? I personally reckon the stock i/c is slightly restrictive, which can cause a slight backpressure on the inlet side of the turbo. Since upgrading mine to the S3 cooler and twintercooler, I do notice a much more rapid rise in turbo boost - which prooves that the airflow through the inlet tract is much freer and less restrictive. Maybe this is also having an effect on the way that the oil vapours from the crankcase ventilation system are not getting to the combustion chambers quick enough. Think of having a hot shower in a closed bathroom - the shower will steam away, but if you have a mega powerful extractor fan immediately above the shower head, it will suck out all the steam. However, if you have a clogged, weedy fan, the steam wont get sucked out, but will condense on your bathroom mirror, and then dribble off the bottom edge.
--- End quote ---
....Sounds like very good justification for a S3 intercooler! My priorities are (1) This turbo issue (2) Suspension due to KoniFSD issue (3) Powdercoat Monzas.
--- Quote from: Teutonic_Tamer on November 01, 2008, 09:44:55 am ---Onto a couple of other issues. Did JKM plug in a VAG-COM to check for fault codes? And did they carefully monitor the N75 cycle?
--- End quote ---
....Yes and no fault codes seen. Dunno about N75 cycle - What is that?
--- Quote from: Teutonic_Tamer on November 01, 2008, 09:44:55 am ---Regarding the actual replacement of the turbo - only you can decide which is the best way. However, I would personally never recommend any second hand turbo, no matter how well the previous owner claimed to have looked after it. You only need to recall some of the threads on the other GTI fourm (revving engines whilst stationary, "blipping" throttles, correct turbo cool down - I even think that you mis-understood about the cool-down procedure), and it simply showed a fundamental lack of knowledge on how to car for an engine in general, let alone the specific requirements of a turbo. If I were forced to only take a 2nd hand turbo, then I would send it to a specialist turbo re-builder for a complete overhall and warranty.
If your original turbo is knackered, I would personally seek a specialist recon, or go for the genuine new VW part. Yes, I understand your POV that the official VW 2 year warranty will probably be void - but it is the "peace of mind" from getting an OEM supplied part - you can pretty much expect an OEM new turbo to last a long while, but how long will a slightly cheaper second hand one last. The labour charges will be the same, but if the 2nd hand one doesn't last, then someone will be paying the labour charges all over again.
--- End quote ---
....As usual, you make a very good point. If the second-hand K03 costs £400 + £200?? for overhaul = £600 approx and a new VW one costs £650, which to go for? I don't know if it's true but I've heard that VW sell reconditioned turbos.
Thanks as always for your time and valuable input :happy2:
WhiteGTI:
--- Quote from: RedRobin on November 01, 2008, 07:49:34 pm ---
--- Quote from: WhiteGTI on November 01, 2008, 08:14:32 am ---Now your making me nervous with my Stage 2 !!!!
--- End quote ---
....I'm very confident it isn't down to Revo Stage2. Boost is set at 7, which isn't at all excessive. Also there are plenty people running Revo's Stage2 on the 2.0T FSI with very similar mods to mine (you for example!).
The boost graph shows that it's spiking at 1.2 bar and then dropping off badly from 2,400 revs.
--- End quote ---
True, but I have only been running mine for just over two weeks, and have rarely pushed the car (due to the weather)! I think my boost has been set to 6, as Keith at JKM noticed that fuel pressure was dropping, resulting in fuel cuts when the boost was set to 7. Interesting that your car was set (and ok) at 7!
Do you know of any other regular GTI's with stage 2 software other than yourself and I? I have seen a lot of Skoda's on their forum that have Revo Stage 2 software, and they seem to be ok.
Hope you get your troubles sorted Robin.
Chris.
vRStu:
By looking at the duty cycle of the N75 you can determine how hard your turbo is working to provide the requested pressure.
YOu can buy a turbo on an exchange basis from VW but I'm unsure of the pricing. The part number will normally end with an X.
RedRobin:
....
Thanks, Stu - Keith showed me a column of numbers which showed that requested boost levels were down from 'normal'. He later mentioned 200 millibars off.
I think that the £650 price Kate gave me is as an exchange with VW. Otherwise about £1,000 I think but am not certain.
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