All Things Mk5 > Mk5 General Area
Down on power....
RedRobin:
....
Going on JKM's Dyno-Dynamics rollers when my Revo Stage1 was installed, plotted smooth healthy curves with 236 bhp and just under 300 ft lbs. In late September Revo HQ loaded Stage2 and we went out on the road and everything was fine and dandy - A subtle but strong power. So, in early October about 20 of us met up for a social rolling road session at JKM and I was very surprised to plot less than 230 bhp with Stage2.
My VW dealer had spotted that my Milltek cat was deteriorating and so Milltek kindly replaced the whole downpipe and sportscat but a diagnostic session on JKM's dyno still showed only 228 bhp. Keith at JKM thought it was likely to be a boost leak because of data logging the boost request levels.
So today we had another session and Jim took the car apart as follows : -
Oil blow by leak on seals by Turbo Discharge to Intercooler. Inlet seals removed and cleaned and all ok in that area now.
Forge DV removed and checked. Seals renewed anyway and no faults found.
DV vacuum lines checked with vacuum gauge and all ok.
PCV valve checked and all ok. PCV valve blank-off used for testing - No differences to performance/boost response.
Air box removed and car run - No changes to performance/boost response.
As there are no apparent boost leaks at this stage JKM would like to mechanically inspect the turbocharger for any internal damage or potential cracks on wastegate housing etc. They are fairly confident it's the turbo but of course can't be 100% sure yet.
So, my options are : -
1) - Inspect the turbo but have to hire a car while it's either sent away to a specialist if no damage is obvious. This would have a cost and would also probably not be financially viable to repair.
2) - Buy a new K03 turbo (about £650) with 2-year warranty. BUT....That warranty would be ineffective because VW would claim that my car is too modified by its remap and exhaust.
3) - Buy a hardly used K03 which has done less than 4,000 miles and which JKM know to be in top notch condition. It was taken off for a K04 conversion. Cost £400. Swop turbo's in the same day.
4) - Spend several thousand pounds (£4K) on the K04 conversion and end up with around 300 bhp but all the potential problems that could bring to a stock GTI engine internals (not Ed30).
So I'm going for option #3 and I bet lots of you will say go for option #4 the K04 conversion!!
Meanwhile, I'm running around in stock map and it does feel rather dull by comparison, though of course it's not!
Initially it's easy to think that none of this would have happened if I hadn't modded my car, but as she's only down on the power she should be (closer to 260 bhp instead of today's 236 bhp), without being modded and going on the rollers etc, I might not even suspect anything was wrong and the situation become worse.
Apart from the obvious benefit of the quasi-religious experience of driving a fast modified car, I am convinced that running a modded car responsibly encourages far better care and maintenance.
Top Cat:
Thats not good news Red. :sad: I would have a good think about how long your going to keep the car for i say this only in relation to the fact if you go for the KO3 but then get drawn into going for the KO4 at a later date you no you cant resist and if you keep the car for any length of time you will be pinning for the bigger turbo at some stage. plus i thought the K04 worked well with our engines and produce more torque due to better compression. either way its not good it goes with the territory i suppose. :smiley:
vRStu:
Bit of a blow that Robin.
When have you got her booked in for then?
RedRobin:
....
Not booked in until Kate knows when JKM can get that 4k miles K03 from its owner.
JKM's basic K04 conversion (taking into account my existing mods) would be £4,000 incl vat and that doesn't match what I want - I actually don't want 300 neddies at my front wheels, even though I have a Quaife. I don't want the insurance hike either. I prefer my power lower down in the more legal speed range - I don't drive the German autobahns that often.
But isn't the Ed30 engine stronger and different from the GTI? Or doesn't it matter regarding a larger turbocharger?
:happy2:
Top Cat:
yes the ED30 does have stronger internals but the compression is better on ours. i believe.
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