All Things Mk5 > Performance Modifications
Lightweight Crank Pully
th3_f15t:
I have a cam belt change to do on my 6R and wondering if it's worth investing in a lightweight crank pulley at the same time seeing as it'll be exposed and being worked on.
Any reason not to get one?
Tfsi_Mike:
I've read lightweight ones can have an adverse effect due to not being in sync with the harmonics of the engine. There was a good read that helped explain it, somewhere.
I fitted the fluidDampr pulley to mine. Not lighter but is supposed to be a performance enhancer.
AJP:
I think @Shoduchi tried one. IIRC there were potential issues. I'm not sure if he kept it or went back to standard.
Shoduchi:
I researched and shared my findings in my topic build after being alerted of the potential dangers of fitting the lightweight pulley: http://www.mk5golfgti.co.uk/forum/index.php/topic,95592.405.html.
My final conclusion was this:
--- Quote from: Shoduchi on January 23, 2017, 11:19:04 pm ---After testing more carefully my car now, it's my opinion that the lightweight engine pulley does make a difference. The engine revved quicker from lower RPM with it fitted. Just to share my experience. I don't regret returning to stock since I value more my engine's lifespan. :smiley:
--- End quote ---
Its more dangerous to engines that run for long periods near the redline. For daily use without pushing too much the engine I bet the problem wouldn't happen before the end of the lifetime of the car. Since I pretend to go to track days 3-4x/year I won't risk breaking my engine. The OEM pulley has a rubber layer to damp the harmonics of the injection at high rpm. :smiley:
pudding:
Someone posted on the TFSI FB group over the weekend it was the best £100 he's spent on the engine. GFB pulley. So that's 2 positive reviews so far :smiley:
Did you notice any increase in vibrations the guys using GFB and Fluidampr pullies?
I think it would be a bit more beneficial if added to a lightweight flywheel to further reduce rotational mass, but the rattles would do peoples heads in!
I did all that years ago and I thing I noticed as well as quicker throttle response was improved engine braking.
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