So bare with me I'm new to b8 chassis supercharged v6 but not new to audi's. But I've been trying to research into it but it seems as tho there's quite a bit of pulley upgrades for our cars now. But is it acceptable to mix different pulleys and tunes? I.e. Apr or forge pulley with a giac tune, awe pulley with an Apr , etc. Is there really any error to it seeing a few people have done it but I can't find definite info on if its legit or not. Thought about trying to make some stuff work being some pulleys are smaller and cheaper like the cts turbo pulley being the smallest but also the cheapest . Wana know if I could use said pulley with like a giac or Apr or EPL etc tune and what are the possible outcomes
Mixing pulley upgrade and tunes. Can you buy one shops pulley and use a different tune?
- Thread starter Mrmcd982
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Welcome to Audi-sport.net. The size of the pulley would alter the speed of the supercharger and as such the available boost at any point. Thus although it may work for some people with some combinations of pulley and tune it probably wouldn't work for all the possible combinations.
Having a quick search on the net
B8 / B8.5 S4 Supercharger Pulley Diameters / Sizes from largest to smallest - measured at the tips of the ribs
Stock: 63.25mm - verified independently
Unitronic: 58.30mm -
APR: 57.75mm - verified independently
Revo: 57.65mm - revo provided number
GIAC/AWE: 57.55mm - verified independently x2
CTS: 57.02 - verified independently
The CTS pulley is approx. 10.9% smaller than the standard one. The APR item 9.7% smaller .
Not that much difference but the companies spend a lot of time money and effort to get these tunes correct. The difference between an APR / Revo and GIAC pulley is probably negligeable.
Why not get the CTS pulley and get it custom mapped by @Rick @ Unicorn Motor Dev.
Having a quick search on the net
B8 / B8.5 S4 Supercharger Pulley Diameters / Sizes from largest to smallest - measured at the tips of the ribs
Stock: 63.25mm - verified independently
Unitronic: 58.30mm -
APR: 57.75mm - verified independently
Revo: 57.65mm - revo provided number
GIAC/AWE: 57.55mm - verified independently x2
CTS: 57.02 - verified independently
The CTS pulley is approx. 10.9% smaller than the standard one. The APR item 9.7% smaller .
Not that much difference but the companies spend a lot of time money and effort to get these tunes correct. The difference between an APR / Revo and GIAC pulley is probably negligeable.
Why not get the CTS pulley and get it custom mapped by @Rick @ Unicorn Motor Dev.
ANDYTQ
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MRC don't change the supercharger pully and as far as I know never have.
From day 1 they have been changing the crank pully instead and have 3 different sizes.
You save money going stage 2 this way as they don't have to put the car into the service position to change the crank so save on labour.
Only thing that scares me a little about this method is that the standard crank pully is dampened and the MRC pullys arnt. The standard dampened pully does give way fairly regularly and cause a fair bit of damage but I can't help it think it's dampened for a reason and could cause problems long term having a solid pully.
I have been thinking about that as I have the MRC pulley but :
We have heard of the stock dampened pulley failing, but have we heard of the MRC one failing ? not to my knowledge.
Plus, many companies in the US are now proposing crankshaft pulley change, or even dual pulley setup..
it should be fine.. well let's hope.
We have heard of the stock dampened pulley failing, but have we heard of the MRC one failing ? not to my knowledge.
Plus, many companies in the US are now proposing crankshaft pulley change, or even dual pulley setup..
it should be fine.. well let's hope.
As far as I can gather though it's not something that will cause problems in the short term. V6 engines are naturally quite 'unbalanced' and the dampening if I remember right is to do with harmonic vibrations or something (which I admit I know nothing about) but which I believe can cause premature wear to things like bearings. If you change your cars often (as most do) it's not going to be much of a problem but I tend to keep my cars a long time and I don't want to cause problems 5-10yrs down the line
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http://www.vdamper.com/30-V6-TSI-Supercharged_p_42.html do damped pulleys in different sizes for our engines
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I wish I could add to this thread based on direct experience, but out of pre-2014 stage 2 envy I have read a LOT on the subject.
There are not many reports of OEM crank pulley failure but Doug at MRC wrote on one forum thread that he had come across at least one. Clearly the MRC pulley solves this risk because it is a single-part pulley, but then there's the matter of what is the residual risk of damage to ancillaries without the vibration damper. There are a lot of cars out there with oversize single-part crank pulleys and as far as I know no reports of problems that could have been caused by vibrations, but that doesn't prove that there is no risk, particularly over the longer term.
Seems to me that the solution is a bit like what we had with the DVs on the B5. Either upgrade with an oversize dampened crank pulley (I think the iABED vdamper is the only available option) or go with the undersize supercharger pulley and regularly check and replace the OEM crank pulley. In my case if I even get the chance it depends on who produces the goods (IF they do): If MRC I'd like to do the former but if REVO then it will be the latter.
PS @RyanJonS4 - the 3.0 TFSI is internally balanced so the OEM crank pulley damper not any part of the need to balance the V6.
There are not many reports of OEM crank pulley failure but Doug at MRC wrote on one forum thread that he had come across at least one. Clearly the MRC pulley solves this risk because it is a single-part pulley, but then there's the matter of what is the residual risk of damage to ancillaries without the vibration damper. There are a lot of cars out there with oversize single-part crank pulleys and as far as I know no reports of problems that could have been caused by vibrations, but that doesn't prove that there is no risk, particularly over the longer term.
Seems to me that the solution is a bit like what we had with the DVs on the B5. Either upgrade with an oversize dampened crank pulley (I think the iABED vdamper is the only available option) or go with the undersize supercharger pulley and regularly check and replace the OEM crank pulley. In my case if I even get the chance it depends on who produces the goods (IF they do): If MRC I'd like to do the former but if REVO then it will be the latter.
PS @RyanJonS4 - the 3.0 TFSI is internally balanced so the OEM crank pulley damper not any part of the need to balance the V6.
The OE pulley has the damper for a reason.
https://en.wikipedia.org/wiki/Harmonic_balancer
This has got nothing to do with the internal balancer shaft which is trying to compensate for the vibrations caused by 1st and second order inbalances of a 90 degree V6 engine.
I would have thought the better idea would be fitting a lighter smaller pulley, rather than a heavier larger pulley on the crank.
https://en.wikipedia.org/wiki/Harmonic_balancer
This has got nothing to do with the internal balancer shaft which is trying to compensate for the vibrations caused by 1st and second order inbalances of a 90 degree V6 engine.
I would have thought the better idea would be fitting a lighter smaller pulley, rather than a heavier larger pulley on the crank.
Would be interesting what MRCs input on this might be. i want to go there to get my s4 mapped, will have to have a word with them reguarding this.
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