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martziniuk

MRC and the dual pulley setup

There's been a lot of talk on the US forums about running a dual uprated setup, i.e. crank pulley and supercharger pulley. I know MRC use a crank pulley but does anyone know if it's a solid pulley or does it have rubber/silicone voids in it to stop and vibrations?
Does anyone know if they have any plans to make software for this setup?
Graham

What is the concept of upgrading both please?
Geoff A

How much more boost can the dual pulley swap create? And what about intake temps and heat management? There must be a limit to s/c intercooling capacity.
martziniuk

You basically get a lot more boost which creates more torque throughout the Rev range. The supercharger seems to be holding up to the higher RPM so far.
dream3r

martziniuk wrote:
You basically get a lot more boost which creates more torque throughout the Rev range. The supercharger seems to be holding up to the higher RPM so far.


I wonder what the IaT's were.
Doug

you don't run more boost if you go too extreme - the charger will max out what it can flow - we have 3 pulleys-  racepulley which is same as replacing a charger pulley. high torque (which most have) pulley which spins more than a supercharger pulley can - and the silly pulley that just fits but you need to machine a small web off the block so belt doesn't rub. This is on the 2 test cars with waer injection. It gets hot and needs the coolers, wi and higher octane fuel to keep it safe.
dream3r

Doug wrote:
you don't run more boost - the charger will max out what it can flow - we have 3 pulleys-  racepulley which is same as replaceing a charger pulley. high torque pulley which spins more than a supercharger pulley can - and the silly pulley that just fits but you need to machine a small web off the block so belt doesn't rub. This is on the 2 test cars with waer injection. It gets hot and needs the coolers, wi and higher octane fuel to keep it safe.



Nice I think I'll have to get a stage 2 pull when (self tuning my car).

I'll have a look on your site to see if yo do them separate Doug.
dream3r

martziniuk wrote:
You basically get a lot more boost which creates more torque throughout the Rev range. The supercharger seems to be holding up to the higher RPM so far.



So apart from the boost side as Doug mentioned, it sounds like a worthy fitment.

I'll see how much it costs up here in the NE
martziniuk

Doug wrote:
you don't run more boost if you go too extreme - the charger will max out what it can flow - we have 3 pulleys-  racepulley which is same as replacing a charger pulley. high torque (which most have) pulley which spins more than a supercharger pulley can - and the silly pulley that just fits but you need to machine a small web off the block so belt doesn't rub. This is on the 2 test cars with waer injection. It gets hot and needs the coolers, wi and higher octane fuel to keep it safe.

Are your pulleys available for sale without a tune?
dream3r

martziniuk wrote:
Doug wrote:
you don't run more boost if you go too extreme - the charger will max out what it can flow - we have 3 pulleys-  racepulley which is same as replacing a charger pulley. high torque (which most have) pulley which spins more than a supercharger pulley can - and the silly pulley that just fits but you need to machine a small web off the block so belt doesn't rub. This is on the 2 test cars with waer injection. It gets hot and needs the coolers, wi and higher octane fuel to keep it safe.

Are your pulleys available for sale without a tune?


Seems to be in their site matey
Doug

stock, race , high torque, and the big one

Challice

Will these not cause negative effects as they are not damped pulleys?
martziniuk

Certainly worth thinking about the crank pulley, especially as some cars with the supercharger pulley upgrade are seeing their OEM crank pulley fail.
Doug

There have been a few stock crank pulleys failed. These are only 500bhp and rev to 71000rpm so nothing big power. We use a damped mass insert in the supercharged R8 crank pulleys over 700ps but they rev to 8500 as well.
Chiefbadger

Any closer to cracking that pesky Simos 16 ECU Doug? Ben mentioned that there was progress being made pre Christmas.

Cheers,
Ols
Doug

I am positive we will have Simos16 soon.

This is the s4 on the biggest pulley maxed everything out - the highest power one I think we have done - Water injection tests this weekend/next week.

https://www.youtube.com/watch?v=UGIllRlwAmc&feature=youtu.be
ChrisMB

Dual Pulley

Someone correct me if I'm wrong...

The US forums have been getting all excited about the idea of using a larger crank pulley.  And then some of their threads have ended up as wars between damped/undamped and different tuner's.

MRC have been using a larger crank pulley for years.  Unlike the US tuners, MRC do the 'stage 2' tuning by using a larger crank pulley rather than a smaller supercharger pulley.  And of the various MRC crank pulleys, the 'high torque' one is what's included in the stage 2 pack and on most of our cars.

On the US forums the main concern with dual pulley seems to be overspinning the supercharger.  They reckon its limit is 23,000RPM.  So depending on pulley combination and what the redline is (gearbox tune) it might be getting close.  On the US forums someone made a table with all the pulley size combinations and supercharger RPM, but didn't include the MRC pulley.

So for us to be doing the dual pulley idea of the US forums, we'd be wanting to fit a smaller supercharger pulley (as we've already got the larger crank pulley).
Dippy

Doug wrote:
I am positive we will have Simos16 soon.


That's good to hear. How much longer will you need after stage 1 to get your stage 2 package ready? I assume getting a batch of new bolted pulleys made is fairly trivial for you?

I doubt I'll bother getting stage 1 first - I'd prefer to wait and go straight to stage 2.
buzzard

Do the b8.5's have the same box mechatronic unit as me Doug ???
Doug

buzzard wrote:
Do the b8.5's have the same box mechatronic unit as me Doug ???


yes but you have different gearing - that is why you have a mix/match gearbox file.
buzzard

Doug wrote:
buzzard wrote:
Do the b8.5's have the same box mechatronic unit as me Doug ???


yes but you have different gearing - that is why you have a mix/match gearbox file.


One off then :-/
That is why it's so hard to write a map for my setup.....
Dippy

Re: Dual Pulley

ChrisMB wrote:
MRC do the 'stage 2' tuning by using a larger crank pulley rather than a smaller supercharger pulley.

I hadn't realised that - I thought it was the s/c pulley that was changed.
laurent21

I've got the stage 2 from MRC but in France, through KSF Motorsport, I know they changed the crank pulley, but I have no idea which one they put instead. I was never asked. Does someone has an idea which one I got ?

Thanks !
Doug

All cars will get the high torque pulley - middle black one. Any that were tracked might have got the smallest one - the grey - the A6 C6 gets the small one as larger don't fit without cutting a web off the block. A6 C7 gets the black high torque.
laurent21

cool thanks Doug ! Do you still sell MRC stickers to replace the "S5" one at the back ?
Also, I've been asking KSF in France about something but they have not been able to answer me : I find that my oil temperature is a bit high sometimes, and higher than other S4/S5 (V6T of course), and we've looked and there isn't any oil radiator/cooler in mine. Is there a way to add one, or improve the oil exchanger that is already in there, which seems a little bit small for such a car?

Anyway thanks for your time.
dream3r

Doug wrote:
I am positive we will have Simos16 soon.

This is the s4 on the biggest pulley maxed everything out - the highest power one I think we have done - Water injection tests this weekend/next week.

https://www.youtube.com/watch?v=UGIllRlwAmc&feature=youtu.be


I may be able to help depending on what you still need
Nez

Any updates on this Doug? Really interesting on this stage with water injection....
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