$68 Pulley Upgrade DIY - Mercedes Benz SLK Forum

Performance MODS for the R170 Tuning and Performance modifications for your SLK

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#1 Old 08-15-2014
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$68 Pulley Upgrade DIY

I thought you guys would be interested in the pulley I built. This is being used on my Subaru rallyX build. So, I don't need to worry about the ECU codes that you guys may get from removing the OEM clutched pulley. This is only to show you guys another option for the pulley that won't break the bank on an older car. figuring out the ECU mods required is up to you guys. Enjoy...



I measure the O. D. of the face plates steel part that slips on the splined shaft. It was about 17.2 mm. I found out all Powerdyne pulleys are 17 mm ad pressed on design. So I found this site: 928 Motorsports - Porsche® 928 Performance Parts - 6-Rib Power Pulleys for Powerdyne, Vortech®, Superchargers

I did my calculations on what pulley ratios would get me right around 14,500 rpm on the M62.

These calculations are for my Subaru motor with a 5.25" crank pulley:
5.25/2.25=2.33333... pulley ratio.
2.333333x6250 rpm=14,583.333 SC rpm at redline.
14,583.333x1 (liter)x0.03531=514.9375 SC CFM
((514.9375-225/225)/14.7)x100=8.766 psi of boost on an EJ25.

So this pulley combo should yield 8.766 psi at the supercharger and approx. 7.5-8ish psi after my intercooler.

First, you have to cut the shaft cover off to make room for the pulley's position.


Next you have to grind down about .1ish mm off the faceplate portion that the pulley will press onto. (I forgot to take pictures.)

Then press the pulley onto the faceplate portion.


And the end result with extra pictures.
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#2 Old 08-15-2014
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OEM Pulley vs. Powerdyne Modded.

The OEM Mercedes 3.6"ish vs. the Powerdyne 2.25" supercharger pulley.
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#3 Old 08-16-2014
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would you be willing to make ones for users and sell them? if so i'd be interested
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#4 Old 08-16-2014
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I totally could make them. But you guys would have to send me your old pulley. Because the stock face of the pulley would be required for me to press the new pulley on. And you'd have to have the supercharger snout cover cut.

I'm going think it over. It would almost be better for me to have people send there whole supercharger to me and I'll port it and upgrade the pulley to hat ever size you want from the site in the post.
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#5 Old 08-16-2014
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WCFD2509,

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#6 Old 08-16-2014
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Quote:
Originally Posted by WCFD2509 View Post
I totally could make them. But you guys would have to send me your old pulley. Because the stock face of the pulley would be required for me to press the new pulley on. And you'd have to have the supercharger snout cover cut.

I'm going think it over. It would almost be better for me to have people send there whole supercharger to me and I'll port it and upgrade the pulley to hat ever size you want from the site in the post.
PM me if you decide to do it, i might be interested depending on price and your location
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#7 Old 08-17-2014
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He only has 5 posts so he cannot pm anyway, fyi
My post above should help him increase his post count to reply to pms.


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#8 Old 08-17-2014
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Quote:
Originally Posted by jbanks15 View Post
He only has 5 posts so he cannot pm anyway, fyi
My post above should help him increase his post count to reply to pms.
Thanks I'll update my profile today.

I know there is not really any pulley options under $200 out there for the M62's. Just want to share the knowledge.

I'll think about making some for other people.

jbanks, are there any rules to making pulleys for people through this forum I need o be aware of?
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#9 Old 08-17-2014
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No rules that we can see at the moment. If you were to be taking business away from a paying sponsor then yes.


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#10 Old 08-20-2014
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Thanks.

Quote:
Originally Posted by jbanks15 View Post
No rules that we can see at the moment. If you were to be taking business away from a paying sponsor then yes.
So to clarify,

Because I no official sponsors that I can find on this forum make custom pulleys similar to the one I created I should be good to go?

Thanks,
Thomas Mann
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#11 Old 08-20-2014
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At this golden moment, yes.
If the owners/management change their mind, you'll know it.


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#12 Old 08-20-2014
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Thanks!

Quote:
Originally Posted by jbanks15 View Post
At this golden moment, yes.
If the owners/management change their mind, you'll know it.

Thank a bunch!
Thomas Mann
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