what size supercharger pulley do I have?
 

Purchased my 2005 e55 with a few mods. I know my crank pulley is a 168mm renntech. I was told that the supercharger pulley was smaller but I was never given the size. I measured the outside of the pulley with my caliper and it reads approx 83.8 mm. Based on this anyone able to tell what size it is?

https://cimg6.ibsrv.net/gimg/www.mbw...7e1f844989.jpg

83mm

Your pulley combo equals a 180 crank or a 77 clutched sc pulley.

The most popular size going.

If it's get headers add a 77 pulley if your cooling is up to par and if you don't have headers, I advice long tubes over mids any day.That 168 and 77 makes a fun combo :)

83 is what I thought, was just second guessing myself.. Thanks guys.. Didnt know I could go to a 77 without fueling mods and a throttle body upgrade. Already have Mbh longtubes and a eurocharged Heat exchanger and a tune by OE.

You should have upgraded fuel injectors With the mods your running now. It should be your next mod if it hasn't been done. And you should have a trunk tank if you add any boost.

pulleys
 

77 vs 83.......how much difference in boost between the varying sizes?

About 1.5 psi

About 1.5 psi assuming the crank pulley is stock.

Theoretically.....(and this is purely a reference chart not taking into account all variances)

https://cimg4.ibsrv.net/gimg/www.mbw...38aa153a02.png

thanks for all this guys...this is what I have been looking for

77
 

Currently have evo sport headers, upgraded 010 IC pump.

Going on this week 5 piece pulley kit from UPD
77 sc pulley UPD
BWK UPD
PLM Heat Exchanger
Custom dyno tune by GSRTECHNIK

I was under the impression I did not need upgraded injectors for this set up but recently have been hearing some people say I do.

Do do I need upgraded injectors?

are you logging your important data?

What is the stock size SC pulley on the E55?

90mm

There is a boost matrix posted here

https://mbworld.org/forums/w211-amg/...ey-matrix.html

Thanks.