Schlagwort: M54 | Hyde Motor Works

8 Rib Overdrive & Underdrive Pulleys for Classic BMW Engines

Beitrag veröffentlicht:April 24, 2025
Beitrags-Autor:Keith Caldwell
Lesedauer:4 min Lesezeit

We finally started production on the eight rib pulley setups. These pulleys are meant to replace the original 6pk pulleys and belt that drives your factory accessories.

If you have a supercharger on your car that is driven by the factory accessory drive belt, this upgrade is for you. If you’re supercharger is driven by a separate pulley mounted in front of the crankshaft, this belt setup will not work without modifications.

I’ll start with the more complicated crankshaft pulley. This is a pulley that we developed that fits over the factory M50, US S50, m52, s52 , m54 ( with 50 or 52 crank hub) This is the assembly that uses a crank hub and then the damper, trigger wheel, main pulley assembly bolts to the crank hub. It requires 2 mm of the front and rear fence of the factory pulley to be machined off. This can also work on the M54 if you swap the one piece damper hub assembly with one from the earlier crank hub that is separated from the pulley
damper assembly.

This is a single piece pulley, 1 58 mm for the main drive belt, and 1 17 mm for the AC compressor. The net overdrive of this pulley will depend on what size pulley is on the supercharger. Example, 66 mm supercharger pulley, the 1 58 crankshaft pulley will increase the drive rounded 21%.

Featured Supercharged Build of August 2023

Beitrag veröffentlicht:August 30, 2023
Beitrags-Autor:Main Editor
Lesedauer:2 min Lesezeit

This month’s Featured Build takes us to Calgary in Alberta, Canada! This wonderful 1995 BMW E36 Supercharged 318Ti was built by Mathew Schmor. Mat first reached out to us earlier this year, asking us of his intent to supercharge the stock 4 Cylinder BMW M42/M44 engine using the M45 supercharger found in the Mini Cooper.

We quickly settled on a V4 M.O.A.B. 500 Kit, which is based on the AMR 500 supercharger, as the WMD 45 kit that supports the M45 supercharger was not yet ready. The M.O.A.B. 500 kit produces just under 5 PSI of boost which translates an additional 40-50HP + to the stock engine. For a 4 Cylinder BMW engine such as the M44B19 or the M42b18, which hovers around the sub 150HP mark, this pushes it to the level of the 6 Cylinder variants nearing 200HP’s with a more aggressive power band.

“Well we had a successful Saturday morning including some challenges. AMR 500 is fully operational with 4 pounds of boost recorded. We did some short test pulls mainly rolling from 2000 rpm to 5800-6000 rpm second gear shifting into 3rd.

As mentioned before we live pretty high. This set up at Sea Level would probably be reaching closer to 5 pounds of boost.
Consistency hitting 4 lbs of boost. Closer to sea level this unit would really be something.

In reality I am hitting about 2.5 lbs of boost above stock and it is still making the car way more fun to drive and the noises make me grin.” – Mat

The car has been to the European Car show in Calgary, and the build was well documented on the 318Ti Forums.

For those interested in seeing a few videos, we have put up a small compilation with clips from Mat.

B.R.O.S.K. 1 – BMW Rotrex Supercharger Kit!

Beitrag veröffentlicht:Juli 21, 2023
Beitrags-Autor:Main Editor
Lesedauer:3 min Lesezeit

Our First Rotrex Centrifugal Supercharger based kit is now on it’s way! We introduce you to the B.R.O.S.K. – 1. Built specifically for the racers and car enthusiasts who like to take it to the Race Track!

Short for BMW Rotrex Supercharger Kit, B.R.O.S.K – 1 was developed in house by Mas Schandorph of Mas Motorsport Wiring (M.M.W.) in in Roskilde, Denmark. The B.R.O.S.K. – 1 supports the Rotrex C30 as well as the Rotrex C38 family of superchargers.

The projects development began in 2022 and was completed this year. To demonstrate its track ability, a total of 2 BMW E46 cars (Blue 325i and Yellow 330i) were built for this kit and then taken to the track!

After being track tested over a hundred times, this kit is now approved for production this fall. The B.R.O.S.K. – 1 is our highest power output centrifugal supercharger option so far M5x and S5x engines. With the smallest foot print yet, the robust design of the bracket system mounts in place of the AC unit, and brings forth the high efficiency and reliability found in the Rotrex brand of Superchargers.

Having a Supercharger on a BMW already is something special, but what’s more special here is unlike most centrifugal superchargers, the Rotrex line of Superchargers offer a low down linear power curve and raw torque figures, which comes close to the traditional Hyde Motor Works Roots and Twinscrew supercharger setups.

Below we showcase what very low boost figures can achieve with just the Rotrex C30 supercharger. Keep in mind, the power is measured at the wheels, which means the final engine HP figure is about 20% higher.