We are proud to release our RK520 supercharger conversion using fully custom made CNC machined parts.
We have incorporated a single piece billet aluminium crank pulley to incorporate both the oem crank pulley and the supercharger drive pulley as one unit for greater strength and more positive drive characteristics. Uprated fuel injectors are also included in the kit.
Cracking plenum gaskets is a classic & well known issue on force inducted M5's & an obstacle we were keen to overcome. This has been eliminated by the use of new CNC machined plenum plates as shown in the photographs.
Custom designed in-house Atmospheric blow off valves have also been used to overcome more issues, by using atmospheric rather than recirculating blow off valves like all other kits there is a minimal build up of excess pressure in the plenum when coming off throttle. Because atmospheric valves release pressure faster this gives improved throttle response and smoother running characteristics and also prevents the danger of pressure damage to plenum areas, all of which were major issues with previous forced induction kits available for the M5.
The other classic problem of MAF issues with force induction has also been eliminated by removing the MAF sensors in favor of an Alpha N style conversion. No piggy back management systems are used either as our custom software written in-house by our own software engineers works via the oem ECU specifically developed for this application.
PLEASE NOTE: We have developed software for both European and US spec vehicles.
Power increase is 120 - 150 bhp over stock ( dependingon condition of the existing engine ) using a single Rotrex C38 81 centrifugal compressor running 6.5psi with completely stress tested custom CNC billet aluminium bracket. This is based on an otherwise stock car with standard exhaust system and unmodified engine as our main objective during the design stages was to build a kit with 100% reliability and longevity hence the relatively low power increase and use of a single compressor.
NOTE: The dyno figures shown were attained on a conservative European dyno, this must be taken into account when comparing to other kits measured for example on Dynnojet dyno which are well known for reading high in comparison with other dynos.
The M5 enigine seems to have a "natural" maximum safe limit of about 550 bhp before possible failure of the standard internals, so we have purposefully limited power on this conversion to build in a saftey margin and also allow for extra tuning enhancements such as racing cats., performance headers and so on.
NOTES Regarding the listed dyno plot:
1.The stock engine's power prior to supercharging was 384 bhp, so our conversion has added + 107 bhp on the dyno; however a dyno fan can never replicate real world air flow cooling effects etc, so the intake temps on a force inducted engine on an average dyno run exceed those experienced on the road so the ECU restricts power as a safety feature, and consequently dyno figures are typically 15 - 25 bhp lower than on the street in the "real world".
2.Our dyno plot was taken on lowr grade 95 RON fuel, to prove the car still runs wel on this kind of fuel and also to show a "worst case" power figure. Expect another +15- 20 bhp on 97 / 98 Ron fuel.
Videos
1. M5 supercharged, 6th gear run (1.3Mb MP4)
2. M5 supercharged, off the clock 190mph+ (3.3Mb MP4)
3. M5 supercharged, external footage (13.3Mb MP4)
4. M5 supercharged, acceleration runs all gears (11.7Mb MP4)
PLEASE NOTE:
Due to the use and mounting location of an air to air intercooler the rear of the front bumper requires slight modification.
If your vehicle has other volumetric efficiency modifications such as replacement camshafts-bigger throttle bodies-ported heads etc we will need to write a custom map for your car on our racetrack. This will add an extra day to installation times.
We would advise using a stage 2+ or 3+ clutch with this conversion
