Radical Demon ! Koenig Turbo Merc R129 SL280
Compared to most R129 SL series seen on the road today, which have been kept in stock condition, this example here, owned by Peter since 2007, certainly marches to its own beat. The result is a modern classic that packs within it aggression, namely through its “Black Series-inspired bodykit” and twin-turbocharged engine pumping out 600 horsepower.
A self-termed pioneer, Peter’s SL280 was one of the first few in Thailand to be fitted with the Koenig wide body kit for the R129 SL. However, Peter was interested in following some modern styling trends, and inspired by the furious, aggressive look of the AMG Black Edition cars, hence, he tasked PTR Garage to create a customised bodykit add-on for his car.
Some of the more unique design additions include a rear diffuser inspired by that of the Ferrari 458 and an all-new mesh grille more likely to be seen on a new AMG than a refined convertible of the 90s. Now, who said you could not have two design ideals in one ride?
Such an exterior was more than enough to capture the attention of any passing motorist. However, Peter wanted his car to not just look the part, but also have the performance to match. As such, he decided to modify the SL280’s engine, so that in his words “the car would be both beautiful and strong”.
As for some mechanical talk. Fitted to this 2.8 litre straight six engine are two Greddy 517Z turbochargers, running at a whopping 1.8 bar each and enabling this engine to kick out 614 horsepower, which is more than a match for any modern AMG machine. The engine has also been beefed up in other areas, namely the thicker head gaskets, strengthened pistons, 1000cc Sard fuel injectors, Trust intercooler and Monza intake manifold.
For power just as aggressive as this SL’s exterior, Peter credited Por Motorsport for their efforts, as well as for capably taking charge of all aspects of the work, from the turbo piping to tuning the HKS F-Con VPro 3.3 ECU.
And stopping the car isn’t an issue with his Brembo 6-piston brake calipers hugging the 360mm disc at the front, and 4-piston brake calipers with 350mm at the rear. Supported by dual size gears of Manaray 11×19” sport wheels wrapped with Accelera PHI tyres 275/30 R19 fitted at the front, and Manaray 14×19” sport wheels with Michelin Pilot Super Sport tyres 325/30 R19 rolling at the rear.
However, Peter does not see his work on his SL280 as ending at here yet! Future projects would see him tweaking the Koenig wide bodykit to better in with that of the custom bodykit, with some help from PTR Garage, along with installing a motorised spoiler at the rear, similar to that seen in some modern super cars. Also in the pipeline is yet another strengthened automatic transmission.
By far the most important thing Peter learnt from this project though, was that contrary to popular belief, Mercedes-Benzes and European cars in general are tuner-friendly. While Peter admits that Japanese cars still hold the edge in terms of aftermarket parts availability, the Mercedes-Benz’s spare parts are not as expensive as one thinks. Also the straight-six’s reliability and high tuning margins make it a worthwhile contender for aftermarket modifications.
Owner : Peter Demon M
Vehicle : Mercedes Benz R129 SL 280
Power : 614 hp @ 1.8 bar
Workshop : Por Motorsport / PTR Garage
Country : Bangkok, Thailand
Mercedes Benz M104 2.8 Litre Straight Six / 1.2mm Thick Steel Cylinder Gaskets / Strengthened Pistons / GReddy 517Z Turbochargers x2 / Trust Intercooler / Sard Blow Off Valve / Monza Intake Manifold / Sitt Turbo Exhaust System / Bosch 044 Fuel Pump / Sard 1000cc Fuel Injectors / Sard Fuel Injector Rail / HKS Oil Pressure Regulator / HKS Filters / HKS F-Con V Pro 3.3 ECU
Koenig Customised Wide Bodykit / Customised PTR Front End, Side Skirts & Rear Bumper / Customised Ferrari 458-inspired Rear Diffuser / Customised Black Series Hood & Grille.
Mercedes-Benz Automatic Transmission Tuned By Peak Garage / Lorinser Coilover Kit / Manaray Sport Wheels 11×19” Front, 14×19” Rear / Accelera Tyres 275/30 R19 Front , Michelin Pilot Super Sport Tyres 325/30 R19 Rear / Brembo 6-piston Calipers Front, 4-piston Calipers Rear / Brake Discs 360mm Front, Brake Discs 350mm Rear
Defi Gauges / GReddy Profec B Electronic Boost Controller
Alpine audio system
[ Click picture to enlarge ]