How James Clay Turned His E92 M3 into a Supercharged Screamer

James Clay car E92 M3 with a Supercharger

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David Haueter had a chance to speak with James Clay, the owner of BimmerWorld Racing, about the E92 M3, a BMW model that captured the attention of so many fans of automotive sports.

Ask any enthusiast what makes the E92 M3 special, and almost everyone will name the engine, a high-revving V8 derived from BMWโ€™s Formula One-inspired V10.

โ€œI love the engine in that car, and I donโ€™t think itโ€™s on the horizon forย BMWย to ever make a normally aspirated V8 engine like that again,โ€ says James Clay, who as the owner of BimmerWorld Racing has raced more than a few fast BMWs, including an E92 M3.

Thinking the car would be the last of its breed, he bought one for the road just before production ended. To make it extra-special, James Clay ordered his car in medium blue paint from BMWย Individual and with blue stitching on its black leather seats.

โ€œAfter going through the hundred or so colors that you can order fromย BMWย Individual, I decided to order Santorini Blue,โ€ he says. โ€œI took Performance Center delivery, and in the front room was this dark blue E92 M3. โ€˜Thatโ€™s cool,โ€™ I thought. โ€˜I wonder whoโ€™s getting that?โ€™ Then they told me it was mine!โ€

BMW E92 M3 under the hood

Rather than Santorini blue, Clayโ€™s car had been sprayed the darker San Marino, an M6 model color.

โ€œIt was too late to order another one, so it came down to take it or leave it,โ€ Clay says. โ€œIโ€™ve grown to love it, but it took me a while to warm up to it.โ€

Clayโ€™s E92 M3 was delivered in June 2013, and he started modifying it as soon as he got it home to Virginia.

โ€œIโ€™d already planned the basics, with wheels, exhaust, intake and suspension,โ€ says Clay. โ€œThe tricky part of being here [at the BimmerWorld shop] is that weโ€™re constantly working on developing new parts. This E92 M3 started to become a bit of a test mule, because we needed an E92 M3 to test parts on. Itโ€™s become a little over the top.โ€

BMW E92 M3 Wheel and Tire

The process may have been inadvertent, but the result is no accident.

For the last naturally aspirated M engine, a supercharger.

โ€œI wanted a car that makes me sweat a little when I drive it,โ€ Clay says.

Ironically, that meant boosting the naturally aspirated 4.0-liter S65 with forced induction. Clay installed a Roots-type supercharger that uses Eatonโ€™sย TVSย (Twin Vortices Series) technology, with twin four-lobe rotors and high-flow inlet and outlet ports. The kit was sourced from Harrop, an Australian company that builds superchargers forย OEMย applications.

BMW E92 M3 From the Side

โ€œThey really know what itโ€™s like to engineer something properly and get it to fit well,โ€ says Clay. โ€œThe typical issue on supercharging these cars is [getting equal filling of the cylinders]. Getting the plenum to direct air correctly on a centrifugal charger is critical, and having a Roots-type twin-screw charger takes away some of that problem. This type of charger is a perfect complement for the S65 V8, which doesnโ€™t have a lot of low-end torque. It develops boost at the low end, so it really reinforces the weak point of the motor.โ€

On the other side of the engine, Clay fitted BimmerWorldโ€™s own Tri-Y equal-length headers and freer-flowing exhaust system, also with the goal of producing more usable low-end torque.

The mods take power from 414 hp and 295 lb-ft at the crank to 465 hp and 350 lb-ft at the rear wheels, figures that Clay expects will improve as the engine accumulates more miles. A JB Racing lightweight flywheel and a Diffsonline limited slip differential (with the stock ratio) complete the drivetrain modifications, while a higher-volumeย CSFย radiator and coolers for engine oil, steering and transmission fluids ensure reliability.

Bigger brakes, stiffer springs

Stiffer Springs

The E92 M3 was built beforeย BMWย got serious about high-performance brakes, so Clay installed a Performance Friction (PFC) Z54 front brake package thatโ€™s nearly identical to the setup used in BimmerWorld Racingโ€™s E92 M3s. The kit replaces the stock single-piston calipers and 360mm rotors with four-piston calipers clamping 372mm rotors. At the rear, aย PFCย Z45 brake kit replaces the stock single-piston calipers and 350mm rotors with four-piston calipers and 355mm rotors. Allย PFCย components weigh less than stock, which reduces unsprung weight as well as rotating mass. So, too, do the 20-inch Forgeline GA3 6061-T6 alloy wheels, mounted with Nitto Invo tires.

Reducing unsprung weight improves handling, and so does a set of Hyperco springs rated three times stiffer than stock. Theyโ€™re used with Motion Control Suspension monotube dampers adjustable for rebound and compression (via a single switchable knob) as well as ride height. Ground Control front camber plates and an assortment of BimmerWorld suspension bits like bushings, bearings and arms complete the chassis upgrades.

Race-car fastโ€ฆand loud!

Clayโ€™s E92 M3 may look nearly stock, but a push of the starter button makes its extensive modifications evident immediately. Itโ€™s loud, race-car loud, and as I pull away from BimmerWorld headquarters I wonder if Iโ€™ll be able to endure it for the 140-mile drive to Virginia International Raceway for theย IMSAย weekend. This car was made for fast weekend drives, not long road trips, and you can pretty much forget about listening to the radio or hearingย GPSย instructionsโ€”or even talking with your passenger. (If you must subdue the supercharger whine, BimmerWorld offers a carbon insert that blocks the intake vent on top of the hood.)

E29 Interior

The car has ferocious acceleration to go with the sound, particularly in the midrange, and the prodigious power keeps the traction control working overtime. Even withย DSC, careful throttle application is required to avoid overwhelming the rear rubber exiting turns. And itโ€™s easy to get exuberant, since the upgraded springs and dampers improve handling notably without much harshness.

To get a feel for the speed of this car, itโ€™s best to find a long stretch of road, nail the throttle and hold on as the car rockets through the gears and the exhaust note goes into another dimension. When the experiment is over, the Performance Friction brakes provide great stopping power and pedal feel, though Iโ€™d need to make repeated hard stops to get a full sense of their capabilities.

As extreme as it is, Clayโ€™s M3 remains easy to drive around town, with tractable, user-friendly power delivery belied by its ear-splitting exhaust note. Again, though, it wasnโ€™t really built for civility, and to complain about the noise is to miss its essence.

โ€œAt the end of the day I love what it is, with its sound, power and handling,โ€ says Clay. โ€œIt could certainly be tamer, but Iโ€™m not taking parts off to make it tamer. Itโ€™s how I like it.โ€

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Rick Wilkinson

Hi, Iโ€™m Rick. Iโ€™ve been fascinated by cars since I could barely reach the pedals, and I turned that passion into a career. With over a decade working hands-on in the automotive industry, Iโ€™ve spent years learning what makes vehicles tick. Now, Iโ€™m here to share my knowledge and help my readers. Check out my articles!
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