E92 M3 Pikes Peak Hill Climb Car
On the last weekend in June, 2017 we will be competing in our first ever hill climb event - the 95th Pikes Peak International Hill Climb in Colorado. A hill climb is just like a rally stage - a one-way race along a course with the winner being the driver with the fastest time. But Pikes Peak is no normal "hill". This course is 12.42 miles, 156 turns, on a paved asphalt surface, a starting line at 9,100 feet above sea level, and an elevation change of 4,720 feet (four thousand seven hundred and twenty feet)...
Our car for this endeavor is last year's E92 M3 Street/Track car project. That car started out as a typical used E92 M3 bought at auction. It was a little rough around the edges but underneath the scars of lease life there was tangible vitality. We bought the car to demonstrate what could be done with a modest budget to turn any E9X M3 into a formidable track car with some concessions for street use. On paper we sketched out a build that would be capable of lapping at the front of a typical race group and still be somewhat streetable at an all-in price of under $45k, including the donor car. With planning and a parts list already underway, we needed to shift course and build a hill climb car. Most of our new planning was to account for the extremes of the Pikes Peak event - the side effects of 14,000 foot elevation and the massive drops without guardrails. Many of the parts we used were carried over from the original build plan but several required additional upgrading or taken a step further. We needed to go beyond the usual track day prep to improve safety, cooling, and other areas. We began calling our project Weekend Warrior, Phase II (which then became P2 and finally P2, coincidentally the initials for Pikes Peak).
Here is our build:
However in our P2 build, we redefined optimal and went with a brake system comprised of Performance Friction 4-piston Z54/Z45 calipers and the latest V3 slotted discs. Lighter and stiffer than the factory parts (over 18 pounds in total), these are some of the lightest racing brakes on the market and will stop consistently at every turn, and inspire driver confidence (and looking over a cliff at 14,000 feet, BimmerWorld owner and Mountain Dummy James Clay upped the budget to provide as much of that as possible).
Engine and Driveline
We stuck to the standard formula for making power – more intake flow, less exhaust restriction, adapt software calibration and reduce parasitic losses. The Macht Schnell intake on this S65 is not only a great budget fit, but it makes big power also. On the exhaust side, we developed a racing center section with Magnaflow (which is now in-catalog) and added our Magnaflow-built Race Exhaust for maximum flow (and an amazing V8 exhaust note!) Epic race software pulls it all together with a custom calibration for 110 octane to reduce heat – a critical goal for the thin air.
The driveline was no exception when it came to shedding weight and reducing parasitic losses. We had Tilton produce a twin-disc Cerametallic clutch to pair with a JB Racing Ultralight flywheel for a streetable package that makes shifts fast – and drops 25 total pounds! A custom limited slip unit replaces the factory M-Variable option (details forthcoming after further testing – we do that part so you don't have to). Typical S65 maintenance was also carried out - new treated rod bearings, spark plugs, ignition coils, and fresh Red Line fluids throughout.
Wheels and Tires
For rubber, we have chosen the Hoosier A7 road racing tire in a 275/35-18 size on both axles. These tires quickly reach operating temperature (remember, no warm-up runs and it's a standing start) and will provide consistent grip throughout the entire 10+ minute run. If it happens to rain or snow (which it likely will), we will be prepared with Hoosier rain tires as well.
Roll Cage. In a dual-purpose track/street car we would limit the scope of this to a roll bar - a "back half" structure consisting of a hoop for rollover protection, back stays to keep it upright, and a harness bar to go along with your 4 or 5-point racing harnesses. For the P2 build we extended this to include the front half of this structure and specifically with additional rollover protection since, at Pikes Peak, leaving the road can mean tumbling a few hundred feet down the mountainside.
Harnesses and Nets. Building a Street / Track car? Schroth 4-point harnesses are designed to work without a rollbar to keep you from slipping around (and give additional crash protection). For track-focused cars with racing seats, a typical 6-point with racing seats is desired. Our Pikes Peak car goes a step further with a Schroth 7-point harness system. The 7th point carries the negative vertical load on rollover. Additionally, Schroth left and right side nets are added to keep the driver in the seat, and a window net to keep objects in their rightful place either inside or outside the car.
Fire System. Our Hill Climb car has a premium Lifeline Novec 1230 fire system because if it happens to go off track and catch fire, the chances of worker assistance are slim. A fire system was always on the budget build because we have seen a trend forming of such systems used on dual-purpose cars (not just race cars). This is a movement that we fully support and all future BimmerWorld track cars will have an integrated fire system. You have to ask yourself - what makes a dedicated track car any less likely to catch fire than a race car? Just because there's no rule book when building a dual-purpose car doesn't mean this vital safety feature should be skipped. Why should you or your passengers be any less protected? It shouldn't be from lack of understanding of fire systems in general or difficulty in installing a system that prevents you from including one. Educating our customers is the first step for a safer hobby. This ounce of protection goes a long way toward peace of mind.
Weight Reduction and Aero
In the spirit of escalation [or was that elevation?], we also substituted several carbon fiber pieces for their stock counterparts. Modifying the factory panels for lightness requires many man hours of prep and fabrication work. And the end result is still not as light or rigid as these carbon pieces. Since deleting the sunroof is de rigueur anyway, we filled in the void with one of our carbon sunroof delete panels. The doors and trunklid were also exchanged for carbon fiber. We're especially proud of these pieces as they are direct bolt-on with minimal prep required. To the doors we added Lifeline GT mirrors instead of reinstalling the swollen factory pieces. To top if off we exchanged the bulky factory dashboard for one made from carbon fiber. It has all of the same shapes and design cues as the factory piece but at a fraction of the weight. All of the instrument and control surfaces are flat which makes it easy to lay out your gauges and switchgear. Total weight savings from the carbon fiber bits was over 100lbs!
Shakedown / First Test: Summit Point
With the initial build complete we took it to an open track day at Summit Point Raceway in West Virginia for a shakedown run. There were no hiccups and the car ran beautifully the whole time. The additional weight reduction made the car faster with better handling and faster response. We can expect tight corners on the Pikes Peak course and Summit Point is a good place to get a feel for that setup with a mix of slow, tight corners and short straights.
Pikes Peak Livery Unveiled
Our Pikes Peak challenger has benefited from the assistance and input of these BimmerWorld technical partners: OPTIMA Batteries, MCS Suspension, Performance Friction, Eibach Springs, MagnaFlow Exhaust, Red Line Oil, CSF Cooling Systems, Epic Motorsports, Hoosier Tire, Lifeline, Schroth, HMS Motorsport, and Rogue Engineering.
Pikes Peak Race Week
Pikes Peak Race Week is underway! James Clay and the BimmerWorld E92 M3 have been practicing all week on different sections of the mountain, improving with every run. In James' own words, "The car is 100% solid and sounds 110% awesome." Hear for yourself with this Instagram video:
Photos from Race Week (click for more):
We will be posting more photos and videos all week on Instagram and Facebook. Here is a list of helpful links so you can follow the action -
Pikes Peak Official Web Page
Pikes Peak Live Timing (Class: Time Attack 1)
Pikes Peak Live Stream (on Sunday)
Product Highlights in our E92 M3 Pikes Peak Build: