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This profile was last updated on 8/21/14  and contains information from public web pages and contributions from the ZoomInfo community.

Engineering Group Manager Vehicle...

General Motors Corp.
300 Renaissance Center
Detroit , Michigan 48265
United States

Company Description: General Motors Corporation (GM) is engaged in the worldwide development, production and marketing of cars, trucks and parts. The Company develops, manufactures and...   more

Employment History


  • engineering degree
70 Total References
Web References
We'll admit there's little '69 Camaro ..., 29 Nov 2012 [cached]
We'll admit there's little '69 Camaro left in the Red Devil built by Mark Stielow (and currently owned by Jason Ayers, who kindly let us trash it for this test).
While the Red Devil uses out-of-the box suspension from Detroit Speed, Mark put his super secret tuneup on the shock valving using a shock dyno.
Most miraculously, Stielow has retro-fitted GM antilock brakes to the '69 using factory parts and a few custom items of his own, and he has it totally dialed. He says, "I've given away a lot of my secrets over the years--in my book, or in magazines, or for anyone who asks--but I'm not ready to give up the key to the ABS just yet. It took way too much work. It's my edge right now. Speaking of which, you do know the grossly unfair advantage here, right? Stielow is a GM engineer and has access to all the good toys and the most knowledgeable people.
Stielow had to outrun the ZL1's sophisticated Magnetic Ride Control suspension, where the shock damping rates are adjusted in milliseconds based on sensor input about the car's attitude on the track. Combined with advanced stability controls, independent rear suspension, and larger brakes than on the Red Devil (14.6-inch and 14.4-inch rotors) the ZL1 is a serious contender. The tires are 285/35ZR20 and 305/35ZR20.
Hrdp 1212 05 Built Vs Bought 1969 Chevy Camaro Zl1 The new car is claustrophobic compared with the old one; note the space between the dashes and the leading edges of the seats. Stielow tells us he prevents squeaks and rattles by putting Velcro strips between mating surfaces.
Our driver was Mark Stielow himself, plenty qualified thanks to years of seat time and wins at many Pro Touring shootouts. He's a driving instructor at the GM Milford Proving Ground. He has lots of experience with both cars and with the track.
But where would Stielow's allegiance fall? We asked straight out if he was going to sandbag the Red Devil to keep his job or soft-pedal the ZL1 to make himself look like a hero car builder. He swore he'd go "as hard as I can" in both cars.
First off, Stielow proved he wasn't going to cheat the ZL1 guys back at headquarters.
Stielow went 1:42:05, a significant 2:48 quicker. Perhaps weather conditions had something to do with the difference, but Stielow put down what's probably the quickest-ever lap in a stock ZL1 at GingerMan. While we won't say Chevy cheated-up our loaner test car, we'd be surprised if it didn't make sure to send us a flawless example.
But Red Devil won, posting a best lap of 1:39:58, slapping the ZL1 by 2.47 seconds.
We also tested 60-0 braking. The cars were amazingly close: ZL1, 107.4 feet and Red Devil 107.1. Stielow says, "It shows both cars have the same tires and good ABS."
While Stielow builds some of the most refined driving cars in the muscle-car world, they are still hot rods with hot rod quirks.
Meanwhile, Stielow tried to tell us the Red Devil could be built for around $100,000 in parts. We called BS, and he eventually admitted we weren't jerks for claiming $200,000 to $250,000.
Any Pro Touring fan knows Mark Stielow as the hero of the movement; he even claims to have named it. He also wrote the 212-page book about it (shown here), which you can buy at He's built Camaros often and well, so we've shown the progression of the famous ones here. He's also the man behind the Quadra-Duece (a heavily hyped, all-wheel-drive '32 Ford that, through changes of owners, was never completed according to Mark's vision), and his one Chevelle (Malibu)--a '64 called Malitude.
The Mule: Built in 2003, this was Stielow's most radical project, with its 1,000hp twin-turbo engine. It had relentless coverage in Popular Hot Rodding. Hrdp 1212 15 Built Vs Bought 1969 Chevy Camaro Zl1 The Mule: Built in 2003, this was Stielow's most radical project, with its 1,000hp twin-tu Hrdp 1212 16 Built Vs Bought 1969 Chevy Camaro Zl1 Camaro X: This one featured one of the first LS7 swaps, and a story about it appeared in HOT ROD in 2006. It was called X, as in the Roman numeral indicating Mark's 10th Camaro build.
The Red Devil came next and has since been sold, while Mark is off on another project yet to be revealed.
GM Program Engineering Manager Mark ..., 7 Mar 2013 [cached]
GM Program Engineering Manager Mark Stielow has been building hot rods for about as long as he's been driving and many of those cars have ended up on the covers of car-enthusiast magazines. His latest car to hit the cover of Hot Rod magazine is a Camaro called Red Devil. MORE
Dissected: 2014 Chevrolet Camaro Z/28 | Vickar Automotive Group, 11 June 2013 [cached]
Mark Stielow, the Z/28's engineering manager, explains that "the 19s are lighter, have less rotational inertia, and let us lower the car. The special lightweight wheels are 11 inches wide in the front and shod with 305/30ZR-19 Pirelli P Zero Trofeo R tires all around. Chevy tells us that these are the widest tires mounted on the front of any production car. A streetable track tire, the Trofeo Rs have a tread-wear rating of 60 and are manufactured in the same plant as Pirelli's F1 rubber.
The Z/28's suspension geometry is unchanged from the Camaro SS 1LE, but the spring rates are about 20 percent stiffer and the car uses Multimatic monotube shocks with F1-style spool valves. Stielow says this technology provides greater freedom to independently tailor jounce and rebound settings for low- and high-speed suspension motions.
Moreover, Stielow says that having more downforce in the rear than in the front enhances stability. There's even an accessory Gurney flap that attaches to the rear wing for more.
Unfortunately, all of this extracts a drag penalty. While the standard Camaro has a Cd of about 0.35, rising to 0.39 in the ZL1, the Z/28's is even higher. The aero appendages, the wide wheels, and the fender extensions add up to a car that "knocks a big hole in the air," as Stielow puts it.
Stielow wouldn't release any performance claims for the new Z/28, but it's safe to say that with stickier tires, better weight distribution, and a power-to-weight ratio only slightly worse than a ZL1's, the Z/28 will accelerate almost as quickly.
Mark Stielow, Camaro Z/28 ..., 1 Mar 2014 [cached]
Mark Stielow, Camaro Z/28 Program Manager Explains Media Blasting Wheels
Posted by: admin In: Main
As we showed you yesterday, Camaro Z/28 engineers had to come up with a creative solution to prevent the Camaro Z/28 tires from slipping on the rim during hard braking and acceleration on the track. In this video, Mark Stielow, the Z/28 Program Manager explains the solution - media blasting. View the video at the [...]
"We were told to build a ..., 14 Mar 2014 [cached]
"We were told to build a fast car - period," said Mark Stielow, Camaro Z/28 program manager and pro-touring expert.
"Media-blasting the wheel created an extremely aggressive grit on the rim, which finally got the tire to hold," said Stielow.
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