This story is the second in a series of articles on Detroit Speed and Engineering's new innovative QUADRA Link rear suspension system. For those of you who have seen Part 1, you'll recall that we are going to show you that great handling, performance, and ride can all exist simultaneously-something that the old timers said couldn't be done, and something that we are going to prove with the installation of a QUADRA Link. The plan was to take one of Detroit Speed's test and development musclecars and compare performance and handling characteristics before and after replacement of the old rear leaf suspension with their new QUADRA Link rear suspension system. We'll show through true direct comparison, after a carefully designed series of track tests, that we're not just blowing smoke. Let the testing begin.
For those who might have missed Part 1, here's a quick recap. The car we're using for the performance testing is a classic late '60s musclecar, the car that every baby boomer dreams of-a '69 Camaro SS (co-owner Stacy Tucker's beauty which she so willingly donated to this noble cause). For our comparison testing, we've equipped this beauty with a new 383 crate motor, Fikse 18x8.5 front / 18x9.5 rear wheels and Michelin Pilot Sport 245/40ZR18 front / 275/40ZR18 rear tires. In the first series of track tests, we'll pull down the performance numbers with the original rear leaf spring suspension installed. After completing the baseline testing, we will install DSE's QUADRA Link rear suspension system, and repeat the same tests with the same wheels and a new set of the same Michelin Pilot Sports for a true comparison.
The original game plan was to perform a quick, clean surgical strike by driving the Camaro over to a local Mooresville track, quickly set everything up, run our performance tests, and drive back to the shop. While at the track, we'd run a skidpad test to measure lateral acceleration (the number of g's reached before the end breaks loose), slalom and quarter-mile times-all true indicators of the car's performance and handling. We'd then return right back to the shop, install the QUADRA Link rear system, and return for the same series of performance tests. Easy stuff, right? Wrong!
As test time approached, the local track became unavailable. Normally this would not present a problem, but since this is a series of articles with a firm time commitment (that I so foolishly agreed to), we had to scramble. After about a half dozen phone calls, no luck in finding a track, and no confidence in our ability to find a suitable test facility, we finally found the test location that we needed. It was a little farther away than we wanted, but it turned out to be well worth the extra travel time. Thanks to the kind folks at the Laurinburg-Maxton Airport in Maxton, North Carolina, we could now get down to some serious business. The Maxton facility has a closed two-mile-long runway that dates back to World War II. This runway was used extensively up to and during the war to train glider pilots. It was certainly long enough, but there was a lingering doubt as to its condition. In the end, however, Laurinburg would prove to be a perfect location. The East Coast Timing Association (ECTA) uses this location each year for their speed trial events. On a warm, sunny North Carolina morning, we loaded the test Camaro into the trailer, pulled out of the parking lot, and headed to Maxton. It was a beautiful day; everything was going great and it only got better.
When we arrived at Maxton, we were greeted by airport management, given some guidelines to follow, and were then off on our own to run the SS through the tests. Our team quickly got down to business. To collect our performance data, we used a V-Box data logging system. DSE uses the V-Box system for all of the extensive testing and data acquisition that's done on its new products and systems. It's installed easily and logs data that can be downloaded to a laptop and then analyzed. The system we were using can measure the following parameters: acceleration times, braking distance, lap times, circuit position, and lateral and longitudinal forces.