Posted by Carl Araneta on 21st May 2014
When we decided to perform this build, our goal was to use everyday parts available to our customers and viewers, and perform real world tests to see if the gains were not hype. So when we decided to install the Eurocode front and rear swaybars and links, what a better way to test the gains of these than on a slalom course.
We started this test by creating as close to an identical scenario as possible throughout the tests. This meant we were running the same wheels and tires, the same tire pressure, on the same road with the same spacing between the cones on the course, using the same driver (a novice grassroots motorsports racer, but somewhat experienced in amateur road racing and autocross), and lastly as close to the same ambient temperature as possible. We had already installed the Eurocode Alu Kreuz brace prior to this test as well as a brand new set of 19” Neuspeed RSe10 wheels on 255/35ZR19 Michelin Pilot Super sport tires. We set the tire pressure to factory settings and performed an inspection of the suspension components. We found that although the upper control arm bushings did show wear as expected on a car with 53k miles on the odometer, they had not torn and were still usable through this portion of the test. Everything else was in great condition.
We found an isolated patch of road near our location where we could safely perform these tests and set 4 cones at 75 feet apart. Why did we decide on 75 feet? When looking at SCCA solo autocross rules, we found they can vary from 60 feet apart up to 100 feet apart depending on the course layout and space permissions for the course. We didn’t want to have an exit speed nearing triple digits as we were testing on a public roadway and therefore felt it was only appropriate we set our course up somewhere in the lower middle of those 2 numbers.
Our first test event was a warm evening with ambient temperatures at 89 degrees and no winds. We made many passes back to back as we continued to achieve the maximum possible speed out of the slalom course. The best trap speed we had successfully recorded was 58 MPH. This was a push for the car as there was noticeable body roll and a sense of disconnection to the road. However, during our testing, we inadvertently began to experience the car pulling back power. Near the end of our attempted passes, it had become impossible to even match our fastest trap speed of 58 MPH. It had become clear the stock supercharger heat exchange unit was not up to our tests. Lucky for us, we already had an APR Coolant Performance System (CPS) on order. And with the sun beginning to set, we called it.
Watch video below.
Now was time to install the Eurocode swaybars and links on the car. Installation is very straight forward and simple. Because we want to experience the biggest improvements on the car it was only expected that we not only install the Eurocode front and rear links with the bars, but we needed to set the preload on them as well. We could have followed the supplied instructions and set the length of the links to match that of the stock links since we had not yet lowered the car. But again, we wanted to get as much improvement with them installed as possible. That’s where the preload setting came in. We loaded the drivers seat with enough weights to match the driver, and proceeded to equalize the load/weight the bar was pushing on each side using our corner balancing scales. During this install we decided there was no better time to install the APR CPS kit that had come in just days earlier and test its worthiness on the next test event as well. The APR CPS comes with a detailing installation instruction manual and is a very straight forward install. However we don’t recommend this install be performed other than by an experienced Audi technician because there are some more specific bleeding techniques of the cooling system necessary for the CPS to perform as advertised. Lastly while we have the car in the shop, we reset the tire pressures and re-inspected the rest of the suspension system. Everything checked out the same.
We setup our slalom course once again on the same patch of road on an evening but this time ambient temps had risen to 94 degrees and there was no wind. Again, we were attempting maximum trap speed coming out of the slalom but with the new upgraded Eurocode parts. Immediately we noticed that the 58 MPH speed was easy to reach and surpass. And to our satisfaction, run after back to back run did not affect the performance of the car despite the increased ambient temperature. It was very clear the APR CPS was doing it’s job and we should be able to increase our trap speed out compared to the first test. After several attempts the fastest we recorded was 62 MPH. That’s a gain of 4 MPH. While this may not sound like much, let’s remember the rest of the suspension components are still stock and we are clearly pushing them beyond their threshold. Even when considering a component to increase horsepower, while a Dyno may show gains, in terms of 1/4 mile track times, the reduction in the run time is minimal as well. This test clearly showed that the upgraded Eurocode sway bars, tuned to the car and driver with the matching Eurocode adjustable end links, was a very useful improvement on the suspension of the car and recorded gains. Lastly, the feel of the car was dramatically improved. Why, because we could feel a better connection to the road with the car and our sense of confidence in the cars’ ability to hold to the road was stronger.
Watch video below.
Stay tuned, as we finish this test by installing and tuning a set of Bilstein B16 coilovers and SPC adjustable upper control arms.
Last week we installed APR's CPS (Coolant Performance System) on our project car, the Audi S4. The Problem: OEM Supercharger Cooling System While the heat from compression must be cooled prior to entering the cylinders, the supercharger cooling system struggles to keep up the pace with the increased power of more aggressive driving. Hence, the OEM supercharger [...]
Yesterday we posted a YouTube video showing performance gains after installation of the Stage 1 & 2 Carbonio Intake on our Eurotek Project Car, the Audi S4.Audi Performance Part: Carbonio Intake The Carbonio Carbon Fiber Intake 3.0 TFSI kit is suitable S4 & S5 models with Stage 1 and Stage 2 modified engines all the way [...]
EuroGEAR Carbon Fiber Splitter & Valance for our Audi S4 It's really all about the fine details and nuances that make the process of building a project car an art. One perfect example is our latest addition to Eurotek's project car, the 2011 Audi S4. We recently received a Carbon Fiber Splitter and Valance from EuroGEAR. EuroGEAR [...]
A few weeks ago, we received our P3 Cars Vent Integrated Digital Interface and installed in on the Audi S4. It’s true what they say out there, this little gadget is an amazing addition to the ride. Here’s why: First of all, the installation is extremely easy. It’s designed for Plug and Play, with the average install time taking [...]
One week after purchasing our newest Eurotek Tuning Project Car, we’ve already begun the build for the 2011 Audi S4 S Tronic.Performance Upgrade: APR Stage II+ Tune First thing we did was implement an APR Stage II+ Tune.This ECU Upgrade is available through the OBD-II Port via APR’s patented DirectPort Programming, resulting in faster acceleration, improved throttle response and [...]
(Flying to Los Angeles to pick up our Audi S4) (Audi S4 at the Dealership) Eurotek Tuning’s Audi S4 With two of our cars recently sold, we set out to buy a new Eurotek Tuning project car. Eurotek Tuning is excited to share with you our current build. The past few weeks, we set out to purchase an Audi S4.Without luck [...]