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Discussion Starter · #1 ·
Last week we picked up a 2015 Pure White GTI "S" model with the lighting package and a 6 speed manual transmission to use for testing and development. We'll be using this thread to document everything we do to the car.



Here is a picture of the window sticker showing the options this particular car has. Remember that fully loaded cars generally have a slightly higher curb weight which can affect performance. We have a MK6 GTI Autobahn Package customer with APR K04 and all supporting mods who's really struggled to get his car below 11.9x in the 1/4 mile and be competitive with some of the base model DSG cars because of the additional weight.



Sorry for the poor picture quality, but this shows the curb weight of our car @ 3135 pounds. This includes the 172 pound driver. We will be weighing the car every time we make a change and updating the thread accordingly.



After we got the car back to our shop from the dealer, it had roughly 41 miles on the clock and it sat in the shop for three days while [email protected] worked on making the retrofit harness and coding for the ROW LED tail lights.



One of the first things I noticed while driving the car home from the dealer was the gearing. It was instantly obvious that the gears were longer than our MK6 GTI. It felt more like a MK6 GLI to me, so when we got back to our offices we made an effective gearing chart for comparison between a few models. Remember, the 02Q transmissions have dual final drives. When you're looking at the chart below take note that lower numbers translate to a higher speed in that gear with the same tire circumference at redline. For example, it's possible to do 41 MPH in 1st gear on our MK7.



After the tail light work was done it was time to start working on baseline performance so we headed over to Summit Motorsports Park in Norwalk, OH. The car had 71 miles on the odometer when we got there and roughly 3/4 tank of fuel. This is still the original tank from the dealer, so there's a solid chance it's 87 octane.



We weren't sure what to expect for a result. APR ran 14.2 in their DSG car, mileage unknown on their car but I suspect it was higher than ours. Most cars are a little quicker after they have a few thousand miles on the odometer. Here are the best two passes from last night. The evening started out around 86 degrees and tapered to 80 by our last pass.




We're sure we'll be able to bring these down a little. Maybe into the 14.5x range. The Pirelli Cinturo tires don't hook very well. This is a good place to start for baselines though. Here are some more pictures from last night. We'll keep updating this as we make changes. Keep checking in.



 

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I was just skimming through this post and noticed that it was purchased from Collection VW of Hudson. What are the odds that I happen to be at the dealership for service when you picked this up??? It peaked my interest when I noticed the H.S. Tuning shirts for service that day but didn't think much of it. Now I realize that this GTI was being picked up by the guys at HS Tuning. Pretty Cool :D
 

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Discussion Starter · #9 ·
I was just skimming through this post and noticed that it was purchased from Collection VW of Hudson. What are the odds that I happen to be at the dealership for service when you picked this up??? It peaked my interest when I noticed the H.S. Tuning shirts for service that day but didn't think much of it. Now I realize that this GTI was being picked up by the guys at HS Tuning. Pretty Cool :D
That's funny! Do you have a MK7 as well? Hopefully nothing major while you were in for service!
 

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I already bought my mk7 gti but I absolutely love this thread. This can help a lot of ppl on making their final decision to buy it or not. Also how to mod. I had a gut feeling the 14.2 time from apr was a bit too fast anyway. mid to high 14's sounds more reasonable
 

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Discussion Starter · #14 ·
Sorry for being slow to get updates in this thread guys, I was on vacation for a week. The good news is, we got right back to it when I returned! It was important to us to know what kind of power the car was making before we made any changes, so we did about 15 dyno pulls in completely stock configuration with a full tank of 93 octane. The car has about 200 miles on the odometer now. After the baselines, we started making changes. First up was APR 93 octane software. We already knew what to expect from this upgrade thanks to APR's extensive testing but when it comes to testing things like performance intakes, downpipes, and intercoolers there is almost no reason to test a car with a stock ECU calibration. APR's calibration is awesome, and we'll get to that in the next installment. We had two intake systems on the shelf available to test: APR MQB Carbon Fiber and the Volkswagen Racing Cup Edition Intake.








Take a look at the chart below. I spent a few days sifting through all of the dyno charts and threw out any charts that had an odd torque spike or power dip. I overlaid four charts that were the best repeatable, consistent results we got with each hardware/software configuration. Since we were testing performance intake systems, it's important to note that it's incredibly difficult to replicate road going conditions in a dyno cell, and we do not have the super high volume/velocity fans that APR has in their dyno room. This does however give you an idea about potential increases even if tested in a "static" environment. Both intake systems showed improvements over the stock air box. It didn't look like that was going to be the case when we made our first few pulls, and it should be known that the factory box flows pretty well. It seemed like the ECU started to adapt to them after a handful of pulls, so we tested both intake systems twice. Unfortunately the APR Mobile dongle doesn't work on the Simos ECU's in the MK7's yet (I know they are working on it) we had to rely on VCDS for any data we could get. Again, the numbers on the chart are best repeatable consistent results. We expect better numbers after the engine has a few more miles on it. If the nice weather holds out, we'll be headed back to the track this afternoon with some slicks. :D



There are a few things you should know about each intake:

- The APR intake draws air from the factory location, the grill inlet.
- The carbon fiber housing encloses the pleated cotton filter, which creates a slight increase in sound at WOT but can't be described as "noisy" like some of the open element systems might be.
- The service life on the filter they use is great, they've proven to hold up incredibly well in their MK6 intake.
- It's obvious that APR spent a ton of time and effort developing this intake with their flow bench. Small turbocharged engines can have issues with compressor surge which is not good for your turbo and they went to great lengths to mitigate this issue. We're not trying to play favorites or pull punches with our recommendations but there is obviously a lot more R&D into the APR intake than VWR with regard to pressure/surging.


- The VWR intake uses a Trifoam filter. It's used pretty widely in the performance/motorsports industry. It flows well as a material, but it's made of Polyester and it's effectiveness drops more with age or heat exposure than cotton
- This intake produces a higher sound level than the APR intake. The open element design is likely the biggest contributing factor to this. Noise levels seem to be pretty subjective with our customers, so it's worth noting.
- The VWR intake has a heat shield system, and draws air from the engine bay.
- This intake seemed to produce some compressor surge where the APR system has almost no discernible surge. We obviously weren't able to check compressor wheel speed so it's tough to say whether there are any effects on the compressor speed with either system.

By the way, we usually carry both of these systems in stock. We'll be able to ship the APR systems by Friday (9/19/14) as they are coming off of a back order status. Order here:

http://www.hstuning.com/index.php?vpath=330_331

Keep checking in for more updates, we'll talk more about the APR ECU upgrade after we get some track times tonight and we have some goodies in store for the next few weeks! ;)
-
 

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Are those number all whp/wtq?
I would imagine that is whp as APR is advertising 320 crank HP. Unreal that with tune and intake only this little sub 3000lb car is make 300whp. It will be an absolute sleeper! So stoked to get mine. Subbed for updates here, great work guys.
 
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