Finally another track day at BIC on 20th April, organized by our club. 20 Cars, 2x30 min session Took the VRS out and posted an insane time of 2min 40sec (3rd Fastest of the day)in 35 degree heat. Very impressed with the improvements from Stage 2. I was only 4.5sec slower than the fastest car (Audi R8 4.2V8) which is damn good for a 1.8TSI enigine running stock turbo.
Couple of Shots from the Day-
Videos are posted on the Motorsports section of tbhp.
Noticed a few issues related to performance on the track and got cracking on solutions:
1. Boost Response is terrible and to power out of corners I need to be a gear lower and in the high rpm range. The culprit was the stock BPV and found it leaking boost up top in the RPM Range.
Solution- Upgrade to GFB DV+. Keeps the response of the electromagnetic bypass valve, with better boost holding ability.
Very very impressive modification and honestly one of the best things I've done to the car. The car now holds full boost till redline, and the throttle response improvement is amazing.
2. The turbo seemed to be struggling a bit on the track. Could feel it in the car, so decided to check the pipes from turbo to intercooler and throttlebody and what i saw amazed me. What a terrible piece of engineering.
Solution- Upgraded to Spulen Boost Pipes.
Comparison - Stock vs Spulen Turbo Outlet Pipe
Comparison - Stock vs Spulen Intercooler to Throttlebody Pipe
Results is again amazing! The car has gotten even smoother. The power comes on instantly. Very little turbo lag. The turbo also seems to be working less harder to reach peak boost. Power levels also feel increased, and the boost is coming on earlier and smoother.
We have another track day on the 4th of May, so will put these mods to the test.
Another couple of things I noticed where improvements are needed.
1. Brakes. Definitely improved with the front pad changed to tarox and a fresh set of OEMs in the rear. But still the brake discs and calipers leave a lot to be desired of. Fade is evident and I was going easy on them on the track loosing time due to carefully braking so as to not overheat the calipers/pads or warp the rotors. Call me spoilt, but I've gotten used to the Brembos on the Evo's and STIs and the OEM brakes on the VRS just wont do if i have to break into the 2.30s at BIC. I suppose with better brakes i can brake a lot later and a lot harder than I was this time, so roughly 0.5 secs gain is assured on each corner, and BIC has 16 of them, so roughly another 8 secs to be gained. So either Tarox or Brembo upgrades next on the list.
2. Intercooler. While doing the pipes, I was shocked to see how small the intercooler is. The core is big but the depth of the intercooler is puny and is definitely another choke point that will need to be addressed. The easiest solution is to replace it with the Audi S3 intercooler which is far superior and barely 350 Euro. Definately worth the investment if I'm going to track the car and keep IAT's stable after 10-15 laps.