VW Golf GTi Turbo Performance Upgrade
As of this writing, my Golf GTi is almost 13 years old, and although it is working fine, I felt it was about time for me to get a new car.... However, in order to purchase a new car that is much better, it would be a very pricey consideration. I'll let you in a secret - my dream car would be the new Renault Megane RS, a beautiful and very sporty hot hatch. Unfortunately, that will set me back an easy RM300K but that would give me a 1.8L turbo providing 280PS and 390NM of driving pleasure controlled via its unique 4-wheel steering system. Sadly, with a 5-year bank loan (I don't think I could get a longer term as I'll be retiring then), I'd be chained tightly around the neck for a crazy repayment of RM5K per month or more! That's like buying an iPhone 11 Pro practically every month!
So, I guess buying a new car was out of the question.... I could buy a 2nd hand car and do it up, but the thought of buying a used car and the hassle of going through the purchasing process irked me.... Then I thought, hey, I already have a used car - my current one! Yup, it's in very good condition, and I certainly know the owner's (me) driving habits.... So, why don't I just give it a boost in performance and maintain it the usual way, I reckon it could last for another 10 years, insya Allah.
Hence, instead of putting a down payment of RM30K for a new car, I'd used the same amount (well, around RM27K), to bring new life into my current car! The last time I did any performance modifications was over 10 years ago, and it made a lot of sense to follow through with APR Malaysia to inject the needed speed. Karl, who successfully did the Stage 2 mods the last time, recommended the following upgrades:-
- APR K04 Turbocharger system + OEM Bosch Injectors
- APR Intercooler
- APR HPFP High Pressure Fuel Pump
- APR K04 ECU software ugprade
- NGK Laser Platinum PFR8 B Spark Plug
Note: My VW Golf GTi is a 2007 2.0L Turbo MKV FSI. It already has the following mods:-
It took about a month for the parts above to arrive from USA after making the order, then Karl and his assistant Isaac plus technical team took around 4 days to install and test the entire system. Actually, it was supposed to take only 2 days, but there was a misfiring hitch that needed a while to troubleshoot, and was finally pinned down to one of the new injector being faulty, which Isaac replaced with a new and working one.
Also, a few other components needed to be replaced as they were discovered to be worn out, such as the cam follower, ignition coil pack, charcoal cannister, and air filter. By mid afternoon on 23 November 2019, all was completed and after a quick test drive, I was left smiling from ear to ear.
Mind you, before the installation, we had dyno'ed the car, to get a baseline of it's current performance stats, that is about 211PS and 314NM at the wheel, which is pretty good considering its age. A week after the installation, we did another dyno and the new output is a screaming 279PS and 386NM (on RON95 fuel)! Eat that, Megane RS...
Having driven my upgraded ride for a week, which included an outstation spin, all I can say is, "Wow!" Although I didn't do any 0-100 km/h test runs, without a doubt, not only is it significantly quicker and much more responsive, it does so with incredible smoothness with way less effort and it seems to be pulling strongly right till redline, where before it would run out of breath past 5,000 RPM.
Below are the before and after dyno charts. Notice that the K04 graph is very smooth while the before graph (incorrectly labelled "stock" as it really is "stage 2") shows a rather jumpy and unstable curve. That could be due to anything from old spark plugs to an aging turbo unit and certainly means that the new K04 system has been installed and tuned properly and is performing remarkably well. In any case, after 3,000 RPM, there is a sudden surge in power and torque with a total jump of about 68PS and 72NM from the previous setup!
You must understand, the standard, stock GTi is no slouch, so when Karl warned me that I must replace the existing braking system to a more stopping set (to be done another time...), he wasn't joking. I mean, this thing just rockets and doesn't seem to know when to slow down! Below 2,500 RPM it potters smoothly like before, but floor the pedal in Sport Mode, and you've unleashed a powerful beast bent on burning rubber on the tarmac, and leaving its stock rivals in a state of shock.... It's furious, unrelenting, and stupidly fast.
I like it.... very much ;-D
Enjoy the rest of the pics....