Big 1.8T tuning project: Our test golf achieves 700 hp!


Foto_5 Foto_4


In 2005 the BAR-TEK fleet was increased by a Golf IV GTI 1.8T. It should be a 1999 AGU with 150 hp. This 1.8T engine was one of the first 20V (valves) built by VW on the market to replace the successful G60 G-Lader series. The AGU engine belongs to the still quite "simple" and "stupid" engines, because it has no correct boost pressure control. This means that the engine control has no boost pressure sensor to control the actual boost pressure. Instead, the entire control system is controlled by the susceptible air mass sensor. The 1.8T AGU engine has the better connecting rods and large intake ducts in the cylinder head without variable valve timing adjustment (VVT).

Before we went to the tuning of the 150 hp engine, first the usual sources of errors were excluded:


1) The first 1.8T tuning project:

You can also buy the built-in parts in our 1.8T tuning kit stage 1. So you have everything matching each other in one set.

2) Tuning project number two: Some upgrades it should be!



KKK04-001 RS turbocharger ready for installation.
After each tuning stage we have a performance measurement
on the dynamometer to see the end result for ourselves:






Conversion to R32 bumper was not only a visual eye-catcher, but also necessary to accommodate the large EVO intercooler.




Comparison between K04-001 and Garrett GT28RS turbocharger.


3) Third 1.8T Tuning Project:

We continued with the conversion to the first Garrett GT28RS turbocharger. This upgrade showed why a conversion to a Garrett turbocharger makes sense, but is also expensive. Because the Garrett Turbo is in a different position than a KKK turbocharger, all connections are also different. The upgrade kit contains the appropriate oil and water lines, and the downpipe is also exactly right for any 1.8T with transverse engine. Also the intake kit fits relatively well, only the new 90° hose which is attached to the turbocharger had to be shortened a bit. No problem yet, but the exit from the turbo to the intercooler had to be completely re-welded and adjusted by the new position of the turbo. Also the hoses of the N75 as well as of the SUV (blow-off valve) had to be newly manufactured. At the end of the day a lot of adjustment work was necessary, but the work should also be rewarded. We have measured almost 300 hp with the GT28RS, whereby we had to state on the dynamometer that the original fuel pump did not bring sufficient output volume. With a new pump there would have been more for sure. We installed the following components with the kit:


Stage 4 Turbokit consisting of:

    In addition, these components were used:

  • EVO intercooler (very good inter cooler, intake temperature never rose above 40°C)
  • SEM intake manifold with heat seal from New South Performance
  • Software adapted for GT28RS Turbokit
  • Oil cooler kit with short oil filter

In addition with the SEM intake manifold we also installed a 70mm throttle valve from the VR6. Unfortunately we had constant problems with the basic adjustment of the throttle valve. Also the exchange of the complete throttle valve did not bring any success. Constantly the error occurred that the lower stop of the throttle valve cannot be calibrated and in idle the engine ran unclean. We would recommend a conversion to a larger throttle only from a power of 400 hp upwards, preferably together with the electronic accelerator pedal without throttle cable as on the Golf 4 R32. However, the complete bracket for the throttle, clutch and brake pedal must also be replaced during this conversion.



4) The fourth upgrade was serious: the Golf gets a racing engine

We then used the 2011 winter break to completely remove the engine. We would have had to replace the connecting rods from a power output of 300 hp upwards, so we modified the whole engine immediately. Our goal was to build the engine as stable as possible, because we didn't want to take any risk of getting an engine breakdown. In addition, the fuel supply was directly large enough to drive with E85. E85 has many advantages with turbo engines: better knocking characteristics due to higher octane number, more pre-ignition possible and therefore more engine power, better cooling effect and less deposits in the combustion chamber.

Our racing engine was used with the following components:





5) After the fifth tuning project up to 700 hp!

Now it went again a stage further with a Garrett GTX30 turbocharger.

The only change in the interior of the engine were the pistons, because we had to reduce the compression to 8.5:1. Since we "cheer" the engine with E85 (bio ethanol), we did not have to go further down to 8.0:1.

Further parts, which were assembled:

As a final result after the fifth tuning project we could measure a full 700 hp in our 1.8T test golf!

We continue with the next level 6 on Garrett GTX35 Turbo!



Our test Golf in the "VW Scene" in May 2013.
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