Wassereinspritzung beim TDI | Posts 48+

[color=red]The specific fuel consumption and the engine's performance characteristics remain dependent on...
the water injection system remained largely unaffected[/color],

[color=#444444]Hello, diesel enthusiasts.
It seems like there was nothing wrong with the 'water tuning' .

Best regards, Chrigu[/color]

Hi everyone,
I tested the WAES additive with and without alcohol (on a GOLF IV TDI PD with 100 horsepower!). Fuel consumption: approximately 200 km on 3 liters of water-alcohol mixture.
No performance improvement observed!
Let's see what WAES has in store for us this summer!

Hello everyone,


Okay, now I'd also like to add my thoughts on the matter, hoping it helps provide some insights based on experiences with WAES.



I have been using a WAES system for a year, primarily with methanol.
I drove approximately 30,000 kilometers this year.
However, I must say that I purchased the entire fuel injection system without experimenting with the injectors, pump, fuel flow rate, etc.




Regarding performance: Driving with water in the tank = no noticeable difference.
Average fuel consumption increased, now 6.5 - 7.5 liters per 100 kilometers.

Trips using a 50:50 water/methanol mixture.
Clearly noticeable performance gain.
Average fuel consumption: approximately 4.5-5.5 liters per 100 kilometers.
(with the same driving style as with water)

Trips using ethanol (denatured alcohol) 70:30.
Performance increase is slight.
Average fuel consumption: approximately 5.0-6.0 liters per 100 kilometers.

To analyze this rough calculation, I used my usual commute route (country road/highway). The values may not be perfectly accurate, but I think they provide a reasonable estimate.

The system operates via an electronic control unit, which is connected in the same way as, for example, an LDA (Linear Drain Assembly).
The injector was installed directly in the last 90-degree bend before the EGR valve (engine is an ARL).
It is very important to have a check valve in the pump's supply line (to build up pressure in the water tank). A manual on/off switch inside the vehicle is also necessary. It would be very problematic to start the injection system when the engine is cold. This would create oil sludge in the engine compartment, which is very unhealthy. Therefore, always warm it up first, then turn it on.
One more thing about fuel consumption: I installed a 10-liter tank in the trunk. It has a range of approximately 600 km when driving on highways.
Approximately 500 km on the highway. So, quite a distance! I can live with that.

In April of next year, I plan to visit a dynamometer and, if there's interest, I'll post the data here. I'm also planning to write about 'AU' because it's an interesting topic, and I was already due to write something.

I also have pictures available if you're interested.



Best, Marv.

Hi Marv,

Thank you for sharing your experience. However, there must be residual oxygen present for methanol to be oxidized, and this contributes to a greater "bang" or explosive effect.
Otherwise, driving with water would also have resulted in a performance increase.

Why not simply increase the diesel injection amount when driving at full throttle?

Best regards, Rainer.

The constant refilling is simply too expensive - I would rather recommend a more subtle chip! That's my opinion...

Yes, I have to admit that it has its pros and cons.

Regarding the constant need to refill, that also bothered me. That's why I built a large tank. The original 1.7L tank was a joke...
I'm doing very well with it. I completely refill it 2-3 times a month. Since there's a level indicator, I don't experience any surprises. And if you're ever in a pinch and run out of liquid, you can simply use water.


Okay, here's another testimonial from the summer season...

Situation on the highway: driving quickly, then suddenly a traffic jam... (Outside temperature approx. 30°C). At first, I thought my engine's auxiliary fan was broken. It didn't turn on for 10-15 minutes. Then, more frequently due to the stop-and-go traffic.

A few days later, I experienced a similar stop-and-go situation, but this time without the WAES (I had a problem with the fuel tank). The fan immediately turned on, and the intervals for the air intake were longer. From this, I conclude that the engine was, overall, hotter than with WAES, especially since the average fuel consumption increased to 8.5.


Conclusion: In my opinion, active cooling is beneficial for the engine, especially during the summer months.