Dyno Results for the 170PS and 184 PS VAG TDI's

[TDI-Tuning]

As part of our continued development program, TDI Tuning regularly undertakes testing sessions at a number of non-affiliated dyno centres in order to constantly improve and measure the outputs produced by our tuning boxes.

We thought you would be interested to see some of this occurring and have recently dyno’ed both a 170PS Audi TT Quattro and a Euro 6 184PS Golf GTD DSG.

The full write up and results can be found on our blog, but we also produced a video on the TT for you to watch which includes the before and after graphs to show how power and torque has increased.

 

 

 

 

[damianscott71]

Hi TDI Tuning,

 

Interesting video, thanks for sharing that with us.  

 

Just one quick question that I hope you can help with.... What's with the weird dips & peaks in the rolling road plot, after you fitted the tuning box?

 

Thanks,

Damian

[john_y]

Hi TDI Tuning,

 

Interesting video, thanks for sharing that with us.  

 

Just one quick question that I hope you can help with.... What's with the weird dips & peaks in the rolling road plot, after you fitted the tuning box?

 

Thanks,

Damian

Excellent question

[TDI-Tuning]

Hi Guys,

 

Thanks for your message.  Sorry, we've only just come accross this question.

 

Since the standard VAG 2.0 TDI 170 is often considered as "dull and flat", we specifically set out to build a tuning file for this engine in order to simulate the same punchy and aggressive delivery as experienced with the petrol equivalent whilst producing huge amounts of torque.  Typically, diesel vehicles flatten out and run out of puff after 3700 rpm.  The main objective here was to ensure the vehicle continued to pull similar to the petrol TFSI equivalent.  This type of map allows us to provide the vehicle with impressive fuel efficiency savings whilst ensuring that that vehicle has the ability to deliver huge power and torque should the driver demand high performance.  Ironically, although there is a significant spike towards the top of the graph, this is not noticed or felt when a vehicle is run on the road as the power and torque delivery is smooth and linear.  One of our R&D vehicles is an Audi A5 2.0 TDI CR170, this vehicle is exposed to an exceptionally hard life and put through its paces every day.

 

We test some our vehicles with low grade "supermarket fuel" in order to measure vehicle output should any customer run on such fuel (as we appreciate, a lot of drivers do run on budget, low grade fuel).  There is a very light flutter between 3750 and 4250 rpm which is caused by the low grade fuel.  However, when run on normal diesel from a branded fuel station, this light flutter would not be present.

 

Feel free to ask any questions.

 

 

Regards,

 

Steve

www.tdi-tuning.co.uk

[wja96]

Hi Guys,

Thanks for your message. Sorry, we've only just come accross this question.

Since the standard VAG 2.0 TDI 170 is often considered as "dull and flat", we specifically set out to build a tuning file for this engine in order to simulate the same punchy and aggressive delivery as experienced with the petrol equivalent whilst producing huge amounts of torque. Typically, diesel vehicles flatten out and run out of puff after 3700 rpm. The main objective here was to ensure the vehicle continued to pull similar to the petrol TFSI equivalent. This type of map allows us to provide the vehicle with impressive fuel efficiency savings whilst ensuring that that vehicle has the ability to deliver huge power and torque should the driver demand high performance. Ironically, although there is a significant spike towards the top of the graph, this is not noticed or felt when a vehicle is run on the road as the power and torque delivery is smooth and linear. One of our R&D vehicles is an Audi A5 2.0 TDI CR170, this vehicle is exposed to an exceptionally hard life and put through its paces every day.

We test some our vehicles with low grade "supermarket fuel" in order to measure vehicle output should any customer run on such fuel (as we appreciate, a lot of drivers do run on budget, low grade fuel). There is a very light flutter between 3750 and 4250 rpm which is caused by the low grade fuel. However, when run on normal diesel from a branded fuel station, this light flutter would not be present.

So it's nothing to do with the fact that the TT engine (unlike most other VAG CR170 engines)has variable valve timing and what you are seeing is the car swapping onto the alternate camshaft profile?

Because your tuning box only over-fuels you can't take this into account so you will always get a dip and peak. Or maybe it's supermarket diesel. Who knows?

How do you overcome the maximum fuel pressure controls on the CR pump?

[TDI-Tuning]

Hi wja96

 

The system is designed not to overfuel and you will see no excess smoke produced on the runs.

 

As it is twin channel it controls boost as well as fuel so does not "only over-fuel". The Supermarket fuel is likely to be the reason why the the curve is slightly rippled at the top end.

 

We do not exceed the manufactuer' s maximum fuel pressure.

[wja96]

Hi wja96

 

The system is designed not to overfuel and you will see no excess smoke produced on the runs.

Unless the car has a DPF delete you will not see ANY smoke from a TT TDi.

As it is twin channel it controls boost as well as fuel so does not "only over-fuel". The Supermarket fuel is likely to be the reason why the the curve is slightly rippled at the top end.

Sorry, but I don't buy that line of argument. There is no reason why the fuel suddenly leads to a drop in performance.

We do not exceed the manufactuer' s maximum fuel pressure.

How do you know? If you are intercepting the fuel rail and turning that signal up, when the car thinks it's running maximum fuel pressure you can actually be running higher than that and in my experience the only way to get the power over 210bhp is to raise the fuel pressure or fit bigger injectors.

[TDI-Tuning]

Unless the car has a DPF delete you will not see ANY smoke from a TT TDi.

 

The DPF will filter the majority of smoke particles from the vehicle, but if it was being heavily overfuelled as suggested then it would not be capable of stopping everything.

Sorry, but I don't buy that line of argument. There is no reason why the fuel suddenly leads to a drop in performance.

 

We are referring to the flutter between 3750 and 4250 rpm That is not a drop in performance.

How do you know? If you are intercepting the fuel rail and turning that signal up, when the car thinks it's running maximum fuel pressure you can actually be running higher than that and in my experience the only way to get the power over 210bhp is to raise the fuel pressure or fit bigger injectors.

 

All common rail systems are fitted with high pressure release valves that will open if an unsafe pressure is reached. Our systems are set so that pressure is increased within the rail but does not reach a level that causes the release valve to activate.