Recently I done some tuning development work on a S4 TDI DEWB 347hp/700nm
Test period - January with air temp around 6deg
Modelled shaft speed 170k
Lambda 1.08 from 3.2k to 4.4k rpm
2.4bar boost 2.1k to 3.7k rpm
Peak shaft speed (actual measured) - 159k
2500bar rail pressure
As this was tested in the winter months we had approx. 6% more air - meaning if we have lam 1.1 this will be around 1.03 in the summer months with 25deg ambient.
EFR bot says a 63mm cw has a max safe limit of 170k which is 560 m/s
This 159k shaft speed in the summer will be become 170k hence why its being modelled at 170k currently in the winter period.
There is some headroom for like air filter clogging or minor boost leaks - but its not a lot considering tests were done with low ambient temps
Boost control is not very easy on these when requesting more than stock boost. There are many boost models that need to be considered such as compressor speed, compressor map, modelled exhaust back pressure etc
It turns out Audi actually done a bit of a short cut and based a lot of maps around the 286hp models.
Results - 380hp / 810nm
Conclusion is the turbo is way too small for anything more - it needs a hybrid turbo next.
If any one is interested in tuning work give me a shout - BobbySinghRacing@outlook.com
View: https://drive.google.com/file/d/1C3ojBzacOnk40FOe5ij7fiWx8Mz-0IlB/view?usp=sharing
View: https://drive.google.com/file/d/1fY6prJX3m2YqXsqz-L5FjR1qoVh_3n3J/view?usp=sharing
Test period - January with air temp around 6deg
Modelled shaft speed 170k
Lambda 1.08 from 3.2k to 4.4k rpm
2.4bar boost 2.1k to 3.7k rpm
Peak shaft speed (actual measured) - 159k
2500bar rail pressure
As this was tested in the winter months we had approx. 6% more air - meaning if we have lam 1.1 this will be around 1.03 in the summer months with 25deg ambient.
EFR bot says a 63mm cw has a max safe limit of 170k which is 560 m/s
This 159k shaft speed in the summer will be become 170k hence why its being modelled at 170k currently in the winter period.
There is some headroom for like air filter clogging or minor boost leaks - but its not a lot considering tests were done with low ambient temps
Boost control is not very easy on these when requesting more than stock boost. There are many boost models that need to be considered such as compressor speed, compressor map, modelled exhaust back pressure etc
It turns out Audi actually done a bit of a short cut and based a lot of maps around the 286hp models.
Results - 380hp / 810nm
Conclusion is the turbo is way too small for anything more - it needs a hybrid turbo next.
If any one is interested in tuning work give me a shout - BobbySinghRacing@outlook.com
View: https://drive.google.com/file/d/1C3ojBzacOnk40FOe5ij7fiWx8Mz-0IlB/view?usp=sharing
View: https://drive.google.com/file/d/1fY6prJX3m2YqXsqz-L5FjR1qoVh_3n3J/view?usp=sharing
