Big big thanks to Rick at Unicorn Motor developments
Unicorn Motor Developments, Custom Remapping and ECU Services Stockport .
I wanted to get the car mapped and the DPF removed but didn't want a generic phase 1 map . Rick maps the car to what you want with a custom map written by himself.
The DPF was removed and replaced and you can't see any sign that it's been gutted.
The brief was get as much reliable power out of the car as possible without turning the car into a mobile fog bank.Remove the limiter and disable the EGR system.
I had seen this video on you tube
A5 3.0 TDI MRC Tuning Remap Dyno - YouTube
Car has the same engine as mine so 310 bhp and 640Nm were my idea of what I wanted. But I didn't want to pay MRC prices.
The standard car uses 62mg of fuel to make 236bhp, 236/ 62 = 3.8 bhp per mg at 4k rpm. so a rough calculation means we needed to get the injected quantity to around 82mg to make 310bhp, as well as making sure the car didn't smoke too much and the injection timing was within the reasonable limits.
After lots of logging runs and several different maps the car was done.Fortunately my car can be mapped through the OBD port later EDC17's have to come out.
There are many limiters built into the ECU that Rick had to work through and calibrating the fuel and boost to get the minimal amount of smoke the car makes took some time.
To see what impact the tuning was having on the car I found a really great program called virtual dyno
http://www.virtualdyno.net/
Just log the rpm against time.Do a run in third gear from 1500 to the red line ON A FLAT road, Tell the program the weight of the car the gear ratio the tyre size, cd of the car and it calculates the power from that. It should calculate whp.
I took my car to a public weighbridge and the car with 3/4 tank of fuel and me in it was 1880Kg. I weigh 80Kg.
The car came with a tuning box which I also tried to see what difference it made.
Looking at the video of the MRC A5 they are calculating whp losses at 62PS and the corrected figure they come up with is 311PS.
That is a 20% loss, so working on that and my car being 240bhp a 20% loss would be 192bhp.
Setting the virtual dyno correction factor so that the standard run comes out at 191bhp you get the following.
You can see the tuning box makes a difference but nowhere near in the same league as the remap. The calculated whp is 245 which is pretty much the same as what the MRC car measured at 247.
Alternatively change the dyno correction factor so that it shows the standard run at the flywheel power you end up with the graph like this, so effectively it's calculating losses the same as it ends up with the same figures
475LB/ft of torque is 645Nm
The car really flys now 0-60 from the VCDS logs I have done is around 5.6s and it gets to 100 on a closed public road in 13.5 seconds.
There is a light haze when flat out from about 3800 to 4500 and you can only really see this in the headlights of other cars.
Fuel economy wise it's definately better will need to give it a few tanks to work out the exact improvemnent
Here is a bit of a video, it was a bit damp and it was done with the winter tyres on so didn't give it loads of beans.
And heres a 30-70 in third gear 4.8 seconds.
Again thanks to rick he is a real professional who really knows what he is doing. And I would recommend anybody to him.
Got the Team dynamics wheels to fit now as had the tyres fitted so will try a log and see what the difference is as they are 5.5KG a wheel lighter than what is on the car at the moment.
Hopefully going to make the GTI spring festival at Santa pod to find out what it will do in a timed quarter mile.
Karl.