I see that xHP (the gearbox tuning app) and MHD (the engine cu tuning app) have had various revisions..so decided to reflash both.
I had set the MHD throttle to linear rather than the default where it gives a lot of throttle for not much pedal (try 650nm in the wet) and also speed of throttle reponse to "M1"..
I found the M1 setting a bit too touchy especially in sports mode and when doing less than about 70 mph..so I adjusted it to a mid point about halfway between 'M1' and 'normal'
At the same time I changed the default gearbox for MHD to 'manual' which is what xHP generically recommend for tuned engines.
Turns out that MHD andxHP have worked together and you can use either the 'DCT' or 'manual' options.
Chatting on another thread it was asked about BHP and how strong the gearbox was..I've copied this across for completeness..
So the DCT is Getrag's GS7D36SG..there were 4 versions..the E89 had the first version.
BHP is not the issue with gearboxes its torque.
35i has 450 nm as stock and 35is has 500nm through overboost.
The clutches are controlled by pressure at up to 17 BAR which is alledged to related to 600 nm torque.
Other boxes have an 18 BAR limit which relates to 700nm torque.
My 35is on a MHD stage 1 tune V9 made 562nm, on a stage 2+ V9 made 591nm and on stage 2+ V10 made 648nm
So for this and other good reasons xHP is your friend..with a 19 BAR limt it can do 800nm+ and now, released 20 BAR for 1000nm..(stage 3)
That is if you tune it..
What's very important at this end of town is that the tune and the gearbox talk in full to each other..so piggy back tuners and back street maps are a really bad idea as the geasrbox may not realise how much torque is being produced and as a result does not applye nough clamping pressure..once DCT clutches slip they burn out very fast.
Auto boxes like the ZF 8HP have torque limiters which saves the box from its own demise..the DCT hasn't got them.
xHP allows you to place torque limits but without a dyno you don't know whether you are skirting close to the edge..
My new turbos are predicted to make around 735 nm so a 19 BAR limit should work nicely.
I spent the day tweaking xHP and MHD and I've got it to a very nice place in terms of smoothness, response and performance.
So the powertrain feels pretty good at this stage.
More fettling required on the chassis, hopefully sorted out over the next 2 or 3 weeks between runs..
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