Granturismo MC Trofeo - Road Registered

StuartW

StuartW

Member
Messages
9,311
360trev said:
@Nighthawk


The Trofeo firmware is specific to the car but you wouldn't really want to use it anyway on anything but smooth flat circuit racing applications (detailed description on why below). Furthermore the firmware is not compatible with any other model as there are significant detailed changes made to the setup of the Trofeo including hardware differences like fuel pumps, etc. All this is managed by the firmware. Also be aware that stock Trofeo firmware runs "Alpha-N" strategy of operation, not "Closed Loop" you'd find on on a GTS.

...That is it doesn't use Primary O2 sensors or Air Flow Meters to adapt air/fuel ratio's as you would get in majority of road cars so as a result it rich "everywhere", if you ran it too much like this in non race conditions I would expect it wouldn't be good for the engine, you'd eventually maybe even get bore wash (waaay too much unburned fuel sloshing around in the engine) and so forth (not a problem on a race car which has frequent rebuilds). Alpha-N is often called fallback mode or “Throttle Position Sensor based static maps” because most road cars do this if their MAF fails. In this 'fallback mode' only the engine load (from your throttle pedal sensor) and RPM are used for determination of static fuel AFR lookup. This calibration needs to be done for the exact state of tune when the engine was built so any later modifications will need alter fueling/timing requirements [which are now in a static non adapting map so it would require a remap for every little change]. Fuel and timing requirements for the engine are expressed as a simple function of RPM (x-axis and load (or TPS) on the y-axis.

Its one of the reasons why so much time and energy was spent to convert this car back a more appropriate road going MAF (Mass Air Flow) and O2 setup so that it could indeed be used reliably on the road. The decision to go this route by Trofeo engineers I am sure was because in a race car your WOT (on a flat smooth circuit) and you want both consistency and reliability, no concern about failing MAF's etc.. Be aware however that Race car mapping, particularly Alpha-N isn't good for the road application. Alpha-N for example isn't ideal when driving up steep inclines or declines (i.e hills) as its not adapting for anything whereas with In closed loop mode, the engine listens to the lambda sensor to adjust fuel/air mixture. In open loop mode, in most Alpha-N implementations none of that adaption is happening (*technically some adaptions such as using an altitude meter and correcting for air temperature etc. could be done but again this isn't a consideration on a race car!). Anyway, final point is if you consider engine load increasing/decreasing but at a constant throttle position, temperature variations (impacting air density), altitude variations and just about anything else that you’d normally adapt for to make fueling more accurate and adpt for the conditions under which your driving. None of this matters in a racer where your basically at high rpm and wide open throttle for most of the racing.

sorry for all the technical detail. Hope this helps to clarify your understanding..
Click to expand...


Thanks for the explanation Trev, there is so much to this and I am very pleased that you were able to devote your time to getting to the bottom of how this map worked - fascinating explanation, cheers
 
Nighthawk

Nighthawk

Junior Member
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84
Thanks for the explanation Trev, much appreciated. Nowhere near as simple as I thought but great info


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rs48635

rs48635

Member
Messages
3,181
best thing I have seen and read for quite a while.
when and where can we see you and the car? Forum meets, car shows or track days.
 
StuartW

StuartW

Member
Messages
9,311
rs48635 said:
best thing I have seen and read for quite a while.
when and where can we see you and the car? Forum meets, car shows or track days.
Click to expand...

Cheers. And yes, all of those - the car will be out and about for sure. I'm just building up for longer journeys and then it will time for for some track tuition - the Stradale is like driving a Nissan Micra compared to this
 
StuartW

StuartW

Member
Messages
9,311
The Trofeo is in place for the weekend at Supercar Fest.

Static only this time unfortunately as it has a bad exhaust blow which is filling up the cabin with fumes so I will be getting onto that shortly, together with a slightly different exhaust configuration once I find a decent fabricator

I will be at the show on Sunday so maybe see some of you there

scf.jpg
 
Bebs

Bebs

Member
Messages
3,334
StuartW said:
The Trofeo is in place for the weekend at Supercar Fest.

Static only this time unfortunately as it has a bad exhaust blow which is filling up the cabin with fumes so I will be getting onto that shortly, together with a slightly different exhaust configuration once I find a decent fabricator

I will be at the show on Sunday so maybe see some of you there

View attachment 114571
Click to expand...
Looks absolutely fantastic Stuart - have a great Sunday.
 
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