Magneti Marelli 8p Vs Motronic 3.1

[pugrallye 0]

err 8P uses both tps and maf sensor...

[huckleberry 0]

Maybe an interesting question is; can the mp3.1 maf sensor or the Magneti 8p map sensor read positive pressure? If it can't then the ECU would base it's values only on behalf of the mapped values probably on the TPS. Anybody have an idea if I'm talking nonsense here?

[Hilgie 16 2 Cars]

afaik they both can only read vacuum...

[huckleberry 0]

Thanks Hilgert, we talked about it yesterday already. I was interested to hear other people's views about using it for a turbo conversion.

[DrSeuss 0]

From what i understand, the difference all boils down to the limp home map. When using throttle bodies the map sensor is disconnected and the ecu uses a back up map. On 8P i presume this map is better suited to running a car, the bosch system may not have many load sites on its limp home map. In other words its more suited to alpha-n mapping rather then speed density.

 

As for whether mp3.1 can be used on a turbo, yes it can, Wayne solders a new map sensor into the ecu then remaps the sites taking into account the new scaling factor.

[huckleberry 0]

As for whether mp3.1 can be used on a turbo, yes it can, Wayne solders a new map sensor into the ecu then remaps the sites taking into account the new scaling factor.

 

That is very interesting. So with a MP3.1 you could apply different injectors and a mapsensor in stead of the maf sensor and you could run it with a turbo making use of the mapsensor.

 

But it'll need a rolling road specialist who knows this stuff. That might be a problem here.

Edited January 3, 2006 by huckleberry

[Super Josh 4]

Maybe because 8p is using a TPS and MP3 is using a MAF sensor.

 

Their seem to be quite alot of inaccuracies in this thread, which may be confusing things and leading people off in the wrong direction(s)

 

Both MM 8P and MP 3.1 and 3.2( the version used for the 16V engines and including an Idle Control Valve) use a MAP sensor and throttle position sensor( aka throttle Pot. ) for load sensing and a Crank Angle Sensor for speed sensing. So not a MAF sensor in sight

 

 

From what i understand, the difference all boils down to the limp home map. When using throttle bodies the map sensor is disconnected and the ecu uses a back up map. On 8P i presume this map is better suited to running a car, the bosch system may not have many load sites on its limp home map. In other words its more suited to alpha-n mapping rather then speed density.

 

As for whether mp3.1 can be used on a turbo, yes it can, Wayne solders a new map sensor into the ecu then remaps the sites taking into account the new scaling factor.

 

So this seems more like it, just using the throttle pot. for load sensing. I suppose an Email to wayne will confirm everything, maybe he has better Development/Diagnostic tools and familiarity with the 8P system?

 

It's a shame that the 3.1/3.2 system isn't more suited to 'bodies as the map in the system off an XU10J4 lump would probably be a good enough 'base map' to get an Mi running prior to the remap.

 

 

 

Josh

[pug_ham 244 3 Cars]

I think from what I remember Wayne saying when I was getting my car mapped on MP3.1 last year that he can play with the map a lot more on 8P due to the variables than on MP3.1 & he prefer's it for this reason.

 

I assume this is also why it is better suited to throttle bodies over MP3.1.

 

Graham.

[Hilgie 16 2 Cars]

@Josh: afaik the MP31 uses a heated wire to measure airflow so that's a MAF and not a MAP sensor.

[DrSeuss 0]

@Josh: afaik the MP31 uses a heated wire to measure airflow so that's a MAF and not a MAP sensor.

 

mp3.1 uses a map sensor.

 

I don't know about 8p but i'm 99% sure its map sensor based as well. Its obviously down to the way the ecu is set up in terms of map sites and waynes ability to alter them.

 

For anyone thats interested there are 2 ways to remap standard ecu's one of them involves buying a piece of software from an italian company (costing about 15k) then you buy credits for each individual ecu. Detailing the individual locations for the various map information.

 

The other is ecu hacking which is a laborious process that involves lots of faffing around. And stuff i'm not that able to explain. Sadly wayne isn't that interested in sharing his methods.

[Hilgie 16 2 Cars]

Then which one uses the heated wire sensor? S16 engine?