Motronic same in GS as RT?

[sockpuppet]

My replacement Motronic turned up today after a trip round Europe in the postal service.

Its from a 1150RT twin spark. I assume this is ok to use in the 1150gs twin spark Max BMW gives out the same part # for both bikes. Not worried the bike wouldn't run just want to make sure the mapping is in there for shite quality fuel so when I use the code plug is does something!

So should be ok, just though best to ask.

Richard

 

[motobiker]

So long as the part numbers are the same.. thats all you need to know. If there was a difference between the two Motronics.. ie programming. then there would be an advisory on the parts fiche.

 

[argos]

RT runs a higher compression ratio so I would imagine the chips mapping will be different I would check this out further myself.Think it runs bigger valves so probably more advance earlier on.I would ask Steptoe

 

[motobiker]

these parts are ordered by part number.. for both bikes the number is identical. there is absolutley nothing to differentiate between one and the other... the only 'advisory' on the parts fiche is to ensure you order the correct type - single or twin spark. thus:

Observe the following for official-use
vehicles! Before ordering parts, please
check whether the vehicle has a single
or dual-ignition engine.

01 Control unit, Motronic, Double-Ignition MA 2.4 1 12/2002 13617658618 (taken from GS parts fiche)

01 Control unit, Motronic, Double-Ignition MA 2.4 1 12/2002 13617658618 (and from the RT parts fiche)

 

[argos]

Take Motorbikers point about the part number,but the part number is for a 2.4 unit which is used by both bikes,suggesting that the injector and ignition mapping must be different RT puts out more horse higher up,I may be wrong?Maybe its just the sum of a higher compression ratio ,valves and a different cam?

 

[motobiker]

would appear that the motronic is a one size fits all. (its the same one in the 'RS') and so simply reacts to the signals it receives. and isn't 'hard wired' for a particular bike... though is possibly fine tuned by the various CCPs. (maybe?)

In previous posts steptoe has always said that the gadget isn't as clever as we would suppose. (or like to think)

 

[argos]

Well I have just learnt something,genuinely suprised by that.Agree that its pretty basic,no airflow sensor etc.

 

[Steptoe]

It'll work - the difference in the power band is the air intake tubes high tech

 

[Deleted account 111026]

Think you'll find they have different camshafts as well.

 

[argos]

we had already mentioned the cams,what I didnt think about was the intake tubes

 

[Steptoe]

we had already mentioned the cams,what I didnt think about was the intake tubes

Yes, thats why it didn't need repeating as in the post before yours. but then you don't have a hidden agenda

 

[Pekkavee]

Thanks guys. Steptoe&Co
Good information.

I love this forum ( and you ).

Pekka

 

[ahutcheon]

It'll work - the difference in the power band is the air intake tubes high tech

Does the Motronic meter airflow somehow? Airflow at given revs/throttle opening must be different between GS and RT, so a fixed map wouldn't give the right mixture for both cases and a lambda is too slow for transient fueling? Just curious...

 

[Steptoe]

Different length tubes alter the torque and power band ( marginally) in the rev range. Nothing to do with the motronic.

 

[ahutcheon]

Different length tubes alter the torque and power band ( marginally) in the rev range. Nothing to do with the motronic.

Yep, but if the power and torque bands are different then the airflow through the engine is surely different? Which would work fine with carbs, or injection with an airflow sensor, but it seems the motronic doesn't have enough sensors? Maybe the open-loop air-fuel ratio isn't that critical?