The injection system and aftermarket chip situation is interesting.
The R1100RT/RS is claimed to produce 90bhp against the R1100GS's 80bhp,(all BMW's figures).
The R1100RT/RS has slightly higher compression ratio and uses a different cam profile,but everything else,ie downpipes,injectors,cylinder head,are the same.
Interestingly,the RS uses the same Motronic unit as the GS.
Obviously some extra power is gained by the increase in compression ratio promoting a better burn,(10.3 against 10.7:1),but,as there have been no modifications to porting,valve sizes,exhaust,etc,in this case,more power equals slightly more fuel.
As most chips are purchased to stop lean running,this information would suggest the standard Motronic contains a map to enrichen the mixture adequately to cope with even the most free-flowing silencer.
A friend of a friend is really knowledgeable about injection systems having worked for Sagem and the Foggy Petronas team and I've asked him to look at the BMW system and explain exactly how everything works and within what parameters the sensors operate,for example,could the air temperature sensor in the airbox be altered to 'trick' the system into running say, 5% richer.
There is a lot of useful info on the Forum but,as yet,no 100% information.
The local BMW dealers are great at saying 'That's broken,here's a new one',but no use in explaining technically exactly what everything does,I guess there's no need for them to know.
Should be interesting and useful knowing the full SP of the system.
Apparently all the hardware is standard car parts,that's why it is all so large!
