Tuning EPROM for R1100GS Qs

[Tsiklonaut]

Got the new EPROM. But unfortunatley it came with german manual for installing. I translated it directly, all seems dead easy to install it exept one thing i didn't understand quite well:

Do I really have to saw off half of the air-intake pipe that goes into airbox (that black plastic pipeline under the tank), so the engine gets more air right?

Can i replace my stock BMW EPROM back too if the air intake pipe is halfly sawed off?

Damn, one thing makes me scary too: there's written that is a "racing-part" in the manual - could it affect long term reliability of the bike?!?!? Altough it only gives few additional horses and newton-metres if i assume correclty in terms i have KAT and original exhaust.

Well, you know, the dudes who made that chip made them mainly for racing Ducatis, MV Agustas and Bimotas, very emotional Italian motorcycles you know...

Cheers, Margus

 

[Telford]

I read those instructions as well.

The idea behind shortenning one of the inlet pipes is to produce assymetrical airflow / pressure in the airbox, which is 'supposed' to improve pickup / torque.

My 1100 came with the BB chip fitted and I keep meaning to check and see if the mod has been done - but I just can't be ar5ed!

An 1150RT owner, of my aquaintence, replaced his inlet tubes with those from a GS and he's convinced that it's improved the low/mid range grunt, if it's a real improvement it could (probably) be down to increased air speed through the smaller tubes.

Oops, tangent alert!

If you're using the correct chip map for your exhaust setup you'll be fine - your just getting a bit more fuel when you need it.

 

[Tsiklonaut]

I read those instructions as well.

The idea behind shortenning one of the inlet pipes is to produce assymetrical airflow / pressure in the airbox, which is 'supposed' to improve pickup / torque.

My 1100 came with the BB chip fitted and I keep meaning to check and see if the mod has been done - but I just can't be ar5ed!

I haven't figured out how to remove the pipes yet to saw half from it off? I can only push the into airbox as far as i'm concerned but not in the other way?

So it means i have to remove the complete airbox to get the pipe out and that includes removing rear shockabsorber and removing rear frame connections?

But if in case i don't saw off the piece from the inlet pipe, then the engine doesn't work correclty with the tuning-chip or just don't give much additional torque?

Margus

 

[Le singe]

I wouldn't pay too much attention to the 'asymetrical air flow' information,leave the inlet pipes as they are and cut out the right-hand side of the airbox behind the removable plastic cover.
I made a hole about 50cm2,it cannot be seen from the outside and has removed all restrictions.
The airflow is stabilised by the the airfilter and the airfilter to injector tubes.
We're not talking about a high-performance engine here!

 

[(RIP) Kaister]

undo both the tube clips - push the tube into the box - twist it thru 180 then pull it out - wd40 helps.

the inner tube is a push fit into the outer tube - held in by a moulding detail. Use a drill to remove one of these - then pull the tubes apart.

The theory of inlet tube length is to do with pressure pulses and wave reflection.
Air is accelerated and reversed - with pulse waves moving up and down the air column as the inlet valve opens and closes - faster than you can think about.
The inlet tube length is a tuned pipe - the shorter it is , then the faster the air can flow as the harmonics tune to the engine.

Race cars have had differing length or dynamically variable inlet tubes for years to try and spread power across a broader rev range.

quite simply - a shorter tube produces power at a higher rev band .

i use shortened tubes, drilled inside face inlet snorkel and a straight thru pipe - hardly any difference overall, apart from a deeper exhaust note.

 

[Le singe]

Like you say,Motomartin, the mods between the airbox and engine make no real difference at all,just let the airbox breathe a little easier and that's it with the standard engine components.