K1100LT Tuning

[jacksdad1963]

Has anyone managed to wring a bit more power/torque out of the 1100?
With the full fairing, tragkorbs, topbox/speakers/backrest, etc.etc. its a bit down on power, so, has anyone had success in upping the output?  :2thumbup:
Its not slow, but its struggling to keep up with my mates Hayabusas, Bkings, ZZR14........
I want midrange improvement, so it can hold 80 mph a little easier  :eek:

Any ideas please?

[johnny]

greetings...

gotts to keep it near the red line...  nothing else needed...

j o

[wmax351]

Turbo.  :2thumbup:  Gives tons of power. The engine will put up with 12-18 psi of boost before the rings bust their lands. Modify the valve gear a bit, and the limiting factor is a redline of about 11,000 rpm above which you risk the alternator detonating right under your nards. Corresponds to over 300 HP. The driveline may or may not put up with it for long.

http://www.rbracing-rsr.com/bmwturbos.htm



Or you could do what j o talks about. My naked, windshield wearing K75 (which is potentially less aerodynamic than a faired bike) will easily hold 90mph fully (over) loaded or with a passenger, with plenty of room to go. It's not a busa, but it gets the job done. There is some limited tweaking that can be done with the motronic ECU, to advance timing, tweak mixtures, and remove rev limits. 

[tg4360]

Something must be wrong... When my K100LT had it's full fairing, bags and all my gear, I had no problem holding 80+ even with wind.

It could be a little scary at times but there was plenty of power.

I've ridden my friends 1100RS and I'd love to have that motor in my bike but as for cruising at 80, there was no difference.

TG

[wmax351]

I mean, hell, my R75/5 will cruise at 80 pretty comfortably.

[552255]

You have indentified the 'problem' with the LT...weight.  I have removed the useless (can't hear them) speakers, and stereo, wiring.  With todays' digital modern headphone type devices, a tape deck is a heavy relic.  A newer battery can also weigh less, an aftermarket exhaust system weighs less than stock, and some have even removed ABS brake system--usually because its not working--to shed many pounds. 

Unfortunately, these are costly, or pretty serious bike modification/altering.  Best to just accept it as is...its been said the mid-range torque is a strong point for the K1100.  Although at 80 mph, i'm running...near 5000? ish, RPM.  Wound up pretty good...where's that sixth gear??   

[jacksdad1963]

My K1100 will easily cruise at 80, but takes a while to get there, and it loses speed on hills meaning a downshift, then its revving its nuts off trying to catch up with the others: its just sluggish more than slow, a bit of extra midrange would be perfect  :2thumbup:
I removed the rear speakers, backrests, vanity light and mirror from the topbox, removed the front speakers, that was a lot of weight right away!The topbox itself still weighs a ton though, but its handy being able to just unclip it when not needed, same as the tragkorbs.
The fairing and electric screen must still weigh a lot though!

[MEL]

There is a problem unless you have been riding a Busa.My 1100LT will do 85 easily with 2 up. Smooth as silk at 80 and above...Never a loss of speed or power as long as rpms stay up which is standard for any moto cycle not a HD V twin...forget the weight issue unless racing ....wont matter

Mike

[mystic red]

Are you kidding? Two up...80 mph and whack the throttle and you are at 110. Will it keep up with a Busa? No, but it will be respectable. You're missing like 70 HP.

[wmax351]

My K1100 will easily cruise at 80, but takes a while to get there, and it loses speed on hills meaning a downshift, then its revving its nuts off trying to catch up with the others: its just sluggish more than slow, a bit of extra midrange would be perfect  :2thumbup:
I removed the rear speakers, backrests, vanity light and mirror from the topbox, removed the front speakers, that was a lot of weight right away!The topbox itself still weighs a ton though, but its handy being able to just unclip it when not needed, same as the tragkorbs.
The fairing and electric screen must still weigh a lot though!

You sure you're opening the throttle fully? 80 mph is right in the peak torque on these bikes. There's a lot of power on tap there.

[jacksdad1963]

Well, thanks for all the comments about your bikes, and how they run and how good they are at everything. My bike is running perfectly well....its just not very quick when I need it to be....hence the question! An increase in midrange power would make this bike perfect, otherwise I will just keep downshifting to keep up with the big jap bikes!

[wmax351]

http://www.ebay.com/itm/BMW-K1100RS-K1100-K1-K100RS-BBR-Chip-Performanc-e-/140983561474


You pays yer moneys and takes yer chances. On an 1100, you will get some benefit from extra ignition timing. Probably not the 20HP they claim, but i'd say you would get some. If you get one of these, don't mechanically advance the timing on the hall plate, as is done on the 2 valve bikes. More power could be gotten from breaking the Rev limiter with a chip mod (you'd need a EEPROM programmer to adjust this), at the possible expense of the engine. The 4V bikes breathe a little better, whereas the 2 Valve engines become choked and have power drop off past 500rpm short of redline.

[jacksdad1963]

That chip won't fit my bike, mines a 95 with ABS2  :2thumbup:

[johnny]

if you are looking for 20 more donkey power you can mix a pint of nitro methane to 4.5 gallons of no corn ethyl...

j o

[jacksdad1963]

Thanks for that Johnny: I did as you said and blew my nuts off in the ensuing explosion....I now claim your first born son as my own!
Back to reality....I just rev my bike much harder than I felt normal, and alls well  :2thumbup:
I didn't think a 1100 4 valve motor would need the revs, but these bricks seem to like big rpm's, now I'm holding on each gear for longer, I'm doing okay!   :clap:

Never expected a big BMW would need such high rpm's to keep moving....not complaining though!

[bocutter Ed]

but these bricks seem to like big rpm's

Somewhere on this site there's a graph of the torque curve ...

[Motorhobo]

Never expected a big BMW would need such high rpm's to keep moving....not complaining though!

I think it's a K-bike thing...I recently rode an R1200 Cruiser and it didn't seem to need any Rpms at all. I don't think it even had a tachometer...

[jacksdad1963]

I must admit, the more I ride it, the bettef it gets!
I'm getting used to revving it right to the red, and its moving a hell of a lot more, basically I need
to ride it like it was stolen!
Now I've hit a new problem....the clutch is slipping: its done 93k miles tho, so come the winter I'll be stripping it, service the whole drive line and fit whatever it needs, I love it now, defo another 'keeper'

[Grim]

Till you get use to it it feels like you should be shifting it at the same points as a 4cyl car. It's a whole different beast north of 4k. It goes from elevator music to speed metal.

The LT has more of a hwy gear. The RS has different gearing that gets the RPM up a bit more. 

Clutch:
There is a good chance that the seal is leaking on either the transmission input shaft or engine oil seal and contributing to your clutch slip.  Research that. Also using too thin or much grease on the clutch splines can also lube the clutch. Bunch of posts about that.

We have a bit of trouble getting BMW recommended Staburags NBU30PTM here in the states without spending some time in the back room as the motorad rep acts out their prison scene fantasy. Guard dog is recommended by some as is honda 60. The 60 seems a little thin but I used it and it made shifting much better. Next go I will be trying guard dog. 

[jacksdad1963]

Thanks Grim  :2thumbup:

Re. the clutch, I've read up on it, thinking I'll go for Honda 60 for the splines: if I can get any! Pity we can't get just the right amount we need in a little tube or sachet....might look into that  :2thumbup:

[bizzaro]

MY 94 K1100LT turns into an animal at 56k rpm.  It makes my asshole tighten up, an the road gets 100% of my attention! :yes

[Brad-Man]

MY 94 K1100LT turns into an animal at 56k rpm.  It makes my asshole tighten up, an the road gets 100% of my attention! :yes

56k?

What have you done to the bottom and top end to prevent grenadine and to even rev that high?

Like to know what injection system you are using too.

As - you're just pulling our leg - you installed a turbine engine - right?

 :hehehe

[bizzaro]

ok, my bad, 5600 rpm. not 56000 rpm! :nono

[drut]

Don't know what resurrected this thread but as a personal observation a K1100RT can be hard to catch:my good friend,despite weighing in at 320lb delights in embarassing sport bike riders on his 93'1100LT.