DOHC GS to HP2S Horsepower

Guest24 · 10-12-2011, 06:55 AM

I'm considering a GS DOHC. I know it is rated @ 110 hp at the crank. What would I have to do in order to get it to the 130+ hp level of the HP2Sport?

Deans BMW · 10-12-2011, 07:10 AM

Bubba, my best advise is to wait for the Wasser Boxer GS to be shown at either EICMA or Intermot next as a 2013 model to be available prolly at the beginning of 2nd quarter next year.

BTW, I have a 2010 DOHC GS and it is a very strong runner even at the 7,000 plus elevation that I mostly ride at.

sfarson · 10-12-2011, 07:11 AM

The easiest, if not only option, would be to wait a year for the water cooled boxer GS.

Guest24 · 10-12-2011, 07:21 AM

Dean and Steve, I understand what you are saying; but, I've never really liked water cooled engines. My F650GS and Ducati ST3 were my attempt to like them; but, I just want the old air cooled bike. I really enjoyed the HP2Sport engine and the hp it developed. I guess the first question is, is it doable with rods, pistons and cams? Then open up the breathing and exhaust follower by Power Commander.

sfarson · 10-12-2011, 07:50 AM

Bubba... I hear you on that. The '07 12GSADV is something I am holding on to. It is very special and I am going to miss having this aircooled engine powering new bikes. There is some optimism however, that Munich is cognizant of this and will somehow preserve the aircooled charm with the watercooled flavor.

I suppose with $$$ and effort the DOHC GS can approach the performance of the DOHC HP2 Sport, but I wonder what it will do to the balance and rideability of the GS. I was on the 12GSADV (non DOHC) yesterday and it just isn't a fun bike to head north of 110 - 120mph on. When tucked and leaning forward on the HP2, powering forward at speed - yes, when sitting upright, up on a high bike, not so much. Long term reliablility, on those cross the time zone trips the GS is famed for, would come into mind as well with a seriously modified engine.

It is very possible you would rarely ever need/use the DOHC capabilities of a 2010 GS. I don't even do it with an '07 non DOHC. But this is me.

SergioK · 10-12-2011, 07:58 AM

Ive got Lennies sprockets and a Techlusion on my GS and ya know, the power delivery is actually VERY nice, as much so that there is no 'want for more'. The torque curves come on at different ranges but that's how it should be.

MaineRoads · 10-12-2011, 08:48 AM

Why not get the HP2 Sport for those high speed runs and leave the Gs alone.

AZ-Twin · 10-12-2011, 09:09 AM

What does the torque curve on an HP2 Sport look like in the 3-6K RPM range compared to a new GS, anyone have some dyno graphs?

Max HP numbers are useless without charts to see what the torque curve looks like, that is if your plan is to ride the bike. For sitting around bragging max HP numbers are quite useful I guess.

shreddr · shreddr's Garage

Quote:

Originally Posted by Nail24

I'm considering a GS DOHC. I know it is rated @ 110 hp at the crank. What would I have to do in order to get it to the 130+ hp level of the HP2Sport?

The valves and throttle bodies on the hp2s are a lot bigger

josephvman · 10-12-2011, 01:34 PM

Unless you really plan on doing more than the occasional dirt or fire road, test ride a Multistrada 1200. Maybe not as good in dirt as a GS, but it is a monster on the pavement.

Corky · 10-13-2011, 05:31 AM

You think the Hp2 has more power than the multistrada 1200?

jduke · 10-13-2011, 05:39 AM

I've read the Multistrada 1200 S version has 150 hp.

Nitro · Nitro's Garage

Do you guys really know what horsepower means when it comes to transfer force to the ground via a tire? It means really nothing unless you keep your engine 90-100% RPM all the time.

Horsepower is a virtual number function of torque and time: How much torque an engine produces given some time, usually RPM in our case.

One day you might grow up, wise up, and realise that all it matters is torque and number of explosions per revolution, hence thumpers and twins for most dirt and street riding: think about going off-roading with a screaming IL4 engine...good luck with that!

Ask yourselves if you would you prefer a bike with 150 hp @ 16000 RPM with 50 lbs ft of torque or one with 150hp @ 10000 RPM but with 80 lbs of torque with 80% availability just off idle.

Also, what manufacturer X says about hp number (and weight too) means nothing until you put the bike fully wetted on a scale and the rear tire on a dynometer in order to MEASURE torque.

What you measure is what you know, if you cannot measure it, then you simply don't know.

As usual ignorance got to be bliss and turbo 'busas with five-footer swingarms are cheap if hp is all you care!

Bob Hancock · 10-13-2011, 06:09 AM

Quote:

Originally Posted by Nail24

I'm considering a GS DOHC. I know it is rated @ 110 hp at the crank. What would I have to do in order to get it to the 130+ hp level of the HP2Sport?

I don't understand why you'd want to do that.

Guest24 · 10-13-2011, 06:12 AM

I want it to pull like a 4020 John Deere and scream like a Bonneville Salt Flats Racer, Nitro.

GotRoad? · 10-13-2011, 07:03 AM

I thought you had a 650 that you could barely ride. Why would you want a bike that requires even more skill to manage ?

Guest24 · 07:37 AM

Come give me $6,000 and I'll let you show me how the F650GS should be ridden. I'm sure you can demo your "devil may care" riding prowess.

Quote:

This message is hidden because GotRoad? is on your ignore list.

GotRoad? · 10-13-2011, 08:15 AM

Quote:

Originally Posted by Nail24

This message is hidden because GotRoad? is on your ignore list.

Really? LMAO

signit98 · 10-13-2011, 08:31 AM

Quote:

Originally Posted by GotRoad?

Really? LMAO

Yeah, he has a hard time facing the truth... just like this thread proves that he has a hard time grasping reality...

jaytee · 08:54 AM

I'm completely flummoxed by this post. I was under the impression that on loose surfaces you wanted long power pulses - hence the value of large displacement singles in dualsport/offroad bikes and why a low RPM boxer with lots of lower end torque worked well.

But higher strung motors like the R12S are inconsistent at low RPMs and sacrifice power in favor of flow at higher RPMs...

What aspect of the GS are you wanting, Bubba? The dual sport capability? In that case a current OHC R12GS has lots of power and is specifically designed for that.

If you are unhappy with the compromises in power and weight but still want a GS then look at the HP2 megamoto.

If what you really want is R12S performance in a more comfy road ergo package, then I agree with what has been said that you need to look outside the BMW line.

JT

PS: ...and the quoting and responding to someone you are ignoring thing - uh, not to be rude, but it makes you look childish and immature. Trust me, the people reading this forum can tell if someone is being an ass all on our own. FWIW, IMHO.