Re-dynoed the Rockster last night with HP & Torque print

fnfalman · Post by **fnfalman** » Fri Sep 02, 2005 9:27 am

The last time I dynoed the Rockster, these guys didn't have a printer with them (reference this old thread http://r1150r.org/board/viewtopic.php?t=2510 ), but they came again last night and I got the Rockster redone. This time they have a printer and I got the HP & Torque printout.

If anybody knows how to post pic, I'd be more than glad to email a photo of the printout for posting. I don't have a photo hosting website and all that jazz.

But the performances were pretty much the same: 90-HP & 70-lbft (rounded down and up a few hundredth). Just the Remus Y-pipe and Revolution can with baffle removed. The power curve wasn't all that great with a lot of petering off at high RPM and the torque curve isn't flat at all. Definitely needs a Power Commander for tuning the fuel map. Probably high compression pistons and hot cams would help too.

I know that it will never be the equal of a crotch rocket, but just for the hell of it, I want to see how much more performance I get out of the Rockster without bolting on a turbocharger or nitrous oxide.

Taipan · Post by **Taipan** » Tue Sep 06, 2005 7:51 am

You can host the picture at http://www.imageshack.us or if you're not familiar with uploading pictures etc email it to me and I'll do it for you r30ccm @ yahoo.co.uk (remove spaces)

I'd like to see the graph and I'll post mine when I get it done too.

Dave.

fnfalman · Post by **fnfalman** » Wed Sep 07, 2005 8:24 am

Let's try to see if this works

Post by **boxermania** » Wed Sep 28, 2005 9:53 pm

This one is a stock R1150R, 77 HP, done by SJBMW

This one are two superimposed runs on my bike.

The first one, Red trace, is with the TBR cat eliminator and the C2 can, along with a 3 degree timing advance. Just about 80 HP. Notice the squigglies at the top of thge HP trace and the A/F ration, in the 14's, not conducive to power generation.

The second one, Blue trace, is the set-up above with the addition of a Techlusion R259 with the factory setings. Just under 84 HP. Notice the bump on the top end power and the lowering of the A/F ratio into the 13's.

The bike runs single electrode Autolites, 89 Octane gas and get 40 to 42 mpg all the time.

Horsepower cost - TBR Mods $420/3 HP = $140/HP
Horsepower cost - Techlusion $250/4 HP = $62.50/HP

I have since then made some additional mods:

Removed the airbox and installed UMI pods
Replaced 3 Bar pressure regulator (Standard) with 3.5 Bar from K bike
I'm in the process of testing some exhaust cans, working with the inside baffling and volume
Have also some additional mods for the intake that I want to try

Once finished with the seat of the pants off to the dyno for the last run.

Right now the bike is running strong, the roll on is very crisp and I'm getting 45 to 46 mpg, honest. The plugs are running just perfect, I might have gotten close to the best A/F compromise......I'm guessing on that one.

fnfalman · Post by **fnfalman** » Thu Sep 29, 2005 2:01 pm

I just got a call from my local performance tuning shop that the PC III is in, so I'm getting it installed on 8 OCT and have it dynoed again. Then I'm going to fiddle with it some more.

I'm not going to make this Rockster into a crotch rocket fighter or anything like that, but it's a bike that I love and I want to tinker with it and see how much more oomph I can squeeze out; within reasons, of course.

Post by **boxermania** » Sat Oct 01, 2005 12:41 am

fnfalman.....have the dyno guys check the charts and the description sbelow.....your red description, the one aluding to the 90 HP is not supported by any of the HP curves on the chart.

The other giveaway is the torque value.....they are all about the same....remember that the dyno measures torque and generates a HP curve.

Post by **boxermania** » Sat Oct 01, 2005 12:42 am

boxermania wrote:fnfalman.....have the dyno guys check the charts you posted and the descriptions below.....your red description, the one aluding to the 90 HP is not supported by any of the HP curves on the chart.

The other giveaway is the torque value.....they are all about the same....remember that the dyno measures torque and generates a HP curve.

Post by **boxermania** » Sat Oct 01, 2005 12:43 am

fnfalman.....have the dyno guys check the charts you posted and the descriptions below.....the red description, the one aluding to the 90 HP, is not supported by any of the HP curves on the chart.

The other giveaway is the torque value.....they are all about the same....remember that the dyno measures torque and generates a HP curve.

Post by **CycleRob** » Mon Nov 06, 2006 12:01 am

There are like 3 different types of Dyno machines. Inertia, like the DynoJet Dyno and Hydraulic resistance or magnetic resistance types like the others. The DynoJet is pretty much the industry standard because it is relatively cheap at $10K, holds it's calibration for years and has almost zero maintenance. It's a solid steel 900lb (408.2Kg) drum that is directly rotated by the bike's rear wheel. The computer counts each full rotation of the drum and from the work performed (power) to accelerate from low RPM's to the bike's redline RPM in 4th gear, it figures out the HP (rate of doing work to accelerate the 900lb steel mass) and computes the torque (the turning force). If you heard a bike on a DynoJet, you know it sounds just like it's taking off down the road -BUT- it's staying in one place. The steel drum closely mimicks the inertia of normal acceleration but with zero wind resistance.

In the 9 years and well over 1,000 bikes I ran on our shop's DynoJet Dyno, it debunked more high performance part's claims than it verified. Not good when you want to sell the parts, also believing the Mfgr's sometimes wildly optimistic claims. Most of our salesmanship was forbidding customers from wasting money on popular high performance parts that average $200---$800 per HP -and- spending the money instead on just a slip-on muffler, suspension upgrades and a proper set-up that besides being safer to ride, is a faster, more confident ride. For about the same money, a much better bike. It's especially true of our 1150R. When any dealer wants to sell you specific performance parts, ask to see a customer's before/after dyno charts and turn-key price for the package before you commit with a credit card. Those DynoCharts were both our best sales tool and an eye opening reality check for potential marketing hype victims. It spells out all your performance choices and more importantly tells you what NOT to do.

Even with actual HP gains, there is no free lunch. There's always some trade-off for max power increases and you need to know what they are beforehand. A LOUD exhaust and violently pulsating intake honk can wear down the joy of those small HP gains. I've Dyno'd bikes with their airboxes removed and while wearing earplugs and earmuffs protected my ears, the large amplitude intake pulsations felt in my chest seemed powerful enough to shake things inside me loose! It was not a pleasant sensation.

My best arguement is to remind 1150R riders WHY they bought this bike in the 1st place. It wasn't for the big HP it makes or the scarey acceleration. Spend the money on a good (*Garmin) GPS. It'll work in the wife's car too and you'll thank me later.

You're welcome.

* P.S. - - - I own a Magellan RoadMate 300

Post by **boxermania** » Mon Nov 06, 2006 7:22 am

Now, that is a statement of a gentleman and a scholar.....I couldn't have said it better myself......thanks cyclerob for that well drafted ensemble.

I don't own a GPS but I like them a lot.....does that count?

fnfalman · Post by **fnfalman** » Tue Nov 07, 2006 2:01 pm

Well, duh, I didn't buy a BMW boxer for the power. But that doesn't mean I don't want to squeeze out every bit that I could out of the Rockster. Just the ability to rev cleanly through the range AND the slightly louder exhaust AND the honking intake were enough to justify the cost. I don't want a bike so quiet that I might as well stay at home and play with a sewing machines.