Torque..What's possible?

I got the 530 conversion done yesterday. I went with the 17 and 50. The chain is lighter, rear sprocket was lighter. Odd thing is, the x ring chain was wider than the non roller 630.

I immeditely notice the lack of chain noise. It also felt "smoother"...

Now onto performance. When I said "twitchy" that was not about handling but power delivery, if that makes any since. Before it was like it was TOO LOW geared.

Now it seems like power delivery is smoother. Never had a stock geared one so I can not compare. It seems like I now have more usable time and speed range before I have to change gears...

I will post up the Dyno chart later. my oldest son is graduated high school today!

Think I will install O2 sensor bungs in the headers next and check the tune before I alter anything.

Ken

[Nessism]

How so Ed? He seems to be going lower (2.8:1 is stock, IIRC) which will place him at a higher rpm than stock for a given gear/speed, yielding better drive at low / midrange, at the expense of top speed....going with taller gearing would perhaps need a downshift to get in the powerband, to pass with authority.

If the "Current gearing works out to 3.21" and he switches to 2.99, that's the wrong direction. Sounds like we agree though regard gearing lower than stock for increased pick me up.

[posplayr]

nuff said

http://www.thegsresources.com/_forum/showthread.php?t=154743

[Mysuzyq]

You're going the wrong way on the gearing if you want roll on power.

How so Ed? He seems to be going lower (2.8:1 is stock, IIRC) which will place him at a higher rpm than stock for a given gear/speed, yielding better drive at low / midrange, at the expense of top speed....going with taller gearing would perhaps need a downshift to get in the powerband, to pass with authority.

[blowerbike]

if you want a bike to go around corners.......
buy a bike to go around corners.
suspension parts cost money and adds weight.
install a set of 400 twin forks w/ one rotor and start trimming weight.


hahahha
i just read the original post.
just add NOS and poke the button in mid turn.

Upgrade your suspension. There is no way you can't keep up with a 700# bike.

+1
that bike is just getting into the powerband at 6-7K. Keep it there! You should be able to romp all over those guys if you learn to handle the the gears and make your bike stable in the corners. At no time prior to say 120mph should your bike even feel remotely twitchy. Fix the suspension. Get some corner experience. In most real corners I'm usually in second and running high rpms and have mad torque to power out of corners.
Also both those bikes are twins the later being a vtwin which are torqu monsters. But that is no reason to think you can't hang with those guys. A good GS1100E will chew up and spit out most harleys except for maybe the first 50-100 feet in a roll on. Just got to wind it up and let her do her thing. But if you don't have her set up propperly, you're going to end up dead. Tires and suspension, more important than a set of cams or a pistons. If you can carry the speed into and out of the corners, what good is it? (yes Ray, I know you probably disagree. Lmao)

[chef1366]

Upgrade your suspension. There is no way you can't keep up with a 700# bike.

83 GS1100E. Dyno'd at 92 rwhp and 64 ftlbs torque.

These are peak numbers. Can you post the dyno chart - torque vs rpm?

If you're looking to keep up with your friends, I'd suggest some track days rather than engine work.

Speed you take with you, long after the bike is gone.

gosh I was going to say that as well
I hate to harp on about A Twist of the Wrist II but one segment shows a 7 second per lap improvment just due to throttle control and taking the proper line. oh and overcoming primal self preservation insstincts.

If the other guys have better bikes and track experience then perhaps they would best you if you were on identical bikes.

If you're looking to keep up with your friends, I'd suggest some track days rather than engine work.

Speed you take with you, long after the bike is gone.

useful link maybe?

http://www.ajdesigner.com/phphorsepower/horsepower_equation_rotating_torque.php

in keeping with a big bore producing max torque

http://www.vincelewis.net/bigengine.html

so the last engine listed produces torque = 5149019.6078431 pound-foot
at 102 rpm

[Nessism]

You're going the wrong way on the gearing if you want roll on power.

Thanks for the reply's. Looks like I need to find a second GS for a guinea pig! My 82 had 36 carbs, 4n1 headers, and a dynojet kit with pods. I liked it but somebody else wanted it more then me! I only had it 3 weeks.

Not quite ready to open this motor up yet as it runs so good. What would carbs and pods realisticaly gain?

Here is my scenario and problem. I ride mainly with a guy that rides a BMW K1200R and a guy that rides a wicked M109R. Coming out of a curve they can pull me till I get back into the revs. Once I get to 7,000rpm I can catch them easily.

If I stay in the upper revs 6-9'000rpms, then the bike is "twitchy"?? It scratches the back tire coming into the curves at times. when I can roll on from 5 grand, then I have more to play with. Problem is that it really comes alive about the time I get to the next curve and then I have to let off. just looking to make it a little flatter.


I currently have 14 tooth front and 45 rear sprockets, so it is lower geared. I just bought the stuff to do the 530 xring chain conversion and got a 50 tooth rear and 16,17, and 18 tooth sprocket to play with gearing.

Would the lower gearing amplify the peakiness of the powerband? Current gearing works out to 3.21.

The 17 front,50 rear will work out to 2.99.

Slipper clutch? That would solve some of the downshift tire scratch problems...

The guy on the M109 just chaps my hide! HUGE bike, INCREDIBLE rider(raced pro class sport bikes at Road Atlanta and Daytona). I simply do not have the balls he does but would be nice to not let him pull me out of the curves when I do catch him....

Ken

[chef1366]

Not sure if this will help business Ray but here you go



After this you can look forward to building a new motor.

http://s2.photobucket.com/albums/y32/chef1366/1229/

[rapidray]

If you want torque, NOTHING will make torque like bigger pistons! I like a GS engine in the range of 1400cc or so. Makes for LOTS of fun! It requires some work to do that though so I would recommend a set of cams in the range of 240-245 degrees of duration @ .050 lift, & a 4 into 2 into 1 exhaust system to begin with. Compression makes torque but you will be limited by the quality of gas you can get. Advancing the timing also adds torque but ask Bill for pictures of what too MUCH advance will do. It ain't pretty!!! Call me at 714-356-7845 if you would like to discuss more in detail & maybe design your engine to do what you are looking for. Ray.