• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

So I had my 650 dynoed this weekend.

  • Thread starter Thread starter AF_Bill
  • Start date Start date
A

AF_Bill

Guest
My buddies and I went to a bike show sunday and there was a vendor that had a dyno. I wanted to see exactly how much horsepower I was puttin out. Once she was on the dyno, I was impressed, as well as a few people watchin, that she didn't pop or backfire like all the harley's did. After they were done, they gave me the print out. My carbs are PERFECTLY tuned, which made me happy. But the best pull was 50 HP and 35 ft lbs of torque. Is that about what it should be puttin out?? What are some tips/mods I can do to get more horsepower & torque?
 
Keep in mind that dyno hp readings vary from one to the next, from operator to operator, and even depending on the weather.
 
reddirtrider said:
Keep in mind that dyno hp readings vary from one to the next, from operator to operator, and even depending on the weather.
Click to expand...


Could be that site is showing DIN rated HP too. I know there is a difference between DIN and SAE ratings but I don't know which way it goes without.... oh here, check this:

http://tinyurl.com/lter86 it looks like about 70hp after converting from Kw

/\/\ac
 
my brother has a dyno and i'm thinking about putting the 850 on in at some point. Then in a year or two i'll need to replace the stock exhaust then perform another run with V&H to see the difference.
 
50 hp sounds about right to me. There are losses getting the power to the ground compared to mfg ratings that are at the crank. My guess is that if the dyno were corrected for things like weather and pressure factors the hp may increase a little but not a whole lot.
 
The dyno was damn accurate. My buddy's 08 Fatbob was dynoed earlier this year after in did a stage 2 upgrade. It was puttin out 90 hp. He installed bigger baffalds (the kit came w/2) which made it louder. He put it on the dyno and it was still at 90 hp. He was a lil upset about that but I thought it was slightly funny.

I plan on puttin a MAC 4-2 exhaust on (whenever it comes back on eBay) and a K&N filter. Thats about all I wanna do now cuz I wanna ride more that work on my bike.
 
That does sound about right, a 1000 is only mid 80's (stock... at the crank) right?
 
Probably...ANY HP rating, be it from a manual, or or brochure or whatever is AT THE CRANK. Dyno ratings will vary from dyno to dyno, dpending on the program, calibration, operator, ambient interference, etc etc...50HP sounds pretty good, considering i believe that the 650 is rated at 67HP at the crank, a 17HP reduction thru the drive chain is a little much, but not completely out of the realm of reality...what a Dyno, IMO is best for is simply assuring that the bike is operating at desired levels THROUGHOUT the operating range, that there are no sharp spikes in power output, unless its desired etc etc.
 
yep there is more HP at the crank on a eddy brake dyno compared to an accelerometer dyno.

the transmission and chain take 15 ~ 20 % right off the top
 
I don't really think I want to know what the dyno info for my bike is. It definitely feels fast for an old bike, and I can guarantee that it is faster than it was when I got it. Besides, we all know these bikes aren't actually fast so much as they are vintage-fast.

To me fast is a feeling, a perception. If your bike feels fast, a concrete number is more likely to disappoint than not.

Try to think of horsepower ratings as analogous to how many previous 'boyfriends' your girlfriend has had. It definitely effects performance, but do you really need to know the exact number? It might not make you happy.
 
beergood said:
I don't really think I want to know what the dyno info for my bike is. It definitely feels fast for an old bike, and I can guarantee that it is faster than it was when I got it. Besides, we all know these bikes aren't actually fast so much as they are vintage-fast.

To me fast is a feeling, a perception. If your bike feels fast, a concrete number is more likely to disappoint than not.

Try to think of horsepower ratings as analogous to how many previous 'boyfriends' your girlfriend has had. It definitely effects performance, but do you really need to know the exact number? It might not make you happy.
Click to expand...

Hey, I like your last paragraph. Yes, sometimes it's better not to know.

I only put my 850 on the dyno because I wanted to measure the increase in performance over stock numbers. I had a Aussie dyno test done in '79 to compare with. The Aussies got 57 hp at the wheel, mine did 73 hp. I'm pretty rapt with that. HP increased by 28%. Torque increase was even more impressive, but the Aussie curve was pretty flat in the 3000 -5000 rpm range and didn't improve as much as I would have expected to red line. I think their needles weren't set right.

I'm still running stock carbs and airbox too.
 
trippivot said:
yep there is more HP at the crank on a eddy brake dyno compared to an accelerometer dyno.

the transmission and chain take 15 ~ 20 % right off the top
Click to expand...

I agree with this.....After an engine build on a souped up cage, I went to the dyno and pushed 625hp to the wheels. I was expecting more, and kind of bummin, but after I accounted for the drive train loss.....All was good:cool:.......tranny and chain ( or shaft) eat up some power:D
 
beergood said:
I don't really think I want to know what the dyno info for my bike is. It definitely feels fast for an old bike, and I can guarantee that it is faster than it was when I got it. Besides, we all know these bikes aren't actually fast so much as they are vintage-fast.

To me fast is a feeling, a perception. If your bike feels fast, a concrete number is more likely to disappoint than not.

Try to think of horsepower ratings as analogous to how many previous 'boyfriends' your girlfriend has had. It definitely effects performance, but do you really need to know the exact number? It might not make you happy.
Click to expand...

I dont care who you are..THAT is funny! And so true too...:-k
 
beergood said:
Try to think of horsepower ratings as analogous to how many previous 'boyfriends' your girlfriend has had. It definitely effects performance, but do you really need to know the exact number? It might not make you happy.
Click to expand...

This is classic LOL:D
 
my first bike I put on the dyno at M.M.I. phoenix was a CB 750 s o h c stock cam no porting 836 piston kit. this bike would get to 130 along with the 1000 sport bikes that my buddies had. not as quickly but still went ton up.

45 hp I did not get a torque spec-- I was soooo disappointed. but if 45 hp gets a ton on the speedo I figured hmmm... 100 horse will tear yer eyelids off.
 
trippivot said:
my first bike I put on the dyno at M.M.I. phoenix was a CB 750 s o h c stock cam no porting 836 piston kit. this bike would get to 130 along with the 1000 sport bikes that my buddies had. not as quickly but still went ton up.

45 hp I did not get a torque spec-- I was soooo disappointed. but if 45 hp gets a ton on the speedo I figured hmmm... 100 horse will tear yer eyelids off.
Click to expand...

Good info. Most people's HP expectations are unrealistic. I think it comes from comparing hyped up factory figures after doing additional mods, and they end up disappointed.
 
I had a FZR400RRSP a while back. This is a Jap import yamaha. I had it dynoed and it was rated at 54hp. It was a blast to ride but only topped out at about 130mph with my big arse on it. I then installed a YZF600 motor in the chassis and it was then cranking out 86 hp. Boy was it fast but I actually preferred the 400cc engine over the 600cc mill. With the smaller motor I could flog it everywhere and had no worries at all. I miss that bike.


http://i235.photobucket.com/albums/ee295/dgramo/101_0575.jpg

101_0575.jpg
 
when i bought my 1981 gs1100 e the motor was just rebuilt using a wisco 1 mil over kit , web cam ect ,,,, they had a dyno sheet that showed 127 hp . i thought this was a complete bs line from the builder . how much should a gs 1100 put out ?
my buell puts out 101 to 104 depending on weather but its got racing heads , pistons , cams , modual , supertrapp exhaust and carb work out the wassso
buell has to have 93 octane with a booster or it pings
 
Last edited:
You must log in or register to reply here.
Back
Top