• 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.

Horsepower figures

Leaving stop lights "briskly", I've got 40 years experience at that. It's just that popping the clutch on four wheels never frightened me. I was never afraid that my Camaro would flip over on top of me. Now two wheels, that's a different matter.
 
Then put a slick, wheelie bar & air shifter on it. Put it at 8000 & throw the clutch!!! You will see how fun it can be!!
Ray.
 
Rob S. said:
I'm thinking an expert, champion could turn a 10.7 on my 1100EZ, maybe better (99.3 rear wheel HP, no center stand).

I'm thinking I'd be lucky to run a 12.2 on her (165 lbs.). I've never raced anywhere but the streets.
Click to expand...

If we look at the theoretical potential of your bike, you weigh 165 lbs and my 1100EZ (for example) with a VHR pipe, centerstand gone, stock wheels and brakes, weighed 508 lbs with not much gas in the tank. This would make 673 lbs and with 99.3hp, the theoretical 1/4 mile time calculates to 11.02. You must understand that the theoretical time is based on the hp being used for the whole run. With your streetbike, you won't be able to use full power off the line and therefore you should not expect to match that time. Perhaps this will help you understand why blowerbike said mid-11s.

BTW if your crank is still stock it might twist under such use. My EZ was already twisted when I bought it. Also the clutch basket should have the HD kit installed if you're going to drag race it. Third, I'd suggest adding a Dyna rpm limiter since the bike does not come with one.
 
jimb12 said:
If we look at the theoretical potential of your bike, you weigh 165 lbs and my 1100EZ (for example) with a VHR pipe, centerstand gone, stock wheels and brakes, weighed 508 lbs with not much gas in the tank. This would make 673 lbs and with 99.3hp, the theoretical 1/4 mile time calculates to 11.02. You must understand that the theoretical time is based on the hp being used for the whole run. With your streetbike, you won't be able to use full power off the line and therefore you should not expect to match that time. Perhaps this will help you understand why blowerbike said mid-11s.

BTW if your crank is still stock it might twist under such use. My EZ was already twisted when I bought it. Also the clutch basket should have the HD kit installed if you're going to drag race it. Third, I'd suggest adding a Dyna rpm limiter since the bike does not come with one.
Click to expand...


smart post...
+1
 
I agree with Terry. As an engine builder, these are things I assume would be done if doing that sort of thing. Sometimes I forget people have to be walked through all of this when learning. Things I take for granted after doing it more than 35 years. Ray.
 
jimb12 said:
If we look at the theoretical potential of your bike, you weigh 165 lbs and my 1100EZ (for example) with a VHR pipe, centerstand gone, stock wheels and brakes, weighed 508 lbs with not much gas in the tank. This would make 673 lbs and with 99.3hp, the theoretical 1/4 mile time calculates to 11.02. You must understand that the theoretical time is based on the hp being used for the whole run. With your streetbike, you won't be able to use full power off the line and therefore you should not expect to match that time. Perhaps this will help you understand why blowerbike said mid-11s.

.
Click to expand...

I assume you have a model to do that calculation. I have seen such in the past, but was wondering if there is a easy on-line version you are using?
 
posplayr said:
I assume you have a model to do that calculation. I have seen such in the past, but was wondering if there is a easy on-line version you are using?
Click to expand...
The formula is:

the cube root of (weight/horsepower) then multiply that by 5.825 = elapsed time for standing start 1/4 mile
 
jimb12 said:
The formula is:

the cube root of (weight/horsepower) then multiply that by 5.825 = elapsed time for standing start 1/4 mile
Click to expand...

I thought maybe you had a frontal air drag term in there.

I looked around and there are a lot of cube root calculators except this one seems to use statistical data as well. I adjusted the data around and it did not make any sense. It goes faster than the drag case???

http://www.autosnout.com/Car-Quarter-Mile-Calculator.php

Here is another that is supposed to me more accurate, but not free and no demo versions.

http://www.maxracesoftware.com/
 
theory sucks...
practical application is where it is at....
that is the difference in pre and post internet.
pre internet you had to learn on your own....trial and error.
post internet everyone is an expert having never raced or tuned a motorcycle for performance use.
i guess what i'm saying is...
everyone is an expert now because they read it on a message board or some website.
this used to be fun pre- 2000 or so. :(
carry on........................
 
I don't need no math to figure out hp, if it gets me down the road with this on my face --> :D I be good.
 
You must log in or register to reply here.
Back
Top