Will a 1-2-3 Auto drop my ET??

[dragracer]

I've been told that a 123 auto will lower my ET. Can anyone give me advice on an average drop The bike is a conversion chassis small tire Kaw, 1425. I've never weighed the bike and have no clue as to the HP. I know, I know- you need more details- right


Bike currently runs 5.60's in the 1/8 mile. How much will the 1-2-3 help me ET wise


Thanks for the help.

[W. Baxter]

My personal experience is about 1/10th for a 1-2 and only slightly more for the 1-2-3, but the 1-2-3 seemed to make the bike more consistent. We are running about the same ET as you are but on a lighter bike.

[S2LR]

One to two tenths by going to an auto. The only caveat with using an auto is if you lift during the first part of the run, you can bend your shift forks...

[dragracer]

Bent shift forks have been the reason i've resisted the temptation of the 123. I'm just trying to weigh the potential costs and hassles of replacing forksto going quicker. Dollar for dollar it seems worthwhile to go with the 123 based on the drop in ET as opposed to more expensive motor work. Of course nitrous is an option but i want to get all i can from the horsepower package i currently have.


The only modification my bikehas is abolt on double club foot and has all the stock body work including the seat so its very, very heavy.I weigh 150lbs in leathers.Obviously the next step is to lighten up ther bike with a fiberglass one piece body,a backbone fuel cell and a light weight frontend.


How much ET can be dropped by reducing how much weight

[S2LR]

General rule is that you "may" seeone to twohundredths drop for every 10 pounds removed. You may get more or less of a result depending on where the weight is removed or placed, sprung vs. unsprung weight, etc.This, of course, is not linear as other factors enter into the equation as you lighten your bike.


For example, I replaced my Kosman forks with a pair of Koenig forks which were 10 pounds lighter in hopes of getting a better et. I saw no appreciable gain in performance. In fact, I could argue that my times got worse because of the weight transfer that was going on. Heavier weight in the front and down lowcan bea good thing. That's why the P/S guys like to mount their engines as far forward in the chassis as possible and place their ballest up front as much as possible...

[sonicrete]

The 1-2 is the most gain,maybe .1 -.2 sec,a 1-2-3 gains maybe .1 sec
additional. Total is at least .2 maybe almost .3. A full auto does not
gain much more,the gains are progressive more in the earlier gears,less
in the later gears.



You have a smoother ride,more like one long gear,since there is no
engine kill. Not having the kill is the reason for the gain and the
amount of "kill" time on your air shifter will determine the amount of
gain you get.



Backing off the throttle before you are out of the "auto" range will bend shift forks or break stuff.

[n2turbos]

I went from a std race cut tranny to a V&H 5-speed auto. I was very worried about shift forks, shift rods, that kind of thing. I wouldnt go back for the world I love that 5speed auto. The only thing that I dont like about it is the fact that its hard to keep track of what gear you are in sometimes. SMOOOOOOOOTH!!