kp

iTrader: (34)

See if you can figure this out, figured it would make a fun quiz..

My car usually 60s from 1.32 to 1.30 off the footbrake, always runs the same pretty much - well within a couple hundreths unless there is drastic weather changes. Ever since I put the trans brake/2 step in the car I have been cutting some way better 60 foots but the 330' have never been as good as the slower 60s off the footbrake.. Naturally the car wheelstands harder off the brake/2 step and I have been seeing some 1.22-1.25 60's with zero improvement in overall 1/8 or 1/4 mile ETs lately.

For example, last Friday two passes with an hour,

Footbrake/transbrake

1.295 60' 1.247
3.864 330' 3.881
5.623 594' 5.646
6.020 660' 6.042
113.38 mph 113.63

Doesnt make sense, .048 better 60' and .02 slower at the end and 330. This has happened many times at different tracks.

I dont have the 6.02 off the footbrake on video (it barely lifts the front wheels a foot on a launch for about 10 feet) but the 6.042 is the last pass on here using the transbrake/2 step:

http://video.ls1tech.com/video/1d9e0...4d00dedd1c.htm

Its pretty simple really, thought it would be fun to see how long it takes for someone to get the correct answer I'll send whoever answers correctly as is able to prove it with simple math a free (unused of course) bottle of Geddex burnout gaurd and geddex shoe polish.

NO-OPTION-2002

iTrader: (2)

You are using your power to puill you in the air, not down the track.

The Juggernaut

iTrader: (7)

More than likely, you are tripping the beams with the front of the nose when it comes down.
But you also hit the limiter on the 1-2 and 2-3 on the TB/2 step pass which effects ET

MADMAN

iTrader: (4)

Banging the rev limiter didnt help on that pass!!

kp

iTrader: (34)

Thats not the rev limiter, having ignition problems and the car wont rev past 6600 and I usually shift at 7100 so I hit it the same every time Friday. Still ran pretty consistant all night doing that lol.

Jugger got it though, the front of the car is coming down right at the 60' clocks and the nose is tripping the lights.

Car hits around 50.8mph on a 1.29 60 foot, thats approx 75 feet per second. Its about 3.5 feet from the center of the front wheel to the lowest point on the front of the car (intercooler pipe/air dam). Thats .0466 seconds difference which is pretty close to the 'real' 60'

I'll send jugger a powerball lottery ticket instead, he needs that way more then a bottle of burnout gaurd with what that hotrod is costing him lol.

tektrans

iTrader: (23)

So you're showing a better 60' but really it's not. I would've never figured that out. Pretty cool.

kp

iTrader: (34)

Pretty much, I would assume each timer along the route is independant and they dont add up the times between points. This has been happenening since I did the trans brake and I couldnt figure why the 60's would be so much better using the brake but the car never ran quicker then the footbrake. I was looking at those videos and in the original digital video frame by frame you can see the the 60' beam hit the air dam/IC pipe/nose just as it comes down and bottoms out.

Hrod382

hahahah I was gonna say.... I was freaking confused when I saw you had a 1.24 60 ft and only ran a 6.04.

I've seen a lot of that type of thing... More so with bracket racing where guys put "flags" on the nose of their car. That way if they're behind they can grab the breaks hard and make the nose set the ET instead of the tires, it's good for a couple thousanths if not a hundredth.

I bet that was confusing to have the same feeling of around a 1.300 and seeing that 1.24 haha

kp

iTrader: (34)

Most heads up series limit how low anything forward of the front wheels is for that reason, at the top end the car is settles down but at 150mph that 3.5 feet would only make a .015 difference in ET but .015 could be a lot in some classes I'm going to start hanging on the brakes at the end of the 1/8, maybe I can get that extra .021 to get in the 5s lol.

Its just kind of funny that the front end comes down at that exact same spot quite a few times..

SScam68

iTrader: (20)

I didn't know autos were THAT consistent .

Hey KP I was out in Knoxville a couple of weeks ago on business. VERY green. I have never seen that much vegetation in my life . Of course I have always lived in desert regions anyways . Beautiful mountain sides too!

Ok back to your regularly scheduled program

kp

iTrader: (34)

Yea its pretty green around here most of the year, not a bad place to live..

cablebandit

iTrader: (37)

Kp, regardless, still very impressive 60'...we always focus on your awesome ets but the 60' rock as well!!! I am really envious that you have your combo so consistant/reliable that you can actually disect your runs like you do. You are the poster child for KISS...I am the guy who doesnt and have the slow car to show for it.

kp

iTrader: (34)

I wish I would have kept it simple, seems the more stuff I do to try to make it better the slower it goes lately I have been messing with the thing for almost two years now though and that has a lot to do with it - plus I have had a little experience with cars at the dragstrip for a whie.

I just like to figure out why things happen, not that it makes any difference at all but at least now I can tie the front end down a little more and get some consistant 60's back. When the car is in bracket mode it will run within .01-02 all day if its on a decent hooking track which isnt bad for a supercharged car.

Yours doesnt run too bad either, if you are using the hardware you have to its fullest potential thats all you can do. I just dont have a lot of power to work with and I prefer to make 200 mid 9 second passes a year and not do anything then make 50 eight second passes a year and break parts but I'm old and tired

Shon Herron

iTrader: (25)

you notice this at the local 1/8th mile sometimes, some of the cars have a 'tow hook' under the car that actually extends past the front tires sort of, that stages them sooner than they should and obviously trips the beams on the top end before the wheels do.