10th mile to 1/4 mile formula????

[Tony]

Hey guy's, i was wondering if there was some kinda formula to figure out what my 1/4 mile times would roughly be using my 10th mile times.

I know, just run it in the quarter... http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif
It actally ran 'fairly' strong at the South Butler drags compaired to a lot of the cars there..even though i never got out of first gear. http://www.jalopyjournal.com/ubbthreads/images/graemlins/blush.gif

I'm just qurious..eventually i'm gonna take it to the 1320, but that'll be with a 'good' motor.
not the POS thats in it.



Thanks

Tony.

[Tony]

Damn, 45 minutes and this is olmost half way down page two!! http://www.jalopyjournal.com/ubbthreads/images/graemlins/shocked.gif

I can figure out what 1/8 to 1/4 are, but nobody seems to have a 10th conversion...

Anybody run on a 10th, and run a 1/4???
maybe that would at least give me an idea..

[2tall2beahotrodder]

what did you run in the 10th.. which could help..
Im trying to do the math from a internet example..

steve-

[burndup]

Whats up with this tenth business? I thought eighth was odd enough... someone explain??

[Tony]

It ran consistent 7.50's in the 10th.

Burndup, your right, the 1/8 is odd, and the 10th is even worse.
We have one track that runs both circle and drags, and it's a 10 mile oval, so the drags are the same.
The South Butler track is an old track thats actually been out of business for a while.
They ran an event last year, and for whatever reason it too was a 10th.
Coulda been cause the track is pretty short and the shut down wouldn't be all that long for the faster cars.....

Tony.

[Mutt]

Did they give 60ft and 330ft times? It would be difficult to say (without those times) due to so many variables in the car. And even with those times it would be difficult to be precise.

As an example, your car may be running good on a short dash, but if it was wound out, it may run out of air because of carburation and cam on the top end. Gearing also plays a big part - your 60ft times may be slow, but you could pick up MPH on the top end when you get into the RPMs at higher speed. So you might have a high speed with an ET that is lower than if the car was set up properly.

8th mile drags are starting to become the thing, especially with faster cars, because of insurance. A lot of guys I know who run IHRA tracks are setting their cars up for 8th mile drags, and a lot of NHRA tracks are also running 8th mile for regular weekly programs for faster cars.

Mutt

[Tony]

Mutt, your right.
I realise there are many variables, and surely wouldn't expect anything to be precise.
I was more or less just wondering if i was in the 13,14 or 15 sec range..

I guess i'm just gonna have to hit the 'big' track at some point this year...

[SamIyam]

What kind of car do you have?

The conversion from 1/8th to 1/4 is 1.51... so a 7.50 in the 1/8th is like a low 11 second run.

But a tenth is a shorter distance... sooooo???
Sam.

[Unkl Ian]

1/10 = .100
1/8 = .125
1/4 = .250

Since .1 is less than .125,
the conversion factor would,of course,be greater than the 1.51 that Sam gave.
But the relationship isn't necessarily linear.

[Tony]

The times are from my '33 pick up.
And i know it aint no 11 second ride http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif
I'm thinking somewhere in the mid to high 13's.

Thanks for all the help guy's..

Tony.

[Mutt]

PakRat - as a guess, if you run 520ft in 7.50, you would probably be around 8.50 to 9 seconds in 660ft (1/8th mile).

I looked through some old time slips from test and tunes and found some times from cars I ran against.

1/8th - 1/4
8.49 - 13.35
8.19 - 12.89
9.35 - 14.38
8.70 - 13.54
8.56 - 13.42
8.52 - 13.15
8.04 - 12.59

Hope this gives you an idea - you're probably right
about mid to high 13's.

Mutt

[old beet]

Been down the 1/4 a few times, I've noticed first time street cars usually run about 2 seconds slower than the owner thought. Hard to bullshit at the track......OLDBEET

[Tony]

[ QUOTE ]
Hard to bullshit at the track

[/ QUOTE ]
No doubt about that!!
I also agree with you on the owners thoughts on how fast his car is. They say it's probably a 13 sec ride, but in reality, when ran it's a 15..I've seen it before..
Thats one of the reasons i was asking, maybe get some real time comparisons.

Mutt, that gives me a good idea.
Like i said, the only way to know is to take it to the quarter..
To be honest, i thought the truck was slower than it is. I had an 89 vette i ran at the local 10th mile, and it was one of the quicker cars in the 'street' class..
These cars weren't that fast, you know the typical 14 second croud if they ran a 1320.
The truck kicked it's ass in ET's, a little over half second quicker.
And if you knew what was in the truck, you'd laugh..

anyway, i really appreciate you guy's taking the time out to give me some answers to my kinda dumb question..

Now, i think i'm gonna go look for the teenager in his dads 5.0 http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

Tony.

[BigChief]

[ QUOTE ]
Mutt, your right.
I realise there are many variables, and surely wouldn't expect anything to be precise.
I was more or less just wondering if i was in the 13,14 or 15 sec range..

I guess i'm just gonna have to hit the 'big' track at some point this year...

[/ QUOTE ]


Tony,

NY International has its Spring warm-ups on April 17th and 18th. Wednesday night grudge nights start on April 21st.

You bring that old truck of yours to the track with its current combo (no new cams, carbs, gears, or anything serious - you can fix the carbs if you want though) and if it breaks 13.75 (close enough to the mid 13's for me) in the 1/4 mile I'll refund your entry fee, buy you dinner, and I'll slap a crisp 50 dollar bill right into your greasy hands...guaranteed!

The link to NYIRP is right here: http://www.nyirp.com/ you can check the schedule out right on line.

Lets do a little racing, eh?

-Bigchief.

[Tony]

Hey Mike,
I don't wanna race it until after Larry's gig. It's gotta make it down to PA and back, then i can blow it up..
I'd like to know what this shit box will turn in the quarter, as is..

I may very well take you up on that.

BUT I'M NOT TAKING NO DAMN BURGER KING as dinner if it happens to dip in the 13s http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

[BigChief]

OK. I'll buy you a steak.

....but if it doesn't break into the 13's then you gotta buy ME a steak. Hows that sound?