1/4 mile time help

[Gizmo 007]

I need your help again guys. I need the formula for converting 1/4 mile times / speed / etc.



I marked off a 1/4 mile section of deserted road and ran it. I hit 91 MPH in that 1/4 mile length . Now I need to figure what time that would equal. This truck just keeps getting better . Bomb on!



Hey TractorNut, the box is your's whenever you want it. I think I can spare it for a week. Might go into withdrawals though .

 

[R.ebel]

Formulas

http://home.twcny.rr.com/mcss/formulas.html

 

[JyRO]

My calculations...

Gizmo - I've got some formulas I've taken out of a Mopar magazine.



According to the formulas I have, you would be running ~14. 98 sec. ET in the 1/4 mile (That's assuming your truck weighs 7,400 lbs. including driver). How much do you think it weighs including driver? I can put that weight in and be more accurate.



These formulas have been extremely accurate for gas motors, but I've found the H. P. calculations to be inconsistent with diesel motors. Maybe its because the Cummins' is turbo-charged, I'm not sure. But... using the 7,400 lb. weight again, my formulas say your putting 435 H. P. to the ground. Does that sound realistic?



- JyRO

 

[MikeR]

It sounds like my 1/4 runs. I get 91mph with my 6spd and I'm clicking off 15. 7-15. 8 seconds,and the dyno says I've got 406hp.

7300 lb quadcab longbed 4x4.

 

[Gary C]

What about getting a G-tech??????



0-60

et

mph

hp

It does a lot of different functions.



http://www.gtechpro.com/prod.html



Genos has them for a better price.



Hope this helps



BTW, I love mine.

 

[Gizmo 007]

Thanks for the replies. I also got a few formulas and figured 14. 9. I weighed my truck one day and got 7550. So your calculations are close.



I still don't think I turning 400 horses. Check my sig, an EZ, a set of BD step 2's and a BHAF?

 

[JyRO]

About what I figured...

Like I said, for some reason, on the diesel engines, it seems to be less accurate calculating the HP. The times seem still OK. It was dead nuts accurate on my 425 lb. sportbike, and 5,300 lb. Suburban. Maybe its got something to do with being turbo-charged.



For instance (and this is what the gas trucks see too), our trucks are a little slow off the start due to the mass of the trucks and the mass of the engines, but on the far end of the track, once the engine is spinning, due to the large HP, TQ, and turbo, the mph is really high (that's why the gas truck drivers do this as we're passing them on the interstate at 90+ mph).



I'd guess the formula is not as accurate with any turbo vehicle, but especially for a big heavy turbo truck that leaves so slow, but rocks so hard on the far end. That's all I can figger.



- JyRO

 

[MY6EATSV8'S]

It was close on my runs, at least in the beginning when I was running high 15's. I havn't run it in a long time so can't say recently. The math says 612hp for 12. 67 at 6300lbs. I believe I'm making considerably more on a dynojet, some people say a mustang is closer to realistic. I don't know, the last time I dynoed I was making 590, I have bigger injector,camplate,lpg,nos, and turbo. I should be making more.

 

[Mopar-muscle]

14. 38 @91. 7 here , 6682 lbs ... gizmo , you have a stick , times will not be that good because you loose boost when you shift , unless you are planting your foot on the floor and never lifting on the shift ... go to the track , i wouldn't be surprised to see you doing a mid 15 run , MPH is HP , time is torque , even a Gtech isn't completely accurate , nothing beats the dragstrip to tell you what you are really doing ...



miker. i hit 409. 6 on a dynojet ... and i think thats a tad low .