If you have your hp (flywheel or wheel) and the cars weight you can get a very close estimate of your 1/4 mile time. It assumes a 17% drive train loss automatically.
1/4 Time Calculator
No offense, but that is a terrible 1/4 mile calculator. Even ignoring important things like wheel spin and coef of drag, it is still a bad calculator. You can't accurately measure time just by knowing peak horsepower ratings. Without knowing the area under the power curve within each gear itself, as well as shift times between gears, no calculator could ever give a "very close estimate." Gearing is equally as important to racing as horsepower.
...so no. This should never be stickied.
I have no signiture
You like this one better? Seems a little more accurate
Try #2
Here this one has comparison tests and junk
Try #3
Whalesac wrote:No offense, but that is a terrible 1/4 mile calculator. Even ignoring important things like wheel spin and coef of drag, it is still a bad calculator. You can't accurately measure time just by knowing peak horsepower ratings. Without knowing the area under the power curve within each gear itself, as well as shift times between gears, no calculator could ever give a "very close estimate." Gearing is equally as important to racing as horsepower.
...so no. This should never be stickied.
This one accounts for all that
Done
totaly wrong from my times to what i weighed and dynod...
]:-> 287 TimeSlips In Hand. Car Still Runs Strong... 3 Differentials Later ]:->
Using the last one....
2775 lbs
320 hp
time: 12.532397791437555 secs
I'd say that last one worked pretty good
The real time was 12.536 so 12.532 is a close enough estimate for me.
I used to race cars, now I race myself.
5K PB: 24:50
10K PB: 54:26
well based on the last calculator and some reverse figuring since i've never dynoed. with my car weighing in at 3175 with half tank and me in it and my 1/4 mile time of 15.35 my car with i/h/e makes 200 flywheel hp. sick. not accurate at all.
Me....back in 2005
3056 lb
160WHP
Best (15.465@88.446) Real life
first link...15.47
Second...16.55
Third...15.57@87.55
Fourth...16.305
The first or third seem ok.
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO
going back through the first and third came out close to the same with 175 flywheel horse but that still seems high for my mods. second one was worst than the last at 205 flywheel hp
actual time: 15.647
WHP: 121
estimated at 3100 lbs
first: 17.17201941664808
second: 18.251511679168555
third: 17.172 seconds
fourth: 17.982715612283826
not very close for me at all....
to get my actual time using only the fourth one, my car would have to weigh 2050 lbs and ave 121 hp at the wheel. or it would have to weigh 3100 lbs and have 185 WHP...
1997 Cavalier Z24
Bomz Short Ram Intake
Vibrant Cat-Back
KYB GR2 Struts
Goldline 1.75" Springs
RK Sport Upper Insert
RK Sport Lower Dogbone
Custom Tune by Shane @
innovativetuning@rogers.com
15.647 @ 88.02 MPH
I think the biggest mistake you can make with these calculators is guessing at the weight. If all you got to plug into the equation is weight and HP to get an ET, then those two numbers have to be dead accurate. Otherwise the percentage either is off will be how far off your ET estimate is off.
True it is an estimate, but Pro Racers have used this equation for decades. It's not a substitute for the track, dyno, or scales. Just points you in the right direction.
For me, it helps to figure out what I need to make it into 12s, then 11s, and maybe 10s. And really that's all you
should use it for.
But, I thought it would stop the noobs from posting up "I have these mods, what should I run?" or "I drive this, this guy drives that...Who will win?"
http://www.dsm.org/tools/calchp.htm
That's the one I've always used and it's proved fairly accurate. My traps are almost always consistent with the dyno numbers i've acquired in the past. The times are not as it accounts for traction in a perfect world which isn't even close on a fwd cavy
Aside from that it's usually trap speeds that determine horsepower, not ETs
12.770 @ 111.99 Intercooled Eaton M62
What a joke!
FORGET GIRLS GONE WILD WE HAVE GOVERNMENT SPENDING GONE WILD!
Last one was not accurate said I had like 220hp when I ran a 15.2,lol but Airtonics link seemed more accurate,15.2@85mph=191hp using Et and 187hp using speed method.
15.2@89mph 2.171 60ft. 9.830 1/8 R.I.P. "LULU"
210HP
14.1 @96
some what close I guess....
Chris
'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08
I put in 2680 lbs. (base model weight) and 140 hp. for the ecotec. All of them said mid 16's except the try # 3 one, which was mid 15's and thats what most people seem to be able to run in stock ecotec 5 speeds the others were way too slow
just fyi
BIGGSZ24 wrote:Last one was not accurate said I had like 220hp when I ran a 15.2,lol but Airtonics link seemed more accurate,15.2@85mph=191hp using Et and 187hp using speed method.
Correction,15.2@ 89mph
15.2@89mph 2.171 60ft. 9.830 1/8 R.I.P. "LULU"
Airtonics link was pretty close with mine as well. 160 hp with 15.47 and 161 with 88.25 trap speed... I put in 3000 lbs, just a guess, but I assume its close.
garbage. go to the track boys and girls.
bench racing at its finest.
JBO -1
gmanz24 wrote:garbage. go to the track boys and girls.
bench racing at its finest.
JBO -1
My time as I am sure most others here posting ARE actual track times
15.2@89mph 2.171 60ft. 9.830 1/8 R.I.P. "LULU"
These are pointless because most people suck at driving and everybody is different
deflux wrote:These are pointless because most people suck at driving and everybody is different
Even a @!#$ty driver who botches a launch usually traps about the same speed. As I said earlier horsepower is better determined by trap speeds.
For example, on street tires after my engine build my car ran 13.6@112mph, on drag radials I ran 12.7@111.99.... I didn't gain any horsepower between the runs I was just able to hook up better with better tires. After I dyno again this next season I'll compare my traps with that same link again and I'm willing to bet the numbers I make and what it says I should for my car weighing 2856 w/ driver it's about spot on...
12.770 @ 111.99 Intercooled Eaton M62
Yep.
14.4-13.7
At 103.
Chris
'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08
