drewwrxrogers

I was wanting to get a good idea on what traps match typically with what rwhp #'s. I know it will vary but all in all it should be somewhat close and accurate to do comparisons. Thanks

PowerShift408

iTrader: (44)

I always use this calculator. It's pretty close usually, but definitely not exact.

http://www.wallaceracing.com/accel-calc.php

That website has a calculator for pretty much anything drag racing related.

drewwrxrogers

hmm....not exactly what im looking for...couldnt get it to work anyway...strange numbers.

12secSS

iTrader: (30)

To properly figure out drag strip trap speeds, you need the actual weight and rear wheel horsepower of the vehicle in question. Anything else is just pulling a number out of your ***.

Besides Wallace's site, I also use TCI's.

http://www.tciauto.com/Products/Tech...alculators.asp

darrensls1

I just used the wallace one and it was pretty close! My previous best in decent weather was 11.76 @ 115 on a 1.60 60'. That's pretty much right on. Of course a few weeks later the temp was in the 50's with a real low DA and I got the 11.53 in my sig

But for a normal DA and temp it was right on for me. Just remember that the HP is FWHP. I put in my rwhp first and it told me 12.4 @ 108 LOL.


Power to Weight Ratio: 8.22
60 Foot E.T. : 1.63
1/8 Mile E.T. : 7.42
1/8 Mile Trap Speed : 91.63
1/4 Mile E.T. : 11.76
1/4 Mile Trap Speed : 114
1/4 Mile Trap RPM : 6,044

drewwrxrogers

Hmmm....was just wondering because I seen a couple guys talking about it in another thread and wondered if it was possible to get a good guess. Plus you always here people say...."what did you run?"...."O a 12.5"..."Ya thats about rite" haha

darrensls1

Try the wallace one linked above again. Put in your cars raceweight, shifts (2 for us autos), tire height (26" for my stock tires) and gears. Then just keep adding different FWHP numbers. If you think that your car will make 400 rwhp then use 488 HP since 18% drivetrain loss makes the rwhp 400.

Then change the raceweight if you want and see how that affects the ET and trap. It's kind of cool. Hardest part is factoring in the 18% drivetrain loss since we are all so used to rwhp numbers here and not fwhp.

drewwrxrogers

I plan on around 420rwhp @ least (Entered 500).... 2 shifts for my Stalled Auto..... And just threw in 3300 pounds for weight and got these numbers......

Power to Weight Ratio: 6.60
60 Foot E.T. : 1.52
1/8 Mile E.T. : 6.89
1/8 Mile Trap Speed : 98.60
1/4 Mile E.T. : 10.93
1/4 Mile Trap Speed : 123
1/4 Mile Trap RPM : 5,900

Seems like it may be a little wishfull thinking...... guess we shall see. If anybody has some more ideas to get a better guess for me let me know.

darrensls1

That looks about right to me for that low of a raceweight. I tried those exact numbers except I replaced the 3300 raceweight with 3700. That's 3400 for the car, 200 lb driver and 100 lb for the roll bar and gas. It gave me:

11.35 @ 118

Now look at my sig. I run 11.5-11.7 with a 3650 lb raceweight and only 370ish rwhp. If I added 40 rwhp with decent heads and 65 lb for a roll bar then I'm at 410 rwhp, 3700 lb raceweight. Thier estimate of 11.3 @ 118 is about what I figure I would run by adding 40 rwhp and 65 lbs. Maybe 11.2 @ 119 in better air but certainly close enough to consider this a decent tool for estimating purposes.

If you have 420 rwhp and you actually are 3300 lbs going down the track then I fully believe 10.9 is there. Always assuming a half way decent DA.

qwk93ta

iTrader: (13)

It was pretty close for me.....said I should run a 13.44 and my best is 13.45.

PowerShift408

iTrader: (44)

Did you use fwhp or rwhp? With my estimated setup, the numbers seem pretty optimistic using fwhp, but slower than I expected using rwhp.

MDoe8

iTrader: (3)

3300 lbs seems a bit too low. Remember to include your weight in the equation...plus the cars weigh more than that typically

KameleonTransAm

iTrader: (1)

Hmm, spit out an 11.98 to me...that seems like a stretch. Stock tires are 26"? If anything, this is just going to make me feel after I run my car for the first time.

darrensls1

Yes stock tires are 26". You guys need to remember that this calculator is strictly math and includes a decent 60' estimate. If you're running on street tires then you won't run the times it estimates. If you're an auto running on a stock stall then you won't run the time it estimates. If you're running a M6 and your shifting skills are questionable then you won't run the time it estimates. And if you're racing at high elevation or in hot weather then you won't run the times it estimates.

But if your setup is well thought out (proper stall size, gears, tires & shiftpoints) and weather/elevation are decent then it should be close. At least it was for me.

06BOMGTO

I just ran it with mine and it seems pretty close. Said I should run about 12.02 @ 112. the mile per hour is good. To bad my 60ft times suck, and I'm a slow shifter. I need DRs and a driver mod.

12secSS

iTrader: (30)

You also need to remember it is calculating the numbers based on perfect traction. If you have slight tire spin at the track, you numbers will not match and be slower.

drewwrxrogers

Pretty decent tool now that I look at it a little closer.... Ya that weight was a little bit off....forgot to add my 200lbs ***.

qwk93ta

iTrader: (13)

I used RWHP