Rwhp From 1/4 Mile Trap?

[Super Drager]

Hey guys, just wondering if there is a way to calculate rwhp from 1/4 mile trap speed, and what time this car would be capable of with a better takeoff. My clutch was slipping on anything harder then a 2000rpm launch so i could never take off quickly.

weight: 1430kg

ET: 15.017

Trap: 97.22mph

60": 2.348

[R31Nismoid]

Well I was running 109-111mph with 220rwkw, 1480kg

So rough guess would be 130-140rwkw or so.

[seanp351]

Try this Formula it works out the same as Moroso power calculator<br style="-webkit-box-shadow: none !important; "><br style="-webkit-box-shadow: none !important; ">Need speed and vehicle weight with driver<br style="-webkit-box-shadow: none !important; "><br style="-webkit-box-shadow: none !important; ">.00426 x MPH x = = x weight <br style="-webkit-box-shadow: none !important; "><br style="-webkit-box-shadow: none !important; "><br style="-webkit-box-shadow: none !important; ">.00426 x 118 x == x 3400 = 431.8 , same as Moroso if you set speed and check against weight.

Vehicle weight must be in pounds (2.2 pounds to a Kilo) and it gives rear wheel horsepower

So in your case it would be

.00426 x 97.22 x == x 3146 = 223.49 HP

[R31Nismoid]

[Trozzle]

WAT

[Rolls]

Someone probably graphed lots of results and that is the line of best fit, = 160kw which doesn't sound too far off the mark.

[Super Drager]

I have a new clutch going in soon, hoping for a mid 14 next time around

[Super Drager]

So the general consensus is 140-160rwkw?? The car is a non turbo 300ZX.

[Rolls]

Be more like 140 max then.

[Scottydoo]

Try this:

http://www.race-cars...calculator.html

1430kg= approx 3,153lb

I got 226rwhp (166.2rwkw) for you using that page.

I used this page with my Rx7 just to see when I took it to the drags and it wasnt too far off

Edited July 30, 2011 by Scottydoo

[XKLABA]

when doing this don't forget your wieght aswell as the car, anyone know if this is rwhp or flywhp

[Super Drager]

Car would be 1500kg with me in it.

[PJ.]

Try this:

http://www.race-cars...calculator.html

1430kg= approx 3,153lb

I got 226rwhp (166.2rwkw) for you using that page.

I used this page with my Rx7 just to see when I took it to the drags and it wasnt too far off

I have always used that and same, it has always been close to what the car has run.

Having said that though, it should be used as a guideline only, as ratio's play a major factor in E.T.

[R31Nismoid]

Ye ratios make a big difference indeed.

When the OP said 1430, given its a N/A 300ZX - i simply based off my time of around 1500kg as there is no way a 300zx comes in @ 1430 with a driver

I still say 130-140rwkw with that MPH for a 1500-1550kg car

[Super Drager]

Ye ratios make a big difference indeed.

When the OP said 1430, given its a N/A 300ZX - i simply based off my time of around 1500kg as there is no way a 300zx comes in @ 1430 with a driver

I still say 130-140rwkw with that MPH for a 1500-1550kg car

My 300ZX is 1430kg without driver Since its the slicktop 2 seater version(no targa tops, no un-necessary electronics etc). It came in at 1506(or so) on the weighbridge with me in it. Diff ratio is 4.08 if it makes a difference?? Since i have a new clutch going in soon, do you guys think a mid 14 would be on the cards?

Edited July 30, 2011 by Super Drager

[R31Nismoid]

Put 16" rims on, tyres @ 20psi

There is certainly a 14 sec pass, maybe 14.8-14.7

[Guilt-Toy]

that calculator is bogus, it says my car has 700rwhp, it has 500.

r33 with 10.8 @ 135mph.

[Rolls]

that calculator is bogus, it says my car has 700rwhp, it has 500.

r33 with 10.8 @ 135mph.

It has probably been designed with a limited range of data, most likely the more common horsepower cars, eg 2-400hp range, your data is probably an outlier in the equation so of course it won't work for all cars.

All it is is a line of best fit.

[AngryRB]

phew!! atleast i can beat someone! lol..

[HEKT1K]

Sandeep has an NA 300zx.... I think he was in the low-mid 14s with ~140rwkw, so there's definitely room for improvement