How much power does it take. Say to over come 100LBS?

 

Depends. There was a conversion ration for that somewhere I can not remember where though. They took into account if it was "rotating mass." You know like heavier tire/rim, drive line. Things that are rotated directly in correlation with the rotation of the motor. Or just the extra weight. Someone help me out with this.

Jason

 

bump

 

in your sig, you have:

91 civic hatch
210.5 HP 138.8 tq. profab
1/4 mile??????

i'm going to guess the hatch weighs about 2400 Lbs. with you in it, and the 210.5 HP is at the wheels (correct me if i'm wrong on either of these assumptions)

1/4 mile time = [(weight/whp)^0.3333] * 5.825

= 13.1 seconds

if the HP you gave is at the crank, i would knock off about 12%, giving you 185 whp and a 13.7 second time (all assuming you can get decent traction)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RemoveGiantWingOnYourCar &raquo;</TD></TR><TR><TD CLASS="quote">in your sig, you have:

91 civic hatch
210.5 HP 138.8 tq. profab
1/4 mile??????

i'm going to guess the hatch weighs about 2400 Lbs. with you in it, and the 210.5 HP is at the wheels (correct me if i'm wrong on either of these assumptions)

1/4 mile time = [(weight/whp)^0.3333] * 5.825

= 13.1 seconds

if the HP you gave is at the crank, i would knock off about 12%, giving you 185 whp and a 13.7 second time (all assuming you can get decent traction)</TD></TR></TABLE>

whats the ^0.3333?

can you do 2700 with 400who?

 

I hope the car runs faster than that. A friend of mine ran 12.1 with 188HP in his gutted CRX. another buddy makes 220 and his car is heavier than mine. I'm just curios how much HP it takes to overcome weight . BTW me and the car probly weigh 2150.

 

Power
Weight 200 250 300 350 400 450 500 550 600 650 700 750 800
1,800 9.00 7.20 6.00 5.14 4.50 4.00 3.60 3.27 3.00 2.77 2.57 2.40 2.25
1,900 9.50 7.60 6.33 5.43 4.75 4.22 3.80 3.45 3.17 2.92 2.71 2.53 2.38
2,000 10.0 8.00 6.67 5.71 5.00 4.44 4.00 3.64 3.33 3.08 2.86 2.67 2.50
2,100 10.5 8.40 7.00 6.00 5.25 4.67 4.20 3.82 3.50 3.23 3.00 2.80 2.63
2,200 11.0 8.80 7.33 6.29 5.50 4.89 4.40 4.00 3.67 3.38 3.14 2.93 2.75
2,300 11.5 9.20 7.67 6.57 5.75 5.11 4.60 4.18 3.83 3.54 3.29 3.07 2.88
2,400 12.0 9.60 8.00 6.86 6.00 5.33 4.80 4.36 4.00 3.69 3.43 3.20 3.00
2,500 12.5 10.0 8.33 7.14 6.25 5.55 5.00 4.54 4.17 3.85 3.57 3.33 3.13
2,600 13.0 10.4 8.67 7.43 6.50 5.78 5.20 4.73 4.33 4.00 3.71 3.47 3.25
2,700 13.5 10.8 9.00 7.71 6.75 6.00 5.40 4.91 4.50 4.15 3.86 3.60 3.38
2,800 14.0 11.2 9.33 8.00 7.00 6.22 5.60 5.09 4.67 4.31 4.00 3.73 3.50
2,900 14.5 11.6 9.67 8.29 7.25 6.44 5.80 5.27 4.83 4.46 4.14 3.87 3.63
3,000 15.0 12.0 10.0 8.57 7.50 6.67 6.00 5.45 5.00 4.62 4.29 4.00 3.75
3,100 15.5 12.4 10.3 8.86 7.75 6.89 6.20 5.64 5.17 4.77 4.43 4.13 3.88
3,200 16.0 12.8 10.7 9.14 8.00 7.11 6.40 5.81 5.33 4.92 4.57 4.27 4.00

 

http://www.bgsoflex.com/auto.html

Try this see if it helps at all.

 

excuse my dumbness. I don't get that chart

 

Try doing a horsepower to weight ratio...
2000 lb car with a 250 hp engine equals 8lbs per horsepower (8-1)
2200 lb car would need 275 hp to achieve the same 8 to 1 ratio
You really can't factor ET's into this because of traction issues

 

Yea sorry about that did not come out very good. Here go to this. It will explain to you a little better:

http://www.roadsters.com/software/#intro

 

2150 with you in it and 210.5 whp would give you a 12.6

2700 (with driver) and 400 whp would do 11 flat

(the 0.33 is the exponential power you raise the weight/power ratio to)

 

those formulas cant be so acurate. 2150 with driver and 210whp *assuming allmotor) will deff go faster than 12.6. Just get to the track and let us know...i like all motor setups

Chris

 

LOL FASTER THAN 12.6 would be great. I guess we will see.

 

You will be on a slick correct? 22 8 13? or...

Chris

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueHatch00 &raquo;</TD></TR><TR><TD CLASS="quote">those formulas cant be so acurate. 2150 with driver and 210whp *assuming allmotor) will deff go faster than 12.6. Just get to the track and let us know...i like all motor setups

Chris</TD></TR></TABLE>

Nah, thats about right for 210whp...Depends slightly on gearing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RemoveGiantWingOnYourCar &raquo;</TD></TR><TR><TD CLASS="quote">in your sig, you have:

91 civic hatch
210.5 HP 138.8 tq. profab
1/4 mile??????

i'm going to guess the hatch weighs about 2400 Lbs. with you in it, and the 210.5 HP is at the wheels (correct me if i'm wrong on either of these assumptions)

1/4 mile time = [(weight/whp)^0.3333] * 5.825

= 13.1 seconds

if the HP you gave is at the crank, i would knock off about 12%, giving you 185 whp and a 13.7 second time (all assuming you can get decent traction)</TD></TR></TABLE>

can you tell me where those numbers come from? i was just wondering were the .33 and the 5.825 come from. sorry im just a curious math nerd

 

Yeah 22-8-13's and I have a spool front end with stock gearing

 

try this .. http://www.dsm.org/tools/calchp.htm

i used this to figure whtat hp i need to run???
or how much weight i need to take off