HP Calc.

[65notch]

anybody know a site that has a horsepower calculator that uses 60ft, 1/4 et, gears, etc to estimate rear wheel hp? thanks
ps. i did a search but didnt find anything, only engine sims

 

[classic boost]

try: http://www.hardcore50.com/members/calculators.htm

 

[65notch]

whats the weight of a 65 coupe 289? 3000?

 

[classic boost]

yeah, that should be close ballpark.

 

[65notch]

thanks..... these numbers im comming up with are depressing. ouch i think i need heads

 

[geostang351]

What are the numbers?

 

[180 Out]

The formula is rear wheel hp = weight x (trap speed/234)^3. Therefore, the higher the weight, the more the hp. 3000 lbs may be too high for a '65, maybe not. Flywheel hp = rear wheel hp/.80 for an automatic, hp/.83 for a stick.

 

[mustangdave]

Is it just me or are these calculators whacked? Is asks for h.p. and weight. A 200 h.p. car w/300 lb. ft. of torque will be faster than the same weight 200 h.p. car w/ 250 lb. ft. of torque, so how can it be accurate?

 

[Dothang67]

The formula is rear wheel hp = weight x (trap speed/234)^3.

What exactly is trap speed?

 

[180 Out]

Is it just me or are these calculators whacked? Is asks for h.p. and weight. A 200 h.p. car w/300 lb. ft. of torque will be faster than the same weight 200 h.p. car w/ 250 lb. ft. of torque, so how can it be accurate?

I think the answer is, yes, the hp-based ET calculators are whacked. They will generally tell you that the same hp that will achieve a 102-103 trap speed will also give you a 12.99 ET. The truth at the track is, only if you get a monster hook is a low 100's trap going to be good enough for 12's. The ET-based hp calculators are whacked too, for the same reason. A lot more goes into ET than hp and weight.

On the other hand, the trap speed-based hp calculators tend to be pretty close. Somewhere there's a web site that explains the physics behind the formula, rwhp = trap speed x (weight/234)^3. But even so, the formula assumes a constant rate of acceleration, which is impossible to achieve in real life. But it's not impossible to get close. That's why the formula works as a guesstimator.

Editorial comment: with the proliferation of Dynojets and similar chassis dynos, people are getting much too obsessed with their hp output. A dyno is useful for tuning, but so is trap speed at the track. IMHO it's a waste of money if all you want is to get a number to brag about.

 

[65notch]

the hp numbers i were getting where right around 260 fwh and 225 rwhp.

im trying to get a good idea of what she puts out just so i have something to go by as i work on improvments.

what does a stock 289HI-PO put out from the 60s?

 

[Cobain03]

whats your mods?

 

[67Dylan]

Editorial comment: with the proliferation of Dynojets and similar chassis dynos, people are getting much too obsessed with their hp output. A dyno is useful for tuning, but so is trap speed at the track. IMHO it's a waste of money if all you want is to get a number to brag about.

I couldn't agree w/you more!! It's just a tool, a good one at that, but it doesn't tell you what's king... ET baby! When I had a custom cam by Ed Curtis I talked about HP. He stopped me and asked what was my ET goal. He said he could grind a dyno queen or an ET king... went w/the ET king.

Tune at the track. One item at a time. Let the ET tell you which way to go and when to stop.

65notch, next time you go to the track PM me. I wouldn't mind tagging along and helping you out if you needed it. Speedworld isn't that far from my house (20min)... plus would be nice to meet you & check out your ride.

 

[68RustBucket]

the hp numbers i were getting where right around 260 fwh and 225 rwhp.

im trying to get a good idea of what she puts out just so i have something to go by as i work on improvments.

what does a stock 289HI-PO put out from the 60s?

Ford advertised 271hp at the flywheel, I believe

 

[65notch]

67dylan, will do..im watchin the weather...maybe this upcomming week..it will be humid but i can deal with that instead of 115. ill let u know

 

[65notch]

whats your mods?

289 .030 over
Edel performer rpm intake
600 4bbl carb
performer cam(i think)
9.2:1 CR
stock heads w/ 1.6 roller tip rockers
Tri Y headers, 2 1/2 dual w/ H-pipe
MSD ignition,

non engine mods: electric fuel pump and fan. alum rad. t-5 trans, 3.55 LSD rear.

think thats bout it

 

[LUCAFU1]

I couldn't agree w/you more!! It's just a tool, a good one at that, but it doesn't tell you what's king... ET baby! When I had a custom cam by Ed Curtis I talked about HP. He stopped me and asked what was my ET goal. He said he could grind a dyno queen or an ET king... went w/the ET king.

Tune at the track. One item at a time. Let the ET tell you which way to go and when to stop.

65notch, next time you go to the track PM me. I wouldn't mind tagging along and helping you out if you needed it. Speedworld isn't that far from my house (20min)... plus would be nice to meet you & check out your ride.

ETs is whats its all about, although AZ ETs will make a grown man cry

 

[Cobain03]

289 .030 over
Edel performer rpm intake
600 4bbl carb
performer cam(i think)
9.2:1 CR
stock heads w/ 1.6 roller tip rockers
Tri Y headers, 2 1/2 dual w/ H-pipe
MSD ignition,

non engine mods: electric fuel pump and fan. alum rad. t-5 trans, 3.55 LSD rear.

think thats bout it

That is REAL close to mine.
bored 30 over, performer intake (rpm coming soon), 600 holley, same spec cam, stock heads, tri ys with H.
i put down 218, 269