180 Out said:The formula is rear wheel hp = weight x (trap speed/234)^3.
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.mustangdave said: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?
180 Out said: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 said: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 said:whats your mods?
67Dylan said: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.
65notch said: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
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