When I was first considering a Cobalt SS/SC from my Integra LSVTEC I was trying to research cars stock WHP. V6 Accord Coupe, Civic SI, Scion tC, RSX, Neon SRT-4 etc. after I went SS/SC I went SS/TC and started building power.

I learned that (true or not, it's what I went by) most FWD cars lose 13%-15% for WHP. So if this is true then a stock SS/TC should be around 230whp.

So I stuck by this rule/guideline and I've been telling people I have around 400HP at the crank, because that's about where I dyno if you take away 13%

Anyway, what crank HP do I most likely have and have I been an idiot for saying I'm at 400HP?

http://www.youtube.com/watch?v=fOWPreilLwY&sns=em

 

well...go dyno yourself and add 13-15%. That's about how much horsepower you have to the crank

/end thread

 

You have had your car on the dyno with all mods listed? Then add that 13-15% onto your dyno number's and there you go. Am i reading this right....?

 

Okay cool because I'm at 350whp and uf I add 13-15% I am indeed at or above 400HP. So this the case then. Thanks that's what I figured just wanted confirmation.

Thanks

 

nope.. most ricers brag using crank HP .. i would too so they aren't assuming they make as much power as you lol

 

maybe im confusing myself here but how do you do that calculation? making whp to chp?

i know if u had 400 crank it would be 400x.87 =348 ...

 

lol (crank HP x .15) + crank HP

 

^ is right. with 350 WHP your at about/just above 400 crank given a 15% loss
With 13% loss your at 395 crank! That's a powerfull balt ya got there!

 

that's roughly since every dyno reads differently.

with that logic my car makes 302 HP at the crank with GMS1 and no boltons assuming 13% loss. it's only supposed to make 280 at the crank and i doubt it's a factory freak since other balts with GMS1 make similiar numbers on the same dyno lol

 

Haha..
I should start telling people bhp numbers.

 

Lol rounded to 620, that's a lot of forward power

 

Still on stock cams and it's quiet when the cutout is closed. Don't think anyone would believe it

-

 

i think ss/tc's only have a 12% loss...its been talked about on here vs. the solstice/sky guys because they have much more drivetrain loss....

 

so that means the claimed 918 whp balt on zzps website makes like 1100ish hp at the crank!?!?

 

lol, true...haha


350whp/ .88 = 397.7

 

Your math is a bit off...

If you have 400 whp, 15% drivetrain loss (added in this case, for bhp)

Don't do 400 x 1.15 = 460 .... Do 400 / .85 = 470(.588)

Because your whp is a percentage loss from bhp, not vice-versa; bhp is not a gain from whp.

 

xxxxx/////////xxxxxx........xxx///xx..x.x.x.x..x.x.x..x.x...x..x..x..x..x..x..x..x.. x..x..x..x.x..x.x.x..x.x..x..x.x..x.x..x..x.x..x.. x.x..x..x.x
========1billion hp...lol

 

What about growth? So the higher I go the more it increases. Sure at 260 the stock is 230whp or so, but shouldn't the percentage diminish as it rises.

So for example lets say i build a 1000whp beast doing the math it's a 136-176 extra horses to the crank vs the 30 extra it began with. So does it really stay true to the percentage regardless of how much I increase or is there a point I need to stop going just by percentage?

 

Excellent question! On the dyno, the actual measurement is torque at the wheels. Everything else is a calculation. So, even if the truth is that the trans only robs 20 horsepower (or whatever) it's entered in the dyno calcs as a percentage.

Horsepower is a calculation from actual dyno measurement too, and can be altered in the dyno software.

And, for us at altitude, the corrected horsepower numbers aren't even remotely close to what were actually putting down, they are a computer calculation simulating what we MIGHT put down at that corrected situation.

 

Or how about we stick to wheel hp. Way to many variables from dyno to dyno and day to day to get it right.

 

meh... it's all bench racing....

I suppose what we ought to be talking about is torque (at the wheels) curve- leave horsepower out altogether, and talk about the whole curve, not just peak torque. That, and cylinder pressure graphing. anybody got a Pico ?

 

^THIS.....

 

Don't listen to any of these haters dude. You are probly making more horsepower than you think. Juast follow this advice and you will be good
sincerely,
The guy who makes 630 whp