NotStok

I have this friend who has an 04 GT and it's pretty quick. He's my friend and all, but I think he's a little misled by an online HP calculator.

His mods are: JLT RAI and a Pypes catted X and catback. That's it. He can drive his car, and actually belted out a 13.8 pretty consistently at the track the other day.

He entered his ET with his weight and all the other necessary info, and came up with the number of 310rwhp. I wasn't there when he did this, but he swears everything was correct, and now absolutely refuses to believe that the number is most likely off by...a bit.

I've tried to tell him that there's absolutely no possible way that he's making that much power with cold air and exhaust, and it's getting into a pretty heated debate, almost to the point where he wants to bet me money that he'll put that down if we go to the local dyno. He also thinks that the 260hp that came stock in the 2v is at the tire, not the crank.

My question is what number do you think he's really putting down? And is there something I can reveal to him that's making this number so damn high in the calculator?

1991LX5.0

those calculators are junk. Theres a guy on here named RSW that runs 12.8's with 250rwhp in a full weight car,i bet if you entered his numbers into the calculator it would come up with something close to 400

67mustang302

http://www.fastcoolcars.com/hp_calculator.htm


That one is accurate to an extent. It takes into account ET and mph, but again, how fast you shift, 60' times etc will effect those calculators as well. Same power with slicks and quick 60's would mean better ET with the same power, but those calculators can't account for that. Either the calculator your friend used is REALLY generous, or he entered his weight wrong.

JD1969

$10 says he used the GVWR on the door as his weight.

67mustang302

LOL, yeah, prolly.

NotStok

That one's a little more accurate from random numbers im throwing at it. He still refuses to believe me, even though I asked him to factor in the that he doesn't shift instantaneously, and he says the car was weighed. Ugh. I'll keep you guys posted on this battle, haha.

JD1969

According to that calculator I make 412 rwhp, I know for a fact that the current set-up only makes 377 rwhp, thats a pretty big differance IMO.

ExtrmZ

i have used the quarter mile calculators and those are pretty accurate, they cant get it down to the hundreth of a second, but it can get pretty close

Jfsram

Splitting hairs because of an online calculators is another form of internet racing. Shame on you.

Use it as a guideline and everyone will be happy.

ET is not a good form of measuring horsepower. MPH and weight is. For example. Running a stock Mustang with a crap tire on a slippery track. This can change the ET by about 1 second. 1 second is big in the calculator but did the HP change? NO.

Kmoran81

Even if you type in stock numbers its off by about 20hp at the crank