how much crank hp does my car make?

[pontiacfreak142]

dumb question, i know. I have a guy that is interested and wants to know how much power the motor makes. I know there is no way of getting an exact awnser short of putting it on an engine dyno, but i figure i would get a few guesses from people that might have a good estimate. The car put down 225 whp and 230 tq through a 4l60e trans with a some what loose 3500 stall, 1 piece steel drive shaft, torsen posi unit with 4.10 gears.

[Patterson]

On an 18% drivetrain loss I'd say 265/271ish.

[CRed05]

~260hp using 15% drivetrain loss.

[AWW$HEEET]

not enough

[Ramsey]

if your guessing anyway just say 300.

[pontiacfreak142]

if your guessing anyway just say 300.

 

honestly, that was around what i was gonna guess. I know they usually say its like 15 percent loss through a manual trans, but i have an auto with a bigger stall converter which ive heard can hurt dyno numbers.

[Dr. Pomade]

I'll need to know if you actually want to race or not. Because it kind of goes like this:

 

- if you want to race, then you take whatever you say your car makes and add 200hp to it

 

- if you don't want to race and instead just want to hang out in a parking lot and talk, then you take whatever you say your car makes and subtract 200hp

[Tripleskate]

280-300

[Buckeye1647545503]

Tell him 400 if bottled

[pontiacfreak142]

I'll need to know if you actually want to race or not. Because it kind of goes like this:

 

- if you want to race, then you take whatever you say your car makes and add 200hp to it

 

- if you don't want to race and instead just want to hang out in a parking lot and talk, then you take whatever you say your car makes and subtract 200hp

 

i do race lol

[Xyster101]

If they are really a car person, all they should care about is the wheel hp. Then add about 15-20% to that for engine hp.

[mrtbolt64]

Actually its hard to judge an automatic car on a rear wheel dyno because of converter slip. Only way to get a rough estimate is to run it at the track and use the numbers there to back figure.

 

look up wallace racing calculators and plug in your numbers

[Patterson]

Actually its hard to judge an automatic car on a rear wheel dyno because of converter slip. Only way to get a rough estimate is to run it at the track and use the numbers there to back figure.

 

look up wallace racing calculators and plug in your numbers

 

Thats where I git the 265ish

[kirks5oh]

yeah, it can be deceiving with an auto. my cobra laid down 580 rwhp with the previous tune and a 6 speed. i just had an automatic intalled and the car laid down 520rwhp with no other changes---same a/f ratio all the way across the board, same fuel parameters, same boost. quite a bit is lost through the torque converter. i haven't driven the car yet, so i can't comment on whether it feels faster or not

[nurkvinny]

Your HP computed from your vehicle ET is 223.85 rear wheel HP and 248.72 flywheel HP.