Jump to content
SAU Community

Recommended Posts

And whats the difference from BHP to just normal HP.

BHP refers to an engines power with nothing else dragging it down (no mufflers/gearbox/diff/aux components etc). So in reality it is the power the engine makes before it is put into the car hooked up onto an engine dyno in a workshop.

HP is just the overall unit of measurement and can refer to anything eg. HP @ the wheels.

Lets say your car makes 330kw at all wheels whats that in BHP & HP.

330kw@wheels is around 442hp@wheels.

To convert that to BHP is more of a guessing game and gets brought up on the forums quite a lot. Most methods people say are completely wrong (percentage, fixed amount etc). The only way to truely convert it is to know the BHP of the engine, then to know the HP@wheels of that exact same engine. Work out the loss of power and use that as your "x". Then when you have more power, so in your case 442hp@wheels, add the "x" and this will be your rough lowest amount of BHP. It will naturally be a bit more than this as there will be more loss, but this can't be worked out accurately enough for the sake of these discussions. There are a lot of factors that come into play and it gets quite technical.

So just quickly as an example (I have done this one a few times in the past).

Car makes 400BHP when new.

Same car put onto a dyno makes 350HP@wheels.

Loss of 50HP.

Three years later the car has been modified with an exhaust, tune and more boost and now makes 500HP@wheels.

Add back original loss of 50HP.

The rough lowest amount of BHP is 550BHP.

However in reality it will obviously be slightly more than this as more loss has occured.

When a car is advertised brand new do they ever tell you the AWKW or is it engine KW?

Only ever BHP.

Hope that clears all that up for you.

Only ever BHP.

Hope that clears all that up for you.

Execpt sometimes those figures a kinda fudged lol.

eg the new supercharged V8 falcons, are rated at 335kws at the flywheel, but they reel off 340rwkws dead standard lol

so it would make 335kws somewhere in the rev range.

Yeah they bullshit the figures sometimes. But they are ment to be rated as BHP.

Really? They make that much at the wheels standard? Wow.

Yeah...it does make sense though, I mean the standard NA 5L makes 307kw, then they strap an Harrop HTV1900 blower on it an only make a few killerwasps more...yeah right lol

They are bloody pathetic at getting that power to the ground then !!! Obviously need some 19 x 10 on the back and 275/35/19s.

Btw each car is different. I use [(Engine Kw)-15]x 0.85 = rwkw..................

...............but then again...I'm a d!ckhead. :3some:

Edited by simpletool

They are bloody pathetic at getting that power to the ground then !!! Obviously need some 19 x 10 on the back and 275/35/19s.

Btw each car is different. I use [(Engine Kw)-15]x 0.85 = rwkw..................

...............but then again...I'm a d!ckhead. :3some:

its easier to just do HP x 0.746 (or 0.75) = KW

or the other way KW x 1.36 = HP

Execpt sometimes those figures a kinda fudged lol.

eg the new supercharged V8 falcons, are rated at 335kws at the flywheel, but they reel off 340rwkws dead standard lol

so it would make 335kws somewhere in the rev range.

Are you sure 340rwkw dead standard?? I read about one that had the boost turned up and tuned making that power.

I know they are bloody impressive but I dont think 340rwkw dead standard.

Are you sure 340rwkw dead standard?? I read about one that had the boost turned up and tuned making that power.

I know they are bloody impressive but I dont think 340rwkw dead standard.

seen a few dyno runs now...one even ran 353rwkws but is a rather happy dyno

with a tune, good exhasut and WMI they will do 400rwkws.

Cant wait for the intercooled ones, so they can throw some real boost into them

so even if we say they are all happy dynos, how many are happy by even 40kws?

edit - they run 114mph through the traps on street tyres, they weigh 1820kgs + driver

seen a few dyno runs now...one even ran 353rwkws but is a rather happy dynowith a tune, good exhasut and WMI they will do 400rwkws.Cant wait for the intercooled ones, so they can throw some real boost into them

Gearbox says no.

353rwkw so around 430kw at the engine. That's 240kw/tonne or 116 mph trap speed (minimum).

I don't think they make that power stock the gs rated 315 from factory pulls about 260rwkw then after tune without any other modifications 380rwkw. I'd say gt would be about 280rwkw at most.

Take note that once tuned the gs/gt are identical power.

exhaust, pulley, water injection

Has anyone seen what the dyno readout looks like after 2-3 runs though?<br>Massive heatsoak in the 'heat diffuser', then the PCM shuts down the maximum<div>throttle position to around 30%.....<br>One good run down the track, then an hour and a half waiting for the <br>temps to drop to normal hahaha.

</div>

Edited by TurboMick

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Latest Posts

    • The speedo's can be very conservative, when my Mazda NC MX5 speedo is showing 118kph, the GPS, and a calibrated radar.... cop mate.....hits me at around 110kph +/- 1 or 2 kph, and that is on a 215/45 17, stock tyres size is 205/45 17 as well, so weirdly conservative with stock tyre size When my Commodore speedo red 116kph GPS had me at 110kph After doing some offset and clearance measurements to see what can fit the NC on 17x8 +40, without guard rolling or rubbing anything at my current ride height, I've decided that when my tyres are toast, I'm going to fit 225/45 17 and see where that gets me IRT actual speed of my speedo and GPS/radar From the online calculator I should be still be doing around 5kph under an actual 110kph when the speedo is showing 110kph My ADHD requires that when I'm doing 110kph on the speedo, that the actual road speed is actually really close to that, and not alot slower And going from 205 to 225 still keeps the car within the %/mm allowable in the NSW vehicle rules and regulations, which is nice, as long as I'm looking at the latest version that is.....LOL https://www.nsw.gov.au/sites/default/files/2021-02/RMS-13.464-Light-vehicle-modifications-Vehicle-Standards-Information-No-6-November-2013.pdf
    • Take the value it measured as, and pick the closest range available that is above the reading on the screen.   Also, no point just testing the coils. Read what has been said again. You need to test all your wiring, everything.
    • Does the scanner do all the CUs in the car, or only the ECU?
    • @666DAN sorry to bring you and old thread.     I've got my de+t done and it's all running great other than 1 small issue.    Car has remained auto with the na auto and tcm, I've used a stagea ecu with. NIstune board and everything is great other than my gear selection on the dash. It illuminates park, reverse, neutral, 3rd and 2nd when selected . But nothing when in  drive or what gear your in when you pop it into tiptronic. I'm sure there is maybe 1 wire in the ecu plug I need to move to rectify this. Do ya have any ideas?     Cheers man
    • Well I recently changed my rear axles and was thinking if I bumped anything, I have been driving the car for a while now though... But it has been raining today so everything is wet under the wheel arches. Brakes feel fine and can't hear any of the metal screamers, I had a squeak coming from one of the handbrake drums but that seems to have gone away a while ago. I was going down a hill when it lit up and I did feel the abs bite for a second and question why it did it?
×
×
  • Create New...