calculating bhp via vagcom

Post by **quattronutter** » Fri Oct 12, 2007 10:08 pm

can someone confirm the magic formula to calculate approx bhp?

Post by **CliveH** » Fri Oct 12, 2007 10:17 pm

Take the peak MAF reading on a FATs run (4,200 to 6,500rpm in 3rd) and divide the figure by 0.8.

Not sure how reliable it is, but it seems to be a generally accepted rough and ready rule of thumb for these cars.

Post by **quattronutter** » Fri Oct 12, 2007 10:25 pm

cheers,

doug did tell me but totally forgot,0.8 seems to work out about right

Post by **shineydave** » Fri Oct 12, 2007 10:48 pm

or log the torque and use this simple formula

BHP = 2 x pi x torque x revolutions / 550.
Pi is 3.1416, torque is in pounds-feet and revolutions are revs per second.
Obviously, we can change the revs to revs per minute, easily!

Here's another version:

BHP = 2 x pi x torque x rpm x 1.34 x 10 to minus third power / 60.
For this formula BHP is in horsepower and torque is in Nm

Post by **CliveH** » Fri Oct 12, 2007 10:53 pm

All very scientific Dave, but I'm reliably informed that the torque measured by Vagcom is at best pretty vague...

Post by **GrahamS4** » Sat Oct 13, 2007 9:18 am

The peak maf/0.8 came out so close to the figure I would expect compared to my dynop results (power at wheels) that I personally think it's as good an inidcation as any, certainly for stage 1/2 cars. Not sure if it works it's way out ofd tollerance the more power you run.

Post by **CliveH** » Sat Oct 13, 2007 9:43 am

We'll see on 17th Nov Graham...

Post by **shineydave** » Sat Oct 13, 2007 11:25 am

i was just trying to cloud a simple issue with math, lol. i blame it all on a deep seated desire to be an accountant

Post by **CliveH** » Sat Oct 13, 2007 12:07 pm

shineydave wrote:i was just trying to cloud a simple issue with math, lol. i blame it all on a deep seated desire to be an accountant

I'd blame it on the bottle of brandy you were probably consuming at the time...

Post by **shineydave** » Sat Oct 13, 2007 1:35 pm

have you got my house wired for video?, that's uncanny. now if you were really good you'de be able to tell me the brand i was drinking

Post by **CliveH** » Sat Oct 13, 2007 2:53 pm

Martel?

Post by **IGO300** » Thu Jun 12, 2008 1:09 pm

Is this the reading from both banks under group 2 VAG or the total MAF under group 3.
My total under group 3 is 364.08 on both an RS4 and an RS6 whereas the total of both banks on the RS6 is 404.03

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calculating bhp via vagcom

calculating bhp via vagcom

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