True BHP

[RedHP]

Does anyone know the most accurate method to record bhp?
In the past some folk on here have suggested that the rolling road method isn't very accurate.

I have installed the Superchips (Bluefin) remap which suggests an increase of approx 45-odd bhp (to around 250 bhp), but their own test on a Mk6 GiT on a rolling road highlighted a max bhp of 270-odd. To me this doesn't sound right, but I could be wrong.
I am just interested to find out my GiT's actual current performance, as this will provide me a benchmark for my next vehicle.

Any idea's for the most accurate reading?

Red

[Snoopy]

Find a dynodynamics rolling road much more accurate than most.
Also compare before and after. Most mk6 will be 207 standard give or take a couple bhp if not take the accuracy into question. 
I hope to get mine onto the same rollers that Ken will have his superchipped one on

[PenguinGTI]

Hi Red,

When it comes to Rolling Roads, the importance really is the difference between the standard and mapped figures, rather than the maps themselves.

For example, say a standard GTI produces 208bhp, and then once mapped the same car produces 258bhp - this equates to an increase of 50bhp.

Take another GTI, tested on another Rolling Road, that produces 232bhp standard and then 272bhp remapped - this is an increase of 40bhp.

IMO, the 258bhp car might in fact be the quicker of the two, despite the latter car producing a higher figure. The reason for this is the increase over standard.

Secondly, bear in mind that remapped/modified cars deliver their power quite differently to standard cars with similar power. A good example is the difference between a Stage 2 Focus ST (280bhp approx) and a Focus RS (300bhp). Many Ford owners who made this switch were disappointed with the RS because it didn't deliver with the same energy as the tuned ST.

Within the VAG stable, such a comparison may be made between a tuned GTI and an R. At 265hp the GTI will be a more energetic car however the R will be smoother and more linear.

[Ess_Three]

Find a dynodynamics rolling road much more accurate than most.

I've had some hopeless figures from DD dynos over the years.

My personal choice would be a MAHA, as used by the likes of Porsche. Every standard car I've ever had on a Star Performance's MAHA has made bang on standard numbers.

Then, as you say, anything above that as you tune, is a real gain.

[Jimmymature]

Does anyone know the most accurate method to record bhp?
In the past some folk on here have suggested that the rolling road method isn't very accurate.

I have installed the Superchips (Bluefin) remap which suggests an increase of approx 45-odd bhp (to around 250 bhp), but their own test on a Mk6 GiT on a rolling road highlighted a max bhp of 270-odd. To me this doesn't sound right, but I could be wrong.
I am just interested to find out my GiT's actual current performance, as this will provide me a benchmark for my next vehicle.

Any idea's for the most accurate reading?

Red

I had mine stuck on a 4 wheel drive capable Dyno Dynamics that is supposed to one of the most expensive in the country at West Tuning at the Thruxton Circuit.

209 BHP after three runs, exactly what it should be.

http://www.jkm.org.uk/performance/dynotesting.htm

The above link is said to be the most comprehensive overviews of Dynos out there by a very well respected company.


Jim

[KennyGTI]

Am sure I read on seat cupra net ages ago that u can do it accurately via vagcom, taking mass air flow logs and a load of other things that were a bit over my head! Best thing to do is get it on a dyno but most dynos will give different readings hence the saying "dyno lottery" 

[R32UK]

Find a dynodynamics rolling road much more accurate than most.
Also compare before and after. Most mk6 will be 207 standard give or take a couple bhp if not take the accuracy into question. 
I hope to get mine onto the same rollers that Ken will have his superchipped one on

This is pretty accurate 

[Snoopy]

[Keithuk]

This will depend on the chassis dyno and software. A chassis dyno generally calculates the power at the road wheels but some calculate the power absorbed through the transmission on the overrun. When we had our SUN RAM XII 20 years ago we bought software that calculated this obviously the newer ones should have this inbuilt.

[SteveP]

I currently like Maha's as they showed my new big turbo kit as producing 427bhp but I know on a Dyno Dynamics Roller I would see somewhere around 400bhp, so for me I take the average of the two