Rolling Road BHP figures

[Zonda]

Just interested in your opinions, when it comes to Rolling Road BHP Figures (at the wheels). It seems pretty common that the figures a Rolling road show are approx. 20bhp lower than the Quoted BHP for that particular car.

So, a standard 172 might show approx 150BHP ... a V6 might show approx 220BHP....etc.

Kinda puts you off wanting to put your car on there, as they always show much lower power figures than your standard car should be showing!?

What are your thoughts please?

 

[Gareth]

my 172 was 169bhp, and it was on regular unleaded, not the usual optimax, good enough for me (power engineering RR)? are we talking fly or wheels?

 

[McBunny]

he said at the wheels

 

[telford_mike]

RRs are good for comparing output from different cars, but pretty useless for measuring absolute values.

 

[Zonda]

...oh..



I was looking at these..



http://www.cliosport.net/members/MemberTable.asp?CC=RRhttp://www.cliosport.net/members/MemberTable.asp?CC=RR

 

[viceroy]

not really since we all know there are losses due to transmission etc.

 

[TheCake]

Quote: Originally posted by Zonda on 20 May 2004


...oh..



I was looking at these..



http://www.cliosport.net/members/MemberTable.asp?CC=RRhttp://www.cliosport.net/members/MemberTable.asp?CC=RR





How did you manage that when your not a member? 1 star ????

 

[Zonda]

My mate is.. asked me the same question last night.. and emailed me the link.

 

[McBunny]

well on a fwd car your looking at about 15-17% losses so thats about right 150 at the wheels makes it 172.5

 

[Chris n nic]

It just shows the difference between rollers. Waynes Cup had 162 ATW with just a zorst. On average a Cup with zorst/decat, rsport, filter would get about 150-154 ATW I would have thought.

Chris

 

[Zonda]

ok.. thanks, worth knowing that before u see the results from a rolling session. Thanks.

 

[BenR]

losses increase with output, so its nota constant 20bhp loss.