mapping for torque instead of power

[bozothenutter]

Hi,

What would the difference in bhp be if you'd map a car for max torque instead of max power?

or can you have your cake and eat it, and have both...or is it always a compromise (think I know the answer to this one)

 

[LIL B]

BHP=torqueXrpm/5252

 

[Samco77on]

you always map for max torque throughout the rev range. then power is determined by the RPM.

they are linked using the following formula.

Horsepower = (torque x RPM)/ 5252

so if an engine makes 170 ft lb at 5500rpm it will make about 178 bhp at 5500rpm.

say that torque drop slightly to 160 ft lb as it gets to 7800rpm the power at this rpm will be about 237bhp

 

[TheEvilGiraffe]

^ Beat me to it !

Wiki - power, torque.

Not sure you even begin to understand the fundementals of either at the moment...

To increase torque on an NA engine, pulse tuning the exhaust, changing to a 4-2-1 manifold, or enlargening the cylinders to enable a larger piston (more area = more downward pressure in turn rotating the crank) could give you more torque, but it's not really as simple as that.....

Hope that helps, but probably doesn't at all and someone will pick holes in it ...

 

[bozothenutter]

wow that was quick, i've been reading a.graham bell's book on 4 stroke tuning..very enlightening...will pick something up on engine management after this, any tips?

 

[Andyman]

Iv always had above average torque levels from the 172 with basic other modding. Pretty sure the reason why has been the headwork

 

[bozothenutter]

what headwork was done, and by whom?

 

[Andyman]

Ported, polished, light skim and valve seats cut 3 angles. Initial work was carried out at a local engineering place and then perfected by AWT (angel works) via GDi years ago.