car rev higher on full lock

eurotrotter · Post by **eurotrotter** » 09 Mar 2011, 15:39

hey gang

i have a xsra hdi 3door coupe. and have noticed that the car revs higher when i full lock the wheel and hold it, is this normal, what is this?

i notice that the revs go a little bit above normal idle when i approach full lock also.

any ideas what this might be

thanks
ed

Clogzz · Post by **Clogzz** » 09 Mar 2011, 15:59

Just before you get to full lock, most of the pressurised oil in the power steering is returned to the tank, so as not to force the mechanism.
The engine runs faster because of the reduced load.

eurotrotter · Post by **eurotrotter** » 10 Mar 2011, 09:44

thanks clogs, for that explanations, makes sense to me after that explanation!

thanks
ed

spider · Post by **spider** » 10 Mar 2011, 10:45

I agree

Some cars (not sure if PSA have these) have a sensor in the return line and this in turn signals the ECU to increase the engine speed a fraction, only by about 100 rpm to compensate for it.