K,KenP hit it on the head.In your original question I think you meant can you increase your V1 to'135'as opposed to '130'as stipulated-YES if the braking will stop you on the runway upon a reject at 135..
One normally takes the V speeds for the actual weight-then go into the charts and see the gross weight V1(to provide the Acc/stop)..You can now see the variance between the speeds..BUT the discipline
is to reject at YOUR vef prior to VI..
When we first acquired the Airbus 320 we had rediculous V1's (about 112knots-light weights)..we raised the issue with the company that they expected one to reject at failure below V1 on an 11000 foot runway-the firm got back to Airbus who stipulated that due to the braking efficiency the V1 speeds could be just below VR,and still stop in the 'required/weight distance'.
This simplied all the calculations and that is why the 2 V speeds are close tegether except in the gross weight case.
Reducing the V1 only applies in the WET runway case in conjunction with the reduced screen height(15')..whereas one can stop a little(sometimes 10knots)sooner on the wet surface,BUT one also has to accept the fact one will cross the screen lower(than dry) in the continued takeoff case..
