function query result without queryNorm

[Lee Chunki]

Hi, 

I want to add some value to score.

so, I tried to use “bf” but it returns 
value * queryNorm

for example, when I use 
q=iphone&bf=div(ms(NOW,start_time),3600000)

solr returns

  799.5687 = (MATCH) 
FunctionQuery(div(ms(const(1436268218591),date(start_time)),const(3600000))), 
product of:
    6988.394 = 
div(ms(const(1436268218591),date(start_time)=2014-09-19T07:00:00Z),const(3600000))
    1.0 = boost
    0.114413805 = queryNorm


how can I get only FunctionQuery() result ?

Thanks,
Calvin.