sorry to bother you but could you tell me what the maximum item flow rate is for hqm pipe please

It's controlled by the config file and is based on the flow rates and the update rate.
By default or is set to move 50 items every 2 seconds.

what is the maximum i can set it to like 1000, 10,000, 100,000 ect

There is no hardcoded limit. I've never stress tested it.

so i tried changing the filter from 42 to 84 and pipe distance from 64 -128 and flow to 10,000 and broke the flow rate. after putting the filter and the distance back to what they where it accepted the 10,000 flow rate. just to let you know ty.