Adapt 1.5 Sump Pump discharge tube to 2" outlet?

[Reach4]

http://www.pressure-drop.com/Online-Calculator/ should let you calculate pressure drop due to friction for a given flow rate. I would expect gpm to increase, but I don't know how much.

Is the exit to the dry well totally buried? I guess backpressure in the gravel-filled hole could predominate over backpressure from the pipe. It would be interesting to add a pressure gauge on a tee while you are making changes in the piping. I think 15 psi might be a good size gauge.

 

[Hidden 1]

It goes from the drywell to a small hill that then goes to a ditch ,Nothing is restricting it an it isnt underground anywhere [except the small bit in drywell at pump
].
An after about a ft from the 2 inch pipe connected at pump , instead of a 90 degree on the turn I used a 45 then 2 ftpipe an another 45 .Its actually a Wolverine Beast 1/2 hp.
I set it up now with the1 an 1/2 to 2 "adapter at pump,2" pipe, an now no weep hole an no check valve .I put it a bit deeper also.
Will see how it does over the next 2-3 days .Hopefully its faster too!