I am using a huben dream valve and decided to enlarge the airblock to 4.5 mm. After the mod I went from 749 fps to under 500 fps. No matter how high I set my reg I can no longer get past 650 fps. What am I doing wrong or neglecting to do?
Umarex Lost power after mod
- Thread starter rctk1
- Start date
This...
I'm somewhat new to the tuning game but the way I understand it is that it's a balance between reg and hammer spring settings. I understand it as, after you adjust the reg you'll want to adjust the HS to the knee then back off just a tad. Someone will correct me if I'm wrong.
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Yes, that sounds about right. If you think of the regulator as a door and the pressure inside the tank as a force holding the door closed, the more force being used to hold the door closed will require a stronger hit from the hammer to open it. Very crude example but it works
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Yep, then you have to consider dwell time. I think that is where port size comes into play. That pressure has to get through and into the barrel. Like I said.. I'm new to this and trying to absorb it all.
This spreadsheet is probably the best tuning tool you'll find.
Free spreadsheet from Triggertreat
Here is a free spreadsheet anyone can download if in need of one: Click here to download the free Rev 05 spreadsheet updated 11-16-18 This free spreadsheet will give all of the typical data including the efficiency if the inputs are correct along with highlighting all shots that are within a...
www.airgunnation.com Last edited:
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