Impact gen1 tuning

[PCPGUY]

I just came across a gen 1 impact in .30. Is the fps in the low 800’s normal? Getting around 60ft lbs. Has high power huma reg set at about 200, hammer spring on max, and valve at 4 (all the way open). Any ideas to make faster with a little more power? Thanks in advance guys.

 

[Ydunn.223]

The gen one Impact with no heavy hammer did not like to go over 148 Bar on the reg
it would experience some valve lock but at 148 bar would shoot very consistent, I hope
yours has the 5.7mm stainless valve seat installed in it.

I'd back off on the reg pressure and see if it shoots a little faster my old gen one Impact
would shoot the 44.95s JSBs at 980 FPS

 

[PCPGUY]

Well with it shooting at 200 reg on the bar and accurate I’m hoping I do have the valve seat you mentioned but I will bring it down to 150 tomorrow and see what happens. Being around 980 with the JSBs would be great

 

[Will74]

There may be Power Plenums easily available. It does benefit quite alot.

I remember regulator being the worst thing on a Gen 1. So small. Huma did make a difference but it was still a little so so.

 

[PCPGUY]

lowered it down to around 170 and def improved

 

[MongooseV8]

I bet you are under hammered even at 170Bar. Do you know if it has a heavier hammer weight or spring? Also do you have the skinny plenum tube or the bigger Power Plenum? What barrel length is this, makes a huge difference?

My old Wildcat was faster at about 140Bar than what your rifle is doing, suggesting something is still amiss.

 

[PCPGUY]

I bet you are under hammered even at 170Bar. Do you know if it has a heavier hammer weight or spring? Also do you have the skinny plenum tube or the bigger Power Plenum? What barrel length is this, makes a huge difference?

My old Wildcat was faster at about 140Bar than what your rifle is doing, suggesting something is still amiss.

I have the skinny plenum 600mm barrel and not to sure about the hammer components. I was thinking of just starting to update everything piece by piece. Like the power block kit, slug kit, transfer port etc.

I’ll bring reg down to 150 and see what happens, hammer is maxed out

 

[MongooseV8]

I have the skinny plenum 600mm barrel and not to sure about the hammer components. I was thinking of just starting to update everything piece by piece. Like the power block kit, slug kit, transfer port etc.

I’ll bring reg down to 150 and see what happens, hammer is maxed out

I would certainly recommend the Power Block kit, you will see a nice boost in performance. And a hammer weight and spring will be opened up and easy to swap out while you are installing the Power Block kit anyway. I would consider the Huma tuning kit over the FX slug kit, and for sure get the Huma transfer-port and probe.

 

[Trucker3573]

Is the power wheel just on max or is the hammer spring truly maxed?