FX FX Impact Tuning Conundrum.....

[Dunk1302]

Hi All..... I'm on the tuning "steep learning curve" with my .22 Impact M4 (600mm). I have a "decent baseline" tune that gives me 990-1000fps with 23gr ZAN slugs, so now I'm looking to see if I can tweak my settings without altering the reg, to preserve my shot count and hopefully reduce my shot spread......

So - my questions:

1. I understand (I think!) that the micro adjuster increases or decreases the preload on the hammer spring - what does the macro wheel do? Is it the same thing, just in coarser increments, or does it have some kind of cam arrangement that does something different?

and

2. Right now, my macro wheel is at 15 and micro is at 4.5ish - would there be any consistency benefit from going up to 16 on the macro and down (maybe to 3.5)on the micro? Would this give less preload on the hammer spring and improve consistency?

I'm still learning "the dark arts" so any insights are appreciated!!

Cheers

Dunk

 

[CoyoteGod]

The macro and micro do the exact same thing to the hammer spring just on a different level. Macro meaning bigger and micro mean smaller. Moving to 16 would be a bigger jump of tension on the hammer than moving the micro wheel. I believe the macro is 10 fps or so and the micro is about 2 fps or so depending on reg pressure. Also remember your valve knob for dwell timing. Closing it will slow your speed slightly and at times give you more consistency and better SD and spreads. Opening it for faster speeds and to have valve open longer but it can cause turbulence on your slug as it exits your barrel if open to long. But not always do better SD and spreads equal better accuracy, test at distance for slugs. Test at least 20 rounds for point of impact variation MOA average.

 

[Jay308]

This will explain tuning and what is going on, it’s not magic just balancing hammer spring to reg pressure. This should get you going and get that 2 SD / 10 ES.

Use the Macro wheel as a quick tune, to find the plateau and the slope, then when close(at knee) use the micro to fine tune in little steps.

 

[6gun]

Hi All..... I'm on the tuning "steep learning curve" with my .22 Impact M4 (600mm). I have a "decent baseline" tune that gives me 990-1000fps with 23gr ZAN slugs, so now I'm looking to see if I can tweak my settings without altering the reg, to preserve my shot count and hopefully reduce my shot spread......

So - my questions:

1. I understand (I think!) that the micro adjuster increases or decreases the preload on the hammer spring - what does the macro wheel do? Is it the same thing, just in coarser increments, or does it have some kind of cam arrangement that does something different?

and

2. Right now, my macro wheel is at 15 and micro is at 4.5ish - would there be any consistency benefit from going up to 16 on the macro and down (maybe to 3.5)on the micro? Would this give less preload on the hammer spring and improve consistency?

I'm still learning "the dark arts" so any insights are appreciated!!

Cheers

Dunk

Don't over think it, just try some minor adjustments. It won't change things too drastically. A chrono is necessary and I'd be taking notes in cause and effect. If it groups, don't mess with it.

 

[Trucker3573]

Like has been said it is a balancing act between reg pressure and hammer pre load. As far as macro and micro think of it this way. Your amount of hammer pre load will be noted down below the micro adjuster with a pointer pointing at a number. That is the important “spot” irregardless of the two adjustments. You want to find that correct spot where everything is in balance. That “spot” is much easier to find using the micro as it changes small increments thus reducing the chance you will over or under shoot it. Think of the macro as just an adjustment range of your final tune when you find the spot. What I did was tune for the heaviest projectile I would shoot. Start with the macro on a high number. Top or near the top. Then tune to the balance spot using the micro. That way you will have the largest possible range to tune down with the macro for lighter projectiles. Of course your optimal perfect tune (assuming done well) will be for that heaviest projectile you initially tuned for. As you turn it down you will slightly start losing consistency.

 

[6gun]

The wheel is coarse adjustment the micro is ultra fine adjustment of hammer spring tension..... The real trickery comes with what reg pressure you're using and the valve adjuster. That's all over the chrono and on target experimentation. Each gun is different enough that a "recipe" is ballpark at best.

 

[bchannell]

The macro wheel is kind of confusing at first.
The micro is always where your hammer is actually at. The numbers on the side are really where your hammer tension is at.
The wheel numbers are misleading as there is an internal adjuster that puts the wheel in the "range" of appropriate adjustment.
Hard to explain but just pay attention to the micro during tuning

 

[FLgunner]

You might find this YT Video helpful. I followed Nate's video and I can now swap between .177, .22, .25, and .30 barrels with nothing more than a couple adjustments. I don't touch the regulator setting, I just set the Macro wheel and adjust the valve setting per Nate's video. Very straight forward and easy to do and should work equally well when moving through different weights slugs and/or pellets if you only have the one caliber.