12 FPE Vortek Tune Kit In My TX200

Author Topic: 12 FPE Vortek Tune Kit In My TX200  (Read 71 times)

Offline Fred J

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12 FPE Vortek Tune Kit In My TX200
« on: April 21, 2017, 02:44:31 PM »
This week I installed a 12 FPE Vortek tune kit in my TX200 (.177 Cal). The gun in stock form was shot about 15 to 16.5 FPE, which was a little too hot for consistent accuracy, and restricted me to shooting heavier pellets to keep the velocity below 900 fps.

At any rate, I installed the 12 FPE kit, along with the included piston seal (my OEM seal was cracked) and one spacer between the piston and the top hat. Very easy to install: However, I could only install one spacer, since the gun would not cock with 2 or 3 spacers. My target was to get somewhere between 11.5 and 13 FPE from my rifle. Here are the 10-shot chrony results from the two most accurate pellets (JSB 7.33gr and JSB 8.44gr) after about 150 shots on the new spring and piston:

JSB 7.33gr
Low:856.4 fps
High: 880.2 fps
Average: 870.0 fps
Extreme Spread: 23.8 fps
Stand Deviation: 8.31 fps
Av. Power: 12.3 fps

JSB 8.44gr
Low:808.4 fps
High: 820.6 fps
Average: 813.3 fps
Extreme Spread: 12.2 fps
Stand Deviation: 3.31 fps
Av. Power: 12.4 fps

I anticipate that the spread will decrease when the spring and piston seal are fully broken in after about 500 shots. I also anticipate that the velocity will drop a little, but I should remain in my 11.5 to 13 fpe power target.

What these chrony numbers don't show is the improved accuracy of the rifle (see attached target). I am consistently shooting dime size groups out to 35 yards and dime to nickel size groups out to 40 yards. No more 'BONK' sound during the shot cycle, just a pleasant, short 'snap' sound. No more drama in the sight picture: The recoil is greatly reduced and the target remains in the scope through the shot cycle. And the gun is real easy to cock at about 24 lbs: This old guy can shoot this all afternoon and not get tired.

If your TX200 is shooting too hot or harsh, you might want to give the Vortek 12 FPE tune kit a try.
  • Sturtevant, WI
Air Arms TX200 .177 Cal
Benjamin Marauder .177 Cal
Diana 34 .177 Cal
Umarex Fusion .177 Cal
Crosman 38T Revolver .177 Cal


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Re: 12 FPE Vortek Tune Kit In My TX200
« Reply #1 on: April 21, 2017, 05:31:56 PM »
Those are good numbers Fred.
I had the motorhead put a 12fpe VORTEK kit in my HW35.
It is a short cocking type as you know.
840fps and just short of 12fpe with 7.33 JSB pellets.

Many of my friends (US and abroad) believe the TX200 platform was designed for 12fpe..
  • Fairfield, California
AA TX200 MKIII, .177
Baikal IZH46M w/Steve Corcoran Furniture
Beeman R1, San Rafael, .177
Benjamin Sheridan, Blue Streak, Williams Peep
Benjamin Marauder, .177 w/Boyd's Stock
Benjamin Marauder, .25  w/ Boyd's Stock
Crosman 1720T w/Ralph Baker Furniture
Daisy Model 25, Variant #17
Daisy Red Ryder
HW35E, .177, Beeman/Williams Peep/12fpe VORTEK
RWS Diana 52, .177

GTA - What's been your success with air gun target practice?