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Tech T bolt Test for Vibe/envy/Ionxe/Sp-1/G1

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#1 Danny D

Danny D

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Posted 14 April 2011 - 06:45 PM

So I was comparing visually the techt bolt to the stock one and was wondering if the claims techt made have any substance. So I decided to test the claim on their website:

[font="""]Lower pressure, shorter dwells, faster rates of fire, better efficiency, lower sound signature, teflon impregnation...the works.[/font]

Lower pressure:
Yes. The tech t bolt does lower the operating pressure. Chronoed the techt at ~300 fps average at 160 psi. Swapped out bolts. Chronoed stock bolt. ~272 average@ 160 psi. Put the L7 back in, changed operating pressure to 150 psi chronoed at ~272 average. (1/4 turn of sidewinder reg)

The guage is not all that accuate (as most guages are not) so figures are estimates but the trend is clear. The techt bolt does lower opersting pressure.

@160 psi with clippard QEV on an Ion xe:
- Techt bolt: 7ms critical dwell
-Stock Bolt: 8ms critical dwell

Comparing with equal chrono at 272 fps. techt- 150psi, stock- 160 psi:
- Techt bolt:7ms critical dwell
- Stock Bolt: 8ms critical dwell

SP1 with smart parts 360 QEV @ 270 fps
- Techt bolt: 12ms critical dwell
- Stock bolt: 13.5ms critical dwell

Ion xe without qev @160 psi
-Techt bolt: 21ms critical dwell
- Stock bolt: 25ms critical dwell

Discussion: The techt does provide a shorter dwell but it is a very small factor compared to the QEV. With a qevd gun, a bolt upgrade will only save 1 or 2 ms of dwell, which is very minimal.
With a stock sp-1, ion or vibe the L7 will not travel fast enough to get rid of the " low force bolt" feature. Although a 4ms difference w/o QEV will be a tad harder on paint, it will not be noticable to any extent.

Also, which i found very interesting was that an fps change of ~30 (10 psi change in operating pressure) did not affect the bolt speed at all.

Rate of fire:
As seen above a 1ms dwell difference will provide a small fraction of an increase in ROF. But this is very marginal and insignificant. The loader will be the determining factor in ROF anyways, so going from 25bps to 25.3, or even 26 wont matter.


Will test in the future. Just because the operating pressure is lowered does not mean the bolt is more efficient. This will need to be tested.

Sound signature:

Do not have the equipment at the moment to test this.

Teflon Impregnated:

Im sure it is.

FSDO- this isnt in their advertisement, but they do say FSDO can be turned off. This will be tested at a later date.

Conclusion: So far the claims have stood up. Some of the claims such as dwell decrease, and ROF increase are marginal at best. Others need to be tested.

Edited by Danny D, 18 December 2011 - 05:27 PM.

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