View Full Version : Tuning Alien Z
10-29-2012, 10:18 PM
Just bought a 2011 Alien Z and have been trying to tune it to get good arrow flight. I am pretty new to this so you will have to excuse my inexperience. Set the centershot by lining up the bowstring with the rest and shot through paper at 6 feet. Nock tear left adjust the rest almost to the riser -- very strange looking setup. I still get a nock tear left but it is small less than 1", but I want a bullet hole like my Onza. I thought for a minute that maybe I had a spine issue until I turn the bolts out 3 turns and still tore left with a 340 spine and 100 grains. Put on a 400 spine with a 125 grain tip and still tore left. I thought what the heck and moved out to about 8-10 feet with bareshaft 30 inch 340 spines at 60 lb draw weight and shot arrows and moved rest until the arrow went straight into the target. This thing is shooting really good bareshafts out to 10 feet but man it looks strange. I went to my local dealer that doesn't really sell any Martin bows just has a sticker on the window and he looked at me like I was nuts. He asked me if I had the rest laser aligned, and almost died laughing. I think that I am around 3/4" off of the riser with the center of the rest and at full draw I see some cam lean probably from the cable roller STS? I checked the tiller, however I am not sure how that would affect this? The timing of the cams looks good. I would like to try to adjust the cam lean at full draw, how do I do that? I imagine that I need a press to twist cables? I realize that I shouldn't get so hung up on this since I will probably be able to get good arrow flight, but this doesn't look anything like the Onza and I can't help to think that I have an issue?
10-30-2012, 08:37 AM
Try setting the centershot at 7/8" or just a hair more and shortening the draw length one hole (1/2")
Remember to reset the drawstop.
10-30-2012, 09:18 AM
First off, welcome to the forum, glad you're here! :)
Secondly, I can understand you wanting to get the most out of your bow. Personally though, I use the paper tune as a starting point; I want to get the nock set (up/down tear) completely set, and then I work on the center point. Usually I'm not nearly as anal with this part of the paper tune, I just want to get my left/right close, and then I do a walk back tune to get my center shot set.
As for the lean of the cams at full draw, I wouldn't worry too much about it, its their orientation at release that's important; thats where the bow imparts it's last bit of influence on the arrow as it leaves.
Besides, the Z has the Hybrix cams, which are binary dual cams and have no yoke system, so there's not really any adjustments you can make with the cables to effect lean...
But just for you info, Martin bows (Rytera as well) can be taken down and have adjustments made without a press by turning the limb bolts out equal turns until there is enough slack to slip the strings off their tracks. :)
Good luck and great shooting!
10-30-2012, 10:15 AM
what arrow rest are you using
10-30-2012, 10:46 AM
I am using a QAD Pro LD. I thought that the cable guard rollers were pulling the cables away from the centerline a little more than necessary so will try to adjust them inside some with shim or machining the bracket. I also ordered a bracket to convert the roller guide to cable slide like most of the target bows just to play around a little. I can't help thinking that the nock has to be moving off of plane to throw that bare shaft around so much?
10-30-2012, 09:18 PM
I have used this method and it works really good: http://martinarchery.com/mtechforum/showthread.php?18275-10-Yard-Tuning-Method-%28For-Sight-and-Rest-Alignment%29
11-07-2012, 01:54 AM
Thanks for all of your suggestions. I finally have the bow shooting great. Converted the roller cable guide with the slide rod kit from Martin and put on a Tilt Tamer. Lined up the bow string with the rest and the site and only had to move the rest in a little bit to get straight flight with a bareshaft. Center shot is currently set at 1-3/16" and the sight is nicely inline. Still need to paper tune it and walk back tune it as was suggested here. This honestly feels like a completely different bow. You don't feel nearly as much torque in this bow and it seems to hold much better on target. I was a little worried about the cables blocking the sight picture but it is barely on the edge of my sight picture and it shouldn't bother me at all. The only thing that was tricky was having to swap the cables around without a press, and it required a slightly different string stop to clear cables.
11-08-2012, 09:52 AM
pics! pics! pics! :)
We like bow porn ;)
11-09-2012, 05:10 AM
Hade a chance to shoot it today and everything is shooting great. Bullet hole through paper 6-10 ft away. Could only shoot out to about 30 yds but it shot great. Here are a couple of pictures.
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