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Is it possible to produce a chart of what cams can replace what other cams; with possibly any small changes that could result?
Are there clues in the tune charts? String and cable lengths for example, might give clues, but I am just guessing there.
It seems some on here are able to give clear answers to such questions. It also seems to be a task that is quite frequently asked about.
In general GTX cams are faster tha n the cam 1/2 plus. This is a price that we are willing to pay in order to have a smoother draw. As far as cables and the string we will change it as the target is to increase significantly the draw length. ( from 27" to 31")
This is a genuine question.
If you know there will be a change in poundage and speed, how did you find that out?
I mean, it could be a simple deduction from knowing one cam is more aggressive. Or others who have done the same may have passed on speed change information etc.
My guess is that it should be possible to calculate some figures from some data, but I am only guessing and would rather be told by someone who already knows how it is calculated.
I totally agree with you that there should be a comparison chart between the various gams supplied by the various bow makers. For me it works with a simple deduction and lots of guessing (and I hope luck). A Vantage Elite Plus bow produces 309fts with the GTX cams at 60lbs (at a draw length of 30 inches) and 305fts with the Cam 1/2 plus cams. Any decrease in the draw length will produce lower poundage and less speed and any increase will have the adverse result. I therefore presume (the guessing part comes in) that since we need to increase the draw length to 32 inches any loss of poundage will be significantly resumed back due to the increase in draw length.
The adove assumption is based on the fact that we had the case where a shooter shooting a vantage elite plus with cam 1/2 plus at 30 inches draw length, when we measured the bows poundage it came out to be 62lbs and we had to reduce it in order for him to be able to shoot at the recent Uropean Championship.
If you come across of any chart please let us know as it is essential to know how to compare cams and draw lenths.
Hi Matrix1 again,
I see what you mean now thanks. I can see how that works.
One of the dangers when changing cams is doing so without knowing that the two speeds were produced on identical bows with identical limbs. For example, on some bows a change in draw length will require a different cam size.To keep the same draw weight as on the original cams,a different weight limb may be required required, too.
The problem gets bigger when changing cams from different makers.The draw length may be the same, but how the draw weight is generated may depend on a different "gear ratio" with the new cams. That will require different weight limbs, to keep pace with the gearing.
No. the modules are rotated - not changed - to change draw length. If you want to change outside the parameters of a particular base cam (1.5" for gtx or 2.5" for cam 1/2+) then you have to change base cams.