speed difference between 70 and 80lb

[crsavage2002]

i am thinking of buying a new answer bow but was wondering the speed difference between the 70 and 80lb bow. if it would be worth getting the 80lb or just sticking with the 70. help would be great. thanks

[cmillett79]

Just depends on what your comfy with . Most 300 spines arrows will be over 400grns ( recommended for 80lb DW ) once they are fletched and suited out . Im a pretty stout man and I rdered an 08.5 80lb z28 yrs ago , loved it but my arrow selection sucked . With that I couldnt shoot those arrpws with any of my other bows or voce versa . So I ended up putting 70lb limbs on it and lost 17fps in the same weight arrow if I remeber right . Im happier with the 70lb limbs since its more economical on my pocket and arrow selection .

[crsavage2002]

yeah i plan on shooting the easton fmj 300 arrows with 125gr tip. i talked to elite and they said i would only gain 5fps with the 80lb bow, that didnt sound right to me. if i was only gonna gain 5fps i might as well go with the 70lb.

[akrubi]

I believe it's 5fps with a 50 grain heavier arrow to boot

[cmillett79]

yeah i plan on shooting the easton fmj 300 arrows with 125gr tip. i talked to elite and they said i would only gain 5fps with the 80lb bow, that didnt sound right to me. if i was only gonna gain 5fps i might as well go with the 70lb.

You will gain 5fps " IBO " not 5fps in the same grain arrow , just so you know what they meant in case you didnt .

Lets use "340fps" IBO for example
IBO = 30" DL @ 70lbs

a 60lb DW @ 30" DL would = about 335-336 IBO
a 70lb DW @ 30" DL = "340" IBO
a 80lb DW @ 30" DL = 345 IBO or close to it

Whe you talked to Elite Im sure they wheer refering to IBO gainnot how mush faster a 10lb neavier DW would push teh same grain arrow vs a 70lb DW bow in same specs .. You would prbly gain about 15-20fps depending on the bow model using the same grain arrow using a 80lb over a 70lber

Give me your DL and arrows weights you would use I I will gove you a 70lb vs 80lb calculation in speed . The calculation will be near real world results .

[crsavage2002]

dl is 28. my arrows are about 29". i believe that total arrow weight is about 500g. 300 easton fmj with 125 broadhead. i did the calculations on backcountry bowhunter and it gave me about a 20fps difference. not sure if your using same website. also you wouldnt happen to know letoff difference between smooth mods and speed mods would you. thanks

[cmillett79]

I have no idea what the letoff would be between the two mods and yep 20fps sounds realistic .

[ntypicl11]

I used to have an 80lb Synergy. Gained a little in the speed department, like what was said, new arrows, for me anyways. The hard part was finding a target capable of stopping the arrows. New block at 60 yards, went right thru. A good bag will stop it, but really hard on them. My 70 lb Pulse is only a few fps behind what my syn was at 82, same arrow. I'll take the 70lb draw anyday!