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Old 12-28-2012, 05:26 AM   #1
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Default IBUs seem way off

I am looking at brewing a Duvel clone, and think that I will use Jamil's Belgian Golden Strong ale recipe. I see tons of great reviews for it, so yay me.

However, the printed recipe looks wrong to me. Jamil calls for 2.25 ounces of Czech Saaz hops. 3.5% AA, 90 minutes, 32 IBUs.

Only, if I punch 2.25 ounces of hops these into Beersmith, I only get 12.8 IBUs, which is way low for this style.

I see the recipe again and again online, and while some people bump the hops up a bit, it's not much. So what gives? How am I supposed to get 32 IBUs from this? Wgat stupid thing am I missing?

Thanks!

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Old 12-28-2012, 05:32 AM   #2
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From what I see in this http://www.brewersfriend.com/ibu-calculator/ It seems right to me. Saaz isn't all that bitter. I'd go with Jamil's recipe.

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Old 12-28-2012, 05:33 AM   #3
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Extract or all grain? Full boil or partial? If the OG is higher, then the IBUs will be lower. Also make sure you adjusted the hop addition to be the same AA% (as the ones you have) and the time to 90 minutes. Most of the time hop additions default to 60 minutes in BeerSmith. Are you using BeerSmith 2.1.x?

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Old 12-28-2012, 05:34 AM   #4
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Quote:
Originally Posted by CBMbrewer View Post
From what I see in this http://www.brewersfriend.com/ibu-calculator/ It seems right to me. Saaz isn't all that bitter. I'd go with Jamil's recipe.
Huh. Thanks for the link.

So that makes me wonder... why is Beersmith so badly off?
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Old 12-28-2012, 05:37 AM   #5
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Originally Posted by Golddiggie View Post
Extract or all grain? Full boil or partial? If the OG is higher, then the IBUs will be lower. Also make sure you adjusted the hop addition to be the same AA% (as the ones you have) and the time to 90 minutes. Most of the time hop additions default to 60 minutes in BeerSmith. Are you using BeerSmith 2.1.x?
All grain. Full boil. I did adjust the numbers on the hops - Beersmith actually had Saaz defaulted to 4.0% AA, whereas Jamal was assuming 3.5%. So, if anything, the IBUs should have been higher, right?

I did adjust them to 90 minute addition per the recipe, though that naturally gives almost no boost over 60 minutes.

Yep, Beersmith 2.1.02, freshly downloaded today.
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Old 12-28-2012, 05:37 AM   #6
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Quote:
Originally Posted by homebrewdad View Post
All grain. Full boil. I did adjust the nmbers on the hops - Beersmith actually had Saaz defaulted to 4.0% AA, whereas Jamal was assuming 3.5%. So, if anything, the IBUs should have been higher, right?

I did adjust them to 90 minte addition per the recipe, though that naturally gives almost no boost over 60 minutes.

Yep, Beersmith 2.1.02, freshly downloaded today.
You sure you have the IBU formula set the same? Post the recipe and I'll try it in my setup.
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Old 12-28-2012, 05:44 AM   #7
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You sure you have the IBU formula set the same? Post the recipe and I'll try it in my setup.
I'm not at all sure, hence my questioning.

Recipe is simple.

11 lbs pils malt.
3 lbs cane sugar.
2.25 ounces Czech Saaz hops (3.5% AA), 90 minutes, 32 IBU.
WLP570 yeast.

Recipe assumes a 6 gallon batch.
OG 1.072
FG 1.007
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Old 12-28-2012, 06:00 AM   #8
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Quote:
Originally Posted by homebrewdad View Post
I'm not at all sure, hence my questioning.

Recipe is simple.

11 lbs pils malt.
3 lbs cane sugar.
2.25 ounces Czech Saaz hops (3.5% AA), 90 minutes, 32 IBU.
WLP570 yeast.

Recipe assumes a 6 gallon batch.
OG 1.072
FG 1.007
Looks like Rager formula could have been used... That gives me 29 IBU with that list. I get 23 IBU with Tinseth. Sure you're not missing a hop addition? If you really want the 32 IBU then figure out how much more hops to add to get there.
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Old 12-28-2012, 06:18 AM   #9
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it has to do with the equipment settings I would bet. plugged that recipe in under default equipment and it gave 20 ibus, swapped to the equipment profile I use and it went to 29

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Old 12-28-2012, 06:45 AM   #10
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My guess was the ibu calculation formula was different, Rager vs Tinseth or some such. My other guesses would be batch size (gallons) or a long shot being the mash efficiency is set at 99 or something accounting for a higher OG and lower hop utilization.

??? That's all I got.

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