Doomtheflame said:
Northwest ale's temp range is 65-75 i was at 68 ambient how much higher does the fermenting go up
And i did think of room temp being to high probably too late but has for my question dry hopping the beer will it help attanuate or remove banana off flavor or will it worsen it with a amarabanana flavor
Just because the packaging says that the temp range of the yeast is 65-75, doesn't mean that you should ferment anywhere within that range. If you want banana, you can ferment higher, if you don't want it, you should ferment lower.
As far as how much higher it will go, that depends. I've had some that only go up 1-2F, but that is a rarity. Most of mine go up at least 4F and 6F seems to be the norm. I think that you were probably fermenting at about 74F.
To cool it down, you can lower the ambient temperature. You could also put the fermenter into a tub of cold water (maybe 4" of water), dampen a towel or t-shirt and wrap it around your fermenter with the cloth hanging down into the water. Put a fan on it. The cloth will wick water up and stay wet. The moving air will take heat out, as the water evaporates out of the cloth. You can usually drop 4-6F this way. If you want to drop it further, you could put some frozen 2 liter bottles of water in the water bath. This will keep the water colder. You have to keep rotating them out and refreezing them, but this might drop you down about 8F.
I'd want to ferment that beer at about 65F. Once your gravity drops about 75% of the way down towards your FG, you can take the fermenter out of the water bath system and let it free rise up to about 72F. This is a diacetyl rest and will allow the yeast to clean up after themselves, giving you a much cleaner, less fruity taste profile. I leave my beer at that 72F stage for 2-3 days and then drop it back down to the low 60's to let the yeast flocculate out. Once the beer is to the point where you have steady gravity readings for 3 consecutive days and it's nice and clear, then you can bottle it.
As far as the banana flavor is concerned, it's probably there to stay. However, the dry hopping that you're planning may cover it up some. The good news is that banana flavor is not the end of the world. It's still beer! You may actually like the banana flavor.
Let us know how it is, after it's been in the bottles about a month or so.