Weird knocking noise when I turn...

i have a 94 integra ls... when i make a sharp turn i hear this loud knocking sound coming from the front of my car... only thing is... it's only when i hit the gas... i can be going down the road... let off the gas... and turn... and no sound... but once i press the gas at all the knocking sound starts knocking... anyone ever had this problem or know what it is? it's not my 17's... cuz now that i hvae the stock rims back on it does it again