There was very little to choose between the two teams but Terry Bywater was the difference in the first quarter, his 12 points edging Britain to a 16-14 lead.
Turkey fought back in the second period, going 22-19 ahead but despite a flurry of British baskets the lead at the half was still two points, with GB 32-30 up.
Great Britain finally managed to build up a lead at the end of the third quarter, Bywater netting a three-pointer for his 17th of the afternoon as GB were up 54-45 with one to play.
Turkey fought back late in the period by netting a string of baskets to take the scores to 71-70 to GB with just 20 seconds left.
However, Bywater drew a couple of vital fouls late on and netted his free throws to edge Britain through 75-70 in a thriller.