Liam Dickenson and Anthony Pilkington took the score to 6 - 3 for the home side before a late Peter Whittingham consolation goal ended the scoring.
Turnbull, handed the No.1 shirt for the coming season, said of the game
"This was just one of those matches and Cardiff won't dwell too much on this.
"It's pre-season and you can't take too much notice of this. Everybody is preparing for the start of the League matches."
Stockport County: C Adamson, J Taylor, G Owen, A Williams, D Poole (T Dinning 55), A Elding (L Dickinson 28), M McNeill (A Proudlock 55), A Griffin (T Rowe 80), K Briggs (L Wilson 75), G Tansey (A Pilkington 55), P Tierney.
Subs: A Legzkins, L Wilson, G Haven, T Rowe.
Cardiff City: D Forde (M Oakes 45), K McNaughton (C Gunter 45), T Capaldi, D Purse (capt), G Loovens, G Rae, S McPhail, S MacLean, W Feeney (M Green 64), J Ledley (P Whittingham 55), T Sinclair (P Parry 45).
Subs: P Whittingham, K Cooper, J Byrne, A Ramsey, R Johnson, D Blake.
External Reports
South Wales Echo
Western Mail