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hi guys im having a poblem with my S2 attessa 4wd system ,

i have just fitted 2 second hand tyres one on the front pass and

the other on the drivers rear . both tyres have 50% tread and

all 4 tyres are the same size 245/35/19 . now when i drive the car

the 4wd system is coming on under normal driving conditions

front torque gauge reads anywere between 5 kg/m - 10 kg/m

and the car feels as if it is surging . im thinking that maybe because

the tyres are actualy slightly a diffrent rolling dia so therefore the

attessa system sensors are telling it that one of the wheels are spinning

enough to engage the 4wd . im just wondering if anyone has come across

this problem before ??????, there was nothing wrong at all with the car

before the 2 tyres were fitted , and no one touched the car at all while the

tyres were fitted and the guys who fitted didnt break or damage anything

because i watched him like a hawk like i do with anyone who works on my stag

HAHAHA :D;):wacko::D any help will be very much apprciated thanks guys and girls ....

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Dude the diff rolling diameter is defs the prob. As a side not I noticed that the 4wd was kicking in more ofter with just lower tyre pressure (I know of others that this has happened to).

Also as kidafa said dont mix n match tyres from side to side on each axle. Not just for safety reasons but u can damage diffs etc by putting diff size tyres on the one axle.

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And risk damage to the 4wd system? Good advice!

plesae tell me how it is going to damage it ? the rear wheels wont be turning faster than the front so it wont send any drive to the front . and the overall difference wont be any greater than the difference between wheel speeds when driving around a corner. i put the space saver on the rear of mine and it was a flamin mongrel . sent like ten% to the front . unplugged the green wire and it was happy as

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thanks guys fo your help in conferming what i thought was the problem. i have changed the tyre that was the problem and it has fixed it . but i have booked the car in for 4 new tyres next week so my problem is now ALL GOOD thanks again eveyone who helped out !!!!

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