Gentlemen I desperately need your help here as I am now baffled - read on!
I have a 2011 reg C63 Coupe which has only covered 25k miles, right from the start the car has never felt stable at very high speed (*removed*), but I put this down to the rear tyres, as they were worn and getting ready to be replaced, based on this I gave the high speed runs a miss.
In February I fitted 2 brand new Goodyear Eagle Assymetric 2 to the rears, and decided to go wider fitting 265 x 30 x R19.
Thinking this should have cured the problem I went out for my usual favourite blast which ends with a motorway drive, as soon as I accelerated hard at around *removed*, the car feels as though it is on ice, the back end goes very light, and I am having to correct the steering no end, not a nice feeling at all and bloody baffling. High speed runs are again deleted.
At the end of Feb I go to MSL and have an ECU remap and IPE exhaust fitted, now producing 525BHP - well pleased!
I now take the car along to JCT Porsche at Sheffield as I trust their mechanics and we check the car out for full 4 wheel alignment, after an hour the report comes back all clear, everything is either **** on or well within allowed tolerance, mmmmm??, car still feels unstable on the motorway at *removed* or very, very hard acceleration.
Fast forward to tonight, and to be honest me and the wife are lucky to be alive. Coming back home from Sheffield I rose to the bait with a Golf R.
Still in comfort mode I hit the pedal and go for it, at around 140+ we come to a slight motorway curve / bend, at this point the car starts to loose control, and I am having to seriously correct the wheel, the back end is moving from side to side as is the front, the same feeling as " aquaplanning", at one point I have moved from the 3rd lane back into the middle lane!!!!.
I slowly ease off and at around , well god knows what speed, the car is back in control, lets say *removed*
Putting everything aside,( I know the high speed is foolish, especially at my age!) the standard car should be rock solid at up to *removed* - agree?
Anybody any idea.
I have 38 psi all round in the tyres?, they seem to have been fitted correctly, I have Michelins PSS on the fronts by the way at the standard Merc size.
Looks like a trip to Wakefield MB I think?
I have a 2011 reg C63 Coupe which has only covered 25k miles, right from the start the car has never felt stable at very high speed (*removed*), but I put this down to the rear tyres, as they were worn and getting ready to be replaced, based on this I gave the high speed runs a miss.
In February I fitted 2 brand new Goodyear Eagle Assymetric 2 to the rears, and decided to go wider fitting 265 x 30 x R19.
Thinking this should have cured the problem I went out for my usual favourite blast which ends with a motorway drive, as soon as I accelerated hard at around *removed*, the car feels as though it is on ice, the back end goes very light, and I am having to correct the steering no end, not a nice feeling at all and bloody baffling. High speed runs are again deleted.
At the end of Feb I go to MSL and have an ECU remap and IPE exhaust fitted, now producing 525BHP - well pleased!
I now take the car along to JCT Porsche at Sheffield as I trust their mechanics and we check the car out for full 4 wheel alignment, after an hour the report comes back all clear, everything is either **** on or well within allowed tolerance, mmmmm??, car still feels unstable on the motorway at *removed* or very, very hard acceleration.
Fast forward to tonight, and to be honest me and the wife are lucky to be alive. Coming back home from Sheffield I rose to the bait with a Golf R.
Still in comfort mode I hit the pedal and go for it, at around 140+ we come to a slight motorway curve / bend, at this point the car starts to loose control, and I am having to seriously correct the wheel, the back end is moving from side to side as is the front, the same feeling as " aquaplanning", at one point I have moved from the 3rd lane back into the middle lane!!!!.
I slowly ease off and at around , well god knows what speed, the car is back in control, lets say *removed*
Putting everything aside,( I know the high speed is foolish, especially at my age!) the standard car should be rock solid at up to *removed* - agree?
Anybody any idea.
I have 38 psi all round in the tyres?, they seem to have been fitted correctly, I have Michelins PSS on the fronts by the way at the standard Merc size.
Looks like a trip to Wakefield MB I think?
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