Is it normal for the Vento AT to roll back on slopes before moving forward?
Published On Oct 08, 2015 02:47:00 PM
50,983 ViewsFollow us on
I recently bought a new petrol VW Vento AT. When stopped on a slope, the car has a tendency to move back before moving forward, without accelerating. The dealer claims this is not a problem, but I’d like your expert advice on this.
Anas Aman, via email
AAA Mechanically, a dual clutch or DSG gearbox is more of a manual ’box rather than a proper automatic, so some characteristics (like rollback) are akin to manuals. Traditional automatic gearboxes have a high stall speed (which means the engine can hold high rpms without actually moving forward), achieved by a torque converter. But since there is no torque convertor in a DSG, this is achieved through other means – ie, electronic control of the clutches.
A pitch sensor on the car determines whether the car is on a slope and sends a signal to ECU to engage hill-hold. Being a full-blooded manual transmission on the inside, the ECU needs some time to find the friction point (bite point) of the electronically controlled clutch (like a driver would normally need in a proper manual transmission car). So a rollback on a hill is quite normal before the clutch engages. This is one of the weaknesses of a twin-clutch auto gearbox and, unfortunately, the Vento doesn’t have an effective hill-hold mechanism to prevent it from rolling back. However, you can be rest assured that this issue is completely normal and there is nothing to worry about.
Copyright (c) Autocar India. All rights reserved.
Which compact city EV would you buy on a Rs 12 lakh budget?
No comments yet. Be the first to comment.