Tata Harrier BS4 vs BS6: Differences & reason for more power

How did Tata Motors manage to increase the power output of the SUV? Was it just an ECU tune or is there something more to it?

BHPian Livnletcarsliv recently shared this with other enthusiasts.

We all know the following differences between BS4 Harrier and BS6 Harrier.

• Power output from 140 PS to 170 PS.
• Introduction of 6-Speed TC Automatic in BS6.
• Addition of Panoramic Sunroof, Powered Driver’s Seat, Diamond Cut Alloys, in the top variant of BS6.
• Some ergonomic changes like placing the USB port more accessible, etc.
• ORVM’s redesign and downsize.
• Minute cosmetic change at the boot door.
• Reducing the rear parking sensors from 4 to 2.
• Addition of heavy sound insulation panels in the engine bay and the front fenders to reduce the NVH both internally and externally.
• Redesigning the manual gear cable to make it shorter, etc.

Please add if there is anything that I missed.

Well, as a BS4 Harrier owner I can understand all but 1st point and I am intrigued by the same.

Can anyone shed some light on how did Tata make it to 170 PS from 140 PS? Was it just an ECU tune or is there something more to it? Are there any hardware changes as well – like a bigger turbo, bigger intake, or anything else?

I did drive the 170 PS car – I can definitely feel that it is just not an ECU/software tune.

Here’s what GTO had to say about the matter:

There’s more to it than meets the eye (or on-paper specs). The BS6 Harrier was rolled out 1.xx years after the premature BS4 version. It was far improved in many ways. While the obvious issues were corrected, there were a LOT more changes under the hood.

I insist, with fresh Tata launches, it’s best to wait a year or two and give the company time to sort out teething issues. Ditto with Mahindras, especially the likes of the XUV700.

Here’s what BHPian DicKy had to say about the matter:

Well, most other same engines: different tuning ones would have different gearboxes or turbo types. Not sure if there is anything other than ECU difference here, but did find this on the internet.

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