[Livnletcarsliv]

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

1. Power output from 140ps to 170ps
2. Introduction of 6 Speed TC Automatic in BS6
3. Addition of Panoramic Sunroof, Powered Driver's Seat, Diamond Cut Alloys, in the top variant of BS6.
4. Some ergonomic changes like placing the USB port more accessible, etc.
5. ORVM's redesign and downsize
6. Minute cosmetic change at the boot door.
7. Reducing the rear parking sensors from 4 to 2
8. Addition of heavy sound insulation panels in the engine bay and the front fenders to reduce the NVH both internally and externally
9. 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 170ps from 140ps? 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 170ps car - I can definitely feel that it is just not an ECU/software tune.

[DicKy]

Well.
Most other same engine: 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.

.Also the 2.0 JTDM 140 HP engine, shown in Fig. 1, from the JTDM (second generation MultiJet) family, differs from the 170 HP engine because it has a max. power of 140 HP at 3750 rpm and max. torque of 320 Nm at 1500 rpm in NORMAL mode and 350 Nm at 1750 rpm with Overboost in DYNAMIC mode.

Compared with the 170 HP version, the 140 HP version makes use of:

- A dedicated engine control unit;
- A dedicated and smaller variable geometry turbine;
- A dedicated air intake chamber without swirl valves;
- A dedicated, variable displacement oil pump.

https://www.alfaowner.com/threads/2-....272653/page-2

[GTO]

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.

[Livnletcarsliv]

Originally Posted by DicKy

Well.
Most other same engine: 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.



https://www.alfaowner.com/threads/2-....272653/page-2

Well, yes I do agree with the use case mentioned here.
But as far as Tata Harrier is concerned, I don't think there is a difference in the engine generations. I mean it is the same engine. Initially, in BS4 model, Tata detuned the engine, which is not the original configuration. However, in BS6 model, it was the original configuration. The same engines are used in Compass as well as Hector.

Well, again yes there are a lot of issues, which I am facing already. So technically, there are some changes other than a just software update. Any idea how/where can I get this information?

[Risky4327]

I don't know how correct I am, but I used to think that Tata was bound to use this engine with 140 BHP tune so that Fiat could charge a premium for Compass over Harrier and it was all due to the deal between FCA and TML.
But now going through this thread, I seems there might be some technical constraint.

[WorkingGuru]

Ofcourse it's likely to be the turbocharger, the intercooler, high pressure fuel injectors and the entire exhaust system, apart from the ECU re-programming which would tune the injection timing, air intake etc.

This is apart from the structural improvements with respect to additional rebar to keep them platform stiff i.e. to reduce any flex required to counter the forces created by additional power output.

[Livnletcarsliv]

Originally Posted by WorkingGuru

Ofcourse it's likely to be the turbocharger, the intercooler, high pressure fuel injectors and the entire exhaust system, apart from the ECU re-programming which would tune the injection timing, air intake etc.

This is apart from the structural improvements with respect to additional rebar to keep them platform stiff i.e. to reduce any flex required to counter the forces created by additional power output.

My understanding is that there shouldn't be any structural improvements as this platform (OMEGA Arc) is already modified. And of course, there is no additional weight also, since it is the same engine. The same goes for the exhaust system as well

Other than that the TC, intercooler, HPFI makes sense.

[Livnletcarsliv]

Alternatively, is there any way to find out the exact differences? I am sure there should be a way out to know the changes done.

[skumare]

This might be just me, but the BS6 version looks a bit bigger and bulging compared to the older version. Is it because of the remodeled bonnet area or something else? The older model looks compact and cute :-)

[Livnletcarsliv]

Originally Posted by skumare

This might be just me, but the BS6 version looks a bit bigger and bulging compared to the older version. Is it because of the remodeled bonnet area or something else? The older model looks compact and cute :-)

There is absolutely no changes in the design and the size of the exterior between both BS4 and BS6. What you think might be due to improper alignment and improper panel gaps.