mg zt 160 versus 190

[tvralfagtv6]

Does any one know what the exact engine differences there is between 160bhp zt 2.5 v6 and the 190bhp 2.5v6
i thought it was may be just an ecu chip but superchips only shows 10 bhp improvement using their chip over the standard 160.now the rover 75 2.5 has 180 ....daaa! please help.. how do I get my 160 more fruity?

[flooritforever]

I work in an MG Rover dealership, and even nobody here knows the answer to that one! Your best bet for more ummph out of your 160? Trade it in for the new ZT 160 1.8 Turbo version, which is quicker to begin with. Being a turbo car it shouldn't be hard to get much more power out of it. In fact, getting that upto 190 shouldn't be too hard!

[Esprit]

I'd imagine it's in the camshafts most likely. Compression ratio is the same so you can assume the whole bottom end is identical, there's no point having two separate production lines to make essentially two versions of the same engine. For the ssame reason I'd suggest the head is identical as well and the valves are probably the same size (although may be modified, such as waisted in the 190. The induction system also is probably pretty standard as I'd imagine that MG aren't wanting to RESTRICT the car, so much as get it into a certain tax/insurance/emissions bracket.
My guess is it's re-cammed and also chipped to take advantage of this.
Basically, this gives you lower ultimate power but probably greater flexibility as your inlet and exhaust gas velocities are raised at lower RPM making the engine less peaky but providing greater flexibility. That'd be my guess anyway

>> Edited by Esprit on Tuesday 13th January 10:31

[jcbzt160+]

Differences are:
Smaller induction inlet, 4Degress of Enhaust cam advance and "Maybe" a different ECU map.
But if you fit an aftermarket induction kit with a cold air feed you get a lot of ground back.
Drop over to www.mg-rover.org if you have more specific Q's...

[tvralfagtv6]

Many thanks for the replies, now is the inlet valve, port, or manifold smaller.

and is the -4 degrees duration of the cam lobe or the timing between the inlet and exhaust cam.

Personally if I was rover I would have left everything
standard and just restricted the inlet throttle body using blanking plates, but that may not give any better economy. g/km

I 'm thinking of having the motobuild piper cam conversion, I just want to know the engine is giving its best compromise and not tax efficient engineering.