Oh Dear.... KV5.... but now KV6 again

[JohnDotCom]

Right I have just had confirmation from my Brothers Database at his Garage (thanks Bruv) that the ZS V6 2.5 180BHP does have much lower emissions 227g/km than that of the same lump in the ZT.
This is mainly due to the Auto Gearbox and other ECU differences.
Hope that helps you Dave.

[stocktake]

Originally Posted by James.uk

Hi Dave. In order to minimise the ECU issue and other problems, I think you have to replace your engine with as near an exact match a possible. :lol:

I would certainly be looking for an engine that was prev coupled with an auto box..

E.G. The 1.9D Cit ZX Turbo engine would ruin the 1.9D ZX auto gearbox within days! the turbo produces too much torque for it.
.

Now you have me confused? If the engine produces the same BHP, has the same inlet, outlet valves, stroke length etc, then if connected to my ECU should behave exactly the same? Why or how would it differentiate with the auto?

I can see how the addition of a turbo would cause the gearbox to go into shock but in this case I am thinking all the mechanics are the same, all the electronics are the same?

[JohnDotCom]

Great News Dave have a look:
ECU Details Below for the ZS V6 180BHP first:

NNN000170 Electronic control unit engine - programmable to vehicle via testbook £375.00 + VAT

ECU Details for V6 2.5 180bhp in a ZT.

NNN000170 Electronic control unit engine - programmable to vehicle via testbook OR once configured to a vehicle, this cannot subsequently be reconfigured £375.00 + VAT

Same ECU Control Box for Manual or Automatic Gearbox.

[JohnDotCom]

Added note above re gearboxes.

[stocktake]

Thanks John

[madmax1975]

dont know if may help but could be worth looking at i fixed my sisters car on friday she was driving home from work and it went onto 3 cyl she got it home so i went and had a look checked all plugs like you do and leads etc i found it to be a faulty earth wire i stripped it back cleand it up refitted and hey presto fired up on all 4 bit strange but it been fine since

[madmax1975]

ignor last post for sum reason my pc skipped a page didnt read all sorry

[Jules]

Originally Posted by JohnDotCom

The reason I gave the Info to Dave re 160 engine was purely down to the Emissions via DVLA site.
Your one is shown at DVLA as 227g/km
See Below:

Date of First Registration 21 09 2001
Year of Manufacture 2001
Cylinder Capacity (cc) 2497CC
CO2 Emissions 227g/Km
Fuel Type Petrol

ZT Range:
The 1.8 120 had 184g/km
The 1.8T 160 had 194g/km
The 2.5 V6 160 had 225g/km
The 2.5 V6 Sports Auto 180 had 259g/km
The 2.5 V6 190 had 239g/km


The car registration doesn't come up with any details on EPC, which it should.
So very strange.
Unless the different model (not being in a R75) alters the emissions somehow?

But on Review of ZS it sstates:

A point to note about emissions boys:
Correct me if I'm wrong, but the g/km will differ from an identical engine run in 2 different body shells.

It stands to reason the ZS has the lower of the 2 emissions.
The engine doesn't have to work as hard to get to a given speed in the lighter body shell.
Put another way the lighter bodyshell (ZS) will need a lighter throttle opening to get to a given speed hence less fuel & lower g/km than the heavier ZT

Also the aero dynamics come into it .

Think what the emissions would be with the brakes on at say 50 MPH with a full throttle setting

[StevenWilliams]

Originally Posted by Jules

.

It stands to reason the ZS has the lower of the 2 emissions.
The engine doesn't have to work as hard to get to a given speed in the lighter body shell.
Put another way the lighter bodyshell (ZS) will need a lighter throttle opening to get to a given speed hence less fuel & lower g/km than the heavier ZT

This is correct however you wouldn't see a difference if they are tested at standstill as in an MOT as neither car is moving.

[Jules]

Agreed Steven & the MOT emission test is only interested in CO % Volume
So the g/km figure is a different criteria measured over a travelled distance.

Maybe Dave could incorrectly convince the DVLA to charge him less Road Tax due to the lower emission ZS engine he's going to fit!