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Old 24-12-2008, 16:38   #1
immy
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MG ZT 1.8T performance/reliability

I have just bought a MG ZT 1.8T 2004 (new shape) in trophy yellow.I wanted to know if it can be chipped/remapped and what power gains i can get.Also wanted to know if remapping will affect reliability,especially head gasket.Has anyone had any head gasket problems with this car? Also,at what mileage does the timing belt need to be changed? Thanks
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Old 24-12-2008, 16:42   #2
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Originally Posted by immy View Post
I have just bought a MG ZT 1.8T 2004 (new shape) in trophy yellow.I wanted to know if it can be chipped/remapped and what power gains i can get.Also wanted to know if remapping will affect reliability,especially head gasket.Has anyone had any head gasket problems with this car? Also,at what mileage does the timing belt need to be changed? Thanks
Head gasket failure is unfortunately quite common on the 1.8 engine, even without any any remaps... put it into the search herre and you'll find quite a lot of info about it.
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Old 24-12-2008, 16:56   #3
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Although there are a number of reports of HGF on the 1.8 I wonder how many 1.8's out there have never had a problem? No one posts that they are having no problems with their engine after all.
I have a 1.8 non turbo with just over 40k on the clock and not had any problems with it apart from the cat failing (touch wood). Having said that I would expect the turbo to be more prone to failure and remapping it would make it even more likely. I would suggest if you are going that route to go for the upgrated head gasket as a matter of course
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Old 24-12-2008, 17:03   #4
immy
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Although there are a number of reports of HGF on the 1.8 I wonder how many 1.8's out there have never had a problem? No one posts that they are having no problems with their engine after all.
I have a 1.8 non turbo with just over 40k on the clock and not had any problems with it apart from the cat failing (touch wood). Having said that I would expect the turbo to be more prone to failure and remapping it would make it even more likely. I would suggest if you are going that route to go for the upgrated head gasket as a matter of course
Thanks for info,think i`ll leave it standard.(jamesc)- have you had your timing belt done yet? If not,when is it due?
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Old 24-12-2008, 17:06   #5
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Old 24-12-2008, 17:08   #6
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Thanks for info,think i`ll leave it standard.(jamesc)- have you had your timing belt done yet? If not,when is it due?
I know it's every 6 years, not sure on what the milage is though, I'm sure someone will be along very shortly who is far more knowledgable than me about these things to fill you in.
Forgot to say i've not had mine done yet, it's due in the next 12 months or so
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Old 24-12-2008, 17:09   #7
immy
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90,000 miles or 6 years, whichever occurs first.
Thanks.Mines only done 63k so no worries for a while.I got 3 months warranty with it aswell so abit of peace and mind (for 3 months anyway).
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Old 24-12-2008, 18:06   #8
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Originally Posted by jamesc View Post
Although there are a number of reports of HGF on the 1.8 I wonder how many 1.8's out there have never had a problem? No one posts that they are having no problems with their engine after all.
I have a 1.8 non turbo with just over 40k on the clock and not had any problems with it apart from the cat failing (touch wood). Having said that I would expect the turbo to be more prone to failure and remapping it would make it even more likely. I would suggest if you are going that route to go for the upgrated head gasket as a matter of course
My parent's is now on 45k and *touch wood* no signs of HGF. Survived a trip round the South of France in hot temperatures.

It's a 2005 model so 'should' have the new Land Rover gasket fitted.

Excellent choice of car by the way!
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Old 24-12-2008, 18:36   #9
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People talk about hgf as if it's inevitable. The primary cause of hgf is overheating due to coolant loss. Loss of coolant is often overlooked/missed because of the poor design of the temperature gauge. This shows 'normal' (the 1/2 way mark) for any temperature between 75 and 115 degrees Centigrade. A minor leak can send this way above 'normal' very quickly and before many people realise the gauge is hitting the red, it's too late. Consider the gauge a worry indicator. Anything higher or lower than 'normal', worry. - and more importantly, act.
As in most things mechanical, prevention is better than cure. The coolant content of the K18 must be one of the smallest known to man (about 6.5 ltres) so even a minor leak has to be taken very seriously. The best advice is to be aware of the weak spots in the cooling system and check the level regularly. Run the diagnostic screen in temperature mode every so often so you can see how things really are going temperature-wise. With due care and attention, the K18 will have a worry-free life.

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Old 24-12-2008, 20:15   #10
immy
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Does anybody know if the same engine (1.8t) is in both old and new shape MG ZT or has the engine in the new shape had revisions?
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Old 25-12-2008, 05:28   #11
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Does anybody know if the same engine (1.8t) is in both old and new shape MG ZT or has the engine in the new shape had revisions?
It's the same engine that Rover used for years, pretty much.
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Old 25-12-2008, 11:25   #12
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I believe the thermostat was revised on later engines. The conventional wax type stat was replaced with a Pressure Refief Thermostat (PRT) mounted under the radiator. The old housing contains a dummy.

TC
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Old 26-12-2008, 09:03   #13
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Quote:
Originally Posted by T-Cut View Post
People talk about hgf as if it's inevitable. The primary cause of hgf is overheating due to coolant loss. Loss of coolant is often overlooked/missed because of the poor design of the temperature gauge. This shows 'normal' (the 1/2 way mark) for any temperature between 75 and 115 degrees Centigrade. A minor leak can send this way above 'normal' very quickly and before many people realise the gauge is hitting the red, it's too late. Consider the gauge a worry indicator. Anything higher or lower than 'normal', worry. - and more importantly, act.
As in most things mechanical, prevention is better than cure. The coolant content of the K18 must be one of the smallest known to man (about 6.5 ltres) so even a minor leak has to be taken very seriously. The best advice is to be aware of the weak spots in the cooling system and check the level regularly. Run the diagnostic screen in temperature mode every so often so you can see how things really are going temperature-wise. With due care and attention, the K18 will have a worry-free life.

TC
Totally agree with you TC. The voice of reason.
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Old 26-12-2008, 10:53   #14
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Totally agree with you TC. The voice of reason.

Agreed, not all 1.8s will meet their maker prematurely.

My Dad's first 75 was a 1.8 facelift, he knew about the K4 weakness, he used to keep a close eye on the expansion tank, but when he first got it could not work out where the level should be, so the Technician at the dealership drew a market pen line on the tank with indelible marker so he could see it clearly. I think that this poor marking also confuses people as to where the level should be.

He now has a CDTi Tourer so has no such issues, but TBH I would leave a 160 turbo 1.8 as it is to avoid troubles. The 160 is pretty spritely for a 4 cyl 1.8 engine in a big car, so look after it and prevent the HG trouble & you can enjoy the power it produces nicely.

Regards, Rob.
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Old 26-12-2008, 17:11   #15
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It's a 2005 model so 'should' have the new Land Rover gasket fitted.
Only about 1000 engines had the MLS gasket fitted to them, not all 1.8s either so wether or not yours has an MLS is debatable !!
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