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10th July 2021, 20:31 | #1 |
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Morris ZT-T 190+ Join Date: Jun 2021
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Why is the ZT 190 so slow on paper?
Hello forum,
My first thread here. Just got a ZT-T 190, lovely car! Just wonder how it spec-wise could be so slow. My previous car, an E39 BMW 525i Touring, is 160kg heavier, has no more power, and is certainly quicker according to (saloon) specs From Zeperfs: ZT 190/525i E39: Motor: 2.5 V6 24V | 2.5 I6 24V Power: 190hp @ 6500 | 192hp @ 6000 Torque: 245Nm @ 4000 | 245Nm @ 3500 0-100 claimed: 8.2s | 8.1s (Touring 8.5s) 0-100 verified: 8.8s | 8.0s 0-180 verified: 32.6s | 26.5s Top speed claimed: 225 | 238 kph (Touring 235 kph) Top speed verified: 224 | 231 kph Verified weight*: 1520/1680 kg *My 2003 ZT-T 190 and 2002 525i Touring, full tank, 65 kg driver So the E39 Touring is 160kg/350lbs heavier, and according to specs, quicker (Touring can't weigh 180 kg more if 0-100 is just 0.4 seconds slower). Another example is 325Ci E46 (Zeperfs), also quicker, being a passenger heavier than the ZT. I'm curious about this mystery. Given the huge weight difference to the charts, have someone done a Racelogic test or dyno'd a stock 190? What were your results? Thank you, Ahrle |
10th July 2021, 20:38 | #2 |
I really should get out more.......
Rover 75 connoisseur se v6 auto Join Date: May 2014
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Short of the ZT 260 V8 - the 1.8t which was limited by BMW/MGR to 160 bhp to prevent outshining the 190/BMW sports saloons when reset to its original 200 BHP is the speediest.
Am sure a 190/V6 owner will come onto explain. Welcome to the club.
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10th July 2021, 21:47 | #3 |
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Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008
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I suggest you compare the gear ratios.
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10th July 2021, 22:05 | #4 |
I really should get out more.......
MG ZT V8, MGZT 135 derv ,MG TF 135 Join Date: Dec 2011
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I expect one or both vis motors are kaput which can certainly make the car feel sluggish.
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10th July 2021, 22:16 | #5 |
I really should get out more.......
75 tourer cdti, MG ZS 180, nissan terrano & 1.8t rover 25 Join Date: Feb 2010
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Don’t forget that the bmw is rear wheel drive, which is far superior in a standing race to x speed. That will likely be the reason for the quicker times. And as others have said, for the zt to not be reaching its stated times there is probably a vis motor dead. And finally, the tourer is heavier so you’d need to have the official specs for that, then compare. The extra weight of the bmw will help traction off the line
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How to view a car - everything you need to help you inspect a used car VIS motor tester avalible to local members Injector removal tool and auto gearbox pressure tester now available |
11th July 2021, 00:58 | #6 | |||
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Morris ZT-T 190+ Join Date: Jun 2021
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Thanks for the quick replies!
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Although one car might not say too much; my 190 tourer weighs in at 1520kg with driver, full tank and no spare wheel mod (bless or blame previous owners). Just 35kg heavier than claimed weight of the saloon. Yeah, thought of that. At Zeperfs, the ZT seems slower in 3rd, but quicker in 4th and 5th. ZT's top speed is lower too, so I guess it has lower gearing (may check in detail later). ZT's 0-100 dilemma seems partly caused by the theoretical 2nd gear top speed of 98 kph, meanwhile the 525i hits 101. But the ZT still doesn't catch up on 3rd; that's when it's really getting behind. Performance appears more equal to the 170hp 520i; also the Rover 75 2.5 will dust it at 180 kph. |
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11th July 2021, 02:06 | #7 |
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Morris ZT-T 190+ Join Date: Jun 2021
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Got a theoretical comparison of the ZT-T 2.5, 525i and 525i Touring, making the ZT-T justice as the dragstrip/0-140 kph winner.
Still curious why ZT-T has lower gearing/top speed, yet largely declining performance above 140 kph/80mph, though. Could it be the additional 500rpm needed for peak power? |
11th July 2021, 07:51 | #8 |
I really should get out more.......
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And if you wish to test your VIS motors you could use the freeware programme Toaf which is very handy, covers most things, and is easy to use, or borrow a simple tester from me. I generally have a few reconditioned "Stocktake" VIS motors here in Gävle, superior to standard ones and sold at cost on an exchange basis.
Regards Most welcome to say hello on here too ... https://www.facebook.com/groups/1800705170206717 |
11th July 2021, 09:06 | #9 |
Posted a thing or two
Rover 75 CDTi Saloon & Citroen C1 Join Date: Jun 2016
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The British horses are smaller ?
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11th July 2021, 20:41 | #10 |
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Hi Dave. I think he means that on paper? The Zt-t is slower. I don’t think he means that his car is slower than it should be. I think he compared the stats, and wondered why comparable output made the ZT-t slower. I may be wrong tho.
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