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MG ZR ZS ZT Technical - Seen 146 mph ZS180

On XPower Forums - speedo reading 146 mph! WOW, I want one!
George Hunt

The car or the computer that faked the photo?
Mike MEGA

146 - the speedo error sounds about right to me.

more interesting is the 4 races i have had with Civic R's in my ZS180, 2 kills and 2 draws.
I find they dont live up to the billing as the "ultimate" hot hatch as they suffer from a lack of mid range grunt that the ZS180 has plenty of.

care to comment mike?
Peter Hitchens

Peter
We are looking at WW3, War that could kill thousands, tens may be hundreds of thousands of lives..........and you want to talk about the F*cking ZS!

Er i think you find that Honda "R" is very mileage sensative. Young cars are a bit tight, mine is now up to 3,000 miles but still no where like as quick as a 12,000 miler i drove on saturday.

Peter, what do you think, are we going for Sadam or Oil?
Mega
Mike MEGA

Car has been recently rolling roaded and speedo is as near as dammit. Also don't forget standard book spec is 139, so not much to ask for 7 mph is it ;-)
mike

I'm with Peter

A rolling road isn't accurate enough. Probably the Speedo and the RR had the same errors! Anyway, it will be the first production car Speedo I've ever known that's factory calibrated correctly!

For example I checked my TF 160 Speedo against a GPS with the following results:

Speedo GPS accuracy
90 85.5 95.00%
80 75.0 93.75%
70 65.6 93.71%
60 56.5 94.17%
50 47.2 94.40%

Thus Speedo is reading -5.8%, applying correction factor to above 147mph gives a top speed of 138.47 remarkably close to MGR's spec of 139mph.... Given the right level road and favourable weather conditions I guess meeting MGR's spec is possible. Which incidentally is spec’d at 6000rpm at which point the engine power and wind resistance/drag/system losses are in equilibrium.

To go any faster would need some assistance; a reasonable incline for example. With no resistances the car would reach a theoretical max of 151mph (6500rpm [max power]* 23.2mph/1000rpm).

For an 'incline' try the Bealach na Ba road from Applecross to Tornapress in Scotland…. I tried to find out a Mountain Bike’s terminal velocity on that road once…. Only just survived to tell the tale.

Ian
Ian Walker

'We are looking at WW3, War that could kill thousands, tens may be hundreds of thousands of lives..........and you want to talk about the F*cking ZS!'

Correction, MUGGYBrain - you may be talking about WW3, but don't assume that everyone else on this 'MG' bbs wants to too.
David Beckham

Mega calm down. At least you dont have to go out to the Gulf next week. You will be sitting safe in old Blighty. Second thoughts you live in Liverpool, think I might just be better off in the Gulf (fingers crossed anyway).

Mike
ProMGR

Send Mega to the Gulf ?
WW3 might be worth it, if it can free us from
Saddam..........and Mega
Doug B

Just 25 bhp on top of the standard 175 will achieve a calculated 145.3mph, subject to gearing am power band being matched to that speed. IOW a quite realistic target which could be achieved with some engine work. I personally don't want to rip my engine to pices yet.

Rog
Roger Parker

This thread was discussed between 05/09/2002 and 07/09/2002

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