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MG ZR ZS ZT Technical - 5000rpm in 5th

Now I know what speed my ZS180 does in 5th at 5000rpm. Two and a half inches past the legal speed limit on the speedo. Great fun roaring up the A1 north bound from the A14 saturday evening. Quite often do 4-4500 revs, but wondered how fast it goes at 5000.
Jeff Patterson

Was that on the 4 lane bit?
Kelvin

in the 260 this would be escape velocity!!
Neil

Jeff,

If you have the gearbox & tyre spec, you can work it out.......one of the sites with the calc. on is www//race-technology.com.......their utilities page has all this info, plus gearchange speeds.


Mike
Michael barnfather

Kevin
Yep it was the 4 lane bit.
Michael
I know what speed it does at 5000rpm don't need to work it out
Jeff Patterson

Jeff, did you subtract the inbuilt error margin of say 10% !, I have yet to find a speedo that does not give exaggerated speeds the faster you go !, a decent GPS would give you a more accurate figure .
Mike
Mike (Mersea Office)

23.2mph per 1000rpm so assuming accuracy of tacho (usually reasonably accurate and ignoring minor variation for tyre size and growth as spoeed rises and your looking at 116mph. The car is slightly over geared so that maximum speed is achieved approx 500rpm under maximum power point, this is done to aid economy without hurting acceleration too much, and also to enable the ZS to feature a top speed under that of the ZT190 for marketing reasons.

Rog
Roger Parker

Now lads your getting to technical for me.
Roger
The speedo was about 115-120 ish, not perfect I know, but it will do for me. The car was saynig to me, 'go on more more' and I was going to go for it, but, as ever the careful driver got in the way. Oh hum, good fun though going up the A1 with a big grin on.
Jeff
Jeff Patterson

In 1966 ,in the afternoon,driving a 911 I (legally) accompanied an Alfa 2600 for 50 miles down the M1 at speeds of between 100 and 120 mph
Those were the days!
andrew

SO what is 5000rpm in 5th in the Zt260 ?

I dont intend to test it by the way it could be 150-160 ish?
Neil

the speedo on the ZS180 is particularly accurate - checked mine against GPS and always only 1 or 2 mph out right up to about 130, never had it beyond that either on track or abroad.
David

Very approx bhp and top speed are following
mph bhp
140 176
150 215
160 258
170 307

Paul
Paul

So 160ish

that'll do!

Neil

The 260 is limited to 155mph.

Tony
Tony

ZT with 29.7mph per 1000rpm gives a theoretical max of 178.2mph @ 6000rpm, but to achieve that speed would require 400bhp to be produced at that rpm, and a small modification to eliminate the speed limiter! Interestingly a ZT-T needs 415bhp to achieve the same.

Rog
Roger Parker

so the supercharger as used by Dreadnought and the "small modification" gives you 178.2mph!

That'll do!!!!

Neil

About 5-7 mpg so you will need to take a credit card.
Paul

......and a suitcase of clothes for your night at the Police station.
george

sound like fun ...a bit of risk involved

Neil

This thread was discussed between 08/11/2004 and 16/11/2004

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