My GX coupe without the GX head and twin carb set up despite blowing out blue smoke can easily reach an indicated 160kph. Still pulling but the tired engine gets very noisy so I backed off.

I used to have the KPB210 alloy wheels but the car was totaled and the wheels got stolen.

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Sad ending for such a nice car and beauty wheels

Yes, any A12 should be able to do 140kph. Mainly needs correct timing and mixture and small tires to get the revs past 5000 rpm. Even the stock Hitachi carb can do it. But you need a long road to get it up to speed

Hey SharmCos I bought it from Revhead a few years back.

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What size tyres were you running on those rims?

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Oh ok. I sold one to South Australia last year.

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Sorry I don't remember. Probably 165/70/13.

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Yeah that totaled red 120Y managed an indicated 150kph (a little over 150 according to a GPS reading). Engine totally stock bar a K&N filter, 4-speed box and 14-inch wheels, standard ride height. Quite scary!

Hey ddgonzal do dynos count as rolling road if they do i had the 1300 coupe sitting on 190kph at 7800rpm in4th in a matter of secons😆😆
PS hope the new motor goes harder
Should know in late January.

yes a chassis dyno is called a rolling road

To get an old A12 up to it's potential it's important to have:
* Good spark (correctly set dwell/gap)
* Correct timing (34 degrees BTDC)
* Gearing to match top speed with max power RPM (6000 rpm)


More information: stock Datsun 1200 sedan/coupe top speed was 145 to 150kph, confirmed by magazine tests. Not bad for 69 flywheel HP (~40 rear wheel HP)

A chassis/wheel dyno can be loaded to simulate wind resistance which is the limiting top-speed factor for the Datsun 1200. At 150 kph, it takes every bit of HP the stock A12 outputs to just barely push the car through the wind. That means a stock A12 must be outputting top HP -- which occurs at 6,000 RPM. Hence small tires or steep gearing are needed. Five speeds won't help with top speed. VB110 has 10kph lower top speed partially due to less aerodynamics and partially due to over-steep gearing (hitting max HP RPM too soon and then the wagon can't go faster because engine HP is going down as you rev past 6000 RPM)

Wind resistance is squared with speed e.g. There is 4 times the aerodynamic drag when you go 2x the speed

Tuning your car to best feel will not make the most HP, if the feel at low speeds is what is aimed for. For example overadvancing the timing can pick up some acceleration but it will slow down when revved high enough. With careful recurving of the distributor you can get both, but even without that a stock distributor can be used to go 140/150 kph

I think you need a more modern magazine test as the imfo you just wrote is not really relavent to a lot of Aseries RACE motors which are putting out more than triple the HP at higher RPMs.and dont need a long road to get to high speeds