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A broad overview of Datsun 1200 Performance

NOTE: Power ratings vary by country and year. Check the underhood plate in your 1200. Most plates have the SAE* rating (see below) of 68 or 69 hp.

Album 1947

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Datsun 1200 Performance

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Engine Ratings

Like all auto manufacturers, Nissan rated their HP at the engine using an engine dynamometer. Car manufacturers do not measure HP "at the wheels" (RWHP).

JAPAN B110 (source: 1971 B110 Parts Catalog C-173)
A12 
* 68 PS @ 6000 RPM
* 9.7 kg-m @ 3600 RPM
A12 GX
* 83 PS @ 6400 RPM
* 10.0 kg-m @ 4400 RPM

A12A JAPAN 1980 (H8500)
70PS @ 6000 RPM
0.12 torque

1972: 68 HP
Album 12226

1971: 69 HP
Album 9233

Factory dyno chart | A12 versus A10 | A12 shootout
Album 13935 Album 24403 Album 25733

year	engine	HP	rwhp	Kw	@rpm	torque (lb-ft)	N-m	@rpm	Notes
1971	A12	69	40	51	6000	70	97	3600	rear-wheel HP
	A12 used		25			30 (est)			Supertune Dyno
	A12 tuned		38			44 (est)			Supertune Dyno
1971	A12 USA	69		51	6000	70	97	3600	SAE Gross HP (?)
1972	A12 USA	68		51	6000	69	96	3600	SAE Net HP (?)
1972	A12GX	83		62	6400	72	100	4400	33 JIS hp rating
1973	A12SSS	90	55	67					rear-wheel HP
1973	Datsun Rotary	120		89	6500	116	160	4400	Wheels Magazine
1976	A14T	92			6400	11.7 kg-m		4400	1976 factory pub
1976	A14 FED	70		52					1976 USA ad, 4-speed
1976	A14 CAL	68		51					1976 USA ad, 4-speed
1980	A14	65		48	5600				US Wagon (from plate)
1980	A14 FED	80		60	6000				US model (from plate)
1974	A12GX	63		46.8	6224	60	83	3273	1200GXman
	A15 race	114		85	6965	90 (est)	124 (est)	6600	Steveo1000's A15
	A15 race	111		83	7900	86	118.938	5900	Steveo's A15
1997	A14	63		47	6000				B140 Review
2004-2006	A14	63		47	6000	70	97	2500	Nissan South Africa
	A14?		99						Dattoman_1000's engine
	A14+		104		7248				Rally1200's A
	A12 turbo		69						stock block turbo
	A15ETT		102	76rw					twin-turbo
	A15		69		5370 (est)				mild build-up

Post click for topic
Supertune 1200

RPM	RWHP Stock	Torque lb.ft. (est)	RWHP Tuned	Torque lb.ft. (est)
2000	10	26	14	37
2500	14	29	19	40
3000	17	30	24	42
3500	20	30	29	44
4000	23	30	32	42
4500	25	29	35	41
5000	22	23	38	40
5500	NA	NA	32	31

58kw (78 hp) @ 12:1 AFR
Album 13005

156 HP Dave Patten's A15 SCCA race engine

The 156HP pull was without the restrictor SCCA requires. The engine has around 15:1 compression and runs dual 45 Weber DCOE carbs w/32mm chokes.
The Low HP run was with the required 25mm restrictor, it was with a slightly cold engine and we were getting some pinging on that set-up. When we switched to the 24mm restrictor it was the 3&4 pulls with a more evenly warmed engine, no pinging and that netted the 142HP pull.

Dave Patten 1200

A15 74hp of NZ_datto
55.1kw @ 5982 rpm, 278 Nm @ 3800 rpm (74hp)

^POST 207 HP - Maximum A-series engine horsepower w/o forced induction
Start with an A15 block and bore it to 80 mm, stroke it to 88 mm for 1700cc total, re-engineer the cylinder head and rev it to 8500 RPM, then rebuild it after every race. Cost only about $20,000. See discussion: ^POST A15 engine - Whats the limit HP wise atmo roughly???
Album 26389

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Sunny Truck

A12 J-B121
最高出力      68 PS @ 6000 RPM
最大トルク 9.7 kg-m @ 3600 RPM
13001-H5000 installed straight up
9.0 Compression

A12 R-B122 
最高出力      52 PS @ 5400 RPM
最大トルク 8.5 kg-m @ 2800 RPM
13001-H5000 installed 3 degrees advanced
9.0 Compression

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Acceleration Performance

0-60 Comparison to Other Vehicles

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Comparison to Contemporary Vehicles

The Datsun 1200 was not slow in comparison with other economy cars of the period. For example, it was faster than all these cars in 0-60mph:

1973	Datsun 1200         16.5
1971	Chevrolet Vega 2300 16.5
1972	Dodge Colt Wagon    16.7
1976	Datsun B210 (4spd)  17.2
1976	Datsun B210 (5spd)  17.4
1976	Renault R-5         17.4
1972	Volkswagen Wagon    17.7
1974	AMC Gremlin         17.8
1975	Datsun B210         17.8
1974	Datsun B210 sedan   17.9
1979	Volkswagen Rabbit (Turbo Diesel) 17.9
1971	Ford Pinto 1600	    18
1976	Chevrolet Chevette Rallye 19.7

... Yet slower than these:

1974	Honda Civic         15.7
1980	Chevrolet Chevette  15.8
1972	Fiat 128 SL         16
1972	Ford Pinto Wagon    16
1972	Opel Wagon          16
1974	Toyota Corolla 1200 16.1

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Comparison to Modern Vehicles

What about the Modern Era? To bring the 1200 into the modern performance era, 0-60 times would have to be improved. These are among the slowest cars of the '90s (yet their 1/4 mile times are similar to the 1200's):

1993	Subaru Impreza L Wagon 12.7
1995	Geo Metro LSi          12.7
1990	Hyundai Excel GLS      12.5
1991	Toyota Previa LE       12.5
1996	Plymouth Breeze (auto) 12.5

reference: http://www.angelfire.com/pa3/ford/performance1.htm

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B210

A13 engine, 4-speed
0-60 mph 19.15 seconds
60-0 braking 156 feet
curb weight: 1915 lbs
F/R distribution: 54.3/45.7
Popular Science July 1974

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B310

USA Datsun B310 (210) 
A14 engine 
65 HP @ 5600 RPM
75 ft-lb @ 3600 RPM
Five-speed
curb weight: 1975 lbs
f/r weight distribution: 53/47
0-60 MPH: 18.0 seconds
60-0 braking: 196 ft
Popular Science February 1981

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Top Speed

Per the Datsun factory parts catalog C-231 top speeds are:

160 km/h GX
150 km/h 
145 kh/h AUTO
140 km/h VAN

I would guess the top speed is about 90 mph (144 kmh). The speedometer error in the Road & Track test vehicle was 7% off. It read out faster than the actual vehicle speed. This inflates speed, fuel mileage and distance traveled (if you go by the speedometer). My first 1200 speedo was off about 10%. My current speedo is off ~7.5%.

Top Speed: 90+ mph

Mechanix Illustrated 1973 article

The FIA docs states a top speed of 140 kph, and 150 kph for the high-compression engine.

To test the top-speed you need a long (5-mile) track or a banked oval. Mechanix Illustratedin 1973 tested a stock but broken-in 1200 on the Daytona Internationl Speedwayᵂ:

Quote:topping out at a shade over 90 mph

MOTORMAN magazine out of New Zealand tested both a regular 1200 and a 1200 SSS and note this:

Quote: We didn't take the 0-90mph time with the standard car because it was near the Datsun's top speed, but the SSS version took half a minute to reach this velocity, and continued to pull strongly to its maximum of 100mph.

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Braking Performance

The disc-brake Datsun 1200 had decent brakes:

FROM 60 MPH ... 160 feet ...
with some or all wheels locked ... 140 feet

Consumer Reports 1971 September Road Test

It had significantly better braking performance than the Datsun 510. It was similar to the 240Z (the 1200 beat the 240Z when fully loaded).

Stopping distance in feet from 60 mph: 190-195 feet

Album 256
USA 1971 Nissan Consumer Information document

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Braking Comparison with Period Cars

Compared to its time period, the 1200's brakes weren't necessarily bad:

disc-brake Datsun 1200: 190 ft
1964 Pontiac GTO: 197 ft
1970 LS-6 Chevelle: 194 ft

It was also better than the Fiat 850 and the same as the Opel Kadette.

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1973 Vehicle Stopping Distance

Source: 1973 Datsun Consumer Information

Stop from 60 mph
Light Load
* 179 ft 240-Z
* 176 ft 610
* 190 ft 610 Wagon
* 195 ft 1200
* 226 ft 510
Heavy Load
* 194 ft 240-Z
* 200 ft 610
* 216 ft 610 Wagon
* 190 ft 1200
* 196 ft 510

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Braking Comparison with Modern Cars

The braking performance doesn't compare well with todays vehicles:

disc-brake Datsun 1200: 190 ft
2002 Mitsu Lancer: 144 ft
2002 Toyota Camry: 118 ft

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Weight

Main: Weight

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Fuel Economy

Main: Fuel_economy

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Aerodynamics

Datsun 1200 has a coefficient of aerodynamic Drag (Cd) of 0.42, which is typical of most cars before the 1980s.

Main: Aerodynamics

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General Information

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How much horsepower does my engine have?

Engine ratings can vary from the engine in your car:

Different countries, different ratings
Different emissions controls, camshafts and other parts
Production tolerances. Your engine might have a little more or a little less than advertised
Manufacturer reports may not have been accurate
Ratings prior to 1971 cannot be compared directly to newer ratings (to get a ballpark comparison, subtract 20% from the gross rating)

The best way to measure your engine is to put it on a dynamometerᵂ. Use the same air cleaner and exhaust and all accessories, or use a correction factor to estimate the Net hp from the Gross hp.

Hp can also be estimated from top speed (if a lot of other things are known, like the aerodynamic numbers or the car), or from 1/4 mile drag race elapsed time.

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Horsepower Ratings Standards

Note that engines are not rated by independent testers -- it's the manufacturer's word. They are supposed to follow a standard though, or they could be held liable for false advertising.

PS - DIN HP, derived from the German word Pferdestärke (literally, "Horsepower"). This is net metric HP. This is slightly higher numbers than SAE (for the same engine. 70 DIN = 69 SAE). DIN tested the engine fitted with all ancillaries and exhaust system as used in the car
BHP - brake horsepower, the HP measured from the engine crankshaft
Japan: In Japan, the DIN standard was used, now using JIS
Europe: The DIN rating was used in Europe
US: In United States, SAE ratings were without alternator, water pump, and other auxiliary components (Gross HP, see below). Later NET HP was measured by SAE standards
Metric: Since 1972, Kw is used. 69 hp = 51 kw

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What is horsepower?

Horsepower is a measurement of the engine's ability to perform work. For example, the work of accelerating a car through a 1/4 track.

Note that the horsepower "number" is independent of weight. It is simply the measure of work over time.

Horsepower is a computed factor based on the torque measured on an engine dynomometer. Torque is just the force of the engine, but doesn't say how much work is getting done. Horsepower is the work made possible by the rotating engine, so RPM is also a factor along with the torque in determining power.

The HP "rating" is a static setting for a certain condition (like full throttle, maximum engine load at a certain RPM) and so only tells a little bit about the engine. An engine performance curve, generated by by taking torque readings at a sequence of RPMs, will give more insight into the performance of a car.

For a detailed discussion of horsepower and torque and how they relate to cars, see Vettenet's Torque and Horsepower Primer

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Power and Top Speed

It takes a certain amount of power to push a particular car through the air due to aerodyamics, and friction of the tires agains the road. For a Datsun 1200 coupe or sedan, it takes about 35 rear-wheel-horsepower to push the car along at 90mph (140 kph).

This means that in order to go faster your can increase the engine HP — or improve the aerodynamics — or reduce tyre friction.

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Torque and HP conversions

Nm = ft. lbs. * 1.38273

SAE HP = kW * 1.341

Torque = Horsepower x 5252 / RPM

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What is SAE?

SAE is the Society of Automotive Engineers. Their standard is used by the auto manufacturers. Prior to about 1972, SAE gross ratings (aka bhp — brake horespower) was used. This was the engine without accessories and was was not standardized, so different manufacturers rated it differently. Since 1972 in America the Net SAE rating has been used per standard J1349. This is the engine with all accessories (alternator, air cleaner, etc) as fitted in the car, so it is more realistic. Both SAE net and gross ratings are based on an engine dynamometer (not a rear-wheel dyno). The "brake" is referring to the dyno's putting a retarding force on the engine.

SAE NET HP is more powerful than Gross HP. So be cautious about comparing old advertised HP ratings to modern advertised ratings.

In 2005, the SAE introduced "SAE Certified Power" with SAE J2723. To attain certification the test must follow the SAE standard in question, take place in a ISO9000/9002 certified facility and be witnessed by an SAE approved third party. A few manufacturers such switched to the new ratings immediately, which raised the HP for some engines, but fell for most.

To Recap:

SAE Gross HP - used by american auto manufacturers prior to 1972, HP at flywheel without engine accessories (unrealistic)
SAE NET HP - used from 1972, which is actual HP at flywheel as fitted in the car (realistic)
SAE Certified HP - used by some since 2005 (accurate)

For more details, see wikipedia:Horspower in the section Society of Automotive Engineers.

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Rear Wheel Horsepower

With rear-wheel HP there are standards sometimes used, but the "chassis" dynos which measure rwhp are notoriously uncalibrated. So comparing rwhp figures is to be taken with a grain of salt.

If the horsepower is measured according to certain standards, then it tells you something about how the HP number was arrived at. For a long time, new car manufacturers have been using JIS, DIN or SAE measurements to ensure the number is accurate even on different engine dynos. For 2007, a new improved SAE standard is making the measurement even more precise. A lot of engines were de-rated about 5 HP (e.g. Honda) while Fords were generally unchanged and a few even were uprated a touch.

This means you can generally have good faith in new-car manufacturer's power number (as least in USA where the new standard is used).

When measuring rwhp, the dyno operator needs to factor in an appropriate loading weight for the dyno rollers. If done correctly, the resulting HP number should theoretically stand alone, independent of weight.

Another way to look at it, theoretically 200 HP is 200 HP, whether put out by a turbine engine, rotary engine or piston engine. Or even an electric motor. Yet as others pointed it, the HP alone doesn't tell you how fast a car will accelerate. For that you need other factors, especially weight (lighter cars accelerate faster than heavy cars with the same engine). And then suspension setup has a huge effect on the first 60 feet of acceleration (cars that spin the tires too much accelerate slower, all else being equal). For top speed, HP alone is a good indicator, while the "power band" (average hp over a wide RPM range) affects acceleration: for example a supercharged engine which typically makes high power at low, medium and higher RPM will out-accelerate a modified engine of the same size -- even when both make the same peak HP (this is because modified non-turbo/non-blower engines make little HP at low RPM).

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Size Comparison

Size is not a performance item, but it is the single most important factor for weight, which is directly related to performance. Less weight = Faster acceleration. Top speed also decreases due to aerodynamic dragᵂ in the form of area.

Overall Length (Coupe, USA models)

Smart Fortwoᵂ: 2499 mm, 98 in (8' 2")
Mini Hatchᵂ: 3630 mm, 143 in (11'9")
Mini Hatch: 3700 mm, 148 in (12'4") (2007 model)
B110: 3825 mm, 150 in (12'6")
B210: 4065 mm, 160 in (13'4")
B310: 4190 mm, 165 in (13'9")

Overall Width: (Coupe, USA models)

Fortwo: 1514 mm, 59.6 in (5'0")
B110: 1515 mm, 59.6 in (5'0")
B210: 1545 mm, 60.8 in (5'1")
B310: 1580 mm, 62.2 in (5'2")
Mini: 1690 mm, 66.5 in (5'6")

Retrieved from "http://datsun1200.com/modules/mediawiki/index.php?title=Performance"

Performance

Current revision

Contents

Datsun 1200 Performance

Engine Ratings

Sunny Truck

Acceleration Performance

0-60 Comparison to Other Vehicles

Comparison to Contemporary Vehicles

Comparison to Modern Vehicles

B210

B310

Top Speed

Braking Performance

Braking Comparison with Period Cars

1973 Vehicle Stopping Distance

Braking Comparison with Modern Cars

Weight

Fuel Economy

Aerodynamics

General Information

How much horsepower does my engine have?

Horsepower Ratings Standards

What is horsepower?

Power and Top Speed

Torque and HP conversions

What is SAE?

Rear Wheel Horsepower

Size Comparison