Countach Downdraft 1985 to 1988.5

Even that is not enough to have enough power at that rpm's to cope with the air drag.

 

Why is this in the dd section?

 

Dd speedo optimistic?

 

Because the Rosberg men like Euro spec lambos.....

 

I am confused... According to the Guru himself... A QV downdraft is capable of going 195mph ( even though in the only real instrumented tests it achieved 166mph and 179mph ) yet you are telling me that a carbon fiber Countach weighing approx 600lbs less, with better aerodynamics, and more power could only achieve the same speed.
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Valentino also said that in their testing the QV FI made more power in low and mid range than the DD..............

Dont forget about the last ingredient in the Pierluigi Martini's 195.2 run... a stop watch and kilometer posts.

 

Cesare Lodi (other famous lambo test driver) told me some years ago they found a 295 Kmh top speed on carburated quattrovalvole
he told they achieved this top speed wingless and with folded mirrors


if you ask me .... still a good terminal speed for a car that is not exactly perfectly shaped for optimal CX

 

i am talking of "real" tested top speed
not Jaeger speedometer

 

unfortunately we did not discuss the top speed of the FI QV
they probably tested it to at Nardò.
would have been interesting to compare

 

Cesare is a liar.. All DD's can go ATLEAST 195mph...

 

he looked like a honest guy to me
very kind and willing to share with lamborghini owners-fans

i seem to remember (it was 10 years ago i think...) factory hoped to get a 300 Kmh top speed and so they folded the mirrors to get the so important "extra" 1 kmh

i think the claimed quattrovalvole top speed was also a very correct 295 Kmh, after the optimistic 300...315... claimed by lambo factory for older countach and miura, lamborghini finally claimed much more realistic performance values


the anniversary carbed countach was tested by few italian magazine in period and top speed number was also very similar...i think 290-299 Kmh depending on single tests
the anniversary could be "slightly" better for CX than the QV, but is bit heavier
also the gearing is slightly different

still the performance of a carbed QV vs carbed 25th were pretty close i think

 

Did not know they where made other places than Italy, please explain

 

For top Speed the weight is completely irrelvant, only two things are significantly relevant, aerodynamics and power, these is a simpy physical law, there are formulas which can be used to calculate how much additional hp you need to get slightly faster. You would be sureprised what it needs to get only 5kmh or miles faster.

quick caluclation, AMS tested the QV with 298kmh at 7400rpm, theoretically with 8000rpm it would run 322kmh which is exactly 200 miles, 195 miles=313kmh.
The Diablo with at least 492hp but much better aerodynamics achieved 320kmh, means a QV needs significantly more then 500hp to get near this. The more than 500hp not at 7000rpm like the factory claimed, no at 8000rpm!
Consider the power curve of the QV engine and stop your guesses.

 

Great post! Simple physical laws are not simple enough for some...

 

i know, weight helps only arriving at top "quicker" ...that is all that matter in real life
with the weight i was considering the difference in all performance QV vs anniversary (meaning the differnce in acceleration test also)

90% of diablos 2wd were tested at 325 Kmh + top speed

 

Fastest recorded Countach. Al Burtoni's. 202 mph & very highly modified.
Al Burtoni in the United States created a Countach based race car, based on a 'normal' Countach QuattroValvole with chassis # 112.1002, this 5.2 Litre engined car could go up to 202 Mph at the Bonneville Salt Flats race track.

This speed was partly obtained due to the massive, deep front spoiler added by Mr Burtoni himself, also special chrome finished wheels were fitted coupled to a lower race type, adjustable suspension. The exterior rear view mirrors were removed but the adjustable rear spoiler remained installed.

Also note that the entire body was 'cleaned', the wheel arch extensions were removed and a new 'widebody' was mounted, special discs were mounted on the wheels to make them less intrusive on the very smooth airflow over this Countach.

Also note the 'high downforce' double wing rear aerofoil, the only item that truly interupts the otherwise very clean lines on this record breaking Lamborghini.

The late Jim Fueling (March 11. 1945 - December 6. 2002) actually drove this unique 5.2 Liter QuattroValvole Countach to a top speed of 201.793 Mph, a record for 'C' modified sports cars that was only recently broken after holding up for over ten years. Today this Hot Rod is making some public appearances at some of the most exotic car shows throughout the United States.

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I don't know if it is carbed (my guess is yes) or fi, but if a stock dd could belt out 195 mph, then Al sure went to A LOT of trouble searching for that extra 7 mph.

 

Many variables to top speed testing. Temp.. D/A level... track conditions can have an upward or downhill slope, tire pressure etc. Not to mention there are easy tricks to pickup a mph or two ie removing the windshield wiper, the mirrors, strategically placed tape etc.

Knowing a winged DD in the Car and Driver managed 166mph, and a wingless DD in Road and Track managed 179mph, inmo the Top speed lay between those two numbers depending on conditions. Anyone who thinks a blueprinted motor with an additional 15hp (claimed) will get you to 195mph must also believe in Santa Claus.

 

Weight plays a part in several ways, one of which is slowing acceleration which requires a longer distance to hit theoretical top speed.

 

This car had a highly modified engine, beginning with his high compression Pistons, different cams, blueprinted engine, race exhaust, MSD ignition and was for sure having significantly more than 500 hp at the crank and as well at the right rpm's to achieve that Speed.
http://www.alburtoni.com/V12engpl.pdf

But that was not 1002, that's the first LP400S delivered to Walter Wolf, don't know the VIN of Al's record car.
http://www.alburtoni.com/oneoffs/indexoneoff.htm

Coming back to the Downdrafts, GLA12997 has Sport cams, we increased flow additionally with optimizing the valves, I could Keep up to a certain Speed with the Diablos, but at 280kmh it got slower, it would never make more than 300kmh but I could never try till the end.

 

I think it's wrongly written here: http://www.lambocars.com/countach/countach_record_car_by_al_burtoni.html

A regular QV would never had such a VIN.

 

Clearly a Downdraft: http://www.lambocars.com/images/countach/0/countr2.html

 

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