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I do not know if you found this page when looking for information so I will post it just in case.
Romfell Armored Car
There is some interesting reading on there about the armoured car.

Here is a direct link to a pdf with some information on the Romfell:
WFVaustriaHAUGH2.pdf
I tried to find the resource on the web page but could not.
This is the information from the pdf regarding the Romfell, found on pages 3 & 4 in case you do not want to download the pdf:

1915 Car, Armd, 4x2. Romfell Model 1915.
Remarks: One of the more armored car designs of
WWI, the Romfell was designed by Captain Romanic
and Lieutenant Fellner and constructed at the
Army depot in Budapest, and completed in August
of 1915. Despite its better than average armor placement
and fully rotating turret which allowed anti-aircraft
as well as ground fire, the Romfell was slow,
had restricted visibility and was pretty much restricted
to movement on improved roads.
Vehicle Data: Weight loaded, 15,400 lbs (6992 kg).
Length, 223 in (5670 mm). Width, 71 in (1800 mm).
Height, 98 in (2480 mm). Wheel Base, 150 in (3800
mm). Armor, .23 in (6 mm). NBC Protection, individual.
Armament: (1) 7.92 mm Schwarzlose Mod.
07/12 MMG. Elevation & traverse, manual. Fire
Control, optical. Aux wpns, crew sidearms. Capacity:
Fuel, gasoline. Ammo/Qty, 7.92 mm (3,000
rds). Crew, 4. Engine: Mercedes water-cooled gasoline
engine producing 95 hp (70 kW). Location,
front. Transmission: Manual. Suspension System:
Leaf spring. Wheels Steerable, front pair. No of
wheels, 4. General Data: Radio (wireless), Siemens
& Halske. Performance: Speed/Land, 16 mph (26
km/h). Range, 93 mi (150 km).Usage: One Romfell
Mod. 1915 was completed and used in Russia and
the Balkans by the Austro-Hungarian Army. Four
more modified vehicles were built in 1917. Manufacturer:
Austro-Hungarian Army Depot, Budapest, Hungary.

1917 Car, Armd, 4x2. Romfell Model 1917.
Remarks: At least one and probably as many as
three Model 1917 Romfell's were completed near
the end of WWI. One of the three used a chassis
with a 6-cylinder, 90 hp (67 kW) engine and the
other two Austro-Fiat truck chassis. The original
Romfell was designed by Captain Romanic and
Lieutenant Fellner and constructed at the Army
depot in Budapest, in August of 1915. The 1917
models had a slightly better speed and range
even using an engine with fewer horsepower.
This improvement was no doubt mostly due to
the drastic reduction in weight of almost four
tons.
Vehicle Data: Weight loaded, 7,700 lbs (3496
kg). Length, 223 in (5670 mm). Width, 71 in
(1800 mm). Height, 98 in (2480 mm). Ground
Clearance, 6 in (150 mm). Wheel Base, 140 in
(3550 mm). Armor, .24 in (6 mm). NBC Protection,
individual. Armament: (1) 7.92 mm
Schwarzlose M07/12 MMG. Elevation & traverse,
manual. Fire Control, optical. Capacity:
Fuel, gasoline. Ammo/Qty, 7.92 mm (3,000 rds).
Crew, 4. Engine: (1) 6-cylinder water-cooled
gasoline engine producing 90 hp (67 kW). Location,
front. Transmission: Manual with 4-fwd
and 1-rev gear. Suspension System: Leaf spring.
Wheels Steerable, front pair. No of wheels, 4
(duals at rear). Performance: Speed/Land, 22
mph (35 km/h). Range, 211 mi (340 km). Usage:
At least three Romfell Mod. 1917 were completed
and used as a mobile reserve and on the
Italian front by the Austro-Hungarian Army.
Manufacturer: Austro-Hungarian Army Depots.