Road Tests Real world tests of Ultima GTR vs Radical SR8

Top speed

Ultima GTR
234 mph
179 mph

Differences What are the advantages of each

Side view of Ultima GTR

Reasons to consider the
Ultima GTR

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Faster top speed 234 mph vs 179 mph 55 more mph; leaves lesser cars in the dust on the straights
Way more more powerful engine 710 HP @ 5,600 RPM vs 449 HP @ 10,500 RPM Around 60% stronger engine
Much bigger engine 6,400 cc vs 2,800 cc More than 2.2x bigger engine
Side view of Radical SR8

Reasons to consider the
Radical SR8LM

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Lighter curb weight 1,430 lb vs 2,310 lb Around 40% lighter curb weight; less inertia to overcome when accelerating

Specifications Full list of technical specs


Ultima GTR  vs
Radical SR8 
Brand Ultima Radical
Price 150,000 180,000
Year 2000 2007

power & handling

Power-to-weight ratio 3.25 lb/hp 3.18 lb/hp
Maximum hp 710 HP @ 5,600 RPM 449 HP @ 10,500 RPM
Engine placement Mid Mid
Steering system Rack and pinion Rack and pinion

suspension, wheels & brakes

Front brakes Disc Disc
Rear brakes Disc Disc
Front wheels 457/? 229 381/? 178
Rear wheels 457/? 343 406/? 203

road tests

Ultima GTR  vs
Radical SR8 
Top speed 234 mph 179 mph


Drivetrain Mid Engine / RWD RWD w/Quaife RQ2 Differntial
Gearing Traditional Traditional


Displacement 6,400 cc 2,800 cc
Cylinders V8 V8
Compression ratio 10:1 11:1
Bore/stroke 3.9 in / 3.62 in 3.19 in / 2.48 in

physical dimensions

Curb weight 2,310 lb 1,430 lb
Width 72.8 in 70.9 in
Length 157.5 in 159.4 in
Ultima GTR
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Radical SR8LM
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