If you’re into cars and know a thing or two about them and their engines, you probably also know that naturally aspirated units can’t be easily tuned to make more horsepower. Funnily enough, we had Steve Dinan tell us why that is, a while back.
We said it was funny because the car we’re about to show you was tuned by his company. We’re talking about an E60 BMW M5 that is now developing 630 HP, and no, it’s not using a supercharger or a turbo to do so. Instead, the owner decided to maintain the razor-sharp pedal response of his car and improve the specs by going another route.
He bought a Dinan high-performance stroker kit for his 5-liter V10 S85 engine that took the displacement up to 5.8 liters. The bored and stroked unit also comes with a new intake and a bigger exhaust.
The bore increased to 94 mm from 92 mm while the stroke went up to 83 mm from the standard 75.2 mm. The compression ratio was kept at 12.0:1. To handle the new specs a Dinan forged crankshaft was needed, as well as lightweight forged pistons, connecting rods, electronics and engine management software. With all of this and the aforementioned intake and exhaust, the power should go up from 507 HP and 520 Nm (384 lb-ft) of torque to around 610 HP and 634 Nm (468 lb-ft) of torque, which is a mighty good improvement over what the M engineers offered.
Chip in some mid-section exhaust parts and under drive pulleys and Dinan will take your M5 up to 630 HP, as this owner claims he has. With those specs, according to the American tuner, the sedan can go from zero to 60 mph (97 km/h) in 3.8 seconds and cover the 1/4 mile in 11.9 seconds.
The problem is, all of this is rather expensive. The engine stroker kit costs $39,999 alone, and if you’re to chip in the man hours and exhaust, you get pretty darn close to $50,000. This is a sum not a lot of people are willing to spend.
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