2010 Opel Insignia OPC – Tampa Bay sports car | Examiner.com

6 Sep 2014 | Author: | Comments Off on 2010 Opel Insignia OPC – Tampa Bay sports car | Examiner.com
Opel Insignia

2010 Opel Insignia OPC

April 18, 2009

There is a new Opel in town, and it’s already becoming an insignia. The Opel Insignia OPC is GM’s newest attack against the Audi S-4. Is it better? I think so.

Let me formally introduce you to the twins, 2010 Opel Insignia OPC and 2010 Vauxhall Insignia VXR. These two vehicles feature a turbo, all wheel drive sedan with performance to spare. Let’s check out the 2010 Opel Insignia OPC specifications.

2.8 V6

325 hp

295 ft-lb

0-60 in 5.8 seconds

Micro-alloy forged steel crank

Diecast alloy oil sump

Twin scroll turbocharger

Variable valve control

6 speed manual

Electronic limited slip differential

Opel Insignia

Brembo brakes

This new Opel is one bad mother. Inspired by rally designs and Opel/Vauxhall’s rich rally cross history, this new model is sure to be a favorite for modifications. Surprisingly, the motor is not a two liter rally derived engine. There aren’t many aftermarket parts available for the Insignia, but expect that to change quickly. Most aftermarket parts could be retro fit to this vehicle.

The twin scroll turbo charger design in combination with a variable valve will make for an extremely low amount of boost lag.

What is a twin scroll turbo?

A twin scroll turbine housing uses dual side by side passages into the housing. When coupled with a pulse converter manifold that separates exhaust pulses as many crank degrees in the firing order as possible, a twin scroll or divided housing works to reduce lag, decrease exhaust manifold backpressure on the top end, reduce the potential for reversion, and increase fuel economy.

The twin scroll is based off the same reasoning a tri-Y header uses: keep spent exhaust gases out of an adjacent cylinder drawing in fresh air. At high rpm on a turbo car, exhaust backpressure is usually significantly higher than atmospheric pressure, and often higher than intake manifold pressure as well. A divider between each of the two volutes allows the cylinders to expel the exhaust gases without it interfering with the fresh air for combustion.

Since there are two openings, each a smaller overall volume than a single scroll design, the exhaust velocity of each pulse can be maintained.

This also spins the impeller more easily because lag is a function of the scroll area. A single turbine housing opening isn’t as efficient since cylinders on the exhaust stroke of the 4 stroke cycle contaminate the cylinders that are on overlap with exhaust gas. A conventional turbine housing is not as effective in using exhaust pulse energy to help spin the turbine up to speed as it does not exploit the energy contained in the pulses as well. – Twin scroll turbo for dummies!

Want to check out this vehicle? It will be on display for Opel’s 10 year anniversary at the Barcelona Motor Show on May 7th, 2009. For most of us, video content will have to do. Check it out yo!

Opel Insignia
Opel Insignia
Opel Insignia
Opel Insignia
Opel Insignia
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